Con Kolivas [Fri, 9 Dec 2016 04:15:57 +0000 (15:15 +1100)]
ALSA: usb-audio: Add QuickCam Communicate Deluxe/S7500 to volume_control_quirks
commit
82ffb6fc637150b279f49e174166d2aa3853eaf4 upstream.
The Logitech QuickCam Communicate Deluxe/S7500 microphone fails with the
following warning.
[ 6.778995] usb 2-1.2.2.2: Warning! Unlikely big volume range (=3072),
cval->res is probably wrong.
[ 6.778996] usb 2-1.2.2.2: [5] FU [Mic Capture Volume] ch = 1, val =
4608/7680/1
Adding it to the list of devices in volume_control_quirks makes it work
properly, fixing related typo.
Signed-off-by: Con Kolivas <kernel@kolivas.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Takashi Iwai [Sun, 9 Apr 2017 08:41:27 +0000 (10:41 +0200)]
ALSA: seq: Don't break snd_use_lock_sync() loop by timeout
commit
4e7655fd4f47c23e5249ea260dc802f909a64611 upstream.
The snd_use_lock_sync() (thus its implementation
snd_use_lock_sync_helper()) has the 5 seconds timeout to break out of
the sync loop. It was introduced from the beginning, just to be
"safer", in terms of avoiding the stupid bugs.
However, as Ben Hutchings suggested, this timeout rather introduces a
potential leak or use-after-free that was apparently fixed by the
commit
2d7d54002e39 ("ALSA: seq: Fix race during FIFO resize"):
for example, snd_seq_fifo_event_in() -> snd_seq_event_dup() ->
copy_from_user() could block for a long time, and snd_use_lock_sync()
goes timeout and still leaves the cell at releasing the pool.
For fixing such a problem, we remove the break by the timeout while
still keeping the warning.
Suggested-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Takashi Iwai [Fri, 24 Mar 2017 16:07:57 +0000 (17:07 +0100)]
ALSA: seq: Fix race during FIFO resize
commit
2d7d54002e396c180db0c800c1046f0a3c471597 upstream.
When a new event is queued while processing to resize the FIFO in
snd_seq_fifo_clear(), it may lead to a use-after-free, as the old pool
that is being queued gets removed. For avoiding this race, we need to
close the pool to be deleted and sync its usage before actually
deleting it.
The issue was spotted by syzkaller.
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Takashi Iwai [Tue, 21 Mar 2017 12:56:04 +0000 (13:56 +0100)]
ALSA: seq: Fix racy cell insertions during snd_seq_pool_done()
commit
c520ff3d03f0b5db7146d9beed6373ad5d2a5e0e upstream.
When snd_seq_pool_done() is called, it marks the closing flag to
refuse the further cell insertions. But snd_seq_pool_done() itself
doesn't clear the cells but just waits until all cells are cleared by
the caller side. That is, it's racy, and this leads to the endless
stall as syzkaller spotted.
This patch addresses the racy by splitting the setup of pool->closing
flag out of snd_seq_pool_done(), and calling it properly before
snd_seq_pool_done().
BugLink: http://lkml.kernel.org/r/CACT4Y+aqqy8bZA1fFieifNxR2fAfFQQABcBHj801+u5ePV0URw@mail.gmail.com
Reported-and-tested-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Takashi Iwai [Tue, 28 Feb 2017 21:15:51 +0000 (22:15 +0100)]
ALSA: seq: Fix link corruption by event error handling
commit
f3ac9f737603da80c2da3e84b89e74429836bb6d upstream.
The sequencer FIFO management has a bug that may lead to a corruption
(shortage) of the cell linked list. When a sequencer client faces an
error at the event delivery, it tries to put back the dequeued cell.
When the first queue was put back, this forgot the tail pointer
tracking, and the link will be screwed up.
Although there is no memory corruption, the sequencer client may stall
forever at exit while flushing the pending FIFO cells in
snd_seq_pool_done(), as spotted by syzkaller.
This patch addresses the missing tail pointer tracking at
snd_seq_fifo_cell_putback(). Also the patch makes sure to clear the
cell->enxt pointer at snd_seq_fifo_event_in() for avoiding a similar
mess-up of the FIFO linked list.
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Takashi Iwai [Tue, 28 Feb 2017 13:49:07 +0000 (14:49 +0100)]
ALSA: timer: Reject user params with too small ticks
commit
71321eb3f2d0df4e6c327e0b936eec4458a12054 upstream.
When a user sets a too small ticks with a fine-grained timer like
hrtimer, the kernel tries to fire up the timer irq too frequently.
This may lead to the condensed locks, eventually the kernel spinlock
lockup with warnings.
For avoiding such a situation, we define a lower limit of the
resolution, namely 1ms. When the user passes a too small tick value
that results in less than that, the kernel returns -EINVAL now.
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Takashi Iwai [Mon, 6 Feb 2017 14:09:48 +0000 (15:09 +0100)]
ALSA: seq: Don't handle loop timeout at snd_seq_pool_done()
commit
37a7ea4a9b81f6a864c10a7cb0b96458df5310a3 upstream.
snd_seq_pool_done() syncs with closing of all opened threads, but it
aborts the wait loop with a timeout, and proceeds to the release
resource even if not all threads have been closed. The timeout was 5
seconds, and if you run a crazy stuff, it can exceed easily, and may
result in the access of the invalid memory address -- this is what
syzkaller detected in a bug report.
As a fix, let the code graduate from naiveness, simply remove the loop
timeout.
BugLink: http://lkml.kernel.org/r/CACT4Y+YdhDV2H5LLzDTJDVF-qiYHUHhtRaW4rbb4gUhTCQB81w@mail.gmail.com
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Takashi Iwai [Wed, 8 Feb 2017 11:35:39 +0000 (12:35 +0100)]
ALSA: seq: Fix race at creating a queue
commit
4842e98f26dd80be3623c4714a244ba52ea096a8 upstream.
When a sequencer queue is created in snd_seq_queue_alloc(),it adds the
new queue element to the public list before referencing it. Thus the
queue might be deleted before the call of snd_seq_queue_use(), and it
results in the use-after-free error, as spotted by syzkaller.
The fix is to reference the queue object at the right time.
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Takashi Iwai [Tue, 6 Dec 2016 15:20:36 +0000 (16:20 +0100)]
ALSA: hda - Fix up GPIO for ASUS ROG Ranger
commit
85bcf96caba8b4a7c0805555638629ba3c67ea0c upstream.
ASUS ROG Ranger VIII with ALC1150 codec requires the extra GPIO pin to
up for the front panel. Just use the existing fixup for setting up
the GPIO pins.
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=189411
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Marc Kleine-Budde [Thu, 2 Mar 2017 11:03:40 +0000 (12:03 +0100)]
can: usb_8dev: Fix memory leak of priv->cmd_msg_buffer
commit
7c42631376306fb3f34d51fda546b50a9b6dd6ec upstream.
The priv->cmd_msg_buffer is allocated in the probe function, but never
kfree()ed. This patch converts the kzalloc() to resource-managed
kzalloc.
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Oliver Hartkopp [Wed, 18 Jan 2017 20:30:51 +0000 (21:30 +0100)]
can: bcm: fix hrtimer/tasklet termination in bcm op removal
commit
a06393ed03167771246c4c43192d9c264bc48412 upstream.
When removing a bcm tx operation either a hrtimer or a tasklet might run.
As the hrtimer triggers its associated tasklet and vice versa we need to
take care to mutually terminate both handlers.
Reported-by: Michael Josenhans <michael.josenhans@web.de>
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
Tested-by: Michael Josenhans <michael.josenhans@web.de>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Yegor Yefremov [Wed, 18 Jan 2017 10:35:57 +0000 (11:35 +0100)]
can: ti_hecc: add missing prepare and unprepare of the clock
commit
befa60113ce7ea270cb51eada28443ca2756f480 upstream.
In order to make the driver work with the common clock framework, this
patch converts the clk_enable()/clk_disable() to
clk_prepare_enable()/clk_disable_unprepare().
Also add error checking for clk_prepare_enable().
Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Einar Jón [Fri, 12 Aug 2016 11:50:41 +0000 (13:50 +0200)]
can: c_can_pci: fix null-pointer-deref in c_can_start() - set device pointer
commit
c97c52be78b8463ac5407f1cf1f22f8f6cf93a37 upstream.
The priv->device pointer for c_can_pci is never set, but it is used
without a NULL check in c_can_start(). Setting it in c_can_pci_probe()
like c_can_plat_probe() prevents c_can_pci.ko from crashing, with and
without CONFIG_PM.
This might also cause the pm_runtime_*() functions in c_can.c to
actually be executed for c_can_pci devices - they are the only other
place where priv->device is used, but they all contain a null check.
Signed-off-by: Einar Jón <tolvupostur@gmail.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Willy Tarreau <w@1wt.eu>
추지호 [Thu, 8 Dec 2016 12:01:13 +0000 (12:01 +0000)]
can: peak: fix bad memory access and free sequence
commit
b67d0dd7d0dc9e456825447bbeb935d8ef43ea7c upstream.
Fix for bad memory access while disconnecting. netdev is freed before
private data free, and dev is accessed after freeing netdev.
This makes a slub problem, and it raise kernel oops with slub debugger
config.
Signed-off-by: Jiho Chu <jiho.chu@samsung.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Marc Kleine-Budde [Mon, 5 Dec 2016 10:44:23 +0000 (11:44 +0100)]
can: raw: raw_setsockopt: limit number of can_filter that can be set
commit
332b05ca7a438f857c61a3c21a88489a21532364 upstream.
This patch adds a check to limit the number of can_filters that can be
set via setsockopt on CAN_RAW sockets. Otherwise allocations > MAX_ORDER
are not prevented resulting in a warning.
Reference: https://lkml.org/lkml/2016/12/2/230
Reported-by: Andrey Konovalov <andreyknvl@google.com>
Tested-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Tariq Saeed [Fri, 4 Sep 2015 22:44:31 +0000 (15:44 -0700)]
ocfs2: fix BUG_ON() in ocfs2_ci_checkpointed()
commit
3d46a44a0c01b15d385ccaae24b56f619613c256 upstream.
PID: 614 TASK:
ffff882a739da580 CPU: 3 COMMAND: "ocfs2dc"
#0 [
ffff882ecc3759b0] machine_kexec at
ffffffff8103b35d
#1 [
ffff882ecc375a20] crash_kexec at
ffffffff810b95b5
#2 [
ffff882ecc375af0] oops_end at
ffffffff815091d8
#3 [
ffff882ecc375b20] die at
ffffffff8101868b
#4 [
ffff882ecc375b50] do_trap at
ffffffff81508bb0
#5 [
ffff882ecc375ba0] do_invalid_op at
ffffffff810165e5
#6 [
ffff882ecc375c40] invalid_op at
ffffffff815116fb
[exception RIP: ocfs2_ci_checkpointed+208]
RIP:
ffffffffa0a7e940 RSP:
ffff882ecc375cf0 RFLAGS:
00010002
RAX:
0000000000000001 RBX:
000000000000654b RCX:
ffff8812dc83f1f8
RDX:
00000000000017d9 RSI:
ffff8812dc83f1f8 RDI:
ffffffffa0b2c318
RBP:
ffff882ecc375d20 R8:
ffff882ef6ecfa60 R9:
ffff88301f272200
R10:
0000000000000000 R11:
0000000000000000 R12:
ffffffffffffffff
R13:
ffff8812dc83f4f0 R14:
0000000000000000 R15:
ffff8812dc83f1f8
ORIG_RAX:
ffffffffffffffff CS: 0010 SS: 0018
#7 [
ffff882ecc375d28] ocfs2_check_meta_downconvert at
ffffffffa0a7edbd [ocfs2]
#8 [
ffff882ecc375d38] ocfs2_unblock_lock at
ffffffffa0a84af8 [ocfs2]
#9 [
ffff882ecc375dc8] ocfs2_process_blocked_lock at
ffffffffa0a85285 [ocfs2]
assert is tripped because the tran is not checkpointed and the lock level is PR.
Some time ago, chmod command had been executed. As result, the following call
chain left the inode cluster lock in PR state, latter on causing the assert.
system_call_fastpath
-> my_chmod
-> sys_chmod
-> sys_fchmodat
-> notify_change
-> ocfs2_setattr
-> posix_acl_chmod
-> ocfs2_iop_set_acl
-> ocfs2_set_acl
-> ocfs2_acl_set_mode
Here is how.
1119 int ocfs2_setattr(struct dentry *dentry, struct iattr *attr)
1120 {
1247 ocfs2_inode_unlock(inode, 1); <<< WRONG thing to do.
..
1258 if (!status && attr->ia_valid & ATTR_MODE) {
1259 status = posix_acl_chmod(inode, inode->i_mode);
519 posix_acl_chmod(struct inode *inode, umode_t mode)
520 {
..
539 ret = inode->i_op->set_acl(inode, acl, ACL_TYPE_ACCESS);
287 int ocfs2_iop_set_acl(struct inode *inode, struct posix_acl *acl, ...
288 {
289 return ocfs2_set_acl(NULL, inode, NULL, type, acl, NULL, NULL);
224 int ocfs2_set_acl(handle_t *handle,
225 struct inode *inode, ...
231 {
..
252 ret = ocfs2_acl_set_mode(inode, di_bh,
253 handle, mode);
168 static int ocfs2_acl_set_mode(struct inode *inode, struct buffer_head ...
170 {
183 if (handle == NULL) {
>>> BUG: inode lock not held in ex at this point <<<
184 handle = ocfs2_start_trans(OCFS2_SB(inode->i_sb),
185 OCFS2_INODE_UPDATE_CREDITS);
ocfs2_setattr.#1247 we unlock and at #1259 call posix_acl_chmod. When we reach
ocfs2_acl_set_mode.#181 and do trans, the inode cluster lock is not held in EX
mode (it should be). How this could have happended?
We are the lock master, were holding lock EX and have released it in
ocfs2_setattr.#1247. Note that there are no holders of this lock at
this point. Another node needs the lock in PR, and we downconvert from
EX to PR. So the inode lock is PR when do the trans in
ocfs2_acl_set_mode.#184. The trans stays in core (not flushed to disc).
Now another node want the lock in EX, downconvert thread gets kicked
(the one that tripped assert abovt), finds an unflushed trans but the
lock is not EX (it is PR). If the lock was at EX, it would have flushed
the trans ocfs2_ci_checkpointed -> ocfs2_start_checkpoint before
downconverting (to NULL) for the request.
ocfs2_setattr must not drop inode lock ex in this code path. If it
does, takes it again before the trans, say in ocfs2_set_acl, another
cluster node can get in between, execute another setattr, overwriting
the one in progress on this node, resulting in a mode acl size combo
that is a mix of the two.
Orabug:
20189959
Signed-off-by: Tariq Saeed <tariq.x.saeed@oracle.com>
Reviewed-by: Mark Fasheh <mfasheh@suse.de>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Joseph Qi <joseph.qi@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Eric Ren [Wed, 11 Jan 2017 00:57:33 +0000 (16:57 -0800)]
ocfs2: fix crash caused by stale lvb with fsdlm plugin
commit
e7ee2c089e94067d68475990bdeed211c8852917 upstream.
The crash happens rather often when we reset some cluster nodes while
nodes contend fiercely to do truncate and append.
