================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x3d73/0x55d0 kernel/locking/lockdep.c:4923 Read of size 8 at addr ffff88806f1fb8a8 by task syz-executor.0/4706 CPU: 0 PID: 4706 Comm: syz-executor.0 Not tainted 5.19.0-rc5-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+0x57/0x7d lib/dump_stack.c:106 print_address_description.constprop.0.cold+0xeb/0x495 mm/kasan/report.c:313 print_report mm/kasan/report.c:429 [inline] kasan_report.cold+0xf4/0x1c6 mm/kasan/report.c:491 __lock_acquire+0x3d73/0x55d0 kernel/locking/lockdep.c:4923 lock_acquire kernel/locking/lockdep.c:5665 [inline] lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5630 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline] _raw_spin_lock_irq+0x32/0x50 kernel/locking/spinlock.c:170 spin_lock_irq include/linux/spinlock.h:374 [inline] post_one_notification.isra.0+0x4f/0x890 kernel/watch_queue.c:86 __post_watch_notification kernel/watch_queue.c:206 [inline] __post_watch_notification+0x419/0x790 kernel/watch_queue.c:176 post_watch_notification include/linux/watch_queue.h:109 [inline] notify_key security/keys/internal.h:199 [inline] __key_update security/keys/key.c:775 [inline] key_create_or_update+0xa84/0xbe0 security/keys/key.c:979 __do_sys_add_key+0x156/0x300 security/keys/keyctl.c:134 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 RIP: 0033:0x7f7330c89109 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:00007f7331ed7168 EFLAGS: 00000246 ORIG_RAX: 00000000000000f8 RAX: ffffffffffffffda RBX: 00007f7330d9bf60 RCX: 00007f7330c89109 RDX: 00000000200000c0 RSI: 0000000020000080 RDI: 0000000020000040 RBP: 00007f7330ce308d R08: fffffffffffffffc R09: 0000000000000000 R10: 0000000000000048 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdd43c240f R14: 00007f7331ed7300 R15: 0000000000022000 Allocated by task 4703: 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] kzalloc include/linux/slab.h:733 [inline] alloc_pipe_info+0xd0/0x480 fs/pipe.c:790 get_pipe_inode fs/pipe.c:881 [inline] create_pipe_files+0x85/0x860 fs/pipe.c:913 __do_pipe_flags fs/pipe.c:962 [inline] do_pipe2+0x78/0x150 fs/pipe.c:1010 __do_sys_pipe2 fs/pipe.c:1028 [inline] __se_sys_pipe2 fs/pipe.c:1026 [inline] __x64_sys_pipe2+0x4b/0x70 fs/pipe.c:1026 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 4704: 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+0x166/0x1a0 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:3536 [inline] kfree+0xd6/0x4d0 mm/slub.c:4584 put_pipe_info fs/pipe.c:711 [inline] pipe_release+0x217/0x270 fs/pipe.c:734 __fput+0x1f5/0x8c0 fs/file_table.c:317 task_work_run+0xc0/0x160 kernel/task_work.c:177 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop kernel/entry/common.c:169 [inline] exit_to_user_mode_prepare+0x23c/0x250 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:294 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x46/0xb0 The buggy address belongs to the object at ffff88806f1fb800 which belongs to the cache kmalloc-cg-512 of size 512 The buggy address is located 168 bytes inside of 512-byte region [ffff88806f1fb800, ffff88806f1fba00) The buggy address belongs to the physical page: page:ffffea0001bc7e00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x6f1f8 head:ffffea0001bc7e00 order:2 compound_mapcount:0 compound_pincount:0 memcg:ffff88807a973e01 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea0001e01a00 dead000000000002 ffff888010c42dc0 raw: 0000000000000000 0000000080100010 00000001ffffffff ffff88807a973e01 page dumped because: kasan: bad access detected 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 3880, tgid 3880 (dhcpcd-run-hook), ts 49083586275, free_ts 33327313764 prep_new_page mm/page_alloc.c:2456 [inline] get_page_from_freelist+0x19d3/0x3b30 mm/page_alloc.c:4198 __alloc_pages+0x1c7/0x510 mm/page_alloc.c:5426 alloc_slab_page mm/slub.c:1824 [inline] allocate_slab+0x26c/0x3c0 mm/slub.c:1969 new_slab mm/slub.c:2029 [inline] ___slab_alloc+0x9bc/0xe10 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] kmem_cache_alloc_trace+0x310/0x3f0 mm/slub.c:3282 kmalloc include/linux/slab.h:600 [inline] kzalloc include/linux/slab.h:733 [inline] alloc_pipe_info+0xd0/0x480 fs/pipe.c:790 get_pipe_inode fs/pipe.c:881 [inline] create_pipe_files+0x85/0x860 fs/pipe.c:913 __do_pipe_flags fs/pipe.c:962 [inline] do_pipe2+0x78/0x150 fs/pipe.c:1010 __do_sys_pipe fs/pipe.c:1033 [inline] __se_sys_pipe fs/pipe.c:1031 [inline] __x64_sys_pipe+0x2a/0x40 fs/pipe.c:1031 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 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1371 [inline] free_pcp_prepare+0x549/0xd20 mm/page_alloc.c:1421 free_unref_page_prepare mm/page_alloc.c:3343 [inline] free_unref_page+0x19/0x6a0 mm/page_alloc.c:3438 release_pages+0x76b/0x1780 mm/swap.c:946 tlb_batch_pages_flush+0x85/0x160 mm/mmu_gather.c:58 tlb_flush_mmu_free mm/mmu_gather.c:255 [inline] tlb_flush_mmu mm/mmu_gather.c:262 [inline] tlb_finish_mmu+0x110/0x6c0 mm/mmu_gather.c:353 exit_mmap+0x19d/0x3f0 mm/mmap.c:3164 __mmput+0xed/0x430 kernel/fork.c:1187 exit_mm kernel/exit.c:510 [inline] do_exit+0x8e9/0x2470 kernel/exit.c:782 do_group_exit+0xb2/0x2a0 kernel/exit.c:925 get_signal+0x1c76/0x2030 kernel/signal.c:2857 arch_do_signal_or_restart+0x82/0x2300 arch/x86/kernel/signal.c:869 exit_to_user_mode_loop kernel/entry/common.c:166 [inline] exit_to_user_mode_prepare+0x15f/0x250 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:294 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x46/0xb0 Memory state around the buggy address: ffff88806f1fb780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88806f1fb800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88806f1fb880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88806f1fb900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88806f1fb980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================