lkml.org 
[lkml]   [2016]   [Sep]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
Subjectperf: out-of-bounds write in perf_callchain_store
Hello,

The following program trigger an out-of-bounds write in
perf_callchain_store (if run in a parallel loop):

https://gist.githubusercontent.com/dvyukov/c05d883e776a353a1d063b670f50bde6/raw/1c8906b1aacfbd8a0cc0b5cf0cc4d0535345e497/gistfile1.txt


BUG: KASAN: slab-out-of-bounds in perf_callchain_user+0xe65/0xfc0 at
addr ffff88003e162840
Write of size 8 by task syz-executor/22516
CPU: 0 PID: 22516 Comm: syz-executor Not tainted 4.8.0-rc5-next-20160905+ #14
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
ffffffff886b6fe0 ffff88003ec07738 ffffffff82db81a9 ffffffff00000000
fffffbfff10d6dfc ffff88003e800a00 ffff88003e161740 ffff88003e163740
0000000000000001 ffff88003e162840 ffff88003ec07760 ffffffff8180b2ec
Call Trace:
[<ffffffff8180b9c7>] __asan_report_store8_noabort+0x17/0x20
mm/kasan/report.c:332
[< inline >] perf_callchain_store include/linux/perf_event.h:1146
[<ffffffff81014925>] perf_callchain_user+0xe65/0xfc0
arch/x86/events/core.c:2441
[<ffffffff816c5f48>] get_perf_callchain+0x448/0x680
kernel/events/callchain.c:235
[<ffffffff816c62cd>] perf_callchain+0x14d/0x1a0 kernel/events/callchain.c:191
[<ffffffff816bbf8f>] perf_prepare_sample+0x7df/0xfc0 kernel/events/core.c:5849
[< inline >] __perf_event_output kernel/events/core.c:5962
[<ffffffff816bc865>] perf_event_output_forward+0xf5/0x220
kernel/events/core.c:5980
[<ffffffff81691d27>] __perf_event_overflow+0x1c7/0x530
kernel/events/core.c:7059
[<ffffffff81692b00>] perf_swevent_hrtimer+0x210/0x350 kernel/events/core.c:8247
[< inline >] __run_hrtimer kernel/time/hrtimer.c:1238
[<ffffffff81504425>] __hrtimer_run_queues+0x325/0xe70
kernel/time/hrtimer.c:1302
[<ffffffff81506ddb>] hrtimer_interrupt+0x18b/0x420 kernel/time/hrtimer.c:1336
[<ffffffff8126ceff>] local_apic_timer_interrupt+0x6f/0xe0
arch/x86/kernel/apic/apic.c:933
[<ffffffff86e1d216>] smp_apic_timer_interrupt+0x76/0xa0
arch/x86/kernel/apic/apic.c:957
[<ffffffff86e1c2cc>] apic_timer_interrupt+0x8c/0xa0
arch/x86/entry/entry_64.S:487
<EOI>
Object at ffff88003e161740, in cache kmalloc-8192 size: 8192
Allocated:
PID = 22520
[<ffffffff8122f486>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:67
[<ffffffff8180a6d6>] save_stack+0x46/0xd0 mm/kasan/kasan.c:479
[< inline >] set_track mm/kasan/kasan.c:491
[<ffffffff8180a94d>] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:582
[< inline >] __do_kmalloc_node mm/slab.c:3709
[<ffffffff81807b47>] __kmalloc_node+0x47/0x70 mm/slab.c:3716
[< inline >] kmalloc_node include/linux/slab.h:532
[< inline >] alloc_callchain_buffers kernel/events/callchain.c:89
[<ffffffff816c5877>] get_callchain_buffers+0x1a7/0x3d0
kernel/events/callchain.c:136
[<ffffffff816ac778>] perf_event_alloc+0x1cb8/0x24b0 kernel/events/core.c:9187
[<ffffffff816b6084>] SYSC_perf_event_open+0x674/0x2250
kernel/events/core.c:9576
[<ffffffff816bed89>] SyS_perf_event_open+0x39/0x50 kernel/events/core.c:9470
[<ffffffff86e1a8c0>] entry_SYSCALL_64_fastpath+0x23/0xc1
Memory state around the buggy address:
ffff88003e162700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff88003e162780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88003e162800: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
^
ffff88003e162880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88003e162900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================


On commit 0693c28cfc8e25f18c25b65a8942c026f1854a3c (Sep 5) of linux-next.

\
 
 \ /
  Last update: 2016-09-17 09:58    [W:0.052 / U:0.276 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site