================================================================== BUG: KASAN: use-after-free in kill_fasync+0x306/0x310 fs/fcntl.c:1023 Read of size 8 at addr ffff8880327de568 by task kworker/1:1/34 CPU: 1 PID: 34 Comm: kworker/1:1 Not tainted 5.11.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022 Workqueue: events key_garbage_collector Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x9a/0xcc lib/dump_stack.c:120 print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:230 __kasan_report mm/kasan/report.c:396 [inline] kasan_report.cold+0x79/0xd5 mm/kasan/report.c:413 kill_fasync+0x306/0x310 fs/fcntl.c:1023 remove_watch_from_object+0x2cc/0x840 kernel/watch_queue.c:525 remove_watch_list include/linux/watch_queue.h:114 [inline] key_gc_unused_keys.constprop.0+0x290/0x580 security/keys/gc.c:135 key_garbage_collector+0x266/0x710 security/keys/gc.c:297 process_one_work+0x84c/0x13b0 kernel/workqueue.c:2275 worker_thread+0x598/0xf80 kernel/workqueue.c:2421 kthread+0x36f/0x450 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Allocated by task 5957: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:401 [inline] ____kasan_kmalloc.constprop.0+0x82/0xa0 mm/kasan/common.c:429 kmalloc include/linux/slab.h:552 [inline] kzalloc include/linux/slab.h:682 [inline] alloc_pipe_info+0xd5/0x490 fs/pipe.c:774 get_pipe_inode fs/pipe.c:863 [inline] create_pipe_files+0x85/0x890 fs/pipe.c:895 __do_pipe_flags fs/pipe.c:944 [inline] do_pipe2+0x78/0x150 fs/pipe.c:992 __do_sys_pipe2 fs/pipe.c:1010 [inline] __se_sys_pipe2 fs/pipe.c:1008 [inline] __x64_sys_pipe2+0x4b/0x70 fs/pipe.c:1008 do_syscall_64+0x2d/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 5954: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:356 ____kasan_slab_free+0xe1/0x110 mm/kasan/common.c:362 kasan_slab_free include/linux/kasan.h:192 [inline] slab_free_hook mm/slub.c:1547 [inline] slab_free_freelist_hook+0x5d/0x150 mm/slub.c:1580 slab_free mm/slub.c:3143 [inline] kfree+0xdb/0x3b0 mm/slub.c:4139 put_pipe_info fs/pipe.c:695 [inline] pipe_release+0x220/0x270 fs/pipe.c:718 __fput+0x204/0x870 fs/file_table.c:280 task_work_run+0xc0/0x160 kernel/task_work.c:140 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:174 [inline] exit_to_user_mode_prepare+0x249/0x250 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The buggy address belongs to the object at ffff8880327de400 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 360 bytes inside of 512-byte region [ffff8880327de400, ffff8880327de600) The buggy address belongs to the page: page:0000000034b60cb9 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x327dc head:0000000034b60cb9 order:2 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head) raw: 00fff00000010200 dead000000000100 dead000000000122 ffff88800f441280 raw: 0000000000000000 0000000000100010 00000001ffffffff ffff888010dee201 page dumped because: kasan: bad access detected pages's memcg:ffff888010dee201 page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 5888, ts 84598164603 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x144/0x1c0 mm/page_alloc.c:2297 prep_new_page mm/page_alloc.c:2306 [inline] get_page_from_freelist+0x1c6e/0x3f80 mm/page_alloc.c:3945 __alloc_pages_nodemask+0x2d6/0x730 mm/page_alloc.c:4995 alloc_pages include/linux/gfp.h:547 [inline] alloc_slab_page mm/slub.c:1618 [inline] allocate_slab+0x2b6/0x4a0 mm/slub.c:1758 new_slab mm/slub.c:1821 [inline] new_slab_objects mm/slub.c:2578 [inline] ___slab_alloc+0x476/0x790 mm/slub.c:2741 __slab_alloc.constprop.0+0x95/0xe0 mm/slub.c:2781 slab_alloc_node mm/slub.c:2857 [inline] __kmalloc_node_track_caller+0x1ad/0x3f0 mm/slub.c:4510 __kmalloc_reserve net/core/skbuff.c:142 [inline] __alloc_skb+0x7f/0x4e0 net/core/skbuff.c:210 alloc_skb include/linux/skbuff.h:1099 [inline] netlink_alloc_large_skb net/netlink/af_netlink.c:1176 [inline] netlink_sendmsg+0x7ea/0xbe0 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xab/0xe0 net/socket.c:672 __sys_sendto+0x1a4/0x270 net/socket.c:1975 __do_sys_sendto net/socket.c:1987 [inline] __se_sys_sendto net/socket.c:1983 [inline] __x64_sys_sendto+0xd8/0x1b0 net/socket.c:1983 do_syscall_64+0x2d/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1271 [inline] __free_pages_ok+0x4da/0xed0 mm/page_alloc.c:1536 unfreeze_partials+0x16c/0x1b0 mm/slub.c:2359 put_cpu_partial+0x129/0x200 mm/slub.c:2395 qlink_free mm/kasan/quarantine.c:146 [inline] qlist_free_all+0x5a/0xc0 mm/kasan/quarantine.c:165 quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:272 ____kasan_kmalloc.constprop.0+0x98/0xa0 mm/kasan/common.c:412 kasan_slab_alloc include/linux/kasan.h:209 [inline] slab_post_alloc_hook mm/slab.h:512 [inline] slab_alloc_node mm/slub.c:2892 [inline] slab_alloc mm/slub.c:2900 [inline] kmem_cache_alloc_trace+0x1be/0x360 mm/slub.c:2917 kmalloc include/linux/slab.h:552 [inline] kzalloc include/linux/slab.h:682 [inline] keypair_create drivers/net/wireguard/noise.c:100 [inline] wg_noise_handshake_begin_session+0xc4/0xbd0 drivers/net/wireguard/noise.c:794 wg_packet_send_handshake_response+0x1b9/0x2a0 drivers/net/wireguard/send.c:96 wg_receive_handshake_packet+0x199/0x9b0 drivers/net/wireguard/receive.c:161 wg_packet_handshake_receive_worker+0x3b/0x80 drivers/net/wireguard/receive.c:220 process_one_work+0x84c/0x13b0 kernel/workqueue.c:2275 worker_thread+0x598/0xf80 kernel/workqueue.c:2421 kthread+0x36f/0x450 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Memory state around the buggy address: ffff8880327de400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880327de480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880327de500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880327de580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880327de600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================