The crash backtrace is below:
dlm:
C21CBDA5E0774F4BA5A9D4F317717495: dlm_recover_grant 1 locks on 971 resources
dlm:
C21CBDA5E0774F4BA5A9D4F317717495: dlm_recover 9 generation 5 done: 4 ms
ocfs2: Begin replay journal (node
318952601, slot 2) on device (253,18)
ocfs2: End replay journal (node
318952601, slot 2) on device (253,18)
ocfs2: Beginning quota recovery on device (253,18) for slot 2
ocfs2: Finishing quota recovery on device (253,18) for slot 2
(truncate,30154,1):ocfs2_truncate_file:470 ERROR: bug expression: le64_to_cpu(fe->i_size) != i_size_read(inode)
(truncate,30154,1):ocfs2_truncate_file:470 ERROR: Inode 290321, inode i_size = 732 != di i_size = 937, i_flags = 0x1
------------[ cut here ]------------
kernel BUG at /usr/src/linux/fs/ocfs2/file.c:470!
invalid opcode: 0000 [#1] SMP
Modules linked in: ocfs2_stack_user(OEN) ocfs2(OEN) ocfs2_nodemanager ocfs2_stackglue(OEN) quota_tree dlm(OEN) configfs fuse sd_mod iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi af_packet iscsi_ibft iscsi_boot_sysfs softdog xfs libcrc32c ppdev parport_pc pcspkr parport joydev virtio_balloon virtio_net i2c_piix4 acpi_cpufreq button processor ext4 crc16 jbd2 mbcache ata_generic cirrus virtio_blk ata_piix drm_kms_helper ahci syscopyarea libahci sysfillrect sysimgblt fb_sys_fops ttm floppy libata drm virtio_pci virtio_ring uhci_hcd virtio ehci_hcd usbcore serio_raw usb_common sg dm_multipath dm_mod scsi_dh_rdac scsi_dh_emc scsi_dh_alua scsi_mod autofs4
Supported: No, Unsupported modules are loaded
CPU: 1 PID: 30154 Comm: truncate Tainted: G OE N 4.4.21-69-default #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
rel-1.8.1-0-g4adadbd-20151112_172657-sheep25 04/01/2014
task:
ffff88004ff6d240 ti:
ffff880074e68000 task.ti:
ffff880074e68000
RIP: 0010:[<
ffffffffa05c8c30>] [<
ffffffffa05c8c30>] ocfs2_truncate_file+0x640/0x6c0 [ocfs2]
RSP: 0018:
ffff880074e6bd50 EFLAGS:
00010282
RAX:
0000000000000074 RBX:
000000000000029e RCX:
0000000000000000
RDX:
0000000000000001 RSI:
0000000000000246 RDI:
0000000000000246
RBP:
ffff880074e6bda8 R08:
000000003675dc7a R09:
ffffffff82013414
R10:
0000000000034c50 R11:
0000000000000000 R12:
ffff88003aab3448
R13:
00000000000002dc R14:
0000000000046e11 R15:
0000000000000020
FS:
00007f839f965700(0000) GS:
ffff88007fc80000(0000) knlGS:
0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0:
000000008005003b
CR2:
00007f839f97e000 CR3:
0000000036723000 CR4:
00000000000006e0
Call Trace:
ocfs2_setattr+0x698/0xa90 [ocfs2]
notify_change+0x1ae/0x380
do_truncate+0x5e/0x90
do_sys_ftruncate.constprop.11+0x108/0x160
entry_SYSCALL_64_fastpath+0x12/0x6d
Code: 24 28 ba d6 01 00 00 48 c7 c6 30 43 62 a0 8b 41 2c 89 44 24 08 48 8b 41 20 48 c7 c1 78 a3 62 a0 48 89 04 24 31 c0 e8 a0 97 f9 ff <0f> 0b 3d 00 fe ff ff 0f 84 ab fd ff ff 83 f8 fc 0f 84 a2 fd ff
RIP [<
ffffffffa05c8c30>] ocfs2_truncate_file+0x640/0x6c0 [ocfs2]
It's because ocfs2_inode_lock() get us stale LVB in which the i_size is
not equal to the disk i_size. We mistakenly trust the LVB because the
underlaying fsdlm dlm_lock() doesn't set lkb_sbflags with
DLM_SBF_VALNOTVALID properly for us. But, why?
The current code tries to downconvert lock without DLM_LKF_VALBLK flag
to tell o2cb don't update RSB's LVB if it's a PR->NULL conversion, even
if the lock resource type needs LVB. This is not the right way for
fsdlm.
The fsdlm plugin behaves different on DLM_LKF_VALBLK, it depends on
DLM_LKF_VALBLK to decide if we care about the LVB in the LKB. If
DLM_LKF_VALBLK is not set, fsdlm will skip recovering RSB's LVB from
this lkb and set the right DLM_SBF_VALNOTVALID appropriately when node
failure happens.
The following diagram briefly illustrates how this crash happens:
RSB1 is inode metadata lock resource with LOCK_TYPE_USES_LVB;
The 1st round:
Node1 Node2
RSB1: PR
RSB1(master): NULL->EX
ocfs2_downconvert_lock(PR->NULL, set_lvb==0)
ocfs2_dlm_lock(no DLM_LKF_VALBLK)
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
dlm_lock(no DLM_LKF_VALBLK)
convert_lock(overwrite lkb->lkb_exflags
with no DLM_LKF_VALBLK)
RSB1: NULL RSB1: EX
reset Node2
dlm_recover_rsbs()
recover_lvb()
/* The LVB is not trustable if the node with EX fails and
* no lock >= PR is left. We should set RSB_VALNOTVALID for RSB1.
*/
if(!(kb_exflags & DLM_LKF_VALBLK)) /* This means we miss the chance to
return; * to invalid the LVB here.
*/
The 2nd round:
Node 1 Node2
RSB1(become master from recovery)
ocfs2_setattr()
ocfs2_inode_lock(NULL->EX)
/* dlm_lock() return the stale lvb without setting DLM_SBF_VALNOTVALID */
ocfs2_meta_lvb_is_trustable() return 1 /* so we don't refresh inode from disk */
ocfs2_truncate_file()
mlog_bug_on_msg(disk isize != i_size_read(inode)) /* crash! */
The fix is quite straightforward. We keep to set DLM_LKF_VALBLK flag
for dlm_lock() if the lock resource type needs LVB and the fsdlm plugin
is uesed.
Link: http://lkml.kernel.org/r/1481275846-6604-1-git-send-email-zren@suse.com
Signed-off-by: Eric Ren <zren@suse.com>
Reviewed-by: Joseph Qi <jiangqi903@gmail.com>
Cc: Mark Fasheh <mfasheh@versity.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Sachin Prabhu [Sun, 16 Apr 2017 19:37:24 +0000 (20:37 +0100)]
cifs: Do not send echoes before Negotiate is complete
commit
62a6cfddcc0a5313e7da3e8311ba16226fe0ac10 upstream.
commit
4fcd1813e640 ("Fix reconnect to not defer smb3 session reconnect
long after socket reconnect") added support for Negotiate requests to
be initiated by echo calls.
To avoid delays in calling echo after a reconnect, I added the patch
introduced by the commit
b8c600120fc8 ("Call echo service immediately
after socket reconnect").
This has however caused a regression with cifs shares which do not have
support for echo calls to trigger Negotiate requests. On connections
which need to call Negotiation, the echo calls trigger an error which
triggers a reconnect which in turn triggers another echo call. This
results in a loop which is only broken when an operation is performed on
the cifs share. For an idle share, it can DOS a server.
The patch uses the smb_operation can_echo() for cifs so that it is
called only if connection has been already been setup.
kernel bz: 194531
Signed-off-by: Sachin Prabhu <sprabhu@redhat.com>
Tested-by: Jonathan Liu <net147@gmail.com>
Acked-by: Pavel Shilovsky <pshilov@microsoft.com>
Signed-off-by: Steve French <smfrench@gmail.com>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Aurelien Aptel [Thu, 26 Jan 2017 13:25:49 +0000 (14:25 +0100)]
fs/cifs: make share unaccessible at root level mountable
commit
a6b5058fafdf508904bbf16c29b24042cef3c496 upstream.
if, when mounting //HOST/share/sub/dir/foo we can query /sub/dir/foo but
not any of the path components above:
- store the /sub/dir/foo prefix in the cifs super_block info
- in the superblock, set root dentry to the subpath dentry (instead of
the share root)
- set a flag in the superblock to remember it
- use prefixpath when building path from a dentry
fixes bso#8950
Signed-off-by: Aurelien Aptel <aaptel@suse.com>
Reviewed-by: Pavel Shilovsky <pshilovsky@samba.org>
Signed-off-by: Steve French <smfrench@gmail.com>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Germano Percossi [Fri, 7 Apr 2017 11:29:37 +0000 (12:29 +0100)]
CIFS: remove bad_network_name flag
commit
a0918f1ce6a43ac980b42b300ec443c154970979 upstream.
STATUS_BAD_NETWORK_NAME can be received during node failover,
causing the flag to be set and making the reconnect thread
always unsuccessful, thereafter.
Once the only place where it is set is removed, the remaining
bits are rendered moot.
Removing it does not prevent "mount" from failing when a non
existent share is passed.
What happens when the share really ceases to exist while the
share is mounted is undefined now as much as it was before.
Signed-off-by: Germano Percossi <germano.percossi@citrix.com>
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
Signed-off-by: Steve French <smfrench@gmail.com>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Pavel Shilovsky [Wed, 30 Nov 2016 00:14:43 +0000 (16:14 -0800)]
CIFS: Fix a possible memory corruption in push locks
commit
e3d240e9d505fc67f8f8735836df97a794bbd946 upstream.
If maxBuf is not 0 but less than a size of SMB2 lock structure
we can end up with a memory corruption.
Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Pavel Shilovsky [Tue, 29 Nov 2016 19:30:58 +0000 (11:30 -0800)]
CIFS: Fix missing nls unload in smb2_reconnect()
commit
4772c79599564bd08ee6682715a7d3516f67433f upstream.
Acked-by: Sachin Prabhu <sprabhu@redhat.com>
Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Pavel Shilovsky [Fri, 4 Nov 2016 18:50:31 +0000 (11:50 -0700)]
CIFS: Fix a possible memory corruption during reconnect
commit
53e0e11efe9289535b060a51d4cf37c25e0d0f2b upstream.
We can not unlock/lock cifs_tcp_ses_lock while walking through ses
and tcon lists because it can corrupt list iterator pointers and
a tcon structure can be released if we don't hold an extra reference.
Fix it by moving a reconnect process to a separate delayed work
and acquiring a reference to every tcon that needs to be reconnected.
Also do not send an echo request on newly established connections.
Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Willy Tarreau <w@1wt.eu>
colyli@suse.de [Sat, 28 Jan 2017 13:11:49 +0000 (21:11 +0800)]
md linear: fix a race between linear_add() and linear_congested()
commit
03a9e24ef2aaa5f1f9837356aed79c860521407a upstream.
Recently I receive a bug report that on Linux v3.0 based kerenl, hot add
disk to a md linear device causes kernel crash at linear_congested(). From
the crash image analysis, I find in linear_congested(), mddev->raid_disks
contains value N, but conf->disks[] only has N-1 pointers available. Then
a NULL pointer deference crashes the kernel.
There is a race between linear_add() and linear_congested(), RCU stuffs
used in these two functions cannot avoid the race. Since Linuv v4.0
RCU code is replaced by introducing mddev_suspend(). After checking the
upstream code, it seems linear_congested() is not called in
generic_make_request() code patch, so mddev_suspend() cannot provent it
from being called. The possible race still exists.
Here I explain how the race still exists in current code. For a machine
has many CPUs, on one CPU, linear_add() is called to add a hard disk to a
md linear device; at the same time on other CPU, linear_congested() is
called to detect whether this md linear device is congested before issuing
an I/O request onto it.
Now I use a possible code execution time sequence to demo how the possible
race happens,
seq linear_add() linear_congested()
0 conf=mddev->private
1 oldconf=mddev->private
2 mddev->raid_disks++
3 for (i=0; i<mddev->raid_disks;i++)
4 bdev_get_queue(conf->disks[i].rdev->bdev)
5 mddev->private=newconf
In linear_add() mddev->raid_disks is increased in time seq 2, and on
another CPU in linear_congested() the for-loop iterates conf->disks[i] by
the increased mddev->raid_disks in time seq 3,4. But conf with one more
element (which is a pointer to struct dev_info type) to conf->disks[] is
not updated yet, accessing its structure member in time seq 4 will cause a
NULL pointer deference fault.
To fix this race, there are 2 parts of modification in the patch,
1) Add 'int raid_disks' in struct linear_conf, as a copy of
mddev->raid_disks. It is initialized in linear_conf(), always being
consistent with pointers number of 'struct dev_info disks[]'. When
iterating conf->disks[] in linear_congested(), use conf->raid_disks to
replace mddev->raid_disks in the for-loop, then NULL pointer deference
will not happen again.
2) RCU stuffs are back again, and use kfree_rcu() in linear_add() to
free oldconf memory. Because oldconf may be referenced as mddev->private
in linear_congested(), kfree_rcu() makes sure that its memory will not
be released until no one uses it any more.
Also some code comments are added in this patch, to make this modification
to be easier understandable.
This patch can be applied for kernels since v4.0 after commit:
3be260cc18f8 ("md/linear: remove rcu protections in favour of
suspend/resume"). But this bug is reported on Linux v3.0 based kernel, for
people who maintain kernels before Linux v4.0, they need to do some back
back port to this patch.
Changelog:
- V3: add 'int raid_disks' in struct linear_conf, and use kfree_rcu() to
replace rcu_call() in linear_add().
- v2: add RCU stuffs by suggestion from Shaohua and Neil.
- v1: initial effort.
Signed-off-by: Coly Li <colyli@suse.de>
Cc: Shaohua Li <shli@fb.com>
Cc: Neil Brown <neilb@suse.com>
Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Wei Fang [Mon, 21 Mar 2016 11:18:32 +0000 (19:18 +0800)]
md:raid1: fix a dead loop when read from a WriteMostly disk
commit
816b0acf3deb6d6be5d0519b286fdd4bafade905 upstream.
If first_bad == this_sector when we get the WriteMostly disk
in read_balance(), valid disk will be returned with zero
max_sectors. It'll lead to a dead loop in make_request(), and
OOM will happen because of endless allocation of struct bio.
Since we can't get data from this disk in this case, so
continue for another disk.
Signed-off-by: Wei Fang <fangwei1@huawei.com>
Signed-off-by: Shaohua Li <shli@fb.com>
Cc: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Konstantin Khlebnikov [Sun, 27 Nov 2016 16:32:32 +0000 (19:32 +0300)]
md/raid5: limit request size according to implementation limits
commit
e8d7c33232e5fdfa761c3416539bc5b4acd12db5 upstream.
Current implementation employ 16bit counter of active stripes in lower
bits of bio->bi_phys_segments. If request is big enough to overflow
this counter bio will be completed and freed too early.
Fortunately this not happens in default configuration because several
other limits prevent that: stripe_cache_size * nr_disks effectively
limits count of active stripes. And small max_sectors_kb at lower
disks prevent that during normal read/write operations.
Overflow easily happens in discard if it's enabled by module parameter
"devices_handle_discard_safely" and stripe_cache_size is set big enough.
This patch limits requests size with 256Mb - 8Kb to prevent overflows.
Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Cc: Shaohua Li <shli@kernel.org>
Cc: Neil Brown <neilb@suse.com>
Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Benjamin Marzinski [Wed, 30 Nov 2016 23:56:14 +0000 (17:56 -0600)]
dm space map metadata: fix 'struct sm_metadata' leak on failed create
commit
314c25c56c1ee5026cf99c570bdfe01847927acb upstream.
In dm_sm_metadata_create() we temporarily change the dm_space_map
operations from 'ops' (whose .destroy function deallocates the
sm_metadata) to 'bootstrap_ops' (whose .destroy function doesn't).
If dm_sm_metadata_create() fails in sm_ll_new_metadata() or
sm_ll_extend(), it exits back to dm_tm_create_internal(), which calls
dm_sm_destroy() with the intention of freeing the sm_metadata, but it
doesn't (because the dm_space_map operations is still set to
'bootstrap_ops').
Fix this by setting the dm_space_map operations back to 'ops' if
dm_sm_metadata_create() fails when it is set to 'bootstrap_ops'.
[js] no nr_blocks test in 3.12 yet
Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com>
Acked-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Ondrej Kozina [Wed, 2 Nov 2016 14:02:08 +0000 (15:02 +0100)]
dm crypt: mark key as invalid until properly loaded
commit
265e9098bac02bc5e36cda21fdbad34cb5b2f48d upstream.
In crypt_set_key(), if a failure occurs while replacing the old key
(e.g. tfm->setkey() fails) the key must not have DM_CRYPT_KEY_VALID flag
set. Otherwise, the crypto layer would have an invalid key that still
has DM_CRYPT_KEY_VALID flag set.
Signed-off-by: Ondrej Kozina <okozina@redhat.com>
Reviewed-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Dan Williams [Tue, 29 Dec 2015 22:02:29 +0000 (14:02 -0800)]
block: fix del_gendisk() vs blkdev_ioctl crash
commit
ac34f15e0c6d2fd58480052b6985f6991fb53bcc upstream.
