On 05/09/2018 11:59 PM, Dmitry Vyukov wrote:
On Wed, Jan 10, 2018 at 7:14 PM, Laura Abbott <labbott@xxxxxxxxxx> wrote:
On 01/09/2018 02:58 PM, syzbot wrote:
Hello,
syzkaller hit the following crash on
06d41862286aa7bc634a1dd9e6e7e96f925ef30a
git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/master
compiler: gcc (GCC) 7.1.1 20170620
.config is attached
Raw console output is attached.
C reproducer is attached
syzkaller reproducer is attached. See https://goo.gl/kgGztJ
for information about syzkaller reproducers
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+cd8bcd40cb049efa2770@xxxxxxxxxxxxxxxxxxxxxxxxx
It will help syzbot understand when the bug is fixed. See footer for
details.
If you forward the report, please keep this part and the footer.
audit: type=1400 audit(1515538424.230:7): avc: denied { map } for
pid=3499 comm="syzkaller239906" path="/root/syzkaller239906633" dev="sda1"
ino=16481 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1
WARNING: CPU: 0 PID: 1467 at drivers/staging/android/ion/ion.c:122
ion_buffer_destroy+0xd4/0x190 drivers/staging/android/ion/ion.c:122
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 1467 Comm: ion_system_heap Not tainted
4.15.0-rc7-next-20180109+ #92
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x194/0x257 lib/dump_stack.c:53
panic+0x1e4/0x41c kernel/panic.c:183
__warn+0x1dc/0x200 kernel/panic.c:547
report_bug+0x211/0x2d0 lib/bug.c:184
fixup_bug.part.11+0x37/0x80 arch/x86/kernel/traps.c:178
fixup_bug arch/x86/kernel/traps.c:247 [inline]
do_error_trap+0x2d7/0x3e0 arch/x86/kernel/traps.c:296
do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315
invalid_op+0x22/0x40 arch/x86/entry/entry_64.S:1079
RIP: 0010:ion_buffer_destroy+0xd4/0x190
drivers/staging/android/ion/ion.c:122
RSP: 0018:ffff8801d3a9fd28 EFLAGS: 00010293
RAX: ffff8801d39ee700 RBX: ffff8801c00e57c0 RCX: ffffffff8415d2a4
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8801d5ada5b8
RBP: ffff8801d3a9fd50 R08: 0000000000000000 R09: 1ffff1003a753f8a
R10: ffff8801d3a9fc18 R11: 0000000000000000 R12: ffffffff86e4c980
R13: ffff8801d5ada580 R14: ffff8801c00e57e0 R15: 0000000000000001
ion_heap_deferred_free+0x290/0x650
drivers/staging/android/ion/ion_heap.c:236
kthread+0x33c/0x400 kernel/kthread.c:238
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:524
Dumping ftrace buffer:
(ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..
This is catching that a buffer was freed with an existing kernel
map still present. The problem is this can easily be triggered from
userspace by calling DMA_BUF_SYNC_START without calling
DMA_BUF_SYNC_END. It's clearly not appropriate for userspace to
be able to trigger a warning so I'll see about switching this to
a pr_warn_once.
Hi Laura,
Any updates on this?
I thought I had sent a fix for this but I guess not. I'll see about
getting one out.
Thanks,
Laura
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