================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x387e/0x4b50 kernel/locking/lockdep.c:3092 Read of size 8 at addr ffff8800b2d3f4b8 by task syz-executor7/8751 CPU: 0 PID: 8751 Comm: syz-executor7 Not tainted 4.4.113-g202e079 #1 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 0000000000000000 4e01d6807a060021 ffff8801d34a7650 ffffffff81d0278d ffffea0002cb4f80 ffff8800b2d3f4b8 0000000000000000 ffff8800b2d3f4b8 0000000000000000 ffff8801d34a7688 ffffffff814fd053 ffff8800b2d3f4b8 Call Trace: [<ffffffff81d0278d>] __dump_stack lib/dump_stack.c:15 [inline] [<ffffffff81d0278d>] dump_stack+0xc1/0x124 lib/dump_stack.c:51 [<ffffffff814fd053>] print_address_description+0x73/0x260 mm/kasan/report.c:252 [<ffffffff814fd565>] kasan_report_error mm/kasan/report.c:351 [inline] [<ffffffff814fd565>] kasan_report+0x285/0x370 mm/kasan/report.c:408 [<ffffffff814fd6c4>] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:429 [<ffffffff81239c3e>] __lock_acquire+0x387e/0x4b50 kernel/locking/lockdep.c:3092 netlink: 11 bytes leftover after parsing attributes in process `syz-executor0'. netlink: 11 bytes leftover after parsing attributes in process `syz-executor0'. [<ffffffff8123c77e>] lock_acquire+0x15e/0x460 kernel/locking/lockdep.c:3592 [<ffffffff8377172e>] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:112 [inline] [<ffffffff8377172e>] _raw_spin_lock_irqsave+0x4e/0x70 kernel/locking/spinlock.c:159 [<ffffffff8121f0a4>] remove_wait_queue+0x14/0x40 kernel/sched/wait.c:49 [<ffffffff815f57d8>] ep_remove_wait_queue fs/eventpoll.c:530 [inline] [<ffffffff815f57d8>] ep_unregister_pollwait.isra.6+0xa8/0x220 fs/eventpoll.c:548 [<ffffffff815f6503>] ep_free+0x93/0x1c0 fs/eventpoll.c:765 [<ffffffff815f6674>] ep_eventpoll_release+0x44/0x60 fs/eventpoll.c:797 [<ffffffff81522363>] __fput+0x233/0x6d0 fs/file_table.c:208 [<ffffffff81522885>] ____fput+0x15/0x20 fs/file_table.c:244 [<ffffffff8118b9d4>] task_work_run+0x104/0x180 kernel/task_work.c:115 [<ffffffff81132f7a>] exit_task_work include/linux/task_work.h:21 [inline] [<ffffffff81132f7a>] do_exit+0x82a/0x2a10 kernel/exit.c:755 [<ffffffff81139418>] do_group_exit+0x108/0x320 kernel/exit.c:885 [<ffffffff8115c872>] get_signal+0x4f2/0x1550 kernel/signal.c:2317 [<ffffffff8100e7fb>] do_signal+0x8b/0x1d40 arch/x86/kernel/signal.c:712 [<ffffffff810035fa>] exit_to_usermode_loop+0x11a/0x160 arch/x86/entry/common.c:247 [<ffffffff81006535>] prepare_exit_to_usermode arch/x86/entry/common.c:282 [inline] [<ffffffff81006535>] syscall_return_slowpath+0x1b5/0x1f0 arch/x86/entry/common.c:347 [<ffffffff83771ce9>] int_ret_from_sys_call+0x25/0xa3 Allocated by task 8747: [<ffffffff81035df6>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63 [<ffffffff814fc0c3>] save_stack+0x43/0xd0 mm/kasan/kasan.c:512 [<ffffffff814fc38d>] set_track mm/kasan/kasan.c:524 [inline] [<ffffffff814fc38d>] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:616 [<ffffffff814f8310>] kmem_cache_alloc_trace+0x100/0x2b0 mm/slub.c:2642 [<ffffffff82c7b46d>] kmalloc include/linux/slab.h:476 [inline] [<ffffffff82c7b46d>] kzalloc include/linux/slab.h:620 [inline] [<ffffffff82c7b46d>] binder_get_thread+0x15d/0x750 drivers/android/binder.c:4452 [<ffffffff82c7baaa>] binder_poll+0x4a/0x210 drivers/android/binder.c:4555 [<ffffffff815f9651>] ep_item_poll fs/eventpoll.c:806 [inline] [<ffffffff815f9651>] ep_insert fs/eventpoll.c:1319 [inline] [<ffffffff815f9651>] SYSC_epoll_ctl fs/eventpoll.c:1934 [inline] [<ffffffff815f9651>] SyS_epoll_ctl+0x10b1/0x2040 fs/eventpoll.c:1833 [<ffffffff83771b5f>] entry_SYSCALL_64_fastpath+0x1c/0x98 Freed by task 8747: [<ffffffff81035df6>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63 [<ffffffff814fc0c3>] save_stack+0x43/0xd0 mm/kasan/kasan.c:512 [<ffffffff814fc9e2>] set_track mm/kasan/kasan.c:524 [inline] [<ffffffff814fc9e2>] kasan_slab_free+0x72/0xc0 