When tearing down a block device early in its lifetime, userspace may
still be performing discovery actions like blkdev_ioctl() to re-read
partitions.
The nvdimm_revalidate_disk() implementation depends on
disk->driverfs_dev to be valid at entry. However, it is set to NULL in
del_gendisk() and fatally this is happening *before* the disk device is
deleted from userspace view.
There's no reason for del_gendisk() to clear ->driverfs_dev. That
device is the parent of the disk. It is guaranteed to not be freed
until the disk, as a child, drops its ->parent reference.
We could also fix this issue locally in nvdimm_revalidate_disk() by
using disk_to_dev(disk)->parent, but lets fix it globally since
->driverfs_dev follows the lifetime of the parent. Longer term we
should probably just add a @parent parameter to add_disk(), and stop
carrying this pointer in the gendisk.
BUG: unable to handle kernel NULL pointer dereference at (null)
IP: [<
ffffffffa00340a8>] nvdimm_revalidate_disk+0x18/0x90 [libnvdimm]
CPU: 2 PID: 538 Comm: systemd-udevd Tainted: G O 4.4.0-rc5 #2257
[..]
Call Trace:
[<
ffffffff8143e5c7>] rescan_partitions+0x87/0x2c0
[<
ffffffff810f37f9>] ? __lock_is_held+0x49/0x70
[<
ffffffff81438c62>] __blkdev_reread_part+0x72/0xb0
[<
ffffffff81438cc5>] blkdev_reread_part+0x25/0x40
[<
ffffffff8143982d>] blkdev_ioctl+0x4fd/0x9c0
[<
ffffffff811246c9>] ? current_kernel_time64+0x69/0xd0
[<
ffffffff812916dd>] block_ioctl+0x3d/0x50
[<
ffffffff81264c38>] do_vfs_ioctl+0x308/0x560
[<
ffffffff8115dbd1>] ? __audit_syscall_entry+0xb1/0x100
[<
ffffffff810031d6>] ? do_audit_syscall_entry+0x66/0x70
[<
ffffffff81264f09>] SyS_ioctl+0x79/0x90
[<
ffffffff81902672>] entry_SYSCALL_64_fastpath+0x12/0x76
Cc: Jan Kara <jack@suse.cz>
Cc: Jens Axboe <axboe@fb.com>
Reported-by: Robert Hu <robert.hu@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Mauricio Faria de Oliveira [Sat, 25 Mar 2017 16:18:14 +0000 (21:48 +0530)]
block: allow WRITE_SAME commands with the SG_IO ioctl
commit
25cdb64510644f3e854d502d69c73f21c6df88a9 upstream.
The WRITE_SAME commands are not present in the blk_default_cmd_filter
write_ok list, and thus are failed with -EPERM when the SG_IO ioctl()
is executed without CAP_SYS_RAWIO capability (e.g., unprivileged users).
[ sg_io() -> blk_fill_sghdr_rq() > blk_verify_command() -> -EPERM ]
The problem can be reproduced with the sg_write_same command
# sg_write_same --num 1 --xferlen 512 /dev/sda
#
# capsh --drop=cap_sys_rawio -- -c \
'sg_write_same --num 1 --xferlen 512 /dev/sda'
Write same: pass through os error: Operation not permitted
#
For comparison, the WRITE_VERIFY command does not observe this problem,
since it is in that list:
# capsh --drop=cap_sys_rawio -- -c \
'sg_write_verify --num 1 --ilen 512 --lba 0 /dev/sda'
#
So, this patch adds the WRITE_SAME commands to the list, in order
for the SG_IO ioctl to finish successfully:
# capsh --drop=cap_sys_rawio -- -c \
'sg_write_same --num 1 --xferlen 512 /dev/sda'
#
That case happens to be exercised by QEMU KVM guests with 'scsi-block' devices
(qemu "-device scsi-block" [1], libvirt "<disk type='block' device='lun'>" [2]),
which employs the SG_IO ioctl() and runs as an unprivileged user (libvirt-qemu).
In that scenario, when a filesystem (e.g., ext4) performs its zero-out calls,
which are translated to write-same calls in the guest kernel, and then into
SG_IO ioctls to the host kernel, SCSI I/O errors may be observed in the guest:
[...] sd 0:0:0:0: [sda] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[...] sd 0:0:0:0: [sda] tag#0 Sense Key : Aborted Command [current]
[...] sd 0:0:0:0: [sda] tag#0 Add. Sense: I/O process terminated
[...] sd 0:0:0:0: [sda] tag#0 CDB: Write Same(10) 41 00 01 04 e0 78 00 00 08 00
[...] blk_update_request: I/O error, dev sda, sector
17096824
Links:
[1] http://git.qemu.org/?p=qemu.git;a=commit;h=
336a6915bc7089fb20fea4ba99972ad9a97c5f52
[2] https://libvirt.org/formatdomain.html#elementsDisks (see 'disk' -> 'device')
Signed-off-by: Mauricio Faria de Oliveira <mauricfo@linux.vnet.ibm.com>
Signed-off-by: Brahadambal Srinivasan <latha@linux.vnet.ibm.com>
Reported-by: Manjunatha H R <manjuhr1@in.ibm.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Omar Sandoval [Fri, 1 Jul 2016 07:39:35 +0000 (00:39 -0700)]
block: fix use-after-free in sys_ioprio_get()
commit
8ba8682107ee2ca3347354e018865d8e1967c5f4 upstream.
get_task_ioprio() accesses the task->io_context without holding the task
lock and thus can race with exit_io_context(), leading to a
use-after-free. The reproducer below hits this within a few seconds on
my 4-core QEMU VM:
int main(int argc, char **argv)
{
pid_t pid, child;
long nproc, i;
/* ioprio_set(IOPRIO_WHO_PROCESS, 0, IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0)); */
syscall(SYS_ioprio_set, 1, 0, 0x6000);
nproc = sysconf(_SC_NPROCESSORS_ONLN);
for (i = 0; i < nproc; i++) {
pid = fork();
assert(pid != -1);
if (pid == 0) {
for (;;) {
pid = fork();
assert(pid != -1);
if (pid == 0) {
_exit(0);
} else {
child = wait(NULL);
assert(child == pid);
}
}
}
pid = fork();
assert(pid != -1);
if (pid == 0) {
for (;;) {
/* ioprio_get(IOPRIO_WHO_PGRP, 0); */
syscall(SYS_ioprio_get, 2, 0);
}
}
}
for (;;) {
/* ioprio_get(IOPRIO_WHO_PGRP, 0); */
syscall(SYS_ioprio_get, 2, 0);
}
return 0;
}
This gets us KASAN dumps like this:
[ 35.526914] ==================================================================
[ 35.530009] BUG: KASAN: out-of-bounds in get_task_ioprio+0x7b/0x90 at addr
ffff880066f34e6c
[ 35.530009] Read of size 2 by task ioprio-gpf/363
[ 35.530009] =============================================================================
[ 35.530009] BUG blkdev_ioc (Not tainted): kasan: bad access detected
[ 35.530009] -----------------------------------------------------------------------------
[ 35.530009] Disabling lock debugging due to kernel taint
[ 35.530009] INFO: Allocated in create_task_io_context+0x2b/0x370 age=0 cpu=0 pid=360
[ 35.530009] ___slab_alloc+0x55d/0x5a0
[ 35.530009] __slab_alloc.isra.20+0x2b/0x40
[ 35.530009] kmem_cache_alloc_node+0x84/0x200
[ 35.530009] create_task_io_context+0x2b/0x370
[ 35.530009] get_task_io_context+0x92/0xb0
[ 35.530009] copy_process.part.8+0x5029/0x5660
[ 35.530009] _do_fork+0x155/0x7e0
[ 35.530009] SyS_clone+0x19/0x20
[ 35.530009] do_syscall_64+0x195/0x3a0
[ 35.530009] return_from_SYSCALL_64+0x0/0x6a
[ 35.530009] INFO: Freed in put_io_context+0xe7/0x120 age=0 cpu=0 pid=1060
[ 35.530009] __slab_free+0x27b/0x3d0
[ 35.530009] kmem_cache_free+0x1fb/0x220
[ 35.530009] put_io_context+0xe7/0x120
[ 35.530009] put_io_context_active+0x238/0x380
[ 35.530009] exit_io_context+0x66/0x80
[ 35.530009] do_exit+0x158e/0x2b90
[ 35.530009] do_group_exit+0xe5/0x2b0
[ 35.530009] SyS_exit_group+0x1d/0x20
[ 35.530009] entry_SYSCALL_64_fastpath+0x1a/0xa4
[ 35.530009] INFO: Slab 0xffffea00019bcd00 objects=20 used=4 fp=0xffff880066f34ff0 flags=0x1fffe0000004080
[ 35.530009] INFO: Object 0xffff880066f34e58 @offset=3672 fp=0x0000000000000001
[ 35.530009] ==================================================================
Fix it by grabbing the task lock while we poke at the io_context.
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
Acked-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Daeho Jeong [Thu, 1 Dec 2016 16:49:12 +0000 (11:49 -0500)]
ext4: fix inode checksum calculation problem if i_extra_size is small
commit
05ac5aa18abd7db341e54df4ae2b4c98ea0e43b7 upstream.
We've fixed the race condition problem in calculating ext4 checksum
value in commit
b47820edd163 ("ext4: avoid modifying checksum fields
directly during checksum veficationon"). However, by this change,
when calculating the checksum value of inode whose i_extra_size is
less than 4, we couldn't calculate the checksum value in a proper way.
This problem was found and reported by Nix, Thank you.
Reported-by: Nix <nix@esperi.org.uk>
Signed-off-by: Daeho Jeong <daeho.jeong@samsung.com>
Signed-off-by: Youngjin Gil <youngjin.gil@samsung.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Theodore Ts'o [Sun, 5 Feb 2017 06:26:48 +0000 (01:26 -0500)]
ext4: return EROFS if device is r/o and journal replay is needed
commit
4753d8a24d4588657bc0a4cd66d4e282dff15c8c upstream.
If the file system requires journal recovery, and the device is
read-ony, return EROFS to the mount system call. This allows xfstests
generic/050 to pass.
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Theodore Ts'o [Sun, 5 Feb 2017 04:38:06 +0000 (23:38 -0500)]
ext4: preserve the needs_recovery flag when the journal is aborted
commit
97abd7d4b5d9c48ec15c425485f054e1c15e591b upstream.
If the journal is aborted, the needs_recovery feature flag should not
be removed. Otherwise, it's the journal might not get replayed and
this could lead to more data getting lost.
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Jan Kara [Fri, 27 Jan 2017 19:34:30 +0000 (14:34 -0500)]
ext4: trim allocation requests to group size
commit
cd648b8a8fd5071d232242d5ee7ee3c0815776af upstream.
If filesystem groups are artifically small (using parameter -g to
mkfs.ext4), ext4_mb_normalize_request() can result in a request that is
larger than a block group. Trim the request size to not confuse
allocation code.
Reported-by: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Theodore Ts'o [Wed, 15 Feb 2017 06:26:39 +0000 (01:26 -0500)]
ext4: fix fencepost in s_first_meta_bg validation
commit
2ba3e6e8afc9b6188b471f27cf2b5e3cf34e7af2 upstream.
It is OK for s_first_meta_bg to be equal to the number of block group
descriptor blocks. (It rarely happens, but it shouldn't cause any
problems.)
https://bugzilla.kernel.org/show_bug.cgi?id=194567
Fixes:
3a4b77cd47bb837b8557595ec7425f281f2ca1fe
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Theodore Ts'o [Sun, 5 Feb 2017 04:14:19 +0000 (23:14 -0500)]
jbd2: don't leak modified metadata buffers on an aborted journal
commit
e112666b4959b25a8552d63bc564e1059be703e8 upstream.
If the journal has been aborted, we shouldn't mark the underlying
buffer head as dirty, since that will cause the metadata block to get
modified. And if the journal has been aborted, we shouldn't allow
this since it will almost certainly lead to a corrupted file system.
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Eryu Guan [Thu, 1 Dec 2016 20:08:37 +0000 (15:08 -0500)]
ext4: validate s_first_meta_bg at mount time
commit
3a4b77cd47bb837b8557595ec7425f281f2ca1fe upstream.
Ralf Spenneberg reported that he hit a kernel crash when mounting a
modified ext4 image. And it turns out that kernel crashed when
calculating fs overhead (ext4_calculate_overhead()), this is because
the image has very large s_first_meta_bg (debug code shows it's
842150400), and ext4 overruns the memory in count_overhead() when
setting bitmap buffer, which is PAGE_SIZE.
ext4_calculate_overhead():
buf = get_zeroed_page(GFP_NOFS); <=== PAGE_SIZE buffer
blks = count_overhead(sb, i, buf);
count_overhead():
for (j = ext4_bg_num_gdb(sb, grp); j > 0; j--) { <=== j =
842150400
ext4_set_bit(EXT4_B2C(sbi, s++), buf); <=== buffer overrun
count++;
}
This can be reproduced easily for me by this script:
#!/bin/bash
rm -f fs.img
mkdir -p /mnt/ext4
fallocate -l 16M fs.img
mke2fs -t ext4 -O bigalloc,meta_bg,^resize_inode -F fs.img
debugfs -w -R "ssv first_meta_bg
842150400" fs.img
mount -o loop fs.img /mnt/ext4
Fix it by validating s_first_meta_bg first at mount time, and
refusing to mount if its value exceeds the largest possible meta_bg
number.
[js] use EXT4_HAS_INCOMPAT_FEATURE instead of new
ext4_has_feature_meta_bg
Reported-by: Ralf Spenneberg <ralf@os-t.de>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Andreas Dilger <adilger@dilger.ca>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Theodore Ts'o [Fri, 18 Nov 2016 18:37:47 +0000 (13:37 -0500)]
ext4: add sanity checking to count_overhead()
commit
c48ae41bafe31e9a66d8be2ced4e42a6b57fa814 upstream.
The commit "ext4: sanity check the block and cluster size at mount
time" should prevent any problems, but in case the superblock is
modified while the file system is mounted, add an extra safety check
to make sure we won't overrun the allocated buffer.
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Theodore Ts'o [Fri, 18 Nov 2016 18:24:26 +0000 (13:24 -0500)]
ext4: fix in-superblock mount options processing
commit
5aee0f8a3f42c94c5012f1673420aee96315925a upstream.
Fix a large number of problems with how we handle mount options in the
superblock. For one, if the string in the superblock is long enough
that it is not null terminated, we could run off the end of the string
and try to interpret superblocks fields as characters. It's unlikely
this will cause a security problem, but it could result in an invalid
parse. Also, parse_options is destructive to the string, so in some
cases if there is a comma-separated string, it would be modified in
the superblock. (Fortunately it only happens on file systems with a
1k block size.)
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Theodore Ts'o [Fri, 18 Nov 2016 18:28:30 +0000 (13:28 -0500)]
ext4: use more strict checks for inodes_per_block on mount
commit
cd6bb35bf7f6d7d922509bf50265383a0ceabe96 upstream.
Centralize the checks for inodes_per_block and be more strict to make
sure the inodes_per_block_group can't end up being zero.
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Andreas Dilger <adilger@dilger.ca>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Liu Bo [Wed, 3 Aug 2016 19:33:01 +0000 (12:33 -0700)]
Btrfs: fix memory leak in reading btree blocks
commit
2571e739677f1e4c0c63f5ed49adcc0857923625 upstream.
So we can read a btree block via readahead or intentional read,
and we can end up with a memory leak when something happens as
follows,
1) readahead starts to read block A but does not wait for read
completion,
2) btree_readpage_end_io_hook finds that block A is corrupted,
and it needs to clear all block A's pages' uptodate bit.
3) meanwhile an intentional read kicks in and checks block A's
pages' uptodate to decide which page needs to be read.
4) when some pages have the uptodate bit during 3)'s check so
3) doesn't count them for eb->io_pages, but they are later
cleared by 2) so we has to readpage on the page, we get
the wrong eb->io_pages which results in a memory leak of
this block.
