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Message-ID: <CACT4Y+YSv9cd3fMFVSk-o=xxsqeYTTh03=cmY-3_N1RoSf1Y9Q@mail.gmail.com>
Date: Tue, 28 Jun 2016 14:58:50 +0200
From: Dmitry Vyukov <dvyukov@...gle.com>
To: Steven Rostedt <rostedt@...dmis.org>,
Ingo Molnar <mingo@...hat.com>,
LKML <linux-kernel@...r.kernel.org>
Cc: Alexander Potapenko <glider@...gle.com>,
Kostya Serebryany <kcc@...gle.com>,
kasan-dev <kasan-dev@...glegroups.com>
Subject: trace: use-after-free in hist_unreg_all
Hello,
While running tools/testing/selftests test suite with KASAN I hit the
following use-after-free report:
==================================================================
BUG: KASAN: use-after-free in hist_unreg_all+0x1a1/0x1d0 at addr
ffff880031632cc0
Read of size 8 by task ftracetest/7413
=============================================================================
BUG kmalloc-128 (Not tainted): kasan: bad access detected
-----------------------------------------------------------------------------
Disabling lock debugging due to kernel taint
INFO: Allocated in 0xbbbbbbbbbbbbbbbb age=18446712312426182376 cpu=0 pid=0
[< inline >] kmalloc include/linux/slab.h:478
[< inline >] kzalloc include/linux/slab.h:622
[< none >] event_hist_trigger_func+0xfcd/0x2430
kernel/trace/trace_events_hist.c:1552
[< none >] ___slab_alloc+0x564/0x5e0 mm/slub.c:2446
[< none >] __slab_alloc+0x68/0xc0 mm/slub.c:2475
[< inline >] slab_alloc_node mm/slub.c:2538
[< inline >] slab_alloc mm/slub.c:2580
[< none >] kmem_cache_alloc_trace+0x263/0x3d0 mm/slub.c:2597
[< inline >] kmalloc include/linux/slab.h:478
[< inline >] kzalloc include/linux/slab.h:622
[< none >] event_hist_trigger_func+0xfcd/0x2430
kernel/trace/trace_events_hist.c:1552
[< inline >] trigger_process_regex
kernel/trace/trace_events_trigger.c:234
[< inline >] event_trigger_regex_write
kernel/trace/trace_events_trigger.c:271
[< none >] event_trigger_write+0x244/0x3c0
kernel/trace/trace_events_trigger.c:300
[< none >] __vfs_write+0x10b/0x620 fs/read_write.c:510
[< none >] vfs_write+0x170/0x4a0 fs/read_write.c:560
[< inline >] SYSC_write fs/read_write.c:607
[< none >] SyS_write+0xd4/0x1a0 fs/read_write.c:599
[< none >] entry_SYSCALL_64_fastpath+0x23/0xc1
arch/x86/entry/entry_64.S:207
INFO: Freed in 0xfffcb4bb age=18446712239411738348 cpu=0 pid=0
[< none >] trigger_data_free+0x75/0x90
kernel/trace/trace_events_trigger.c:37
[< none >] __slab_free+0x1e8/0x300 mm/slub.c:2657
[< inline >] slab_free mm/slub.c:2810
[< none >] kfree+0x2fc/0x370 mm/slub.c:3662
[< none >] trigger_data_free+0x75/0x90
kernel/trace/trace_events_trigger.c:37
[< none >] event_hist_trigger_free+0xb5/0x120
kernel/trace/trace_events_hist.c:1256
[< none >] hist_unreg_all+0x156/0x1d0
kernel/trace/trace_events_hist.c:1511
[< inline >] event_trigger_regex_open
kernel/trace/trace_events_trigger.c:205
[< none >] event_trigger_open+0x1ee/0x2a0
kernel/trace/trace_events_trigger.c:306
[< none >] do_dentry_open+0x698/0xca0 fs/open.c:736
[< none >] vfs_open+0x10f/0x210 fs/open.c:849
[< inline >] do_last fs/namei.c:3360
[< none >] path_openat+0x12f9/0x2a80 fs/namei.c:3483
[< none >] do_filp_open+0x18c/0x250 fs/namei.c:3518
[< none >] do_sys_open+0x1fc/0x420 fs/open.c:1016
[< inline >] SYSC_open fs/open.c:1034
[< none >] SyS_open+0x2d/0x40 fs/open.c:1029
[< none >] entry_SYSCALL_64_fastpath+0x23/0xc1
arch/x86/entry/entry_64.S:207
INFO: Slab 0xffffea0000c58c80 objects=17 used=15 fp=0xffff880031632398
flags=0xfffe0000004080
INFO: Object 0xffff880031632c78 @offset=3192 fp=0xbbbbbbbbbbbbbbbb
Redzone ffff880031632c70: d0 6f 81 81 ff ff ff ff
.o......
