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Message-ID: <001a1140f3e268c996055cd6434b@google.com>
Date:   Tue, 31 Oct 2017 04:43:27 -0700
From:   syzbot 
        <bot+eec541c6a1e7663177fcb48a5814c0a0776c9f68@...kaller.appspotmail.com>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     dvhart@...radead.org, dvyukov@...gle.com,
        linux-kernel@...r.kernel.org, mingo@...hat.com,
        peterz@...radead.org, syzkaller-bugs@...glegroups.com,
        tglx@...utronix.de
Subject: Re: KASAN: use-after-free Read in perf_trace_lock_acquire

> #syz upstream

Can't upstream, this is final destination.


> On Mon, Oct 30, 2017 at 10:53 PM, syzbot
> <bot+eec541c6a1e7663177fcb48a5814c0a0776c9f68@...kaller.appspotmail.com>
> wrote:
>> Hello,

>> syzkaller hit the following crash on
>> dbeb1a8ff547ffc2db69b44b4445a9eadc025abf
>> git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/master
>> compiler: gcc (GCC) 7.1.1 20170620
>> .config is attached
>> Raw console output is attached.




>> netlink: 5 bytes leftover after parsing attributes in process
>> `syz-executor6'.
>> ==================================================================
>> BUG: KASAN: use-after-free in perf_trace_lock_acquire+0x8cf/0x900
>> include/trace/events/lock.h:12
>> Read of size 8 at addr ffff8801c7497a40 by task syz-executor4/3410

>> CPU: 1 PID: 3410 Comm: syz-executor4 Not tainted 4.14.0-rc3+ #29
>> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
>> Google 01/01/2011
>> Call Trace:
>>   __dump_stack lib/dump_stack.c:16 [inline]
>>   dump_stack+0x194/0x257 lib/dump_stack.c:52
>>   print_address_description+0x73/0x250 mm/kasan/report.c:252
>>   kasan_report_error mm/kasan/report.c:351 [inline]
>>   kasan_report+0x25b/0x340 mm/kasan/report.c:409
>>   __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:430
>>   perf_trace_lock_acquire+0x8cf/0x900 include/trace/events/lock.h:12
>>   trace_lock_acquire include/trace/events/lock.h:12 [inline]
>>   lock_acquire+0x394/0x580 kernel/locking/lockdep.c:4001
>>   __raw_spin_lock_irq include/linux/spinlock_api_smp.h:128 [inline]
>>   _raw_spin_lock_irq+0x5e/0x80 kernel/locking/spinlock.c:167
>>   exit_pi_state_list+0x369/0x7a0 kernel/futex.c:914
>>   mm_release+0x46d/0x590 kernel/fork.c:1144
>>   exit_mm kernel/exit.c:499 [inline]
>>   do_exit+0x481/0x1af0 kernel/exit.c:852
>>   do_group_exit+0x149/0x400 kernel/exit.c:968
>>   get_signal+0x73f/0x16d0 kernel/signal.c:2334
>>   do_signal+0x94/0x1ee0 arch/x86/kernel/signal.c:808
>>   exit_to_usermode_loop+0x214/0x310 arch/x86/entry/common.c:158
>>   prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
>>   syscall_return_slowpath arch/x86/entry/common.c:266 [inline]
>>   do_syscall_32_irqs_on arch/x86/entry/common.c:335 [inline]
>>   do_fast_syscall_32+0x83e/0xf05 arch/x86/entry/common.c:391
>>   entry_SYSENTER_compat+0x51/0x60 arch/x86/entry/entry_64_compat.S:124
>> RIP: 0023:0xf7f71c79
>> RSP: 002b:00000000f774c12c EFLAGS: 00000292 ORIG_RAX: 00000000000000f0
>> RAX: 0000000000000000 RBX: 0000000008128088 RCX: 0000000000000000
>> RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
>> RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
>> R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
>> R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