This fixes the problem by firstly getting all pages's locking and
then checking pages' uptodate bit.
t1(readahead) t2(readahead endio) t3(the following read)
read_extent_buffer_pages end_bio_extent_readpage
for pg in eb: for page 0,1,2 in eb:
if pg is uptodate: btree_readpage_end_io_hook(pg)
num_reads++ if uptodate:
eb->io_pages = num_reads SetPageUptodate(pg) _______________
for pg in eb: for page 3 in eb: read_extent_buffer_pages
if pg is NOT uptodate: btree_readpage_end_io_hook(pg) for pg in eb:
__extent_read_full_page(pg) sanity check reports something wrong if pg is uptodate:
clear_extent_buffer_uptodate(eb) num_reads++
for pg in eb: eb->io_pages = num_reads
ClearPageUptodate(page) _______________
for pg in eb:
if pg is NOT uptodate:
__extent_read_full_page(pg)
So t3's eb->io_pages is not consistent with the number of pages it's reading,
and during endio(), atomic_dec_and_test(&eb->io_pages) will get a negative
number so that we're not able to free the eb.
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Jeff Mahoney [Sat, 3 Dec 2016 03:21:55 +0000 (22:21 -0500)]
Revert "Btrfs: don't delay inode ref updates during log, replay"
commit
081fafddc3ff1e86e36024b0177c08e340b19a12 upstream.
This reverts commit
644d10716875b24388680925d6c7502420987bfe, upstream
commit
6f8960541b1eb6054a642da48daae2320fddba93.
The original patch for mainline,
6f8960541b1 (Btrfs: don't delay
inode ref updates during log replay) lists
1d52c78afbb (Btrfs: try
not to ENOSPC on log replay) as the only pre-3.18 dependency, but it
also depends on
67de11769bd (Btrfs: introduce the delayed inode ref
deletion for the single link inode), which was introduced in 3.14
and isn't in 3.12.y.
The -stable commit added the check to btrfs_delayed_update_inode,
which may look similar to btrfs_delayed_delete_inode_ref, but it's
only superficial. The tops of both functions handle typical
delayed node boilerplate. The upshot is that the patch is harmless
since the caller already checks to see if we're doing log recovery,
so we're not breaking anything. It should be reverted because it
makes it appear as if this issue was fixed for users who did
backport
67de11769bd, when it is not.
Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Willy Tarreau [Thu, 15 Jun 2017 17:56:54 +0000 (19:56 +0200)]
Linux 3.10.106
Andrey Konovalov [Thu, 16 Feb 2017 16:22:46 +0000 (17:22 +0100)]
dccp: fix freeing skb too early for IPV6_RECVPKTINFO
[ Upstream commit
5edabca9d4cff7f1f2b68f0bac55ef99d9798ba4 ]
In the current DCCP implementation an skb for a DCCP_PKT_REQUEST packet
is forcibly freed via __kfree_skb in dccp_rcv_state_process if
dccp_v6_conn_request successfully returns.
However, if IPV6_RECVPKTINFO is set on a socket, the address of the skb
is saved to ireq->pktopts and the ref count for skb is incremented in
dccp_v6_conn_request, so skb is still in use. Nevertheless, it gets freed
in dccp_rcv_state_process.
Fix by calling consume_skb instead of doing goto discard and therefore
calling __kfree_skb.
Similar fixes for TCP:
fb7e2399ec17f1004c0e0ccfd17439f8759ede01 [TCP]: skb is unexpectedly freed.
0aea76d35c9651d55bbaf746e7914e5f9ae5a25d tcp: SYN packets are now
simply consumed
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Willy Tarreau [Tue, 16 May 2017 17:18:55 +0000 (19:18 +0200)]
char: lp: fix possible integer overflow in lp_setup()
commit
3e21f4af170bebf47c187c1ff8bf155583c9f3b1 upstream.
The lp_setup() code doesn't apply any bounds checking when passing
"lp=none", and only in this case, resulting in an overflow of the
parport_nr[] array. All versions in Git history are affected.
Reported-By: Roee Hay <roee.hay@hcl.com>
Cc: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Eric Dumazet [Tue, 9 May 2017 13:29:19 +0000 (06:29 -0700)]
dccp/tcp: do not inherit mc_list from parent
commit
657831ffc38e30092a2d5f03d385d710eb88b09a upstream.
syzkaller found a way to trigger double frees from ip_mc_drop_socket()
It turns out that leave a copy of parent mc_list at accept() time,
which is very bad.
Very similar to commit
8b485ce69876 ("tcp: do not inherit
fastopen_req from parent")
Initial report from Pray3r, completed by Andrey one.
Thanks a lot to them !
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Pray3r <pray3r.z@gmail.com>
Reported-by: Andrey Konovalov <andreyknvl@google.com>
Tested-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Keno Fischer [Tue, 24 Jan 2017 23:17:48 +0000 (15:17 -0800)]
mm/huge_memory.c: respect FOLL_FORCE/FOLL_COW for thp
commit
8310d48b125d19fcd9521d83b8293e63eb1646aa upstream.
In commit
19be0eaffa3a ("mm: remove gup_flags FOLL_WRITE games from
__get_user_pages()"), the mm code was changed from unsetting FOLL_WRITE
after a COW was resolved to setting the (newly introduced) FOLL_COW
instead. Simultaneously, the check in gup.c was updated to still allow
writes with FOLL_FORCE set if FOLL_COW had also been set.
However, a similar check in huge_memory.c was forgotten. As a result,
remote memory writes to ro regions of memory backed by transparent huge
pages cause an infinite loop in the kernel (handle_mm_fault sets
FOLL_COW and returns 0 causing a retry, but follow_trans_huge_pmd bails
out immidiately because `(flags & FOLL_WRITE) && !pmd_write(*pmd)` is
true.
While in this state the process is stil SIGKILLable, but little else
works (e.g. no ptrace attach, no other signals). This is easily
reproduced with the following code (assuming thp are set to always):
#include <assert.h>
#include <fcntl.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#define TEST_SIZE 5 * 1024 * 1024
int main(void) {
int status;
pid_t child;
int fd = open("/proc/self/mem", O_RDWR);
void *addr = mmap(NULL, TEST_SIZE, PROT_READ,
MAP_ANONYMOUS | MAP_PRIVATE, 0, 0);
assert(addr != MAP_FAILED);
pid_t parent_pid = getpid();
if ((child = fork()) == 0) {
void *addr2 = mmap(NULL, TEST_SIZE, PROT_READ | PROT_WRITE,
MAP_ANONYMOUS | MAP_PRIVATE, 0, 0);
assert(addr2 != MAP_FAILED);
memset(addr2, 'a', TEST_SIZE);
pwrite(fd, addr2, TEST_SIZE, (uintptr_t)addr);
return 0;
}
assert(child == waitpid(child, &status, 0));
assert(WIFEXITED(status) && WEXITSTATUS(status) == 0);
return 0;
}
Fix this by updating follow_trans_huge_pmd in huge_memory.c analogously
to the update in gup.c in the original commit. The same pattern exists
in follow_devmap_pmd. However, we should not be able to reach that
check with FOLL_COW set, so add WARN_ONCE to make sure we notice if we
ever do.
[akpm@linux-foundation.org: coding-style fixes]
Link: http://lkml.kernel.org/r/20170106015025.GA38411@juliacomputing.com
Signed-off-by: Keno Fischer <keno@juliacomputing.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Greg Thelen <gthelen@google.com>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Willy Tarreau <w@1wt.eu>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
[bwh: Backported to 3.2:
- Drop change to follow_devmap_pmd()
- pmd_dirty() is not available; check the page flags as in
can_follow_write_pte()
- Adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
[mhocko:
This has been forward ported from the 3.2 stable tree.
And fixed to return NULL.]
Reviewed-by: Michal Hocko <mhocko@suse.cz>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Aleksa Sarai [Wed, 21 Dec 2016 05:26:24 +0000 (16:26 +1100)]
fs: exec: apply CLOEXEC before changing dumpable task flags
commit
613cc2b6f272c1a8ad33aefa21cad77af23139f7 upstream.
If you have a process that has set itself to be non-dumpable, and it
then undergoes exec(2), any CLOEXEC file descriptors it has open are
"exposed" during a race window between the dumpable flags of the process
being reset for exec(2) and CLOEXEC being applied to the file
descriptors. This can be exploited by a process by attempting to access
/proc/<pid>/fd/... during this window, without requiring CAP_SYS_PTRACE.
The race in question is after set_dumpable has been (for get_link,
though the trace is basically the same for readlink):
[vfs]
-> proc_pid_link_inode_operations.get_link
-> proc_pid_get_link
-> proc_fd_access_allowed
-> ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS);
Which will return 0, during the race window and CLOEXEC file descriptors
will still be open during this window because do_close_on_exec has not
been called yet. As a result, the ordering of these calls should be
reversed to avoid this race window.
This is of particular concern to container runtimes, where joining a
PID namespace with file descriptors referring to the host filesystem
can result in security issues (since PRCTL_SET_DUMPABLE doesn't protect
against access of CLOEXEC file descriptors -- file descriptors which may
reference filesystem objects the container shouldn't have access to).
Cc: dev@opencontainers.org
Reported-by: Michael Crosby <crosbymichael@gmail.com>
Signed-off-by: Aleksa Sarai <asarai@suse.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Dave Jones [Thu, 22 Dec 2016 16:16:22 +0000 (11:16 -0500)]
ipv6: handle -EFAULT from skb_copy_bits
commit
a98f91758995cb59611e61318dddd8a6956b52c3 upstream.
By setting certain socket options on ipv6 raw sockets, we can confuse the
length calculation in rawv6_push_pending_frames triggering a BUG_ON.
RIP: 0010:[<
ffffffff817c6390>] [<
ffffffff817c6390>] rawv6_sendmsg+0xc30/0xc40
RSP: 0018:
ffff881f6c4a7c18 EFLAGS:
00010282
RAX:
00000000fffffff2 RBX:
ffff881f6c681680 RCX:
0000000000000002
RDX:
ffff881f6c4a7cf8 RSI:
0000000000000030 RDI:
ffff881fed0f6a00
RBP:
ffff881f6c4a7da8 R08:
0000000000000000 R09:
0000000000000009
R10:
ffff881fed0f6a00 R11:
0000000000000009 R12:
0000000000000030
R13:
ffff881fed0f6a00 R14:
ffff881fee39ba00 R15:
ffff881fefa93a80
Call Trace:
[<
ffffffff8118ba23>] ? unmap_page_range+0x693/0x830
[<
ffffffff81772697>] inet_sendmsg+0x67/0xa0
[<
ffffffff816d93f8>] sock_sendmsg+0x38/0x50
[<
ffffffff816d982f>] SYSC_sendto+0xef/0x170
[<
ffffffff816da27e>] SyS_sendto+0xe/0x10
[<
ffffffff81002910>] do_syscall_64+0x50/0xa0
[<
ffffffff817f7cbc>] entry_SYSCALL64_slow_path+0x25/0x25
Handle by jumping to the failure path if skb_copy_bits gets an EFAULT.
Reproducer:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#define LEN 504
int main(int argc, char* argv[])
{
int fd;
int zero = 0;
char buf[LEN];
memset(buf, 0, LEN);
fd = socket(AF_INET6, SOCK_RAW, 7);
setsockopt(fd, SOL_IPV6, IPV6_CHECKSUM, &zero, 4);
setsockopt(fd, SOL_IPV6, IPV6_DSTOPTS, &buf, LEN);
sendto(fd, buf, 1, 0, (struct sockaddr *) buf, 110);
}
Signed-off-by: Dave Jones <davej@codemonkey.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Alexander Popov [Tue, 28 Feb 2017 16:54:40 +0000 (19:54 +0300)]
tty: n_hdlc: get rid of racy n_hdlc.tbuf
commit
82f2341c94d270421f383641b7cd670e474db56b upstream.
Currently N_HDLC line discipline uses a self-made singly linked list for
data buffers and has n_hdlc.tbuf pointer for buffer retransmitting after
an error.
The commit
be10eb7589337e5defbe214dae038a53dd21add8
("tty: n_hdlc add buffer flushing") introduced racy access to n_hdlc.tbuf.
After tx error concurrent flush_tx_queue() and n_hdlc_send_frames() can put
one data buffer to tx_free_buf_list twice. That causes double free in
n_hdlc_release().
Let's use standard kernel linked list and get rid of n_hdlc.tbuf:
in case of tx error put current data buffer after the head of tx_buf_list.
Signed-off-by: Alexander Popov <alex.popov@linux.com>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Jiri Slaby [Thu, 26 Nov 2015 18:28:26 +0000 (19:28 +0100)]
TTY: n_hdlc, fix lockdep false positive
commit
e9b736d88af1a143530565929390cadf036dc799 upstream.
The class of 4 n_hdls buf locks is the same because a single function
n_hdlc_buf_list_init is used to init all the locks. But since
flush_tx_queue takes n_hdlc->tx_buf_list.spinlock and then calls
n_hdlc_buf_put which takes n_hdlc->tx_free_buf_list.spinlock, lockdep
emits a warning:
=============================================
[ INFO: possible recursive locking detected ]
4.3.0-25.g91e30a7-default #1 Not tainted
---------------------------------------------
a.out/1248 is trying to acquire lock:
(&(&list->spinlock)->rlock){......}, at: [<
ffffffffa01fd020>] n_hdlc_buf_put+0x20/0x60 [n_hdlc]
but task is already holding lock:
(&(&list->spinlock)->rlock){......}, at: [<
ffffffffa01fdc07>] n_hdlc_tty_ioctl+0x127/0x1d0 [n_hdlc]
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0
----
lock(&(&list->spinlock)->rlock);
lock(&(&list->spinlock)->rlock);
*** DEADLOCK ***
May be due to missing lock nesting notation
2 locks held by a.out/1248:
#0: (&tty->ldisc_sem){++++++}, at: [<
ffffffff814c9eb0>] tty_ldisc_ref_wait+0x20/0x50
#1: (&(&list->spinlock)->rlock){......}, at: [<
ffffffffa01fdc07>] n_hdlc_tty_ioctl+0x127/0x1d0 [n_hdlc]
...
Call Trace:
...
[<
ffffffff81738fd0>] _raw_spin_lock_irqsave+0x50/0x70
[<
ffffffffa01fd020>] n_hdlc_buf_put+0x20/0x60 [n_hdlc]
[<
ffffffffa01fdc24>] n_hdlc_tty_ioctl+0x144/0x1d0 [n_hdlc]
[<
ffffffff814c25c1>] tty_ioctl+0x3f1/0xe40
...
Fix it by initializing the spin_locks separately. This removes also
reduntand memset of a freshly kzallocated space.
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Willy Tarreau <w@1wt.eu>
David Hildenbrand [Thu, 23 Mar 2017 17:24:19 +0000 (18:24 +0100)]
KVM: kvm_io_bus_unregister_dev() should never fail
commit
90db10434b163e46da413d34db8d0e77404cc645 upstream.
No caller currently checks the return value of
kvm_io_bus_unregister_dev(). This is evil, as all callers silently go on
freeing their device. A stale reference will remain in the io_bus,
getting at least used again, when the iobus gets teared down on
kvm_destroy_vm() - leading to use after free errors.
There is nothing the callers could do, except retrying over and over
again.
So let's simply remove the bus altogether, print an error and make
sure no one can access this broken bus again (returning -ENOMEM on any
attempt to access it).
Fixes:
e93f8a0f821e ("KVM: convert io_bus to SRCU")
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
[wt: no kvm_io_bus_read_cookie in 3.10, slightly different constructs]
Signed-off-by: Willy Tarreau <w@1wt.eu>
Amos Kong [Fri, 24 May 2013 22:44:15 +0000 (06:44 +0800)]
kvm: exclude ioeventfd from counting kvm_io_range limit
commit
6ea34c9b78c10289846db0abeebd6b84d5aca084 upstream.
We can easily reach the 1000 limit by start VM with a couple
hundred I/O devices (multifunction=on). The hardcode limit
already been adjusted 3 times (6 ~ 200 ~ 300 ~ 1000).
In userspace, we already have maximum file descriptor to
limit ioeventfd count. But kvm_io_bus devices also are used
for pit, pic, ioapic, coalesced_mmio. They couldn't be limited
by maximum file descriptor.
Currently only ioeventfds take too much kvm_io_bus devices,
so just exclude it from counting kvm_io_range limit.
