audit: type=1400 audit(1566413603.465:39): avc: denied { create } for pid=6931 comm="syz-executor.2" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1 kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access kobject: 'þˆ' (ffff88805c1654f0): kobject_uevent_env general protection fault: 0000 [#1] PREEMPT SMP KASAN Modules linked in: audit: type=1400 audit(1566413603.495:40): avc: denied { write } for pid=6931 comm="syz-executor.2" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1 CPU: 0 PID: 6938 Comm: syz-executor.5 Not tainted 4.14.139 #35 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff88805c0e41c0 task.stack: ffff88805c0e8000 RIP: 0010:__read_once_size include/linux/compiler.h:183 [inline] RIP: 0010:atomic_read arch/x86/include/asm/atomic.h:27 [inline] RIP: 0010:refcount_sub_and_test+0x2b/0xf0 lib/refcount.c:179 RSP: 0018:ffff88805c0efb98 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: ffff8880a484d7c0 RCX: ffffffff842619c0 RDX: 0000000000000004 RSI: 0000000000000020 RDI: 0000000000000001 RBP: ffff88805c0efbc0 R08: 0000000002ee9e37 R09: ffff88805c0e4a88 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000020 R13: 0000000000000001 R14: ffff8880a484d7d4 R15: 0000000000000000 FS: 0000000000aeb940(0000) GS:ffff8880aee00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000001762e80 CR3: 000000008d175000 CR4: 00000000001406f0 audit: type=1400 audit(1566413603.495:41): avc: denied { read } for pid=6931 comm="syz-executor.2" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: refcount_dec_and_test+0x1b/0x20 lib/refcount.c:212 vb2_vmalloc_put+0x18/0x70 drivers/media/v4l2-core/videobuf2-vmalloc.c:68 __vb2_buf_mem_free+0x103/0x1e0 drivers/media/v4l2-core/videobuf2-core.c:240 kobject: 'þˆ' (ffff88805c1654f0): fill_kobj_path: path = '/devices/virtual/net/þˆ' __vb2_free_mem drivers/media/v4l2-core/videobuf2-core.c:409 [inline] __vb2_queue_free+0x634/0x7d0 drivers/media/v4l2-core/videobuf2-core.c:454 vb2_core_queue_release+0x64/0x80 drivers/media/v4l2-core/videobuf2-core.c:2043 vb2_queue_release drivers/media/v4l2-core/videobuf2-v4l2.c:669 [inline] _vb2_fop_release+0x1cf/0x2a0 drivers/media/v4l2-core/videobuf2-v4l2.c:840 vb2_fop_release+0x75/0xc0 drivers/media/v4l2-core/videobuf2-v4l2.c:854 kobject: 'queues' (ffff8880903ecf48): kobject_add_internal: parent: 'þˆ', set: '' vivid_fop_release+0x180/0x3f0 drivers/media/platform/vivid/vivid-core.c:486 kobject: 'queues' (ffff8880903ecf48): kobject_uevent_env v4l2_release+0xf9/0x190 drivers/media/v4l2-core/v4l2-dev.c:446 __fput+0x275/0x7a0 fs/file_table.c:210 ____fput+0x16/0x20 fs/file_table.c:244 task_work_run+0x114/0x190 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x1da/0x220 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4bc/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x413511 RSP: 002b:00007ffdf98e0e70 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000413511 RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 0000000000000000 R08: ffffffffffffffff R09: ffffffffffffffff R10: 00007ffdf98e0f50 R11: 0000000000000293 R12: 000000000075bfc8 R13: 000000000002737e R14: 0000000000760b10 R15: ffffffffffffffff Code: 55 48 89 e5 41 56 41 55 41 89 fd 41 54 49 89 f4 53 48 83 ec 08 e8 96 66 85 fe 4c 89 e2 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <0f> b6 14 02 4c 89 e0 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 RIP: __read_once_size include/linux/compiler.h:183 [inline] RSP: ffff88805c0efb98 RIP: atomic_read arch/x86/include/asm/atomic.h:27 [inline] RSP: ffff88805c0efb98 RIP: refcount_sub_and_test+0x2b/0xf0 lib/refcount.c:179 RSP: ffff88805c0efb98 ---[ end trace 36b101df2175082a ]--- kobject: 'queues' (ffff8880903ecf48): kobject_uevent_env: filter function caused the event to drop!