]> git.baikalelectronics.ru Git - kernel.git/commit
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)
commit067383b7da48c19cd0d77f805d8e76bd0b5cf36b
tree93fdcd656a687ca3fa5f717f9ce078cd8aea6c70
parent5948862fde9344a9b06eaa1e690e0f4eead9c09a
pagemap: do not leak physical addresses to non-privileged userspace

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