From 15b06f9a02406e5460001db6d5af5c738cd3d4e7 Mon Sep 17 00:00:00 2001 From: Vaughan Cao Date: Thu, 29 Aug 2013 10:00:36 +0800 Subject: [PATCH] [SCSI] sg: use rwsem to solve race during exclusive open A race condition may happen if two threads are both trying to open the same sg with O_EXCL simultaneously. It's possible that they both find fsds list is empty and get_exclude(sdp) returns 0, then they both call set_exclude() and break out from wait_event_interruptible and resume open. Now use rwsem to protect this process. Exclusive open gets write lock and others get read lock. The lock will be held until file descriptor is closed. This also leads 'exclude' only a status rather than a check mark. Signed-off-by: Vaughan Cao Acked-by: Douglas Gilbert Signed-off-by: James Bottomley --- drivers/scsi/sg.c | 79 ++++++++++++++++++++++++----------------------- 1 file changed, 41 insertions(+), 38 deletions(-) diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c index df5e961484e1..4efa9b5884b7 100644 --- a/drivers/scsi/sg.c +++ b/drivers/scsi/sg.c @@ -170,11 +170,11 @@ typedef struct sg_fd { /* holds the state of a file descriptor */ typedef struct sg_device { /* holds the state of each scsi generic device */ struct scsi_device *device; - wait_queue_head_t o_excl_wait; /* queue open() when O_EXCL in use */ int sg_tablesize; /* adapter's max scatter-gather table size */ u32 index; /* device index number */ /* sfds is protected by sg_index_lock */ struct list_head sfds; + struct rw_semaphore o_sem; /* exclude open should hold this rwsem */ volatile char detached; /* 0->attached, 1->detached pending removal */ /* exclude protected by sg_open_exclusive_lock */ char exclude; /* opened for exclusive access */ @@ -265,7 +265,6 @@ sg_open(struct inode *inode, struct file *filp) struct request_queue *q; Sg_device *sdp; Sg_fd *sfp; - int res; int retval; nonseekable_open(inode, filp); @@ -294,35 +293,35 @@ sg_open(struct inode *inode, struct file *filp) goto error_out; } - if (flags & O_EXCL) { - if (O_RDONLY == (flags & O_ACCMODE)) { - retval = -EPERM; /* Can't lock it with read only access */ - goto error_out; - } - if (!sfds_list_empty(sdp) && (flags & O_NONBLOCK)) { - retval = -EBUSY; - goto error_out; - } - res = wait_event_interruptible(sdp->o_excl_wait, - ((!sfds_list_empty(sdp) || get_exclude(sdp)) ? 0 : set_exclude(sdp, 1))); - if (res) { - retval = res; /* -ERESTARTSYS because signal hit process */ - goto error_out; - } - } else if (get_exclude(sdp)) { /* some other fd has an exclusive lock on dev */ - if (flags & O_NONBLOCK) { - retval = -EBUSY; - goto error_out; - } - res = wait_event_interruptible(sdp->o_excl_wait, !get_exclude(sdp)); - if (res) { - retval = res; /* -ERESTARTSYS because signal hit process */ - goto error_out; + if ((flags & O_EXCL) && (O_RDONLY == (flags & O_ACCMODE))) { + retval = -EPERM; /* Can't lock it with read only access */ + goto error_out; + } + if (flags & O_NONBLOCK) { + if (flags & O_EXCL) { + if (!down_write_trylock(&sdp->o_sem)) { + retval = -EBUSY; + goto error_out; + } + } else { + if (!down_read_trylock(&sdp->o_sem)) { + retval = -EBUSY; + goto error_out; + } } + } else { + if (flags & O_EXCL) + down_write(&sdp->o_sem); + else + down_read(&sdp->o_sem); } + /* Since write lock is held, no need to check sfd_list */ + if (flags & O_EXCL) + set_exclude(sdp, 1); + if (sdp->detached) { retval = -ENODEV; - goto error_out; + goto sem_out; } if (sfds_list_empty(sdp)) { /* no existing opens on this device */ sdp->sgdebug = 0; @@ -331,17 +330,18 @@ sg_open(struct inode *inode, struct file *filp) } if ((sfp = sg_add_sfp(sdp, dev))) filp->private_data = sfp; + /* retval is already provably zero at this point because of the + * check after retval = scsi_autopm_get_device(sdp->device)) + */ else { + retval = -ENOMEM; +sem_out: if (flags & O_EXCL) { set_exclude(sdp, 0); /* undo if error */ - wake_up_interruptible(&sdp->o_excl_wait); - } - retval = -ENOMEM; - goto error_out; - } - retval = 0; + up_write(&sdp->o_sem); + } else + up_read(&sdp->o_sem); error_out: - if (retval) { scsi_autopm_put_device(sdp->device); sdp_put: scsi_device_put(sdp->device); @@ -358,13 +358,18 @@ sg_release(struct inode *inode, struct file *filp) { Sg_device *sdp; Sg_fd *sfp; + int excl; if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) return -ENXIO; SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name)); + excl = get_exclude(sdp); set_exclude(sdp, 0); - wake_up_interruptible(&sdp->o_excl_wait); + if (excl) + up_write(&sdp->o_sem); + else + up_read(&sdp->o_sem); scsi_autopm_put_device(sdp->device); kref_put(&sfp->f_ref, sg_remove_sfp); @@ -1416,7 +1421,7 @@ static Sg_device *sg_alloc(struct gendisk *disk, struct scsi_device *scsidp) sdp->disk = disk; sdp->device = scsidp; INIT_LIST_HEAD(&sdp->sfds); - init_waitqueue_head(&sdp->o_excl_wait); + init_rwsem(&sdp->o_sem); sdp->sg_tablesize = queue_max_segments(q); sdp->index = k; kref_init(&sdp->d_ref); @@ -2127,13 +2132,11 @@ static void sg_remove_sfp_usercontext(struct work_struct *work) static void sg_remove_sfp(struct kref *kref) { struct sg_fd *sfp = container_of(kref, struct sg_fd, f_ref); - struct sg_device *sdp = sfp->parentdp; unsigned long iflags; write_lock_irqsave(&sg_index_lock, iflags); list_del(&sfp->sfd_siblings); write_unlock_irqrestore(&sg_index_lock, iflags); - wake_up_interruptible(&sdp->o_excl_wait); INIT_WORK(&sfp->ew.work, sg_remove_sfp_usercontext); schedule_work(&sfp->ew.work); -- 2.20.1