================================================================== BUG: KASAN: use-after-free in __wake_up_common+0x637/0x650 kernel/sched/wait.c:101 Read of size 8 at addr ffff88807e940db0 by task syz-executor202/4099 CPU: 0 PID: 4099 Comm: syz-executor202 Not tainted 5.17.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x57/0x7d lib/dump_stack.c:106 print_address_description.constprop.0.cold+0x8d/0x336 mm/kasan/report.c:255 __kasan_report mm/kasan/report.c:442 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:459 __wake_up_common+0x637/0x650 kernel/sched/wait.c:101 __wake_up_common_lock+0xd0/0x130 kernel/sched/wait.c:138 tty_release+0x504/0xf80 drivers/tty/tty_io.c:1781 __fput+0x204/0x8d0 fs/file_table.c:317 task_work_run+0xc0/0x160 kernel/task_work.c:164 exit_task_work include/linux/task_work.h:32 [inline] do_exit+0x9ab/0x2500 kernel/exit.c:806 do_group_exit+0xb2/0x2a0 kernel/exit.c:935 __do_sys_exit_group kernel/exit.c:946 [inline] __se_sys_exit_group kernel/exit.c:944 [inline] __x64_sys_exit_group+0x35/0x40 kernel/exit.c:944 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+0x44/0xae RIP: 0033:0x7f6689f25c59 Code: Unable to access opcode bytes at RIP 0x7f6689f25c2f. RSP: 002b:00007ffcf4776288 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00007f6689f9a330 RCX: 00007f6689f25c59 RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffffffffffffffc0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f6689f9a330 R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001 Allocated by task 4098: 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:581 [inline] io_arm_poll_handler+0x30e/0x880 fs/io_uring.c:6209 io_queue_sqe_arm_apoll+0x52/0x350 fs/io_uring.c:7459 __io_queue_sqe fs/io_uring.c:7501 [inline] io_queue_sqe fs/io_uring.c:7528 [inline] io_submit_sqe fs/io_uring.c:7736 [inline] io_submit_sqes+0x632e/0x80c0 fs/io_uring.c:7842 __do_sys_io_uring_enter+0x6d3/0x1030 fs/io_uring.c:10873 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+0x44/0xae Freed by task 4098: 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+0x126/0x160 mm/kasan/common.c:328 kasan_slab_free include/linux/kasan.h:236 [inline] slab_free_hook mm/slub.c:1728 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1754 slab_free mm/slub.c:3509 [inline] kfree+0xd0/0x390 mm/slub.c:4562 io_clean_op+0x198/0xbc0 fs/io_uring.c:7097 io_dismantle_req fs/io_uring.c:2245 [inline] __io_req_complete_post+0x77d/0xaf0 fs/io_uring.c:2083 io_req_complete_post+0x53/0x1f0 fs/io_uring.c:2096 handle_tw_list fs/io_uring.c:2455 [inline] tctx_task_work+0x50f/0xf10 fs/io_uring.c:2489 task_work_run+0xc0/0x160 kernel/task_work.c:164 exit_task_work include/linux/task_work.h:32 [inline] do_exit+0x9ab/0x2500 kernel/exit.c:806 do_group_exit+0xb2/0x2a0 kernel/exit.c:935 __do_sys_exit_group kernel/exit.c:946 [inline] __se_sys_exit_group kernel/exit.c:944 [inline] __x64_sys_exit_group+0x35/0x40 kernel/exit.c:944 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+0x44/0xae The buggy address belongs to the object at ffff88807e940d80 which belongs to the cache kmalloc-96 of size 96 The buggy address is located 48 bytes inside of 96-byte region [ffff88807e940d80, ffff88807e940de0) The buggy address belongs to the page: page:ffffea0001fa5000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7e940 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 dead000000000100 dead000000000122 ffff88800fc41780 raw: 0000000000000000 0000000080200020 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 0x12c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY), pid 2950, ts 10696564408, free_ts 10534418381 prep_new_page mm/page_alloc.c:2434 [inline] get_page_from_freelist+0xa6f/0x2f10 mm/page_alloc.c:4165 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5389 alloc_slab_page mm/slub.c:1799 [inline] allocate_slab+0x27f/0x3c0 mm/slub.c:1944 new_slab mm/slub.c:2004 [inline] ___slab_alloc+0xbe3/0x12a0 mm/slub.c:3018 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3105 slab_alloc_node mm/slub.c:3196 [inline] slab_alloc mm/slub.c:3238 [inline] __kmalloc+0x372/0x450 mm/slub.c:4420 kmalloc include/linux/slab.h:586 [inline] kzalloc include/linux/slab.h:714 [inline] tomoyo_commit_ok+0x18/0x60 security/tomoyo/memory.c:76 tomoyo_update_domain+0x50c/0x7b0 security/tomoyo/domain.c:139 tomoyo_update_path_number_acl security/tomoyo/file.c:691 [inline] tomoyo_write_file+0x513/0x690 security/tomoyo/file.c:1034 tomoyo_write_domain2+0xe8/0x180 security/tomoyo/common.c:1152 tomoyo_add_entry security/tomoyo/common.c:2042 [inline] tomoyo_supervisor+0x46f/0xef0 security/tomoyo/common.c:2103 tomoyo_audit_path_number_log security/tomoyo/file.c:235 [inline] tomoyo_path_number_perm+0x37d/0x4e0 security/tomoyo/file.c:734 security_file_ioctl+0x44/0x80 security/security.c:1544 __do_sys_ioctl fs/ioctl.c:868 [inline] __se_sys_ioctl fs/ioctl.c:860 [inline] __x64_sys_ioctl+0x99/0x190 fs/ioctl.c:860 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+0x44/0xae page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1352 [inline] free_pcp_prepare+0x374/0x870 mm/page_alloc.c:1404 free_unref_page_prepare mm/page_alloc.c:3325 [inline] free_unref_page_list+0x1a9/0xfa0 mm/page_alloc.c:3441 release_pages+0x223/0xee0 mm/swap.c:980 tlb_batch_pages_flush mm/mmu_gather.c:50 [inline] tlb_flush_mmu_free mm/mmu_gather.c:243 [inline] tlb_flush_mmu mm/mmu_gather.c:250 [inline] tlb_finish_mmu+0x127/0x790 mm/mmu_gather.c:341 exit_mmap+0x1d1/0x5b0 mm/mmap.c:3180 __mmput+0xed/0x430 kernel/fork.c:1114 exit_mm kernel/exit.c:507 [inline] do_exit+0x90e/0x2500 kernel/exit.c:793 do_group_exit+0xb2/0x2a0 kernel/exit.c:935 __do_sys_exit_group kernel/exit.c:946 [inline] __se_sys_exit_group kernel/exit.c:944 [inline] __x64_sys_exit_group+0x35/0x40 kernel/exit.c:944 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+0x44/0xae Memory state around the buggy address: ffff88807e940c80: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc ffff88807e940d00: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc >ffff88807e940d80: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ^ ffff88807e940e00: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc ffff88807e940e80: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ==================================================================