Also fixed one indent issue in kvm_host.h
Signed-off-by: Amos Kong <akong@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
[wt: next patch depends on this one]
Signed-off-by: Willy Tarreau <w@1wt.eu>
Peter Xu [Wed, 15 Mar 2017 08:01:17 +0000 (16:01 +0800)]
KVM: x86: clear bus pointer when destroyed
commit
df630b8c1e851b5e265dc2ca9c87222e342c093b upstream.
When releasing the bus, let's clear the bus pointers to mark it out. If
any further device unregister happens on this bus, we know that we're
done if we found the bus being released already.
Signed-off-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Radim KrÄ\8dmáÅ\99 <rkrcmar@redhat.com>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Marcelo Ricardo Leitner [Thu, 23 Feb 2017 12:31:18 +0000 (09:31 -0300)]
sctp: deny peeloff operation on asocs with threads sleeping on it
commit
dfcb9f4f99f1e9a49e43398a7bfbf56927544af1 upstream.
commit
2dcab5984841 ("sctp: avoid BUG_ON on sctp_wait_for_sndbuf")
attempted to avoid a BUG_ON call when the association being used for a
sendmsg() is blocked waiting for more sndbuf and another thread did a
peeloff operation on such asoc, moving it to another socket.
As Ben Hutchings noticed, then in such case it would return without
locking back the socket and would cause two unlocks in a row.
Further analysis also revealed that it could allow a double free if the
application managed to peeloff the asoc that is created during the
sendmsg call, because then sctp_sendmsg() would try to free the asoc
that was created only for that call.
This patch takes another approach. It will deny the peeloff operation
if there is a thread sleeping on the asoc, so this situation doesn't
exist anymore. This avoids the issues described above and also honors
the syscalls that are already being handled (it can be multiple sendmsg
calls).
Joint work with Xin Long.
Fixes:
2dcab5984841 ("sctp: avoid BUG_ON on sctp_wait_for_sndbuf")
Cc: Alexander Popov <alex.popov@linux.com>
Cc: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Marcelo Ricardo Leitner [Mon, 6 Feb 2017 20:10:31 +0000 (18:10 -0200)]
sctp: avoid BUG_ON on sctp_wait_for_sndbuf
commit
2dcab598484185dea7ec22219c76dcdd59e3cb90 upstream.
Alexander Popov reported that an application may trigger a BUG_ON in
sctp_wait_for_sndbuf if the socket tx buffer is full, a thread is
waiting on it to queue more data and meanwhile another thread peels off
the association being used by the first thread.
This patch replaces the BUG_ON call with a proper error handling. It
will return -EPIPE to the original sendmsg call, similarly to what would
have been done if the association wasn't found in the first place.
Acked-by: Alexander Popov <alex.popov@linux.com>
Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Reviewed-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Li RongQing [Thu, 2 Jan 2014 05:20:12 +0000 (13:20 +0800)]
ipv6: fix the use of pcpu_tstats in ip6_tunnel
commit
abb6013cca147ad940b0e9fee260d2d9e93b7018 upstream.
when read/write the 64bit data, the correct lock should be hold.
Fixes:
87b6d218f3adb ("tunnel: implement 64 bits statistics")
Cc: Stephen Hemminger <stephen@networkplumber.org>
Cc: Eric Dumazet <edumazet@google.com>
Signed-off-by: Li RongQing <roy.qing.li@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Dan Carpenter [Wed, 1 Feb 2017 08:46:32 +0000 (11:46 +0300)]
ipv6: pointer math error in ip6_tnl_parse_tlv_enc_lim()
commit
63117f09c768be05a0bf465911297dc76394f686 upstream.
Casting is a high precedence operation but "off" and "i" are in terms of
bytes so we need to have some parenthesis here.
Fixes:
fbfa743a9d2a ("ipv6: fix ip6_tnl_parse_tlv_enc_lim()")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Eric Dumazet [Tue, 24 Jan 2017 00:43:06 +0000 (16:43 -0800)]
ipv6: fix ip6_tnl_parse_tlv_enc_lim()
commit
fbfa743a9d2a0ffa24251764f10afc13eb21e739 upstream.
This function suffers from multiple issues.
First one is that pskb_may_pull() may reallocate skb->head,
so the 'raw' pointer needs either to be reloaded or not used at all.
Second issue is that NEXTHDR_DEST handling does not validate
that the options are present in skb->data, so we might read
garbage or access non existent memory.
With help from Willem de Bruijn.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Cc: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Takashi Iwai [Thu, 17 Nov 2016 09:49:31 +0000 (10:49 +0100)]
xc2028: Fix use-after-free bug properly
commit
22a1e7783e173ab3d86018eb590107d68df46c11 upstream.
The commit
8dfbcc4351a0 ("[media] xc2028: avoid use after free") tried
to address the reported use-after-free by clearing the reference.
However, it's clearing the wrong pointer; it sets NULL to
priv->ctrl.fname, but it's anyway overwritten by the next line
memcpy(&priv->ctrl, p, sizeof(priv->ctrl)).
OTOH, the actual code accessing the freed string is the strcmp() call
with priv->fname:
if (!firmware_name[0] && p->fname &&
priv->fname && strcmp(p->fname, priv->fname))
free_firmware(priv);
where priv->fname points to the previous file name, and this was
already freed by kfree().
For fixing the bug properly, this patch does the following:
- Keep the copy of firmware file name in only priv->fname,
priv->ctrl.fname isn't changed;
- The allocation is done only when the firmware gets loaded;
- The kfree() is called in free_firmware() commonly
Fixes: commit
8dfbcc4351a0 ('[media] xc2028: avoid use after free')
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Dan Carpenter [Wed, 3 Feb 2016 15:34:00 +0000 (13:34 -0200)]
xc2028: unlock on error in xc2028_set_config()
commit
210bd104c6acd31c3c6b8b075b3f12d4a9f6b60d upstream.
We have to unlock before returning -ENOMEM.
Fixes:
8dfbcc4351a0 ('[media] xc2028: avoid use after free')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Mauro Carvalho Chehab [Thu, 28 Jan 2016 11:22:44 +0000 (09:22 -0200)]
xc2028: avoid use after free
commit
8dfbcc4351a0b6d2f2d77f367552f48ffefafe18 upstream.
If struct xc2028_config is passed without a firmware name,
the following trouble may happen:
[11009.907205] xc2028 5-0061: type set to XCeive xc2028/xc3028 tuner
[11009.907491] ==================================================================
[11009.907750] BUG: KASAN: use-after-free in strcmp+0x96/0xb0 at addr
ffff8803bd78ab40
[11009.907992] Read of size 1 by task modprobe/28992
[11009.907994] =============================================================================
[11009.907997] BUG kmalloc-16 (Tainted: G W ): kasan: bad access detected
[11009.907999] -----------------------------------------------------------------------------
[11009.908008] INFO: Allocated in xhci_urb_enqueue+0x214/0x14c0 [xhci_hcd] age=0 cpu=3 pid=28992
[11009.908012] ___slab_alloc+0x581/0x5b0
[11009.908014] __slab_alloc+0x51/0x90
[11009.908017] __kmalloc+0x27b/0x350
[11009.908022] xhci_urb_enqueue+0x214/0x14c0 [xhci_hcd]
[11009.908026] usb_hcd_submit_urb+0x1e8/0x1c60
[11009.908029] usb_submit_urb+0xb0e/0x1200
[11009.908032] usb_serial_generic_write_start+0xb6/0x4c0
[11009.908035] usb_serial_generic_write+0x92/0xc0
[11009.908039] usb_console_write+0x38a/0x560
[11009.908045] call_console_drivers.constprop.14+0x1ee/0x2c0
[11009.908051] console_unlock+0x40d/0x900
[11009.908056] vprintk_emit+0x4b4/0x830
[11009.908061] vprintk_default+0x1f/0x30
[11009.908064] printk+0x99/0xb5
[11009.908067] kasan_report_error+0x10a/0x550
[11009.908070] __asan_report_load1_noabort+0x43/0x50
[11009.908074] INFO: Freed in xc2028_set_config+0x90/0x630 [tuner_xc2028] age=1 cpu=3 pid=28992
[11009.908077] __slab_free+0x2ec/0x460
[11009.908080] kfree+0x266/0x280
[11009.908083] xc2028_set_config+0x90/0x630 [tuner_xc2028]
[11009.908086] xc2028_attach+0x310/0x8a0 [tuner_xc2028]
[11009.908090] em28xx_attach_xc3028.constprop.7+0x1f9/0x30d [em28xx_dvb]
[11009.908094] em28xx_dvb_init.part.3+0x8e4/0x5cf4 [em28xx_dvb]
[11009.908098] em28xx_dvb_init+0x81/0x8a [em28xx_dvb]
[11009.908101] em28xx_register_extension+0xd9/0x190 [em28xx]
[11009.908105] em28xx_dvb_register+0x10/0x1000 [em28xx_dvb]
[11009.908108] do_one_initcall+0x141/0x300
[11009.908111] do_init_module+0x1d0/0x5ad
[11009.908114] load_module+0x6666/0x9ba0
[11009.908117] SyS_finit_module+0x108/0x130
[11009.908120] entry_SYSCALL_64_fastpath+0x16/0x76
[11009.908123] INFO: Slab 0xffffea000ef5e280 objects=25 used=25 fp=0x (null) flags=0x2ffff8000004080
[11009.908126] INFO: Object 0xffff8803bd78ab40 @offset=2880 fp=0x0000000000000001
[11009.908130] Bytes b4
ffff8803bd78ab30: 01 00 00 00 2a 07 00 00 9d 28 00 00 01 00 00 00 ....*....(......
[11009.908133] Object
ffff8803bd78ab40: 01 00 00 00 00 00 00 00 b0 1d c3 6a 00 88 ff ff ...........j....
[11009.908137] CPU: 3 PID: 28992 Comm: modprobe Tainted: G B W 4.5.0-rc1+ #43
[11009.908140] Hardware name: /NUC5i7RYB, BIOS RYBDWi35.86A.0350.2015.0812.1722 08/12/2015
[11009.908142]
ffff8803bd78a000 ffff8802c273f1b8 ffffffff81932007 ffff8803c6407a80
[11009.908148]
ffff8802c273f1e8 ffffffff81556759 ffff8803c6407a80 ffffea000ef5e280
[11009.908153]
ffff8803bd78ab40 dffffc0000000000 ffff8802c273f210 ffffffff8155ccb4
[11009.908158] Call Trace:
[11009.908162] [<
ffffffff81932007>] dump_stack+0x4b/0x64
[11009.908165] [<
ffffffff81556759>] print_trailer+0xf9/0x150
[11009.908168] [<
ffffffff8155ccb4>] object_err+0x34/0x40
[11009.908171] [<
ffffffff8155f260>] kasan_report_error+0x230/0x550
[11009.908175] [<
ffffffff81237d71>] ? trace_hardirqs_off_caller+0x21/0x290
[11009.908179] [<
ffffffff8155e926>] ? kasan_unpoison_shadow+0x36/0x50
[11009.908182] [<
ffffffff8155f5c3>] __asan_report_load1_noabort+0x43/0x50
[11009.908185] [<
ffffffff8155ea00>] ? __asan_register_globals+0x50/0xa0
[11009.908189] [<
ffffffff8194cea6>] ? strcmp+0x96/0xb0
[11009.908192] [<
ffffffff8194cea6>] strcmp+0x96/0xb0
[11009.908196] [<
ffffffffa13ba4ac>] xc2028_set_config+0x15c/0x630 [tuner_xc2028]
[11009.908200] [<
ffffffffa13bac90>] xc2028_attach+0x310/0x8a0 [tuner_xc2028]
[11009.908203] [<
ffffffff8155ea78>] ? memset+0x28/0x30
[11009.908206] [<
ffffffffa13ba980>] ? xc2028_set_config+0x630/0x630 [tuner_xc2028]
[11009.908211] [<
ffffffffa157a59a>] em28xx_attach_xc3028.constprop.7+0x1f9/0x30d [em28xx_dvb]
[11009.908215] [<
ffffffffa157aa2a>] ? em28xx_dvb_init.part.3+0x37c/0x5cf4 [em28xx_dvb]
[11009.908219] [<
ffffffffa157a3a1>] ? hauppauge_hvr930c_init+0x487/0x487 [em28xx_dvb]
[11009.908222] [<
ffffffffa01795ac>] ? lgdt330x_attach+0x1cc/0x370 [lgdt330x]
[11009.908226] [<
ffffffffa01793e0>] ? i2c_read_demod_bytes.isra.2+0x210/0x210 [lgdt330x]
[11009.908230] [<
ffffffff812e87d0>] ? ref_module.part.15+0x10/0x10
[11009.908233] [<
ffffffff812e56e0>] ? module_assert_mutex_or_preempt+0x80/0x80
[11009.908238] [<
ffffffffa157af92>] em28xx_dvb_init.part.3+0x8e4/0x5cf4 [em28xx_dvb]
[11009.908242] [<
ffffffffa157a6ae>] ? em28xx_attach_xc3028.constprop.7+0x30d/0x30d [em28xx_dvb]
[11009.908245] [<
ffffffff8195222d>] ? string+0x14d/0x1f0
[11009.908249] [<
ffffffff8195381f>] ? symbol_string+0xff/0x1a0
[11009.908253] [<
ffffffff81953720>] ? uuid_string+0x6f0/0x6f0
[11009.908257] [<
ffffffff811a775e>] ? __kernel_text_address+0x7e/0xa0
[11009.908260] [<
ffffffff8104b02f>] ? print_context_stack+0x7f/0xf0
[11009.908264] [<
ffffffff812e9846>] ? __module_address+0xb6/0x360
[11009.908268] [<
ffffffff8137fdc9>] ? is_ftrace_trampoline+0x99/0xe0
[11009.908271] [<
ffffffff811a775e>] ? __kernel_text_address+0x7e/0xa0
[11009.908275] [<
ffffffff81240a70>] ? debug_check_no_locks_freed+0x290/0x290
[11009.908278] [<
ffffffff8104a24b>] ? dump_trace+0x11b/0x300
[11009.908282] [<
ffffffffa13e8143>] ? em28xx_register_extension+0x23/0x190 [em28xx]
[11009.908285] [<
ffffffff81237d71>] ? trace_hardirqs_off_caller+0x21/0x290
[11009.908289] [<
ffffffff8123ff56>] ? trace_hardirqs_on_caller+0x16/0x590
[11009.908292] [<
ffffffff812404dd>] ? trace_hardirqs_on+0xd/0x10
[11009.908296] [<
ffffffffa13e8143>] ? em28xx_register_extension+0x23/0x190 [em28xx]
[11009.908299] [<
ffffffff822dcbb0>] ? mutex_trylock+0x400/0x400
[11009.908302] [<
ffffffff810021a1>] ? do_one_initcall+0x131/0x300
[11009.908306] [<
ffffffff81296dc7>] ? call_rcu_sched+0x17/0x20
[11009.908309] [<
ffffffff8159e708>] ? put_object+0x48/0x70
[11009.908314] [<
ffffffffa1579f11>] em28xx_dvb_init+0x81/0x8a [em28xx_dvb]
[11009.908317] [<
ffffffffa13e81f9>] em28xx_register_extension+0xd9/0x190 [em28xx]
[11009.908320] [<
ffffffffa0150000>] ? 0xffffffffa0150000
[11009.908324] [<
ffffffffa0150010>] em28xx_dvb_register+0x10/0x1000 [em28xx_dvb]
[11009.908327] [<
ffffffff810021b1>] do_one_initcall+0x141/0x300
[11009.908330] [<
ffffffff81002070>] ? try_to_run_init_process+0x40/0x40
[11009.908333] [<
ffffffff8123ff56>] ? trace_hardirqs_on_caller+0x16/0x590
[11009.908337] [<
ffffffff8155e926>] ? kasan_unpoison_shadow+0x36/0x50
[11009.908340] [<
ffffffff8155e926>] ? kasan_unpoison_shadow+0x36/0x50
[11009.908343] [<
ffffffff8155e926>] ? kasan_unpoison_shadow+0x36/0x50
[11009.908346] [<
ffffffff8155ea37>] ? __asan_register_globals+0x87/0xa0
[11009.908350] [<
ffffffff8144da7b>] do_init_module+0x1d0/0x5ad
[11009.908353] [<
ffffffff812f2626>] load_module+0x6666/0x9ba0
[11009.908356] [<
ffffffff812e9c90>] ? symbol_put_addr+0x50/0x50
[11009.908361] [<
ffffffffa1580037>] ? em28xx_dvb_init.part.3+0x5989/0x5cf4 [em28xx_dvb]
[11009.908366] [<
ffffffff812ebfc0>] ? module_frob_arch_sections+0x20/0x20
[11009.908369] [<
ffffffff815bc940>] ? open_exec+0x50/0x50
[11009.908374] [<
ffffffff811671bb>] ? ns_capable+0x5b/0xd0
[11009.908377] [<
ffffffff812f5e58>] SyS_finit_module+0x108/0x130
[11009.908379] [<
ffffffff812f5d50>] ? SyS_init_module+0x1f0/0x1f0
[11009.908383] [<
ffffffff81004044>] ? lockdep_sys_exit_thunk+0x12/0x14
[11009.908394] [<
ffffffff822e6936>] entry_SYSCALL_64_fastpath+0x16/0x76
[11009.908396] Memory state around the buggy address:
[11009.908398]
ffff8803bd78aa00: 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[11009.908401]
ffff8803bd78aa80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[11009.908403] >
ffff8803bd78ab00: fc fc fc fc fc fc fc fc 00 00 fc fc fc fc fc fc
[11009.908405] ^
[11009.908407]
ffff8803bd78ab80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[11009.908409]
ffff8803bd78ac00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[11009.908411] ==================================================================
In order to avoid it, let's set the cached value of the firmware
name to NULL after freeing it. While here, return an error if
the memory allocation fails.
