* Re: KASAN: use-after-free Read in perf_trace_lock_acquire [not found] <94eb2c030a10a6818b055cc8fe1a@google.com> @ 2017-10-31 11:43 ` Dmitry Vyukov 2017-10-31 11:43 ` syzbot 0 siblings, 1 reply; 5+ messages in thread From: Dmitry Vyukov @ 2017-10-31 11:43 UTC (permalink / raw) To: syzbot Cc: dvhart, LKML, Ingo Molnar, Peter Zijlstra, syzkaller-bugs, Thomas Gleixner #syz upstream On Mon, Oct 30, 2017 at 10:53 PM, syzbot <bot+eec541c6a1e7663177fcb48a5814c0a0776c9f68@syzkaller.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@googlegroups.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. > > -- > You received this message because you are subscribed to the Google Groups > "syzkaller-bugs" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to syzkaller-bugs+unsubscribe@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/syzkaller-bugs/94eb2c030a10a6818b055cc8fe1a%40google.com. > For more options, visit https://groups.google.com/d/optout. ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: KASAN: use-after-free Read in perf_trace_lock_acquire 2017-10-31 11:43 ` KASAN: use-after-free Read in perf_trace_lock_acquire Dmitry Vyukov @ 2017-10-31 11:43 ` syzbot 2017-10-31 11:49 ` Dmitry Vyukov 0 siblings, 1 reply; 5+ messages in thread From: syzbot @ 2017-10-31 11:43 UTC (permalink / raw) To: Dmitry Vyukov Cc: dvhart, dvyukov, linux-kernel, mingo, peterz, syzkaller-bugs, tglx > #syz upstream Can't upstream, this is final destination. > On Mon, Oct 30, 2017 at 10:53 PM, syzbot > <bot+eec541c6a1e7663177fcb48a5814c0a0776c9f68@syzkaller.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@googlegroups.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. >> -- >> You received this message because you are subscribed to the Google Groups >> "syzkaller-bugs" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to syzkaller-bugs+unsubscribe@googlegroups.com. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/syzkaller-bugs/94eb2c030a10a6818b055cc8fe1a%40google.com. >> For more options, visit https://groups.google.com/d/optout. ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: KASAN: use-after-free Read in perf_trace_lock_acquire 2017-10-31 11:43 ` syzbot @ 2017-10-31 11:49 ` Dmitry Vyukov 2017-10-31 13:02 ` Peter Zijlstra 0 siblings, 1 reply; 5+ messages in thread From: Dmitry Vyukov @ 2017-10-31 11:49 UTC (permalink / raw) To: syzbot Cc: dvhart, LKML, Ingo Molnar, Peter Zijlstra, syzkaller-bugs, Thomas Gleixner Peter, is this dup of "WARNING in get_pi_state"? https://groups.google.com/d/msg/syzkaller-bugs/jpui-7LJvUw/b77s8UZiAgAJ On Tue, Oct 31, 2017 at 2:43 PM, syzbot <bot+eec541c6a1e7663177fcb48a5814c0a0776c9f68@syzkaller.appspotmail.com> wrote: >> #syz upstream > > > Can't upstream, this is final destination. > > > >> On Mon, Oct 30, 2017 at 10:53 PM, syzbot >> <bot+eec541c6a1e7663177fcb48a5814c0a0776c9f68@syzkaller.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@googlegroups.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. > > >>> -- >>> You received this message because you are subscribed to the Google Groups >>> "syzkaller-bugs" group. >>> To unsubscribe from this group and stop receiving emails from it, send an >>> email to syzkaller-bugs+unsubscribe@googlegroups.com. >>> To view this discussion on the web visit >>> >>> https://groups.google.com/d/msgid/syzkaller-bugs/94eb2c030a10a6818b055cc8fe1a%40google.com. >>> For more options, visit https://groups.google.com/d/optout. ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: KASAN: use-after-free Read in perf_trace_lock_acquire 2017-10-31 11:49 ` Dmitry Vyukov @ 2017-10-31 13:02 ` Peter Zijlstra 2017-10-31 13:14 ` Dmitry Vyukov 0 siblings, 1 reply; 5+ messages in thread From: Peter Zijlstra @ 2017-10-31 13:02 UTC (permalink / raw) To: Dmitry Vyukov Cc: syzbot, dvhart, LKML, Ingo Molnar, syzkaller-bugs, Thomas Gleixner On Tue, Oct 31, 2017 at 02:49:02PM +0300, Dmitry Vyukov wrote: > Peter, is this dup of "WARNING in get_pi_state"? > https://groups.google.com/d/msg/syzkaller-bugs/jpui-7LJvUw/b77s8UZiAgAJ Yep, same race, different outcome. ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: KASAN: use-after-free Read in perf_trace_lock_acquire 2017-10-31 13:02 ` Peter Zijlstra @ 2017-10-31 13:14 ` Dmitry Vyukov 0 siblings, 0 replies; 5+ messages in thread From: Dmitry Vyukov @ 2017-10-31 13:14 UTC (permalink / raw) To: Peter Zijlstra Cc: syzbot, dvhart, LKML, Ingo Molnar, syzkaller-bugs, Thomas Gleixner On Tue, Oct 31, 2017 at 4:02 PM, Peter Zijlstra <peterz@infradead.org> wrote: > On Tue, Oct 31, 2017 at 02:49:02PM +0300, Dmitry Vyukov wrote: >> Peter, is this dup of "WARNING in get_pi_state"? >> https://groups.google.com/d/msg/syzkaller-bugs/jpui-7LJvUw/b77s8UZiAgAJ > > Yep, same race, different outcome. Let's tell the bot #syz dup: WARNING in get_pi_state ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2017-10-31 13:14 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz follow: Atom feed
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[not found] <94eb2c030a10a6818b055cc8fe1a@google.com>
2017-10-31 11:43 ` KASAN: use-after-free Read in perf_trace_lock_acquire Dmitry Vyukov
2017-10-31 11:43 ` syzbot
2017-10-31 11:49 ` Dmitry Vyukov
2017-10-31 13:02 ` Peter Zijlstra
2017-10-31 13:14 ` Dmitry Vyukov
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