>> Allocated by task 3426:
>>   save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59
>>   save_stack+0x43/0xd0 mm/kasan/kasan.c:447
>>   set_track mm/kasan/kasan.c:459 [inline]
>>   kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:551
>>   kmem_cache_alloc_trace+0x136/0x750 mm/slab.c:3627
>>   kmalloc include/linux/slab.h:493 [inline]
>>   kzalloc include/linux/slab.h:666 [inline]
>>   refill_pi_state_cache.part.6+0xa5/0x2f0 kernel/futex.c:790
>>   refill_pi_state_cache kernel/futex.c:1810 [inline]
>>   futex_requeue+0x1887/0x2370 kernel/futex.c:1877
>>   do_futex+0x7f5/0x20d0 kernel/futex.c:3488
>>   C_SYSC_futex kernel/futex_compat.c:200 [inline]
>>   compat_SyS_futex+0x27f/0x380 kernel/futex_compat.c:174
>>   do_syscall_32_irqs_on arch/x86/entry/common.c:329 [inline]
>>   do_fast_syscall_32+0x3f2/0xf05 arch/x86/entry/common.c:391
>>   entry_SYSENTER_compat+0x51/0x60 arch/x86/entry/entry_64_compat.S:124

>> Freed by task 3417:
>>   save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59
>>   save_stack+0x43/0xd0 mm/kasan/kasan.c:447
>>   set_track mm/kasan/kasan.c:459 [inline]
>>   kasan_slab_free+0x71/0xc0 mm/kasan/kasan.c:524
>>   __cache_free mm/slab.c:3503 [inline]
>>   kfree+0xca/0x250 mm/slab.c:3820
>>   put_pi_state+0x3f4/0x560 kernel/futex.c:852
>>   unqueue_me_pi+0x4a/0xc0 kernel/futex.c:2266
>>   futex_wait_requeue_pi.constprop.19+0xc7f/0x1300 kernel/futex.c:3185
>>   do_futex+0x825/0x20d0 kernel/futex.c:3485
>>   C_SYSC_futex kernel/futex_compat.c:200 [inline]
>>   compat_SyS_futex+0x27f/0x380 kernel/futex_compat.c:174
>>   do_syscall_32_irqs_on arch/x86/entry/common.c:329 [inline]
>>   do_fast_syscall_32+0x3f2/0xf05 arch/x86/entry/common.c:391
>>   entry_SYSENTER_compat+0x51/0x60 arch/x86/entry/entry_64_compat.S:124

>> The buggy address belongs to the object at ffff8801c7497a00
>>   which belongs to the cache kmalloc-256 of size 256
>> The buggy address is located 64 bytes inside of
>>   256-byte region [ffff8801c7497a00, ffff8801c7497b00)
>> The buggy address belongs to the page:
>> page:ffffea00071d25c0 count:1 mapcount:0 mapping:ffff8801c7497000  
>> index:0x0
>> flags: 0x200000000000100(slab)
>> raw: 0200000000000100 ffff8801c7497000 0000000000000000 000000010000000c
>> raw: ffffea00071ebf60 ffffea00071d6920 ffff8801dac007c0 0000000000000000
>> page dumped because: kasan: bad access detected

>> Memory state around the buggy address:
>>   ffff8801c7497900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>>   ffff8801c7497980: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc

>>> ffff8801c7497a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb

>>                                             ^
>>   ffff8801c7497a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>>   ffff8801c7497b00: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
>> ==================================================================


>> ---
>> This bug is generated by a dumb bot. It may contain errors.
>> See https://goo.gl/tpsmEJ for details.
>> Direct all questions to syzkaller@...glegroups.com.

>> syzbot will keep track of this bug report.
>> Once a fix for this bug is committed, please reply to this email with:
>> #syz fix: exact-commit-title
>> To mark this as a duplicate of another syzbot report, please reply with:
>> #syz dup: exact-subject-of-another-report
>> If it's a one-off invalid bug report, please reply with:
>> #syz invalid
>> Note: if the crash happens again, it will cause creation of a new bug
>> report.

>> --
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