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Vitaly Kuznetsov [Sat, 4 Jun 2016 00:09:22 +0000 (17:09 -0700)]
Drivers: hv: avoid vfree() on crash
commit
a9f61ca793becabdefab03b77568d6c6f8c1bc79 upstream.
When we crash from NMI context (e.g. after NMI injection from host when
'sysctl -w kernel.unknown_nmi_panic=1' is set) we hit
kernel BUG at mm/vmalloc.c:1530!
as vfree() is denied. While the issue could be solved with in_nmi() check
instead I opted for skipping vfree on all sorts of crashes to reduce the
amount of work which can cause consequent crashes. We don't really need to
free anything on crash.
[js] no tsc and kexec in 3.12 yet
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Eric Dumazet [Fri, 27 Jan 2017 16:11:44 +0000 (08:11 -0800)]
can: Fix kernel panic at security_sock_rcv_skb
commit
f1712c73714088a7252d276a57126d56c7d37e64 upstream.
Zhang Yanmin reported crashes [1] and provided a patch adding a
synchronize_rcu() call in can_rx_unregister()
The main problem seems that the sockets themselves are not RCU
protected.
If CAN uses RCU for delivery, then sockets should be freed only after
one RCU grace period.
Recent kernels could use sock_set_flag(sk, SOCK_RCU_FREE), but let's
ease stable backports with the following fix instead.
[1]
BUG: unable to handle kernel NULL pointer dereference at (null)
IP: [<
ffffffff81495e25>] selinux_socket_sock_rcv_skb+0x65/0x2a0
Call Trace:
<IRQ>
[<
ffffffff81485d8c>] security_sock_rcv_skb+0x4c/0x60
[<
ffffffff81d55771>] sk_filter+0x41/0x210
[<
ffffffff81d12913>] sock_queue_rcv_skb+0x53/0x3a0
[<
ffffffff81f0a2b3>] raw_rcv+0x2a3/0x3c0
[<
ffffffff81f06eab>] can_rcv_filter+0x12b/0x370
[<
ffffffff81f07af9>] can_receive+0xd9/0x120
[<
ffffffff81f07beb>] can_rcv+0xab/0x100
[<
ffffffff81d362ac>] __netif_receive_skb_core+0xd8c/0x11f0
[<
ffffffff81d36734>] __netif_receive_skb+0x24/0xb0
[<
ffffffff81d37f67>] process_backlog+0x127/0x280
[<
ffffffff81d36f7b>] net_rx_action+0x33b/0x4f0
[<
ffffffff810c88d4>] __do_softirq+0x184/0x440
[<
ffffffff81f9e86c>] do_softirq_own_stack+0x1c/0x30
<EOI>
[<
ffffffff810c76fb>] do_softirq.part.18+0x3b/0x40
[<
ffffffff810c8bed>] do_softirq+0x1d/0x20
[<
ffffffff81d30085>] netif_rx_ni+0xe5/0x110
[<
ffffffff8199cc87>] slcan_receive_buf+0x507/0x520
[<
ffffffff8167ef7c>] flush_to_ldisc+0x21c/0x230
[<
ffffffff810e3baf>] process_one_work+0x24f/0x670
[<
ffffffff810e44ed>] worker_thread+0x9d/0x6f0
[<
ffffffff810e4450>] ? rescuer_thread+0x480/0x480
[<
ffffffff810ebafc>] kthread+0x12c/0x150
[<
ffffffff81f9ccef>] ret_from_fork+0x3f/0x70
Reported-by: Zhang Yanmin <yanmin.zhang@intel.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Oliver O'Halloran [Tue, 26 Jul 2016 22:22:17 +0000 (15:22 -0700)]
mm/init: fix zone boundary creation
commit
90cae1fe1c3540f791d5b8e025985fa5e699b2bb upstream.
As a part of memory initialisation the architecture passes an array to
free_area_init_nodes() which specifies the max PFN of each memory zone.
This array is not necessarily monotonic (due to unused zones) so this
array is parsed to build monotonic lists of the min and max PFN for each
zone. ZONE_MOVABLE is special cased here as its limits are managed by
the mm subsystem rather than the architecture. Unfortunately, this
special casing is broken when ZONE_MOVABLE is the not the last zone in
the zone list. The core of the issue is:
if (i == ZONE_MOVABLE)
continue;
arch_zone_lowest_possible_pfn[i] =
arch_zone_highest_possible_pfn[i-1];
As ZONE_MOVABLE is skipped the lowest_possible_pfn of the next zone will
be set to zero. This patch fixes this bug by adding explicitly tracking
where the next zone should start rather than relying on the contents
arch_zone_highest_possible_pfn[].
Thie is low priority. To get bitten by this you need to enable a zone
that appears after ZONE_MOVABLE in the zone_type enum. As far as I can
tell this means running a kernel with ZONE_DEVICE or ZONE_CMA enabled,
so I can't see this affecting too many people.
I only noticed this because I've been fiddling with ZONE_DEVICE on
powerpc and 4.6 broke my test kernel. This bug, in conjunction with the
changes in Taku Izumi's kernelcore=mirror patch (
d91749c1dda71) and
powerpc being the odd architecture which initialises max_zone_pfn[] to
~0ul instead of 0 caused all of system memory to be placed into
ZONE_DEVICE at boot, followed a panic since device memory cannot be used
for kernel allocations. I've already submitted a patch to fix the
powerpc specific bits, but I figured this should be fixed too.
Link: http://lkml.kernel.org/r/1462435033-15601-1-git-send-email-oohall@gmail.com
Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
Cc: Anton Blanchard <anton@samba.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Mel Gorman <mgorman@techsingularity.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Alan Stern [Wed, 14 Dec 2016 19:55:56 +0000 (14:55 -0500)]
USB: dummy-hcd: fix bug in stop_activity (handle ep0)
commit
bcdbeb844773333d2d1c08004f3b3e25921040e5 upstream.
The stop_activity() routine in dummy-hcd is supposed to unlink all
active requests for every endpoint, among other things. But it
doesn't handle ep0. As a result, fuzz testing can generate a WARNING
like the following:
WARNING: CPU: 0 PID: 4410 at drivers/usb/gadget/udc/dummy_hcd.c:672 dummy_free_request+0x153/0x170
Modules linked in:
CPU: 0 PID: 4410 Comm: syz-executor Not tainted 4.9.0-rc7+ #32
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
ffff88006a64ed10 ffffffff81f96b8a ffffffff41b58ab3 1ffff1000d4c9d35
ffffed000d4c9d2d ffff880065f8ac00 0000000041b58ab3 ffffffff8598b510
ffffffff81f968f8 0000000041b58ab3 ffffffff859410e0 ffffffff813f0590
Call Trace:
[< inline >] __dump_stack lib/dump_stack.c:15
[<
ffffffff81f96b8a>] dump_stack+0x292/0x398 lib/dump_stack.c:51
[<
ffffffff812b808f>] __warn+0x19f/0x1e0 kernel/panic.c:550
[<
ffffffff812b831c>] warn_slowpath_null+0x2c/0x40 kernel/panic.c:585
[<
ffffffff830fcb13>] dummy_free_request+0x153/0x170 drivers/usb/gadget/udc/dummy_hcd.c:672
[<
ffffffff830ed1b0>] usb_ep_free_request+0xc0/0x420 drivers/usb/gadget/udc/core.c:195
[<
ffffffff83225031>] gadgetfs_unbind+0x131/0x190 drivers/usb/gadget/legacy/inode.c:1612
[<
ffffffff830ebd8f>] usb_gadget_remove_driver+0x10f/0x2b0 drivers/usb/gadget/udc/core.c:1228
[<
ffffffff830ec084>] usb_gadget_unregister_driver+0x154/0x240 drivers/usb/gadget/udc/core.c:1357
This patch fixes the problem by iterating over all the endpoints in
the driver's ep array instead of iterating over the gadget's ep_list,
which explicitly leaves out ep0.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Reported-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Alan Stern [Mon, 19 Dec 2016 17:03:41 +0000 (12:03 -0500)]
USB: fix problems with duplicate endpoint addresses
commit
0a8fd1346254974c3a852338508e4a4cddbb35f1 upstream.
When checking a new device's descriptors, the USB core does not check
for duplicate endpoint addresses. This can cause a problem when the
sysfs files for those endpoints are created; trying to create multiple
files with the same name will provoke a WARNING:
WARNING: CPU: 2 PID: 865 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x8a/0xa0
sysfs: cannot create duplicate filename
'/devices/platform/dummy_hcd.0/usb2/2-1/2-1:64.0/ep_05'
Kernel panic - not syncing: panic_on_warn set ...
CPU: 2 PID: 865 Comm: kworker/2:1 Not tainted 4.9.0-rc7+ #34
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
Workqueue: usb_hub_wq hub_event
ffff88006bee64c8 ffffffff81f96b8a ffffffff00000001 1ffff1000d7dcc2c
ffffed000d7dcc24 0000000000000001 0000000041b58ab3 ffffffff8598b510
ffffffff81f968f8 ffffffff850fee20 ffffffff85cff020 dffffc0000000000
Call Trace:
[< inline >] __dump_stack lib/dump_stack.c:15
[<
ffffffff81f96b8a>] dump_stack+0x292/0x398 lib/dump_stack.c:51
[<
ffffffff8168c88e>] panic+0x1cb/0x3a9 kernel/panic.c:179
[<
ffffffff812b80b4>] __warn+0x1c4/0x1e0 kernel/panic.c:542
[<
ffffffff812b8195>] warn_slowpath_fmt+0xc5/0x110 kernel/panic.c:565
[<
ffffffff819e70ca>] sysfs_warn_dup+0x8a/0xa0 fs/sysfs/dir.c:30
[<
ffffffff819e7308>] sysfs_create_dir_ns+0x178/0x1d0 fs/sysfs/dir.c:59
[< inline >] create_dir lib/kobject.c:71
[<
ffffffff81fa1b07>] kobject_add_internal+0x227/0xa60 lib/kobject.c:229
[< inline >] kobject_add_varg lib/kobject.c:366
[<
ffffffff81fa2479>] kobject_add+0x139/0x220 lib/kobject.c:411
[<
ffffffff82737a63>] device_add+0x353/0x1660 drivers/base/core.c:1088
[<
ffffffff82738d8d>] device_register+0x1d/0x20 drivers/base/core.c:1206
[<
ffffffff82cb77d3>] usb_create_ep_devs+0x163/0x260 drivers/usb/core/endpoint.c:195
[<
ffffffff82c9f27b>] create_intf_ep_devs+0x13b/0x200 drivers/usb/core/message.c:1030
[<
ffffffff82ca39d3>] usb_set_configuration+0x1083/0x18d0 drivers/usb/core/message.c:1937
[<
ffffffff82cc9e2e>] generic_probe+0x6e/0xe0 drivers/usb/core/generic.c:172
[<
ffffffff82caa7fa>] usb_probe_device+0xaa/0xe0 drivers/usb/core/driver.c:263
This patch prevents the problem by checking for duplicate endpoint
addresses during enumeration and skipping any duplicates.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Reported-by: Andrey Konovalov <andreyknvl@google.com>
Tested-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Eric Dumazet [Sat, 25 Mar 2017 02:36:13 +0000 (19:36 -0700)]
ping: implement proper locking
commit
43a6684519ab0a6c52024b5e25322476cabad893 upstream.
We got a report of yet another bug in ping
http://www.openwall.com/lists/oss-security/2017/03/24/6
->disconnect() is not called with socket lock held.
Fix this by acquiring ping rwlock earlier.
Thanks to Daniel, Alexander and Andrey for letting us know this problem.
Fixes:
c319b4d76b9e ("net: ipv4: add IPPROTO_ICMP socket kind")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Daniel Jiang <danieljiang0415@gmail.com>
Reported-by: Solar Designer <solar@openwall.com>
Reported-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
[wt: the function is ping_v4_unhash() in 3.10]
Signed-off-by: Willy Tarreau <w@1wt.eu>
Johan Hovold [Tue, 14 Mar 2017 16:55:45 +0000 (17:55 +0100)]
USB: usbtmc: add missing endpoint sanity check
commit
687e0687f71ec00e0132a21fef802dee88c2f1ad upstream.
USBTMC devices are required to have a bulk-in and a bulk-out endpoint,
but the driver failed to verify this, something which could lead to the
endpoint addresses being taken from uninitialised memory.
Make sure to zero all private data as part of allocation, and add the
missing endpoint sanity check.
Note that this also addresses a more recently introduced issue, where
the interrupt-in-presence flag would also be uninitialised whenever the
optional interrupt-in endpoint is not present. This in turn could lead
to an interrupt urb being allocated, initialised and submitted based on
uninitialised values.
Fixes:
dbf3e7f654c0 ("Implement an ioctl to support the USMTMC-USB488 READ_STATUS_BYTE operation.")
Fixes:
5b775f672cc9 ("USB: add USB test and measurement class driver")
Signed-off-by: Johan Hovold <johan@kernel.org>
[ johan: backport to v4.4 ]
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Arnaldo Carvalho de Melo [Tue, 18 Oct 2016 14:28:32 +0000 (11:28 -0300)]
perf trace: Use the syscall raw_syscalls:sys_enter timestamp
commit
ecf1e2253ea79c6204f4d6a5e756e8fb4aed5a7e upstream.
Instead of the one when another syscall takes place while another is being
processed (in another CPU, but we show it serialized, so need to "interrupt"
the other), and also when finally showing the sys_enter + sys_exit + duration,
where we were showing the sample->time for the sys_exit, duh.
Before:
# perf trace sleep 1
<SNIP>
0.373 ( 0.001 ms): close(fd: 3 ) = 0
1000.626 (1000.211 ms): nanosleep(rqtp: 0x7ffd6ddddfb0) = 0
1000.653 ( 0.003 ms): close(fd: 1 ) = 0
1000.657 ( 0.002 ms): close(fd: 2 ) = 0
1000.667 ( 0.000 ms): exit_group( )
#
After:
# perf trace sleep 1
<SNIP>
0.336 ( 0.001 ms): close(fd: 3 ) = 0
0.373 (1000.086 ms): nanosleep(rqtp: 0x7ffe303e9550) = 0
1000.481 ( 0.002 ms): close(fd: 1 ) = 0
1000.485 ( 0.001 ms): close(fd: 2 ) = 0
1000.494 ( 0.000 ms): exit_group( )
[root@jouet linux]#
[js] no trace__printf_interrupted_entry in 3.12 yet
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-ecbzgmu2ni6glc6zkw8p1zmx@git.kernel.org
Fixes:
752fde44fd1c ("perf trace: Support interrupted syscalls")
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
[wt: 3.10 uses stdout instead of trace->output ;
no trace__printf_interrupted_entry() function ]
Signed-off-by: Willy Tarreau <w@1wt.eu>
Daniel Borkmann [Thu, 20 Feb 2014 19:51:06 +0000 (20:51 +0100)]
net: sctp: rework multihoming retransmission path selection to rfc4960
commit
4c47af4d5eb2c2f78f886079a3920a7078a6f0a0 upstream.