Object ffff880031632c78: bb bb bb bb bb bb bb bb 00 00 00 00 00 00 00
00 ................
Object ffff880031632c88: 00 00 00 00 00 00 00 00 c0 17 18 88 ff ff ff
ff ................
Object ffff880031632c98: 00 17 18 88 ff ff ff ff 00 00 00 00 00 00 00
00 ................
Object ffff880031632ca8: 00 00 00 00 00 00 00 00 98 23 63 31 00 88 ff
ff .........#c1....
Object ffff880031632cb8: 00 00 00 00 00 00 00 00 40 e0 96 3e 00 88 ff
ff ........@..>....
Object ffff880031632cc8: 00 02 00 00 00 00 ad de 00 00 00 00 00 00 00
00 ................
Object ffff880031632cd8: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 ................
Object ffff880031632ce8: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 ................
Redzone ffff880031632cf8: 00 00 00 00 00 00 00 00
........
Padding ffff880031632e30: aa b6 fc ff 00 00 00 00
........
CPU: 0 PID: 7413 Comm: ftracetest Tainted: G B 4.7.0-rc4+ #6
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
ffffffff880b58e0 ffff88005ed1f8e8 ffffffff82cc83cf ffffffff00c58c80
fffffbfff1016b1c ffff880031632000 ffff880031632c78 ffff88003e807480
ffffea0000c58c80 ffffffff8160e820 ffff88005ed1f918 ffffffff817b3ec0
Call Trace:
[<ffffffff817be0de>] __asan_report_load8_noabort+0x3e/0x40
mm/kasan/report.c:319
[< inline >] __read_once_size include/linux/compiler.h:222
[<ffffffff8160f651>] hist_unreg_all+0x1a1/0x1d0
kernel/trace/trace_events_hist.c:1505
[< inline >] event_trigger_regex_open
kernel/trace/trace_events_trigger.c:205
[<ffffffff8160b05e>] event_trigger_open+0x1ee/0x2a0
kernel/trace/trace_events_trigger.c:306
[<ffffffff8180e648>] do_dentry_open+0x698/0xca0 fs/open.c:736
[<ffffffff81811bff>] vfs_open+0x10f/0x210 fs/open.c:849
[< inline >] do_last fs/namei.c:3360
[<ffffffff81846dc9>] path_openat+0x12f9/0x2a80 fs/namei.c:3483
[<ffffffff8184bb5c>] do_filp_open+0x18c/0x250 fs/namei.c:3518
[<ffffffff818123fc>] do_sys_open+0x1fc/0x420 fs/open.c:1016
[< inline >] SYSC_open fs/open.c:1034
[<ffffffff8181264d>] SyS_open+0x2d/0x40 fs/open.c:1029
[<ffffffff86a99600>] entry_SYSCALL_64_fastpath+0x23/0xc1
arch/x86/entry/entry_64.S:207
Memory state around the buggy address:
ffff880031632b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff880031632c00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff880031632c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff880031632d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff880031632d80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
On commit 67016f6cdfd079e632bbc49e33178b2d558c120a (Jun 20).
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