================================================================== BUG: KASAN: slab-out-of-bounds in predicate_parse kernel/trace/trace_events_filter.c:557 [inline] BUG: KASAN: slab-out-of-bounds in process_preds+0x191f/0x19d0 kernel/trace/trace_events_filter.c:1509 Write of size 4 at addr ffff8801b1d813f0 by task syz-executor7/15178 CPU: 0 PID: 15178 Comm: syz-executor7 Not tainted 4.17.0+ #39 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+0x1b9/0x294 lib/dump_stack.c:113 print_address_description+0x6c/0x20b mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412 __asan_report_store4_noabort+0x17/0x20 mm/kasan/report.c:437 predicate_parse kernel/trace/trace_events_filter.c:557 [inline] process_preds+0x191f/0x19d0 kernel/trace/trace_events_filter.c:1509 create_filter+0x155/0x270 kernel/trace/trace_events_filter.c:1717 ftrace_profile_set_filter+0x130/0x2e0 kernel/trace/trace_events_filter.c:2042 perf_event_set_filter+0x22e/0x1230 kernel/events/core.c:9078 _perf_ioctl+0x84c/0x15e0 kernel/events/core.c:5059 perf_ioctl+0x59/0x80 kernel/events/core.c:5110 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x1cf/0x16f0 fs/ioctl.c:684 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:701 __do_sys_ioctl fs/ioctl.c:708 [inline] __se_sys_ioctl fs/ioctl.c:706 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:706 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455a99 Code: 1d ba fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 eb b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fb24c16dc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fb24c16e6d4 RCX: 0000000000455a99 RDX: 0000000020000080 RSI: 0000000040082406 RDI: 0000000000000013 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004c4e70 R14: 00000000004cc5d0 R15: 0000000000000000 Allocated by task 6734: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553 kmem_cache_alloc_trace+0x152/0x780 mm/slab.c:3620 kmalloc include/linux/slab.h:513 [inline] inotify_handle_event+0x302/0x500 fs/notify/inotify/inotify_fsnotify.c:101 inotify_ignored_and_remove_idr+0x32/0x80 fs/notify/inotify/inotify_user.c:490 inotify_freeing_mark+0x1d/0x30 fs/notify/inotify/inotify_fsnotify.c:133 fsnotify_free_mark+0xf6/0x150 fs/notify/mark.c:384 fsnotify_destroy_mark+0x3e/0x50 fs/notify/mark.c:393 __do_sys_inotify_rm_watch fs/notify/inotify/inotify_user.c:769 [inline] __se_sys_inotify_rm_watch fs/notify/inotify/inotify_user.c:744 [inline] __x64_sys_inotify_rm_watch+0x121/0x1a0 fs/notify/inotify/inotify_user.c:744 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 2415: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kfree+0xd9/0x260 mm/slab.c:3813 inotify_free_event+0x15/0x20 fs/notify/inotify/inotify_fsnotify.c:182 fsnotify_destroy_event.part.1+0x1a8/0x270 fs/notify/notification.c:87 fsnotify_destroy_event+0x69/0x80 fs/notify/notification.c:74 inotify_read+0x5a8/0x9b0 fs/notify/inotify/inotify_user.c:246 __vfs_read+0x10b/0xa60 fs/read_write.c:416 vfs_read+0x17f/0x3d0 fs/read_write.c:452 ksys_read+0xf9/0x250 fs/read_write.c:578 __do_sys_read fs/read_write.c:588 [inline] __se_sys_read fs/read_write.c:586 [inline] __x64_sys_read+0x73/0xb0 fs/read_write.c:586 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8801b1d81380 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 48 bytes to the right of 64-byte region [ffff8801b1d81380, ffff8801b1d813c0) The buggy address belongs to the page: page:ffffea0006c76040 count:1 mapcount:0 mapping:ffff8801da800340 index:0x0 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffffea0006b8f108 ffffea00071afd08 ffff8801da800340 raw: 0000000000000000 ffff8801b1d81000 0000000100000020 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801b1d81280: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8801b1d81300: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff8801b1d81380: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff8801b1d81400: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc ffff8801b1d81480: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ==================================================================