overlayfs: "xino" feature enabled using 3 upper inode bits. ================================================================== BUG: KASAN: slab-use-after-free in __d_alloc_parallel+0x8c8/0x1660 fs/dcache.c:2816 Read of size 4 at addr ffff888117f3c058 by task syz.0.17/5862 CPU: 0 UID: 0 PID: 5862 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description+0x55/0x1e0 mm/kasan/report.c:378 print_report+0x58/0x70 mm/kasan/report.c:482 kasan_report+0x117/0x150 mm/kasan/report.c:595 __d_alloc_parallel+0x8c8/0x1660 fs/dcache.c:2816 ovl_cache_update+0x2c4/0xc30 fs/overlayfs/readdir.c:577 ovl_iterate_merged fs/overlayfs/readdir.c:882 [inline] ovl_iterate+0x686/0x21a0 fs/overlayfs/readdir.c:930 wrap_directory_iterator+0x96/0xe0 fs/readdir.c:67 iterate_dir+0x399/0x570 fs/readdir.c:110 __do_sys_getdents64 fs/readdir.c:399 [inline] __se_sys_getdents64+0xf1/0x280 fs/readdir.c:384 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fb245d9cdd9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fb246d39028 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9 RAX: ffffffffffffffda RBX: 00007fb246015fa0 RCX: 00007fb245d9cdd9 RDX: 0000000000001000 RSI: 0000200000000400 RDI: 0000000000000003 RBP: 00007fb245e32d69 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fb246016038 R14: 00007fb246015fa0 R15: 00007ffe42640d08 Allocated by task 5860: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 unpoison_slab_object mm/kasan/common.c:340 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4569 [inline] slab_alloc_node mm/slub.c:4898 [inline] kmem_cache_alloc_lru_noprof+0x2b8/0x640 mm/slub.c:4917 __d_alloc+0x37/0x6f0 fs/dcache.c:1808 __d_alloc_parallel+0xe3/0x1660 fs/dcache.c:2758 ovl_cache_update+0x2c4/0xc30 fs/overlayfs/readdir.c:577 ovl_iterate_merged fs/overlayfs/readdir.c:882 [inline] ovl_iterate+0x686/0x21a0 fs/overlayfs/readdir.c:930 wrap_directory_iterator+0x96/0xe0 fs/readdir.c:67 iterate_dir+0x399/0x570 fs/readdir.c:110 __do_sys_getdents64 fs/readdir.c:399 [inline] __se_sys_getdents64+0xf1/0x280 fs/readdir.c:384 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 5731: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2689 [inline] slab_free mm/slub.c:6246 [inline] kmem_cache_free+0x182/0x650 mm/slub.c:6373 rcu_do_batch kernel/rcu/tree.c:2617 [inline] rcu_core+0x7cd/0x1070 kernel/rcu/tree.c:2869 handle_softirqs+0x22a/0x840 kernel/softirq.c:622 do_softirq+0x76/0xd0 kernel/softirq.c:523 __local_bh_enable_ip+0xf8/0x130 kernel/softirq.c:450 local_bh_enable include/linux/bottom_half.h:33 [inline] __alloc_skb+0x1aa/0x7d0 net/core/skbuff.c:697 alloc_skb include/linux/skbuff.h:1383 [inline] mld_newpack+0x14c/0xc90 net/ipv6/mcast.c:1775 add_grhead+0x5a/0x2a0 net/ipv6/mcast.c:1886 add_grec+0x1452/0x1740 net/ipv6/mcast.c:2025 mld_send_initial_cr+0x288/0x550 net/ipv6/mcast.c:2268 mld_dad_work+0x45/0x5b0 net/ipv6/mcast.c:2294 process_one_work kernel/workqueue.c:3302 [inline] process_scheduled_works+0xb5d/0x1860 kernel/workqueue.c:3385 worker_thread+0xa53/0xfc0 kernel/workqueue.c:3466 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Last potentially related work creation: kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556 __call_rcu_common kernel/rcu/tree.c:3131 [inline] call_rcu+0xee/0x890 kernel/rcu/tree.c:3251 __dentry_kill+0x4a9/0x690 fs/dcache.c:738 finish_dput+0xc9/0x480 fs/dcache.c:928 ovl_cache_update+0x68e/0xc30 fs/overlayfs/readdir.c:643 ovl_iterate_merged fs/overlayfs/readdir.c:882 [inline] ovl_iterate+0x686/0x21a0 fs/overlayfs/readdir.c:930 wrap_directory_iterator+0x96/0xe0 fs/readdir.c:67 iterate_dir+0x399/0x570 fs/readdir.c:110 __do_sys_getdents64 fs/readdir.c:399 [inline] __se_sys_getdents64+0xf1/0x280 fs/readdir.c:384 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888117f3c000 which belongs to the cache dentry of size 312 The buggy address is located 88 bytes inside of freed 312-byte region [ffff888117f3c000, ffff888117f3c138) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x117f3c head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff888117f3ded9 flags: 0x17ff00000000040(head|node=0|zone=2|lastcpupid=0x7ff) page_type: f5(slab) raw: 017ff00000000040 ffff88816041a140 dead000000000100 dead000000000122 raw: 0000000000000000 0000000800150015 00000000f5000000 ffff888117f3ded9 head: 017ff00000000040 ffff88816041a140 dead000000000100 dead000000000122 head: 0000000000000000 0000000800150015 00000000f5000000 ffff888117f3ded9 head: 017ff00000000001 ffffffffffffff81 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000002 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Reclaimable, gfp_mask 0xd20d0(__GFP_RECLAIMABLE|__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5860, tgid 5859 (syz.1.18), ts 82425954221, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x231/0x280 mm/page_alloc.c:1858 prep_new_page mm/page_alloc.c:1866 [inline] get_page_from_freelist+0x24ba/0x2540 mm/page_alloc.c:3946 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5226 alloc_slab_page mm/slub.c:3278 [inline] allocate_slab+0x77/0x660 mm/slub.c:3467 new_slab mm/slub.c:3525 [inline] refill_objects+0x339/0x3d0 mm/slub.c:7251 refill_sheaf mm/slub.c:2816 [inline] __pcs_replace_empty_main+0x321/0x720 mm/slub.c:4651 alloc_from_pcs mm/slub.c:4749 [inline] slab_alloc_node mm/slub.c:4883 [inline] kmem_cache_alloc_lru_noprof+0x37c/0x640 mm/slub.c:4917 __d_alloc+0x37/0x6f0 fs/dcache.c:1808 __d_alloc_parallel+0xe3/0x1660 fs/dcache.c:2758 ovl_cache_update+0x2c4/0xc30 fs/overlayfs/readdir.c:577 ovl_iterate_merged fs/overlayfs/readdir.c:882 [inline] ovl_iterate+0x686/0x21a0 fs/overlayfs/readdir.c:930 wrap_directory_iterator+0x96/0xe0 fs/readdir.c:67 iterate_dir+0x399/0x570 fs/readdir.c:110 __do_sys_getdents64 fs/readdir.c:399 [inline] __se_sys_getdents64+0xf1/0x280 fs/readdir.c:384 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f page_owner free stack trace missing Memory state around the buggy address: ffff888117f3bf00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888117f3bf80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff888117f3c000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888117f3c080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888117f3c100: fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc fa 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