pagemap: do not leak physical addresses to non-privileged userspace
authorKirill A. Shutemov <kirill.shutemov@linux.intel.com>
Mon, 9 Mar 2015 21:11:12 +0000 (23:11 +0200)
committerLinus Torvalds <torvalds@linux-foundation.org>
Tue, 17 Mar 2015 16:31:30 +0000 (09:31 -0700)
As pointed by recent post[1] on exploiting DRAM physical imperfection,
/proc/PID/pagemap exposes sensitive information which can be used to do
attacks.

This disallows anybody without CAP_SYS_ADMIN to read the pagemap.

[1] http://googleprojectzero.blogspot.com/2015/03/exploiting-dram-rowhammer-bug-to-gain.html

[ Eventually we might want to do anything more finegrained, but for now
  this is the simple model.   - Linus ]

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
Acked-by: Andy Lutomirski <luto@amacapital.net>
Cc: Pavel Emelyanov <xemul@parallels.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Mark Seaborn <mseaborn@chromium.org>
Cc: stable@vger.kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
fs/proc/task_mmu.c

index 956b75d61809f06cdf433411456bb08278726eb5..6dee68d013ffa69f1f6c9d49873f17f19eb3874d 100644 (file)
@@ -1325,6 +1325,9 @@ out:
 
 static int pagemap_open(struct inode *inode, struct file *file)
 {
+       /* do not disclose physical addresses: attack vector */
+       if (!capable(CAP_SYS_ADMIN))
+               return -EPERM;
        pr_warn_once("Bits 55-60 of /proc/PID/pagemap entries are about "
                        "to stop being page-shift some time soon. See the "
                        "linux/Documentation/vm/pagemap.txt for details.\n");