tree e0a8e02b5cb9296e057f68b4cb8a53398345e189
parent 8f4ab07f4bf1b1069c01b7c6758a7d444406996b
author Grazvydas Ignotas <notasas@gmail.com> 1423782019 -0800
committer Linus Torvalds <torvalds@linux-foundation.org> 1423796051 -0800

mm/memory.c: actually remap enough memory

For whatever reason, generic_access_phys() only remaps one page, but
actually allows to access arbitrary size.  It's quite easy to trigger
large reads, like printing out large structure with gdb, which leads to a
crash.  Fix it by remapping correct size.

Fixes: 28b2ee20c7cb ("access_process_vm device memory infrastructure")
Signed-off-by: Grazvydas Ignotas <notasas@gmail.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>