================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x2d5e/0x3fb0 kernel/locking/lockdep.c:3573 Read of size 8 at addr ffff8880a8ff9880 by task syz-executor.1/19241 CPU: 0 PID: 19241 Comm: syz-executor.1 Not tainted 5.1.0-rc1+ #35 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x172/0x1f0 lib/dump_stack.c:113 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:187 kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:132 __lock_acquire+0x2d5e/0x3fb0 kernel/locking/lockdep.c:3573 lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:4211 __mutex_lock_common kernel/locking/mutex.c:925 [inline] __mutex_lock+0xf7/0x1310 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 seccomp_notify_release+0x62/0x280 kernel/seccomp.c:984 __fput+0x2e5/0x8d0 fs/file_table.c:278 ____fput+0x16/0x20 fs/file_table.c:309 task_work_run+0x14a/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x273/0x2c0 arch/x86/entry/common.c:166 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x52d/0x610 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x411fc1 Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 e4 1a 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007ffc9d4c1970 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000411fc1 RDX: 0000001b2e420000 RSI: 00000000007402a8 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00000000e0b0ea62 R09: 00000000e0b0ea66 R10: 00007ffc9d4c18a0 R11: 0000000000000293 R12: 0000000000000000 R13: 00007ffc9d4c19b0 R14: 0000000000000000 R15: 00007ffc9d4c19c0 Allocated by task 19254: save_stack+0x45/0xd0 mm/kasan/common.c:75 set_track mm/kasan/common.c:87 [inline] __kasan_kmalloc mm/kasan/common.c:497 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:470 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:511 kmem_cache_alloc_trace+0x151/0x760 mm/slab.c:3621 kmalloc include/linux/slab.h:545 [inline] kzalloc include/linux/slab.h:740 [inline] seccomp_prepare_filter kernel/seccomp.c:453 [inline] seccomp_prepare_user_filter kernel/seccomp.c:493 [inline] seccomp_set_mode_filter kernel/seccomp.c:1262 [inline] do_seccomp+0x743/0x2250 kernel/seccomp.c:1376 __do_sys_seccomp kernel/seccomp.c:1395 [inline] __se_sys_seccomp kernel/seccomp.c:1392 [inline] __x64_sys_seccomp+0x73/0xb0 kernel/seccomp.c:1392 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 19254: save_stack+0x45/0xd0 mm/kasan/common.c:75 set_track mm/kasan/common.c:87 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:459 kasan_slab_free+0xe/0x10 mm/kasan/common.c:467 __cache_free mm/slab.c:3498 [inline] kfree+0xcf/0x230 mm/slab.c:3821 seccomp_filter_free kernel/seccomp.c:567 [inline] seccomp_filter_free kernel/seccomp.c:563 [inline] seccomp_set_mode_filter kernel/seccomp.c:1317 [inline] do_seccomp+0xb00/0x2250 kernel/seccomp.c:1376 __do_sys_seccomp kernel/seccomp.c:1395 [inline] __se_sys_seccomp kernel/seccomp.c:1392 [inline] __x64_sys_seccomp+0x73/0xb0 kernel/seccomp.c:1392 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8880a8ff9800 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 128 bytes inside of 192-byte region [ffff8880a8ff9800, ffff8880a8ff98c0) The buggy address belongs to the page: page:ffffea0002a3fe40 count:1 mapcount:0 mapping:ffff88812c3f0040 index:0x0 flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffffea00024ebb88 ffffea0002a36ac8 ffff88812c3f0040 raw: 0000000000000000 ffff8880a8ff9000 0000000100000010 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a8ff9780: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8880a8ff9800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880a8ff9880: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff8880a8ff9900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880a8ff9980: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ==================================================================