Problem statement: 1) both paths (primary path1 and alternate
path2) are up after the association has been established i.e.,
HB packets are normally exchanged, 2) path2 gets inactive after
path_max_retrans * max_rto timed out (i.e. path2 is down completely),
3) now, if a transmission times out on the only surviving/active
path1 (any ~1sec network service impact could cause this like
a channel bonding failover), then the retransmitted packets are
sent over the inactive path2; this happens with partial failover
and without it.
Besides not being optimal in the above scenario, a small failure
or timeout in the only existing path has the potential to cause
long delays in the retransmission (depending on RTO_MAX) until
the still active path is reselected. Further, when the T3-timeout
occurs, we have active_patch == retrans_path, and even though the
timeout occurred on the initial transmission of data, not a
retransmit, we end up updating retransmit path.
RFC4960, section 6.4. "Multi-Homed SCTP Endpoints" states under
6.4.1. "Failover from an Inactive Destination Address" the
following:
Some of the transport addresses of a multi-homed SCTP endpoint
may become inactive due to either the occurrence of certain
error conditions (see Section 8.2) or adjustments from the
SCTP user.
When there is outbound data to send and the primary path
becomes inactive (e.g., due to failures), or where the SCTP
user explicitly requests to send data to an inactive
destination transport address, before reporting an error to
its ULP, the SCTP endpoint should try to send the data to an
alternate __active__ destination transport address if one
exists.
When retransmitting data that timed out, if the endpoint is
multihomed, it should consider each source-destination address
pair in its retransmission selection policy. When retransmitting
timed-out data, the endpoint should attempt to pick the most
divergent source-destination pair from the original
source-destination pair to which the packet was transmitted.
Note: Rules for picking the most divergent source-destination
pair are an implementation decision and are not specified
within this document.
So, we should first reconsider to take the current active
retransmission transport if we cannot find an alternative
active one. If all of that fails, we can still round robin
through unkown, partial failover, and inactive ones in the
hope to find something still suitable.
Commit
4141ddc02a92 ("sctp: retran_path update bug fix") broke
that behaviour by selecting the next inactive transport when
no other active transport was found besides the current assoc's
peer.retran_path. Before commit
4141ddc02a92, we would have
traversed through the list until we reach our peer.retran_path
again, and in case that is still in state SCTP_ACTIVE, we would
take it and return. Only if that is not the case either, we
take the next inactive transport.
Besides all that, another issue is that transports in state
SCTP_UNKNOWN could be preferred over transports in state
SCTP_ACTIVE in case a SCTP_ACTIVE transport appears after
SCTP_UNKNOWN in the transport list yielding a weaker transport
state to be used in retransmission.
This patch mostly reverts
4141ddc02a92, but also rewrites
this function to introduce more clarity and strictness into
the code. A strict priority of transport states is enforced
in this patch, hence selection is active > unkown > partial
failover > inactive.
Fixes:
4141ddc02a92 ("sctp: retran_path update bug fix")
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Cc: Gui Jianfeng <guijianfeng@cn.fujitsu.com>
Acked-by: Vlad Yasevich <yasevich@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
[wt: picked updated function from 3.12 except the debug statement]
Signed-off-by: Willy Tarreau <w@1wt.eu>
Dan Carpenter [Thu, 7 Nov 2013 07:55:43 +0000 (10:55 +0300)]
Staging: vt6655-6: potential NULL dereference in hostap_disable_hostapd()
commit
cb4855b49deb1acce27706ad9509d63c4fe8e988 upstream.
We fixed this to use free_netdev() instead of kfree() but unfortunately
free_netdev() doesn't accept NULL pointers. Smatch complains about
this, it's not something I discovered through testing.
Fixes:
3030d40b5036 ('staging: vt6655: use free_netdev instead of kfree')
Fixes:
0a438d5b381e ('staging: vt6656: use free_netdev instead of kfree')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[wt: only vt6656 was converted to free_netdev in 3.10]
Signed-off-by: Willy Tarreau <w@1wt.eu>
Herbert Xu [Sun, 2 Nov 2014 20:30:14 +0000 (04:30 +0800)]
tun: Fix TUN_PKT_STRIP setting
commit
2eb783c43e7cf807a45899c10ed556b6dc116625 upstream.
We set the flag TUN_PKT_STRIP if the user buffer provided is too
small to contain the entire packet plus meta-data. However, this
has been broken ever since we added GSO meta-data. VLAN acceleration
also has the same problem.
This patch fixes this by taking both into account when setting the
TUN_PKT_STRIP flag.
The fact that this has been broken for six years without anyone
realising means that nobody actually uses this flag.
Fixes:
f43798c27684 ("tun: Allow GSO using virtio_net_hdr")
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
[wt: no tuntap VLAN offloading in 3.10]
Signed-off-by: Willy Tarreau <w@1wt.eu>
Vladimir Zapolskiy [Thu, 17 Nov 2016 01:30:51 +0000 (03:30 +0200)]
ARM: dts: imx31: fix AVIC base address
commit
af92305e567b7f4c9cf48b9e46c1f48ec9ffb1fb upstream.
On i.MX31 AVIC interrupt controller base address is at 0x68000000.
The problem was shadowed by the AVIC driver, which takes the correct
base address from a SoC specific header file.
Fixes:
d2a37b3d91f4 ("ARM i.MX31: Add devicetree support")
Signed-off-by: Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Vladimir Zapolskiy [Mon, 26 Sep 2016 00:03:41 +0000 (03:03 +0300)]
ARM: dts: imx31: move CCM device node to AIPS2 bus devices
commit
1f87aee6a2e55eda466a43ba6248a8b75eede153 upstream.
i.MX31 Clock Control Module controller is found on AIPS2 bus, move it
there from SPBA bus to avoid a conflict of device IO space mismatch.
Fixes:
ef0e4a606fb6 ("ARM: mx31: Replace clk_register_clkdev with clock DT lookup")
Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Signed-off-by: Willy Tarreau <w@1wt.eu>
James Hogan [Thu, 30 Mar 2017 15:06:02 +0000 (16:06 +0100)]
MIPS: KGDB: Use kernel context for sleeping threads
commit
162b270c664dca2e0944308e92f9fcc887151a72 upstream.
KGDB is a kernel debug stub and it can't be used to debug userland as it
can only safely access kernel memory.
On MIPS however KGDB has always got the register state of sleeping
processes from the userland register context at the beginning of the
kernel stack. This is meaningless for kernel threads (which never enter
userland), and for user threads it prevents the user seeing what it is
doing while in the kernel:
(gdb) info threads
Id Target Id Frame
...
3 Thread 2 (kthreadd) 0x0000000000000000 in ?? ()
2 Thread 1 (init) 0x000000007705c4b4 in ?? ()
1 Thread -2 (shadowCPU0) 0xffffffff8012524c in arch_kgdb_breakpoint () at arch/mips/kernel/kgdb.c:201
Get the register state instead from the (partial) kernel register
context stored in the task's thread_struct for resume() to restore. All
threads now correctly appear to be in context_switch():
(gdb) info threads
Id Target Id Frame
...
3 Thread 2 (kthreadd) context_switch (rq=<optimized out>, cookie=..., next=<optimized out>, prev=0x0) at kernel/sched/core.c:2903
2 Thread 1 (init) context_switch (rq=<optimized out>, cookie=..., next=<optimized out>, prev=0x0) at kernel/sched/core.c:2903
1 Thread -2 (shadowCPU0) 0xffffffff8012524c in arch_kgdb_breakpoint () at arch/mips/kernel/kgdb.c:201
Call clobbered registers which aren't saved and exception registers
(BadVAddr & Cause) which can't be easily determined without stack
unwinding are reported as 0. The PC is taken from the return address,
such that the state presented matches that found immediately after
returning from resume().
Fixes:
8854700115ec ("[MIPS] kgdb: add arch support for the kernel's kgdb core")
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Jason Wessel <jason.wessel@windriver.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/15829/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Guillaume Nault [Mon, 3 Apr 2017 10:03:13 +0000 (12:03 +0200)]
l2tp: take reference on sessions being dumped
commit
e08293a4ccbcc993ded0fdc46f1e57926b833d63 upstream.
Take a reference on the sessions returned by l2tp_session_find_nth()
(and rename it l2tp_session_get_nth() to reflect this change), so that
caller is assured that the session isn't going to disappear while
processing it.
For procfs and debugfs handlers, the session is held in the .start()
callback and dropped in .show(). Given that pppol2tp_seq_session_show()
dereferences the associated PPPoL2TP socket and that
l2tp_dfs_seq_session_show() might call pppol2tp_show(), we also need to
call the session's .ref() callback to prevent the socket from going
away from under us.
Fixes:
fd558d186df2 ("l2tp: Split pppol2tp patch into separate l2tp and ppp parts")
Fixes:
0ad6614048cf ("l2tp: Add debugfs files for dumping l2tp debug info")
Fixes:
309795f4bec2 ("l2tp: Add netlink control API for L2TP")
Signed-off-by: Guillaume Nault <g.nault@alphalink.fr>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Nathan Sullivan [Wed, 22 Mar 2017 20:27:01 +0000 (15:27 -0500)]
net: phy: handle state correctly in phy_stop_machine
commit
49d52e8108a21749dc2114b924c907db43358984 upstream.
If the PHY is halted on stop, then do not set the state to PHY_UP. This
ensures the phy will be restarted later in phy_start when the machine is
started again.
Fixes:
00db8189d984 ("This patch adds a PHY Abstraction Layer to the Linux Kernel, enabling ethernet drivers to remain as ignorant as is reasonable of the connected PHY's design and operation details.")
Signed-off-by: Nathan Sullivan <nathan.sullivan@ni.com>
Signed-off-by: Brad Mouring <brad.mouring@ni.com>
Acked-by: Xander Huff <xander.huff@ni.com>
Acked-by: Kyle Roeschley <kyle.roeschley@ni.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Hongxu Jia [Wed, 30 Nov 2016 02:56:26 +0000 (21:56 -0500)]
netfilter: arp_tables: fix invoking 32bit "iptable -P INPUT ACCEPT" failed in 64bit kernel
commit
17a49cd549d9dc8707dc9262210166455c612dde upstream.
Since
09d9686047db ("netfilter: x_tables: do compat validation via
translate_table"), it used compatr structure to assign newinfo
structure. In translate_compat_table of ip_tables.c and ip6_tables.c,
it used compatr->hook_entry to replace info->hook_entry and
compatr->underflow to replace info->underflow, but not do the same
replacement in arp_tables.c.
It caused invoking 32-bit "arptbale -P INPUT ACCEPT" failed in 64bit
kernel.
--------------------------------------
root@qemux86-64:~# arptables -P INPUT ACCEPT
root@qemux86-64:~# arptables -P INPUT ACCEPT
ERROR: Policy for `INPUT' offset 448 != underflow 0
arptables: Incompatible with this kernel
--------------------------------------
Fixes:
09d9686047db ("netfilter: x_tables: do compat validation via translate_table")
Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com>
Acked-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Steven Rostedt (VMware) [Wed, 19 Apr 2017 18:29:46 +0000 (14:29 -0400)]
ring-buffer: Have ring_buffer_iter_empty() return true when empty
commit
78f7a45dac2a2d2002f98a3a95f7979867868d73 upstream.
I noticed that reading the snapshot file when it is empty no longer gives a
status. It suppose to show the status of the snapshot buffer as well as how
to allocate and use it. For example:
># cat snapshot
# tracer: nop
#
#
# * Snapshot is allocated *
#
# Snapshot commands:
# echo 0 > snapshot : Clears and frees snapshot buffer
# echo 1 > snapshot : Allocates snapshot buffer, if not already allocated.
# Takes a snapshot of the main buffer.
# echo 2 > snapshot : Clears snapshot buffer (but does not allocate or free)
# (Doesn't have to be '2' works with any number that
# is not a '0' or '1')
But instead it just showed an empty buffer:
># cat snapshot
# tracer: nop
#
# entries-in-buffer/entries-written: 0/0 #P:4
#
# _-----=> irqs-off
# / _----=> need-resched
# | / _---=> hardirq/softirq
# || / _--=> preempt-depth
# ||| / delay
# TASK-PID CPU# |||| TIMESTAMP FUNCTION
# | | | |||| | |
What happened was that it was using the ring_buffer_iter_empty() function to
see if it was empty, and if it was, it showed the status. But that function
was returning false when it was empty. The reason was that the iter header
page was on the reader page, and the reader page was empty, but so was the
buffer itself. The check only tested to see if the iter was on the commit
page, but the commit page was no longer pointing to the reader page, but as
all pages were empty, the buffer is also.
Fixes:
651e22f2701b ("ring-buffer: Always reset iterator to reader page")
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Steven Rostedt (VMware) [Wed, 19 Apr 2017 16:07:08 +0000 (12:07 -0400)]
tracing: Allocate the snapshot buffer before enabling probe
commit
df62db5be2e5f070ecd1a5ece5945b590ee112e0 upstream.
Currently the snapshot trigger enables the probe and then allocates the
snapshot. If the probe triggers before the allocation, it could cause the
snapshot to fail and turn tracing off. It's best to allocate the snapshot
buffer first, and then enable the trigger. If something goes wrong in the
enabling of the trigger, the snapshot buffer is still allocated, but it can
also be freed by the user by writting zero into the snapshot buffer file.
Also add a check of the return status of alloc_snapshot().
Fixes:
77fd5c15e3 ("tracing: Add snapshot trigger to function probes")
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Ben Hutchings [Sat, 4 Feb 2017 16:56:32 +0000 (16:56 +0000)]
rtl8150: Use heap buffers for all register access
commit
7926aff5c57b577ab0f43364ff0c59d968f6a414 upstream.
Allocating USB buffers on the stack is not portable, and no longer
works on x86_64 (with VMAP_STACK enabled as per default).
Fixes:
1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
Cc: Brad Spengler <spender@grsecurity.net>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Ben Hutchings [Sat, 4 Feb 2017 16:56:03 +0000 (16:56 +0000)]
pegasus: Use heap buffers for all register access
commit
5593523f968bc86d42a035c6df47d5e0979b5ace upstream.
Allocating USB buffers on the stack is not portable, and no longer
works on x86_64 (with VMAP_STACK enabled as per default).
Fixes:
1da177e4c3f4 ("Linux-2.6.12-rc2")
References: https://bugs.debian.org/852556
Reported-by: Lisandro Damián Nicanor Pérez Meyer <lisandro@debian.org>
Tested-by: Lisandro Damián Nicanor Pérez Meyer <lisandro@debian.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
Cc: Brad Spengler <spender@grsecurity.net>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Benjamin Herrenschmidt [Mon, 20 Mar 2017 06:49:03 +0000 (17:49 +1100)]
powerpc: Disable HFSCR[TM] if TM is not supported
commit
7ed23e1bae8bf7e37fd555066550a00b95a3a98b upstream.
On Power8 & Power9 the early CPU inititialisation in __init_HFSCR()
turns on HFSCR[TM] (Hypervisor Facility Status and Control Register
[Transactional Memory]), but that doesn't take into account that TM
might be disabled by CPU features, or disabled by the kernel being built
with CONFIG_PPC_TRANSACTIONAL_MEM=n.
So later in boot, when we have setup the CPU features, clear HSCR[TM] if
the TM CPU feature has been disabled. We use CPU_FTR_TM_COMP to account
for the CONFIG_PPC_TRANSACTIONAL_MEM=n case.
Without this a KVM guest might try use TM, even if told not to, and
cause an oops in the host kernel. Typically the oops is seen in
__kvmppc_vcore_entry() and may or may not be fatal to the host, but is
always bad news.
In practice all shipping CPU revisions do support TM, and all host
kernels we are aware of build with TM support enabled, so no one should
actually be able to hit this in the wild.
