================================================================== BUG: KASAN: use-after-free in __wake_up_common+0x637/0x650 kernel/sched/wait.c:100 Read of size 8 at addr ffff88801b8d34b0 by task iou-wrk-12176/12186 CPU: 1 PID: 12186 Comm: iou-wrk-12176 Not tainted 5.19.0-rc4-next-20220628-syzkaller #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+0xcd/0x134 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:317 [inline] print_report.cold+0x2ba/0x719 mm/kasan/report.c:433 kasan_report+0xbe/0x1f0 mm/kasan/report.c:495 __wake_up_common+0x637/0x650 kernel/sched/wait.c:100 __wake_up_common_lock+0xd0/0x130 kernel/sched/wait.c:137 pty_close+0x11b/0x4f0 drivers/tty/pty.c:59 tty_release+0x45e/0x1200 drivers/tty/tty_io.c:1758 __fput+0x277/0x9d0 fs/file_table.c:317 task_work_run+0xdd/0x1a0 kernel/task_work.c:177 get_signal+0x1c5/0x2600 kernel/signal.c:2634 io_wqe_worker+0x73c/0xe90 io_uring/io-wq.c:653 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302 Allocated by task 12176: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:436 [inline] ____kasan_kmalloc mm/kasan/common.c:515 [inline] ____kasan_kmalloc mm/kasan/common.c:474 [inline] __kasan_kmalloc+0xa9/0xd0 mm/kasan/common.c:524 kmalloc include/linux/slab.h:600 [inline] __io_queue_proc+0x2dc/0x950 io_uring/poll.c:429 poll_wait include/linux/poll.h:49 [inline] n_tty_poll+0xb4/0x8a0 drivers/tty/n_tty.c:2425 tty_poll+0x139/0x1b0 drivers/tty/tty_io.c:2212 vfs_poll include/linux/poll.h:88 [inline] __io_arm_poll_handler+0x488/0x1060 io_uring/poll.c:511 io_arm_poll_handler+0x5c6/0xce0 io_uring/poll.c:638 io_queue_async+0xc1/0x3e0 io_uring/io_uring.c:1753 io_queue_sqe io_uring/io_uring.c:1787 [inline] io_submit_sqe io_uring/io_uring.c:2036 [inline] io_submit_sqes+0x15fc/0x1ec0 io_uring/io_uring.c:2147 __do_sys_io_uring_enter+0xb85/0x1eb0 io_uring/io_uring.c:3087 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 Freed by task 12186: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track+0x21/0x30 mm/kasan/common.c:45 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free+0x166/0x1c0 mm/kasan/common.c:328 kasan_slab_free include/linux/kasan.h:200 [inline] slab_free_hook mm/slub.c:1754 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1780 slab_free mm/slub.c:3534 [inline] kfree+0xe2/0x4d0 mm/slub.c:4562 io_clean_op+0x1b1/0xa40 io_uring/io_uring.c:1555 io_dismantle_req io_uring/io_uring.c:930 [inline] io_free_req+0xc9/0x299 io_uring/io_uring.c:940 io_put_req_find_next io_uring/io_uring.c:1236 [inline] io_wq_free_work.cold+0x62/0x67 io_uring/io_uring.c:1636 io_worker_handle_work+0xc48/0x1c60 io_uring/io-wq.c:590 io_wqe_worker+0x640/0xe90 io_uring/io-wq.c:634 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302 The buggy address belongs to the object at ffff88801b8d3480 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 48 bytes inside of 64-byte region [ffff88801b8d3480, ffff88801b8d34c0) The buggy address belongs to the physical page: page:ffffea00006e34c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1b8d3 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea00006e2180 dead000000000003 ffff888011841640 raw: 0000000000000000 0000000000200020 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 0x112c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL), pid 2969, tgid 2969 (udevd), ts 311799273362, free_ts 311759882877 prep_new_page mm/page_alloc.c:2535 [inline] get_page_from_freelist+0x210d/0x3a30 mm/page_alloc.c:4282 __alloc_pages+0x1c7/0x510 mm/page_alloc.c:5506 alloc_pages+0x1aa/0x310 mm/mempolicy.c:2280 alloc_slab_page mm/slub.c:1824 [inline] allocate_slab+0x27e/0x3d0 mm/slub.c:1969 new_slab mm/slub.c:2029 [inline] ___slab_alloc+0x89d/0xef0 mm/slub.c:3031 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3118 slab_alloc_node mm/slub.c:3209 [inline] slab_alloc mm/slub.c:3251 [inline] __kmalloc+0x3a2/0x450 mm/slub.c:4420 kmalloc include/linux/slab.h:605 [inline] kzalloc include/linux/slab.h:733 [inline] tomoyo_encode2.part.0+0xe9/0x3a0 security/tomoyo/realpath.c:45 tomoyo_encode2 security/tomoyo/realpath.c:31 [inline] tomoyo_encode+0x28/0x50 security/tomoyo/realpath.c:80 tomoyo_realpath_from_path+0x186/0x620 security/tomoyo/realpath.c:288 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_check_open_permission+0x272/0x380 security/tomoyo/file.c:771 tomoyo_file_open security/tomoyo/tomoyo.c:320 [inline] tomoyo_file_open+0x9d/0xc0 security/tomoyo/tomoyo.c:315 security_file_open+0x45/0xb0 security/security.c:1646 do_dentry_open+0x349/0x11f0 fs/open.c:865 do_open fs/namei.c:3520 [inline] path_openat+0x1c71/0x2930 fs/namei.c:3653 do_filp_open+0x1aa/0x400 fs/namei.c:3680 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1453 [inline] free_pcp_prepare+0x5e4/0xd20 mm/page_alloc.c:1503 free_unref_page_prepare mm/page_alloc.c:3383 [inline] free_unref_page+0x19/0x4d0 mm/page_alloc.c:3479 __vunmap+0x85d/0xd30 mm/vmalloc.c:2696 __vfree+0x3c/0xd0 mm/vmalloc.c:2744 vfree+0x5a/0x90 mm/vmalloc.c:2775 copy_entries_to_user net/ipv4/netfilter/ip_tables.c:868 [inline] get_entries net/ipv4/netfilter/ip_tables.c:1024 [inline] do_ipt_get_ctl+0x7fe/0x9d0 net/ipv4/netfilter/ip_tables.c:1663 nf_getsockopt+0x72/0xd0 net/netfilter/nf_sockopt.c:116 ip_getsockopt net/ipv4/ip_sockglue.c:1786 [inline] ip_getsockopt+0x164/0x1c0 net/ipv4/ip_sockglue.c:1765 tcp_getsockopt+0x86/0xd0 net/ipv4/tcp.c:4338 __sys_getsockopt+0x216/0x690 net/socket.c:2295 __do_sys_getsockopt net/socket.c:2310 [inline] __se_sys_getsockopt net/socket.c:2307 [inline] __x64_sys_getsockopt+0xba/0x150 net/socket.c:2307 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 Memory state around the buggy address: ffff88801b8d3380: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88801b8d3400: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff88801b8d3480: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff88801b8d3500: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88801b8d3580: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ==================================================================