| TITLE: KASAN: use-after-free Read in remove_wait_queue |
| |
| [ 19.121820] ================================================================== |
| [ 19.121834] BUG: KASAN: use-after-free in __lock_acquire+0x3c41/0x3cf0 |
| [ 19.121839] Read of size 8 at addr ffff8801c75ea0f8 by task syzkaller992070/3471 |
| [ 19.121840] |
| [ 19.121847] CPU: 1 PID: 3471 Comm: syzkaller992070 Not tainted 4.15.0-rc6-next-20180103+ #87 |
| [ 19.121850] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 |
| [ 19.121852] Call Trace: |
| [ 19.121861] dump_stack+0x137/0x198 |
| [ 19.121867] ? __lock_acquire+0x3c41/0x3cf0 |
| [ 19.121877] print_address_description+0x73/0x250 |
| [ 19.121883] ? __lock_acquire+0x3c41/0x3cf0 |
| [ 19.121889] kasan_report+0x23b/0x360 |
| [ 19.121897] __asan_report_load8_noabort+0x14/0x20 |
| [ 19.121903] __lock_acquire+0x3c41/0x3cf0 |
| [ 19.121908] ? lock_downgrade+0x860/0x860 |
| [ 19.121916] ? __bpf_address_lookup+0x2b0/0x2b0 |
| [ 19.121923] ? __lock_acquire+0x63e/0x3cf0 |
| [ 19.121930] ? remove_wait_queue+0x24/0x1b0 |
| [ 19.121939] ? debug_check_no_locks_freed+0x3c0/0x3c0 |
| [ 19.121947] ? debug_check_no_locks_freed+0x3c0/0x3c0 |
| [ 19.121956] ? __mutex_lock+0xec/0x1550 |
| [ 19.121970] ? ep_free+0x72/0x230 |
| [ 19.121975] ? save_stack+0xa3/0xd0 |
| [ 19.121983] lock_acquire+0x16b/0x420 |
| [ 19.121988] ? lock_acquire+0x16b/0x420 |
| [ 19.121994] ? remove_wait_queue+0x24/0x1b0 |
| [ 19.122007] _raw_spin_lock_irqsave+0x96/0xc0 |
| [ 19.122013] ? remove_wait_queue+0x24/0x1b0 |
| [ 19.122019] remove_wait_queue+0x24/0x1b0 |
| [ 19.122027] ep_unregister_pollwait.isra.7+0x9d/0x360 |
| [ 19.122034] ? ep_free+0x230/0x230 |
| [ 19.122040] ep_free+0xae/0x230 |
| [ 19.122046] ? ep_free+0x230/0x230 |
| [ 19.122052] ep_eventpoll_release+0x44/0x60 |
| [ 19.122058] __fput+0x291/0x6e0 |
| [ 19.122065] ____fput+0x15/0x20 |
| [ 19.122071] task_work_run+0x122/0x1a0 |
| [ 19.122081] do_exit+0x7f4/0x2da0 |
| [ 19.122090] ? binder_ioctl_write_read.isra.39+0x8e0/0x8e0 |
| [ 19.122097] ? do_vfs_ioctl+0x439/0xfe0 |
| [ 19.122104] ? mm_update_next_owner+0x690/0x690 |
| [ 19.122110] ? ioctl_preallocate+0x1c0/0x1c0 |
| [ 19.122117] ? __do_page_fault+0x3c3/0xca0 |
| [ 19.122127] ? entry_SYSCALL_64_fastpath+0x5/0x9a |
| [ 19.122135] do_group_exit+0x108/0x320 |
| [ 19.122142] SyS_exit_group+0x1d/0x20 |
| [ 19.122148] entry_SYSCALL_64_fastpath+0x23/0x9a |
| [ 19.122153] RIP: 0033:0x4429f8 |
| [ 19.122156] RSP: 002b:00007ffc4a4029a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 |
| [ 19.122163] RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 00000000004429f8 |
| [ 19.122166] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 |
| [ 19.122169] RBP: 00000000006ce018 R08: 00000000000000e7 R09: ffffffffffffffd0 |
| [ 19.122172] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401a40 |
| [ 19.122175] R13: 0000000000401ad0 R14: 0000000000000000 R15: 0000000000000000 |
| [ 19.122182] |
| [ 19.122185] Allocated by task 3471: |
| [ 19.122191] save_stack+0x43/0xd0 |
| [ 19.122196] kasan_kmalloc+0xad/0xe0 |
| [ 19.122201] kmem_cache_alloc_trace+0x136/0x750 |
| [ 19.122205] binder_get_thread+0x15d/0x700 |
| [ 19.122209] binder_poll+0x4a/0x210 |
| [ 19.122214] ep_item_poll.isra.10+0xf2/0x320 |
| [ 19.122220] SyS_epoll_ctl+0x11c4/0x27b0 |
| [ 19.122226] entry_SYSCALL_64_fastpath+0x23/0x9a |
| [ 19.122227] |
| [ 19.122229] Freed by task 3471: |
| [ 19.122233] save_stack+0x43/0xd0 |
| [ 19.122238] kasan_slab_free+0x71/0xc0 |
| [ 19.122242] kfree+0xd6/0x260 |
| [ 19.122247] binder_thread_dec_tmpref+0x17d/0x1e0 |
| [ 19.122252] binder_thread_release+0x27d/0x540 |
| [ 19.122256] binder_ioctl+0xa1b/0x10ee |
| [ 19.122261] do_vfs_ioctl+0x190/0xfe0 |
| [ 19.122265] SyS_ioctl+0x8f/0xc0 |
| [ 19.122271] entry_SYSCALL_64_fastpath+0x23/0x9a |
| [ 19.122272] |
| [ 19.122276] The buggy address belongs to the object at ffff8801c75ea040 |
| [ 19.122276] which belongs to the cache kmalloc-512 of size 512 |
| [ 19.122281] The buggy address is located 184 bytes inside of |
| [ 19.122281] 512-byte region [ffff8801c75ea040, ffff8801c75ea240) |
| [ 19.122282] The buggy address belongs to the page: |
| [ 19.122287] page:ffffea00071d7a80 count:1 mapcount:0 mapping:ffff8801c75ea040 index:0x0 |
| [ 19.122292] flags: 0x2fffc0000000100(slab) |
| [ 19.122300] raw: 02fffc0000000100 ffff8801c75ea040 0000000000000000 0000000100000006 |
| [ 19.122307] raw: ffffea00071e1ca0 ffffea00071fd0a0 ffff8801db000940 0000000000000000 |
| [ 19.122309] page dumped because: kasan: bad access detected |
| [ 19.122310] |
| [ 19.122311] Memory state around the buggy address: |
| [ 19.122316] ffff8801c75e9f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc |
| [ 19.122320] ffff8801c75ea000: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb |
| [ 19.122324] >ffff8801c75ea080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb |
| [ 19.122327] ^ |
| [ 19.122331] ffff8801c75ea100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb |
| [ 19.122335] ffff8801c75ea180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb |
| [ 19.122337] ================================================================== |
