stackdepot: fix mempolicy use-after-free
This patch fixes the following:
BUG: KASAN: use-after-free in alloc_pages_current+0x363/0x370 at addr
ffff88010b48102c
Read of size 2 by task trinity-c2/15425
CPU: 0 PID: 15425 Comm: trinity-c2 Not tainted 4.8.0-rc2+ #140
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
rel-1.9.3-0-ge2fc41e-prebuilt.qemu-proje
ct.org 04/01/2014
ffff88010b481040 ffff88010b557650 ffffffff81f08d11 ffff88011a40d380
ffff88010b481028 ffff88010b557678 ffffffff815dac7c ffff88010b557708
ffff88010b481028 ffff88011a40d380 ffff88010b5576f8 ffffffff815daf15
Call Trace:
[<
ffffffff81f08d11>] dump_stack+0x65/0x84
[<
ffffffff815dac7c>] kasan_object_err+0x1c/0x70
[<
ffffffff815daf15>] kasan_report_error+0x1f5/0x4c0
[<
ffffffff815db2fe>] __asan_report_load2_noabort+0x3e/0x40
[<
ffffffff815cb903>] alloc_pages_current+0x363/0x370 <---- use-after-free
[<
ffffffff81fa9954>] depot_save_stack+0x3f4/0x490
[<
ffffffff815d9bb5>] save_stack+0xb5/0xd0
[<
ffffffff815da211>] kasan_slab_free+0x71/0xb0
[<
ffffffff815d6643>] kmem_cache_free+0xa3/0x290
[<
ffffffff815c8149>] __mpol_put+0x19/0x20 <---- free
[<
ffffffff81260635>] do_exit+0x1515/0x2b70
[<
ffffffff81261dc4>] do_group_exit+0xf4/0x2f0
[<
ffffffff81281c5d>] get_signal+0x53d/0x1120
[<
ffffffff8119e993>] do_signal+0x83/0x1e20
[<
ffffffff810027af>] exit_to_usermode_loop+0xaf/0x140
[<
ffffffff810051e4>] syscall_return_slowpath+0x144/0x170
[<
ffffffff83ae406f>] ret_from_fork+0x2f/0x40
Read of size 2 by task trinity-c2/15425
The problem is that we may be calling alloc_pages() in a code path where
current->mempolicy has already been freed.
By passing __GFP_THISNODE we will always use default_mempolicy (which
cannot be freed).
Link: https://lkml.org/lkml/2016/7/29/277
Link: https://github.com/google/kasan/issues/35
Link: http://lkml.kernel.org/r/1471603265-31804-1-git-send-email-vegard.nossum@oracle.com
Signed-off-by: Vegard Nossum <vegard.nossum@oracle.com>
Acked-by: Dmitry Vyukov <dvyukov@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>