Fixes:
2a3563b023e5 ("powerpc: Setup in HFSCR for POWER8")
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Tested-by: Sam Bobroff <sam.bobroff@au1.ibm.com>
[mpe: Rewrite change log with input from Sam, add Fixes/stable]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
[sb: Backported to linux-4.4.y: adjusted context]
Signed-off-by: Sam Bobroff <sam.bobroff@au1.ibm.com>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Geert Uytterhoeven [Mon, 11 Apr 2016 08:40:55 +0000 (10:40 +0200)]
char: Drop bogus dependency of DEVPORT on !M68K
commit
309124e2648d668a0c23539c5078815660a4a850 upstream.
According to full-history-linux commit
d3794f4fa7c3edc3 ("[PATCH] M68k
update (part 25)"), port operations are allowed on m68k if CONFIG_ISA is
defined.
However, commit
153dcc54df826d2f ("[PATCH] mem driver: fix conditional
on isa i/o support") accidentally changed an "||" into an "&&",
disabling it completely on m68k. This logic was retained when
introducing the DEVPORT symbol in commit
4f911d64e04a44c4 ("Make
/dev/port conditional on config symbol").
Drop the bogus dependency on !M68K to fix this.
Fixes:
153dcc54df826d2f ("[PATCH] mem driver: fix conditional on isa i/o support")
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Tested-by: Al Stone <ahs3@redhat.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Jack Morgenstein [Mon, 16 Jan 2017 16:31:37 +0000 (18:31 +0200)]
net/mlx4_core: Fix racy CQ (Completion Queue) free
commit
291c566a28910614ce42d0ffe82196eddd6346f4 upstream.
In function mlx4_cq_completion() and mlx4_cq_event(), the
radix_tree_lookup requires a rcu_read_lock.
This is mandatory: if another core frees the CQ, it could
run the radix_tree_node_rcu_free() call_rcu() callback while
its being used by the radix tree lookup function.
Additionally, in function mlx4_cq_event(), since we are adding
the rcu lock around the radix-tree lookup, we no longer need to take
the spinlock. Also, the synchronize_irq() call for the async event
eliminates the need for incrementing the cq reference count in
mlx4_cq_event().
Other changes:
1. In function mlx4_cq_free(), replace spin_lock_irq with spin_lock:
we no longer take this spinlock in the interrupt context.
The spinlock here, therefore, simply protects against different
threads simultaneously invoking mlx4_cq_free() for different cq's.
2. In function mlx4_cq_free(), we move the radix tree delete to before
the synchronize_irq() calls. This guarantees that we will not
access this cq during any subsequent interrupts, and therefore can
safely free the CQ after the synchronize_irq calls. The rcu_read_lock
in the interrupt handlers only needs to protect against corrupting the
radix tree; the interrupt handlers may access the cq outside the
rcu_read_lock due to the synchronize_irq calls which protect against
premature freeing of the cq.
3. In function mlx4_cq_event(), we change the mlx_warn message to mlx4_dbg.
4. We leave the cq reference count mechanism in place, because it is
still needed for the cq completion tasklet mechanism.
Fixes:
6d90aa5cf17b ("net/mlx4_core: Make sure there are no pending async events when freeing CQ")
Fixes:
225c7b1feef1 ("IB/mlx4: Add a driver Mellanox ConnectX InfiniBand adapters")
Signed-off-by: Jack Morgenstein <jackm@dev.mellanox.co.il>
Signed-off-by: Matan Barak <matanb@mellanox.com>
Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Eugenia Emantayev [Thu, 29 Dec 2016 16:37:10 +0000 (18:37 +0200)]
net/mlx4_en: Fix bad WQE issue
commit
6496bbf0ec481966ef9ffe5b6660d8d1b55c60cc upstream.
Single send WQE in RX buffer should be stamped with software
ownership in order to prevent the flow of QP in error in FW
once UPDATE_QP is called.
Fixes:
9f519f68cfff ('mlx4_en: Not using Shared Receive Queues')
Signed-off-by: Eugenia Emantayev <eugenia@mellanox.com>
Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Marcelo Henrique Cerri [Mon, 13 Mar 2017 15:14:58 +0000 (12:14 -0300)]
s390/decompressor: fix initrd corruption caused by bss clear
commit
d82c0d12c92705ef468683c9b7a8298dd61ed191 upstream.
Reorder the operations in decompress_kernel() to ensure initrd is moved
to a safe location before the bss section is zeroed.
During decompression bss can overlap with the initrd and this can
corrupt the initrd contents depending on the size of the compressed
kernel (which affects where the initrd is placed by the bootloader) and
the size of the bss section of the decompressor.
Also use the correct initrd size when checking for overlaps with
parmblock.
Fixes:
06c0dd72aea3 ([S390] fix boot failures with compressed kernels)
Reviewed-by: Joy Latten <joy.latten@canonical.com>
Reviewed-by: Vineetha HariPai <vineetha.hari.pai@canonical.com>
Signed-off-by: Marcelo Henrique Cerri <marcelo.cerri@canonical.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Willy Tarreau <w@1wt.eu>
James Hogan [Tue, 4 Apr 2017 07:51:34 +0000 (08:51 +0100)]
metag/usercopy: Add missing fixups
commit
b884a190afcecdbef34ca508ea5ee88bb7c77861 upstream.
The rapf copy loops in the Meta usercopy code is missing some extable
entries for HTP cores with unaligned access checking enabled, where
faults occur on the instruction immediately after the faulting access.
Add the fixup labels and extable entries for these cases so that corner
case user copy failures don't cause kernel crashes.
Fixes:
373cd784d0fc ("metag: Memory handling")
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: linux-metag@vger.kernel.org
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Willy Tarreau <w@1wt.eu>
James Hogan [Mon, 3 Apr 2017 16:41:40 +0000 (17:41 +0100)]
metag/usercopy: Fix src fixup in from user rapf loops
commit
2c0b1df88b987a12d95ea1d6beaf01894f3cc725 upstream.
The fixup code to rewind the source pointer in
__asm_copy_from_user_{32,64}bit_rapf_loop() always rewound the source by
a single unit (4 or 8 bytes), however this is insufficient if the fault
didn't occur on the first load in the loop, as the source pointer will
have been incremented but nothing will have been stored until all 4
register [pairs] are loaded.
Read the LSM_STEP field of TXSTATUS (which is already loaded into a
register), a bit like the copy_to_user versions, to determine how many
iterations of MGET[DL] have taken place, all of which need rewinding.
Fixes:
373cd784d0fc ("metag: Memory handling")
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: linux-metag@vger.kernel.org
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Willy Tarreau <w@1wt.eu>
James Hogan [Tue, 4 Apr 2017 10:43:26 +0000 (11:43 +0100)]
metag/usercopy: Set flags before ADDZ
commit
fd40eee1290ad7add7aa665e3ce6b0f9fe9734b4 upstream.
The fixup code for the copy_to_user rapf loops reads TXStatus.LSM_STEP
to decide how far to rewind the source pointer. There is a special case
for the last execution of an MGETL/MGETD, since it leaves LSM_STEP=0
even though the number of MGETLs/MGETDs attempted was 4. This uses ADDZ
which is conditional upon the Z condition flag, but the AND instruction
which masked the TXStatus.LSM_STEP field didn't set the condition flags
based on the result.
Fix that now by using ANDS which does set the flags, and also marking
the condition codes as clobbered by the inline assembly.
Fixes:
373cd784d0fc ("metag: Memory handling")
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: linux-metag@vger.kernel.org
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Willy Tarreau <w@1wt.eu>
James Hogan [Fri, 31 Mar 2017 12:35:01 +0000 (13:35 +0100)]
metag/usercopy: Add early abort to copy_to_user
commit
fb8ea062a8f2e85256e13f55696c5c5f0dfdcc8b upstream.
When copying to userland on Meta, if any faults are encountered
immediately abort the copy instead of continuing on and repeatedly
faulting, and worse potentially copying further bytes successfully to
subsequent valid pages.
Fixes:
373cd784d0fc ("metag: Memory handling")
Reported-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: linux-metag@vger.kernel.org
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Willy Tarreau <w@1wt.eu>
James Hogan [Fri, 31 Mar 2017 10:23:18 +0000 (11:23 +0100)]
metag/usercopy: Fix alignment error checking
commit
2257211942bbbf6c798ab70b487d7e62f7835a1a upstream.
Fix the error checking of the alignment adjustment code in
raw_copy_from_user(), which mistakenly considers it safe to skip the
error check when aligning the source buffer on a 2 or 4 byte boundary.
If the destination buffer was unaligned it may have started to copy
using byte or word accesses, which could well be at the start of a new
(valid) source page. This would result in it appearing to have copied 1
or 2 bytes at the end of the first (invalid) page rather than none at
all.
Fixes:
373cd784d0fc ("metag: Memory handling")
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: linux-metag@vger.kernel.org
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Wei Yongjun [Fri, 17 Jun 2016 17:33:59 +0000 (17:33 +0000)]
ring-buffer: Fix return value check in test_ringbuffer()
commit
62277de758b155dc04b78f195a1cb5208c37b2df upstream.
In case of error, the function kthread_run() returns ERR_PTR()
and never returns NULL. The NULL test in the return value check
should be replaced with IS_ERR().
Link: http://lkml.kernel.org/r/1466184839-14927-1-git-send-email-weiyj_lk@163.com
Fixes:
6c43e554a ("ring-buffer: Add ring buffer startup selftest")
Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Willy Tarreau <w@1wt.eu>
bsegall@google.com [Fri, 7 Apr 2017 23:04:51 +0000 (16:04 -0700)]
ptrace: fix PTRACE_LISTEN race corrupting task->state
commit
5402e97af667e35e54177af8f6575518bf251d51 upstream.
In PT_SEIZED + LISTEN mode STOP/CONT signals cause a wakeup against
__TASK_TRACED. If this races with the ptrace_unfreeze_traced at the end
of a PTRACE_LISTEN, this can wake the task /after/ the check against
__TASK_TRACED, but before the reset of state to TASK_TRACED. This
causes it to instead clobber TASK_WAKING, allowing a subsequent wakeup
against TRACED while the task is still on the rq wake_list, corrupting
it.
Oleg said:
"The kernel can crash or this can lead to other hard-to-debug problems.
In short, "task->state = TASK_TRACED" in ptrace_unfreeze_traced()
assumes that nobody else can wake it up, but PTRACE_LISTEN breaks the
contract. Obviusly it is very wrong to manipulate task->state if this
task is already running, or WAKING, or it sleeps again"
[akpm@linux-foundation.org: coding-style fixes]
Fixes:
9899d11f ("ptrace: ensure arch_ptrace/ptrace_request can never race with SIGKILL")
Link: http://lkml.kernel.org/r/xm26y3vfhmkp.fsf_-_@bsegall-linux.mtv.corp.google.com
Signed-off-by: Ben Segall <bsegall@google.com>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Andrew Lunn [Tue, 1 Dec 2015 15:31:08 +0000 (16:31 +0100)]
ipv4: igmp: Allow removing groups from a removed interface
commit
4eba7bb1d72d9bde67d810d09bf62dc207b63c5c upstream.
When a multicast group is joined on a socket, a struct ip_mc_socklist
is appended to the sockets mc_list containing information about the
joined group.
If the interface is hot unplugged, this entry becomes stale. Prior to
commit
52ad353a5344f ("igmp: fix the problem when mc leave group") it
was possible to remove the stale entry by performing a
IP_DROP_MEMBERSHIP, passing either the old ifindex or ip address on
the interface. However, this fix enforces that the interface must
still exist. Thus with time, the number of stale entries grows, until
sysctl_igmp_max_memberships is reached and then it is not possible to
join and more groups.
The previous patch fixes an issue where a IP_DROP_MEMBERSHIP is
performed without specifying the interface, either by ifindex or ip
address. However here we do supply one of these. So loosen the
restriction on device existence to only apply when the interface has
not been specified. This then restores the ability to clean up the
stale entries.
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Fixes:
52ad353a5344f "(igmp: fix the problem when mc leave group")
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Ludovic Desroches [Mon, 26 Oct 2015 09:38:27 +0000 (10:38 +0100)]
i2c: at91: manage unexpected RXRDY flag when starting a transfer
commit
a9bed6b10bd117a300cceb9062003f7a2761ef99 upstream.
In some cases, we could start a new i2c transfer with the RXRDY flag
set. It is not a clean state and it leads to print annoying error
messages even if there no real issue. The cause is only having garbage
data in the Receive Holding Register because of a weird behavior of the
RXRDY flag.
Reported-by: Peter Rosin <peda@lysator.liu.se>
Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
Tested-by: Peter Rosin <peda@lysator.liu.se>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Fixes:
93563a6a71bb ("i2c: at91: fix a race condition when using the DMA controller")
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Alan Stern [Tue, 30 Jun 2015 15:25:54 +0000 (11:25 -0400)]
USB: OHCI: Fix race between ED unlink and URB submission
commit
7d8021c967648accd1b78e5e1ddaad655cd2c61f upstream.
This patch fixes a bug introduced by commit
977dcfdc6031 ("USB: OHCI:
don't lose track of EDs when a controller dies"). The commit changed
ed_state from ED_UNLINK to ED_IDLE too early, before finish_urb() had
been called. The user-visible consequence is that the driver
occasionally crashes or locks up when an URB is submitted while
another URB for the same endpoint is being unlinked.
This patch moves the ED state change later, to the right place. The
drawback is that now we may unnecessarily execute some instructions
multiple times when a controller dies. Since controllers dying is an
exceptional occurrence, a little wasted time won't matter.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Reported-by: Heiko Przybyl <lil_tux@web.de>
Tested-by: Heiko Przybyl <lil_tux@web.de>
Fixes:
977dcfdc60311e7aa571cabf6f39c36dde13339e
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Rafael J. Wysocki [Sat, 4 Jul 2015 01:09:03 +0000 (03:09 +0200)]
ACPI / PNP: Reserve ACPI resources at the fs_initcall_sync stage
commit
0294112ee3135fbd15eaa70015af8283642dd970 upstream.
This effectively reverts the following three commits:
7bc10388ccdd ACPI / resources: free memory on error in add_region_before()
0f1b414d1907 ACPI / PNP: Avoid conflicting resource reservations
b9a5e5e18fbf ACPI / init: Fix the ordering of acpi_reserve_resources()
(commit
b9a5e5e18fbf introduced regressions some of which, but not
all, were addressed by commit
0f1b414d1907 and commit
7bc10388ccdd
was a fixup on top of the latter) and causes ACPI fixed hardware
resources to be reserved at the fs_initcall_sync stage of system
initialization.
The story is as follows. First, a boot regression was reported due
to an apparent resource reservation ordering change after a commit
that shouldn't lead to such changes. Investigation led to the
conclusion that the problem happened because acpi_reserve_resources()
was executed at the device_initcall() stage of system initialization
which wasn't strictly ordered with respect to driver initialization
(and with respect to the initialization of the pcieport driver in
particular), so a random change causing the device initcalls to be
run in a different order might break things.
The response to that was to attempt to run acpi_reserve_resources()
as soon as we knew that ACPI would be in use (commit
b9a5e5e18fbf).
However, that turned out to be too early, because it caused resource
reservations made by the PNP system driver to fail on at least one
system and that failure was addressed by commit
0f1b414d1907.
That fix still turned out to be insufficient, though, because
calling acpi_reserve_resources() before the fs_initcall stage of
system initialization caused a boot regression to happen on the
eCAFE EC-800-H20G/S netbook. That meant that we only could call
acpi_reserve_resources() at the fs_initcall initialization stage
or later, but then we might just as well call it after the PNP
initalization in which case commit
0f1b414d1907 wouldn't be
necessary any more.
For this reason, the changes made by commit
0f1b414d1907 are reverted
(along with a memory leak fixup on top of that commit), the changes
made by commit
b9a5e5e18fbf that went too far are reverted too and
acpi_reserve_resources() is changed into fs_initcall_sync, which
will cause it to be executed after the PNP subsystem initialization
(which is an fs_initcall) and before device initcalls (including
the pcieport driver initialization) which should avoid the initial
issue.
Link: https://bugzilla.kernel.org/show_bug.cgi?id=100581
Link: http://marc.info/?t=143092384600002&r=1&w=2
Link: https://bugzilla.kernel.org/show_bug.cgi?id=99831
Link: http://marc.info/?t=143389402600001&r=1&w=2
Fixes:
b9a5e5e18fbf "ACPI / init: Fix the ordering of acpi_reserve_resources()"
Reported-by: Roland Dreier <roland@purestorage.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Willy Tarreau <w@1wt.eu>
projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / log