================================================================== BUG: KASAN: use-after-free in __post_watch_notification+0x204/0x8d0 kernel/watch_queue.c:223 Read of size 8 at addr ffff888025dfe610 by task syz-executor.0/4264 CPU: 1 PID: 4264 Comm: syz-executor.0 Not tainted 5.19.0-rc8-syzkaller-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 print_address_description+0x65/0x4b0 mm/kasan/report.c:313 print_report+0xf4/0x210 mm/kasan/report.c:429 kasan_report+0xfb/0x130 mm/kasan/report.c:491 __post_watch_notification+0x204/0x8d0 kernel/watch_queue.c:223 post_watch_notification include/linux/watch_queue.h:109 [inline] notify_key security/keys/internal.h:199 [inline] __key_update+0x428/0x4e0 security/keys/key.c:775 key_create_or_update+0xa8f/0xd60 security/keys/key.c:979 __do_sys_add_key security/keys/keyctl.c:134 [inline] __se_sys_add_key+0x338/0x480 security/keys/keyctl.c:74 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7ff80ba89209 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ff80cc25168 EFLAGS: 00000246 ORIG_RAX: 00000000000000f8 RAX: ffffffffffffffda RBX: 00007ff80bb9bf60 RCX: 00007ff80ba89209 RDX: 00000000200000c0 RSI: 0000000020000080 RDI: 0000000020000040 RBP: 00007ff80bae3161 R08: fffffffffffffffc R09: 0000000000000000 R10: 0000000000000048 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc7598cc4f R14: 00007ff80cc25300 R15: 0000000000022000 Allocated by task 4246: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:436 [inline] ____kasan_kmalloc+0xdc/0x110 mm/kasan/common.c:515 kasan_kmalloc include/linux/kasan.h:234 [inline] kmem_cache_alloc_trace+0x94/0x310 mm/slub.c:3284 kmalloc include/linux/slab.h:600 [inline] kzalloc include/linux/slab.h:733 [inline] watch_queue_init+0x4f/0x140 kernel/watch_queue.c:678 create_pipe_files+0x478/0x6e0 fs/pipe.c:921 __do_pipe_flags+0x46/0x200 fs/pipe.c:962 do_pipe2+0xd0/0x300 fs/pipe.c:1010 __do_sys_pipe2 fs/pipe.c:1028 [inline] __se_sys_pipe2 fs/pipe.c:1026 [inline] __x64_sys_pipe2+0x56/0x60 fs/pipe.c:1026 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 26: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4c/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0xd8/0x110 mm/kasan/common.c:366 kasan_slab_free include/linux/kasan.h:200 [inline] slab_free_hook mm/slub.c:1754 [inline] slab_free_freelist_hook+0x12e/0x1a0 mm/slub.c:1780 slab_free mm/slub.c:3536 [inline] kmem_cache_free_bulk+0x105/0x1d0 mm/slub.c:3683 kfree_bulk include/linux/slab.h:456 [inline] kfree_rcu_work+0x35b/0x7c0 kernel/rcu/tree.c:3370 process_one_work+0x81c/0xd10 kernel/workqueue.c:2289 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436 kthread+0x266/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 Last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:348 kvfree_call_rcu+0x118/0x840 kernel/rcu/tree.c:3647 free_watch+0x3c/0x130 kernel/watch_queue.c:423 rcu_do_batch kernel/rcu/tree.c:2578 [inline] rcu_core+0xa0c/0x16d0 kernel/rcu/tree.c:2838 __do_softirq+0x382/0x793 kernel/softirq.c:571 Second to last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:348 insert_work+0x54/0x3e0 kernel/workqueue.c:1358 __queue_work+0x969/0xc20 kernel/workqueue.c:1517 queue_work_on+0x137/0x240 kernel/workqueue.c:1545 queue_work include/linux/workqueue.h:502 [inline] call_usermodehelper_exec+0x26d/0x430 kernel/umh.c:435 kobject_uevent_env+0x7df/0x8e0 lib/kobject_uevent.c:618 driver_register+0x399/0x3e0 drivers/base/driver.c:248 __hid_register_driver+0x126/0x170 drivers/hid/hid-core.c:2864 do_one_initcall+0xbd/0x2b0 init/main.c:1295 do_initcall_level+0x168/0x218 init/main.c:1368 do_initcalls+0x4b/0x8c init/main.c:1384 kernel_init_freeable+0x43a/0x5c3 init/main.c:1610 kernel_init+0x19/0x2b0 init/main.c:1499 ret_from_fork+0x1f/0x30 The buggy address belongs to the object at ffff888025dfe600 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 16 bytes inside of 192-byte region [ffff888025dfe600, ffff888025dfe6c0) The buggy address belongs to the physical page: page:ffffea0000977f80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x25dfe flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 dead000000000100 dead000000000122 ffff888011c41a00 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 1, tgid 1 (swapper/0), ts 8881199979, free_ts 0 prep_new_page mm/page_alloc.c:2456 [inline] get_page_from_freelist+0x72b/0x7a0 mm/page_alloc.c:4198 __alloc_pages+0x259/0x560 mm/page_alloc.c:5426 alloc_page_interleave+0x22/0x1c0 mm/mempolicy.c:2105 alloc_slab_page+0x70/0xf0 mm/slub.c:1824 allocate_slab+0x5e/0x520 mm/slub.c:1969 new_slab mm/slub.c:2029 [inline] ___slab_alloc+0x42e/0xce0 mm/slub.c:3031 __slab_alloc mm/slub.c:3118 [inline] slab_alloc_node mm/slub.c:3209 [inline] slab_alloc mm/slub.c:3251 [inline] kmem_cache_alloc_trace+0x25c/0x310 mm/slub.c:3282 kmalloc include/linux/slab.h:600 [inline] kzalloc include/linux/slab.h:733 [inline] call_usermodehelper_setup+0x8a/0x260 kernel/umh.c:365 kobject_uevent_env+0x7c1/0x8e0 lib/kobject_uevent.c:614 driver_register+0x399/0x3e0 drivers/base/driver.c:248 __hid_register_driver+0x126/0x170 drivers/hid/hid-core.c:2864 do_one_initcall+0xbd/0x2b0 init/main.c:1295 do_initcall_level+0x168/0x218 init/main.c:1368 do_initcalls+0x4b/0x8c init/main.c:1384 kernel_init_freeable+0x43a/0x5c3 init/main.c:1610 kernel_init+0x19/0x2b0 init/main.c:1499 page_owner free stack trace missing Memory state around the buggy address: ffff888025dfe500: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888025dfe580: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff888025dfe600: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888025dfe680: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888025dfe700: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================