From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752799AbdJaLna (ORCPT ); Tue, 31 Oct 2017 07:43:30 -0400 Received: from mail-io0-f197.google.com ([209.85.223.197]:42069 "EHLO mail-io0-f197.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751608AbdJaLn2 (ORCPT ); Tue, 31 Oct 2017 07:43:28 -0400 X-Google-Smtp-Source: ABhQp+R6CDIqUJtoVLLb0oYa+nG5RbcdrNT9N0178HtN7XKo/i8SLJONchUcjYy0zQun/aP2DlSNFbvfA3eQCIhzZQkmDnneexhF MIME-Version: 1.0 Date: Tue, 31 Oct 2017 04:43:27 -0700 In-Reply-To: X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <001a1140f3e268c996055cd6434b@google.com> Subject: Re: KASAN: use-after-free Read in perf_trace_lock_acquire From: syzbot To: Dmitry Vyukov Cc: dvhart@infradead.org, dvyukov@google.com, linux-kernel@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, syzkaller-bugs@googlegroups.com, tglx@linutronix.de Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > #syz upstream Can't upstream, this is final destination. > On Mon, Oct 30, 2017 at 10:53 PM, syzbot > > 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.