================================================================== BUG: KASAN: slab-out-of-bounds in predicate_parse kernel/trace/trace_events_filter.c:563 [inline] BUG: KASAN: slab-out-of-bounds in process_preds+0x18f2/0x19d0 kernel/trace/trace_events_filter.c:1508 Read of size 4 at addr ffff8801adce7004 by task syz-executor1/927 CPU: 1 PID: 927 Comm: syz-executor1 Not tainted 4.17.0-rc6+ #23 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_load4_noabort+0x14/0x20 mm/kasan/report.c:432 predicate_parse kernel/trace/trace_events_filter.c:563 [inline] process_preds+0x18f2/0x19d0 kernel/trace/trace_events_filter.c:1508 create_filter+0x155/0x270 kernel/trace/trace_events_filter.c:1716 ftrace_profile_set_filter+0x130/0x2e0 kernel/trace/trace_events_filter.c:2041 perf_event_set_filter+0x248/0x1230 kernel/events/core.c:9079 _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/0x16a0 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:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455a09 RSP: 002b:00007f95d5727c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f95d57286d4 RCX: 0000000000455a09 RDX: 0000000020000300 RSI: 0000000040082406 RDI: 0000000000000013 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000002bf R14: 00000000006f8288 R15: 0000000000000000 Allocated by task 2388: 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 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490 kmem_cache_alloc_node+0x144/0x780 mm/slab.c:3644 __alloc_skb+0x111/0x780 net/core/skbuff.c:193 alloc_skb include/linux/skbuff.h:989 [inline] alloc_uevent_skb+0x89/0x220 lib/kobject_uevent.c:288 uevent_net_broadcast_untagged lib/kobject_uevent.c:324 [inline] kobject_uevent_net_broadcast lib/kobject_uevent.c:406 [inline] kobject_uevent_env+0x866/0x1110 lib/kobject_uevent.c:587 kobject_synth_uevent+0xa4f/0xc0b lib/kobject_uevent.c:208 uevent_store+0x26/0x70 drivers/base/core.c:993 dev_attr_store+0x5e/0x90 drivers/base/core.c:713 sysfs_kf_write+0x118/0x170 fs/sysfs/file.c:139 kernfs_fop_write+0x2ba/0x480 fs/kernfs/file.c:316 __vfs_write+0x10b/0x960 fs/read_write.c:485 vfs_write+0x1f8/0x560 fs/read_write.c:549 ksys_write+0xf9/0x250 fs/read_write.c:598 __do_sys_write fs/read_write.c:610 [inline] __se_sys_write fs/read_write.c:607 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:607 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 2388: 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] kmem_cache_free+0x86/0x2d0 mm/slab.c:3756 kfree_skbmem+0x13c/0x210 net/core/skbuff.c:582 __kfree_skb net/core/skbuff.c:642 [inline] consume_skb+0x193/0x550 net/core/skbuff.c:701 uevent_net_broadcast_untagged lib/kobject_uevent.c:335 [inline] kobject_uevent_net_broadcast lib/kobject_uevent.c:406 [inline] kobject_uevent_env+0x892/0x1110 lib/kobject_uevent.c:587 kobject_synth_uevent+0xa4f/0xc0b lib/kobject_uevent.c:208 uevent_store+0x26/0x70 drivers/base/core.c:993 dev_attr_store+0x5e/0x90 drivers/base/core.c:713 sysfs_kf_write+0x118/0x170 fs/sysfs/file.c:139 kernfs_fop_write+0x2ba/0x480 fs/kernfs/file.c:316 __vfs_write+0x10b/0x960 fs/read_write.c:485 vfs_write+0x1f8/0x560 fs/read_write.c:549 ksys_write+0xf9/0x250 fs/read_write.c:598 __do_sys_write fs/read_write.c:610 [inline] __se_sys_write fs/read_write.c:607 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:607 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8801adce70c0 which belongs to the cache skbuff_head_cache of size 232 The buggy address is located 188 bytes to the left of 232-byte region [ffff8801adce70c0, ffff8801adce71a8) The buggy address belongs to the page: page:ffffea0006b739c0 count:1 mapcount:0 mapping:ffff8801adce70c0 index:0xffff8801adce7840 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffff8801adce70c0 ffff8801adce7840 0000000100000002 raw: ffffea00072d0a60 ffffea0006f6bfe0 ffff8801d9a11080 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801adce6f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8801adce6f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8801adce7000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8801adce7080: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ffff8801adce7100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================