mm/kasan/kasan.c:589 [<ffffffff814f947c>] slab_free_hook mm/slub.c:1383 [inline] [<ffffffff814f947c>] slab_free_freelist_hook mm/slub.c:1405 [inline] [<ffffffff814f947c>] slab_free mm/slub.c:2859 [inline] [<ffffffff814f947c>] kfree+0xfc/0x300 mm/slub.c:3749 [<ffffffff82c749d1>] binder_free_thread drivers/android/binder.c:4480 [inline] [<ffffffff82c749d1>] binder_thread_dec_tmpref+0x1c1/0x250 drivers/android/binder.c:2036 [<ffffffff82c7550d>] binder_thread_release+0x27d/0x540 drivers/android/binder.c:4544 [<ffffffff82c90134>] binder_ioctl+0xb94/0x12e0 drivers/android/binder.c:4760 [<ffffffff815588ca>] vfs_ioctl fs/ioctl.c:43 [inline] [<ffffffff815588ca>] do_vfs_ioctl+0x7aa/0xee0 fs/ioctl.c:607 [<ffffffff8155908f>] SYSC_ioctl fs/ioctl.c:622 [inline] [<ffffffff8155908f>] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:613 [<ffffffff83771b5f>] entry_SYSCALL_64_fastpath+0x1c/0x98 The buggy address belongs to the object at ffff8800b2d3f400 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 184 bytes inside of 512-byte region [ffff8800b2d3f400, ffff8800b2d3f600) The buggy address belongs to the page: ------------[ cut here ]------------ kernel BUG at include/linux/mm.h:460! invalid opcode: 0000 [#1] PREEMPT SMP KASAN Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.4.113-g202e079 #1 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8801da3a97c0 task.stack: ffff8801da3b8000 RIP: 0010:[<ffffffff8148f8e1>] [<ffffffff8148f8e1>] dump_page mm/debug.c:105 [inline] RIP: 0010:[<ffffffff8148f8e1>] [<ffffffff8148f8e1>] page_mapcount include/linux/mm.h:460 [inline] RIP: 0010:[<ffffffff8148f8e1>] [<ffffffff8148f8e1>] dump_page_badflags+0x191/0x250 mm/debug.c:85 RSP: 0018:ffff8801db307df0 EFLAGS: 00010006 RAX: ffff8801da3a97c0 RBX: ffff8801d1004290 RCX: ffffffff812ac810 RDX: 0000000000010000 RSI: ffffffff839fe320 RDI: ffff8801d1004290 RBP: ffff8801db307ee0 R08: 1ffff1001705807a R09: 0000000000000001 R10: 0000000000000000 R11: 1ffff1003b660f6a R12: ffffffff8148f8e1 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8801db319640 FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000006faad4 CR3: 00000000b0542000 CR4: 0000000000160670 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Stack: ffffffff812ac816 ffff88021fffd057 ffff88021fffd05b ffff88021fffd04f 1ffff1003b660fcb ffff8801db3196a0 ffffed003b660fca ffff8801db319780 0303fc0000000001 ffff8801db319678 ffffed003b6632d4 ffff8801db319798 Call Trace: <IRQ> [<ffffffff812aece6>] hrtimer_interrupt+0x1a6/0x440 kernel/time/hrtimer.c:1351 [<ffffffff810b0c7a>] local_apic_timer_interrupt+0x6a/0xb0 arch/x86/kernel/apic/apic.c:901 [<ffffffff837747b6>] smp_apic_timer_interrupt+0x76/0xa0 arch/x86/kernel/apic/apic.c:925 [<ffffffff83773710>] apic_timer_interrupt+0xa0/0xb0 arch/x86/entry/entry_64.S:737 <EOI> [<ffffffff81027ed5>] arch_safe_halt arch/x86/include/asm/paravirt.h:117 [inline] [<ffffffff81027ed5>] default_idle+0x55/0x3c0 arch/x86/kernel/process.c:291 [<ffffffff8102945a>] arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:282 [<ffffffff81220418>] default_idle_call+0x48/0x70 kernel/sched/idle.c:93 [<ffffffff81220b1d>] cpuidle_idle_call kernel/sched/idle.c:157 [inline] [<ffffffff81220b1d>] cpu_idle_loop kernel/sched/idle.c:253 [inline] [<ffffffff81220b1d>] cpu_startup_entry+0x5fd/0x8f0 kernel/sched/idle.c:301 [<ffffffff810adaf4>] start_secondary+0x304/0x3e0 arch/x86/kernel/smpboot.c:242 Code: 46 e8 64 03 ed ff 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 50 03 ed ff 31 d2 48 c7 c6 e0 8d 8a 83 48 89 df e8 6f fe ff ff <0f> 0b e8 a8 dd 06 00 e9 21 ff ff ff 89 4d d4 e8 9b dd 06 00 8b RIP [<ffffffff8148f8e1>] dump_page mm/debug.c:105 [inline] RIP [<ffffffff8148f8e1>] page_mapcount include/linux/mm.h:460 [inline] RIP [<ffffffff8148f8e1>] dump_page_badflags+0x191/0x250 mm/debug.c:85 RSP <ffff8801db307df0> ---[ end trace 82af7bca7c306bb0 ]---