================================================================== 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+0x1958/0x19b0 kernel/trace/trace_events_filter.c:1505 Write of size 4 at addr ffff8801cf5782f0 by task syzkaller146357/4463 CPU: 1 PID: 4463 Comm: syzkaller146357 Not tainted 4.16.0+ #3 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+0x1958/0x19b0 kernel/trace/trace_events_filter.c:1505 create_filter+0x155/0x270 kernel/trace/trace_events_filter.c:1713 ftrace_profile_set_filter+0x130/0x2e0 kernel/trace/trace_events_filter.c:2038 perf_event_set_filter+0x248/0x1230 kernel/events/core.c:9064 _perf_ioctl+0x84c/0x15e0 kernel/events/core.c:5056 perf_ioctl+0x59/0x80 kernel/events/core.c:5107 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 SYSC_ioctl fs/ioctl.c:708 [inline] SyS_ioctl+0x24/0x30 fs/ioctl.c:706 do_syscall_64+0x29e/0x9d0 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x43fe09 RSP: 002b:00007fffe46638f8 EFLAGS: 00000217 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fe09 RDX: 0000000020000040 RSI: 0000000040082406 RDI: 0000000000000004 RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 R10: 00000000004002c8 R11: 0000000000000217 R12: 0000000000401730 R13: 00000000004017c0 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 1: 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 __do_kmalloc mm/slab.c:3718 [inline] __kmalloc+0x14e/0x760 mm/slab.c:3727 kmalloc include/linux/slab.h:517 [inline] kzalloc include/linux/slab.h:701 [inline] kobject_get_path+0xc2/0x1a0 lib/kobject.c:152 kobject_uevent_env+0x234/0xea0 lib/kobject_uevent.c:451 kobject_uevent+0x1f/0x30 lib/kobject_uevent.c:568 driver_bound+0x1a3/0x220 drivers/base/dd.c:288 really_probe drivers/base/dd.c:481 [inline] driver_probe_device+0x733/0x960 drivers/base/dd.c:590 __driver_attach+0x1b2/0x1f0 drivers/base/dd.c:824 bus_for_each_dev+0x151/0x1d0 drivers/base/bus.c:311 driver_attach+0x3d/0x50 drivers/base/dd.c:843 bus_add_driver+0x4b2/0x600 drivers/base/bus.c:667 driver_register+0x1bf/0x320 drivers/base/driver.c:166 register_virtio_driver+0x79/0xd0 drivers/virtio/virtio.c:296 is_blacklisted_cpu arch/x86/crypto/camellia_glue.c:1473 [inline] init+0xa3/0x114 arch/x86/crypto/camellia_glue.c:1494 do_one_initcall+0x127/0x913 init/main.c:883 do_initcall_level init/main.c:951 [inline] do_initcalls init/main.c:959 [inline] do_basic_setup init/main.c:977 [inline] kernel_init_freeable+0x49b/0x58e init/main.c:1127 kernel_init+0x11/0x1b3 init/main.c:1053 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:411 Freed by task 1: 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 kobject_uevent_env+0x275/0xea0 lib/kobject_uevent.c:551 kobject_uevent+0x1f/0x30 lib/kobject_uevent.c:568 driver_bound+0x1a3/0x220 drivers/base/dd.c:288 really_probe drivers/base/dd.c:481 [inline] driver_probe_device+0x733/0x960 drivers/base/dd.c:590 __driver_attach+0x1b2/0x1f0 drivers/base/dd.c:824 bus_for_each_dev+0x151/0x1d0 drivers/base/bus.c:311 driver_attach+0x3d/0x50 drivers/base/dd.c:843 bus_add_driver+0x4b2/0x600 drivers/base/bus.c:667 driver_register+0x1bf/0x320 drivers/base/driver.c:166 register_virtio_driver+0x79/0xd0 drivers/virtio/virtio.c:296 is_blacklisted_cpu arch/x86/crypto/camellia_glue.c:1473 [inline] init+0xa3/0x114 arch/x86/crypto/camellia_glue.c:1494 do_one_initcall+0x127/0x913 init/main.c:883 do_initcall_level init/main.c:951 [inline] do_initcalls init/main.c:959 [inline] do_basic_setup init/main.c:977 [inline] kernel_init_freeable+0x49b/0x58e init/main.c:1127 kernel_init+0x11/0x1b3 init/main.c:1053 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:411 The buggy address belongs to the object at ffff8801cf578280 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 48 bytes to the right of 64-byte region [ffff8801cf578280, ffff8801cf5782c0) The buggy address belongs to the page: page:ffffea00073d5e00 count:1 mapcount:0 mapping:ffff8801cf578000 index:0x0 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffff8801cf578000 0000000000000000 0000000100000020 raw: ffffea00073922e0 ffffea00073d4620 ffff8801dac00340 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801cf578180: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc ffff8801cf578200: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc >ffff8801cf578280: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff8801cf578300: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc ffff8801cf578380: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ==================================================================