syzbot has found a reproducer for the following issue on: HEAD commit: 92514ef226f5 Merge tag 'for-6.14-rc1-tag' of git://git.ker.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1029adf8580000 kernel config: https://syzkaller.appspot.com/x/.config?x=1909f2f0d8e641ce dashboard link: https://syzkaller.appspot.com/bug?extid=339240205a3fd334f686 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1429adf8580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=169381b0580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-92514ef2.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/c4d8b91f8769/vmlinux-92514ef2.xz kernel image: https://storage.googleapis.com/syzbot-assets/c24ec4365966/bzImage-92514ef2.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/2ad88ddc4451/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+339240205a3fd334f686@xxxxxxxxxxxxxxxxxxxxxxxxx overlayfs: upper fs does not support RENAME_WHITEOUT. ================================================================== BUG: KASAN: out-of-bounds in __wait_on_bit+0xdf/0x2f0 kernel/sched/wait_bit.c:50 Read of size 8 at addr ffffc9000d86d940 by task syz-executor369/5428 CPU: 0 UID: 0 PID: 5428 Comm: syz-executor369 Not tainted 6.14.0-rc1-syzkaller-00034-g92514ef226f5 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x169/0x550 mm/kasan/report.c:489 kasan_report+0x143/0x180 mm/kasan/report.c:602 __wait_on_bit+0xdf/0x2f0 kernel/sched/wait_bit.c:50 out_of_line_wait_on_bit+0x1d5/0x260 kernel/sched/wait_bit.c:64 wait_on_bit_io include/linux/wait_bit.h:105 [inline] __wait_on_buffer fs/buffer.c:123 [inline] wait_on_buffer include/linux/buffer_head.h:414 [inline] __sync_dirty_buffer+0x2f7/0x390 fs/buffer.c:2858 ntfs_write_bh+0x5f7/0x7c0 fs/ntfs3/fsntfs.c:1485 mi_write+0x9b/0x1e0 fs/ntfs3/record.c:402 indx_update_dup+0x69a/0x860 fs/ntfs3/index.c:2697 ni_update_parent+0xa18/0xdd0 fs/ntfs3/frecord.c:3230 ni_write_inode+0xe61/0x1100 fs/ntfs3/frecord.c:3321 write_inode fs/fs-writeback.c:1525 [inline] __writeback_single_inode+0x708/0x10d0 fs/fs-writeback.c:1745 writeback_single_inode+0x1f3/0x660 fs/fs-writeback.c:1801 sync_inode_metadata+0xc4/0x120 fs/fs-writeback.c:2871 __generic_file_fsync+0x134/0x1a0 fs/libfs.c:1536 generic_file_fsync+0x70/0xf0 fs/libfs.c:1566 ovl_sync_file+0x3a/0x50 fs/overlayfs/copy_up.c:254 ovl_copy_up_metadata+0xac1/0xef0 fs/overlayfs/copy_up.c:724 ovl_copy_up_workdir fs/overlayfs/copy_up.c:816 [inline] ovl_do_copy_up fs/overlayfs/copy_up.c:1001 [inline] ovl_copy_up_one fs/overlayfs/copy_up.c:1202 [inline] ovl_copy_up_flags+0x244a/0x47c0 fs/overlayfs/copy_up.c:1257 ovl_open+0x139/0x310 fs/overlayfs/file.c:211 do_dentry_open+0xdec/0x1960 fs/open.c:955 vfs_open+0x3b/0x370 fs/open.c:1085 dentry_open+0x61/0xa0 fs/open.c:1108 ima_calc_file_hash+0x16b/0x1b30 security/integrity/ima/ima_crypto.c:553 ima_collect_measurement+0x520/0xb10 security/integrity/ima/ima_api.c:293 process_measurement+0x1351/0x1fb0 security/integrity/ima/ima_main.c:372 ima_file_check+0xd9/0x120 security/integrity/ima/ima_main.c:600 security_file_post_open+0xb9/0x280 security/security.c:3130 do_open fs/namei.c:3832 [inline] path_openat+0x2cca/0x3590 fs/namei.c:3989 do_filp_open+0x27f/0x4e0 fs/namei.c:4016 do_sys_openat2+0x13e/0x1d0 fs/open.c:1427 do_sys_open fs/open.c:1442 [inline] __do_sys_openat fs/open.c:1458 [inline] __se_sys_openat fs/open.c:1453 [inline] __x64_sys_openat+0x247/0x2a0 fs/open.c:1453 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f0002351fb9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 01 1a 00 00 90 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:00007fffb15b1078 EFLAGS: 00000206 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f0002351fb9 RDX: 0000000000000083 RSI: 0000200000000000 RDI: 00000000ffffff9c RBP: 0031656c69662f2e R08: 00007fffb15b10b0 R09: 00007fffb15b10b0 R10: 0000000000000000 R11: 0000000000000206 R12: 00007fffb15b109c R13: 0000000000000004 R14: 431bde82d7b634db R15: 00007fffb15b10d0 </TASK> The buggy address belongs to stack of task syz-executor369/5428 and is located at offset 32 in frame: out_of_line_wait_on_bit+0x0/0x260 This frame has 1 object: [32, 96) 'wq_entry' The buggy address belongs to the virtual mapping at [ffffc9000d868000, ffffc9000d871000) created by: copy_process+0x5d1/0x3d50 kernel/fork.c:2233 The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888000000000 pfn:0x49fa7 flags: 0x4fff00000000000(node=1|zone=1|lastcpupid=0x7ff) raw: 04fff00000000000 0000000000000000 dead000000000122 0000000000000000 raw: ffff888000000000 0000000000000000 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 0x2dc2(GFP_KERNEL|__GFP_HIGHMEM|__GFP_NOWARN|__GFP_ZERO), pid 5311, tgid 5311 (syz-executor369), ts 75259377764, free_ts 75170649321 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f4/0x240 mm/page_alloc.c:1551 prep_new_page mm/page_alloc.c:1559 [inline] get_page_from_freelist+0x365c/0x37a0 mm/page_alloc.c:3477 __alloc_frozen_pages_noprof+0x292/0x710 mm/page_alloc.c:4739 alloc_pages_mpol+0x311/0x660 mm/mempolicy.c:2270 alloc_frozen_pages_noprof mm/mempolicy.c:2341 [inline] alloc_pages_noprof+0x121/0x190 mm/mempolicy.c:2361 vm_area_alloc_pages mm/vmalloc.c:3591 [inline] __vmalloc_area_node mm/vmalloc.c:3669 [inline] __vmalloc_node_range_noprof+0x9c6/0x1380 mm/vmalloc.c:3846 alloc_thread_stack_node kernel/fork.c:314 [inline] dup_task_struct+0x444/0x8c0 kernel/fork.c:1127 copy_process+0x5d1/0x3d50 kernel/fork.c:2233 kernel_clone+0x226/0x8e0 kernel/fork.c:2815 __do_sys_clone kernel/fork.c:2958 [inline] __se_sys_clone kernel/fork.c:2942 [inline] __x64_sys_clone+0x258/0x2a0 kernel/fork.c:2942 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f page last free pid 5313 tgid 5313 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_frozen_pages+0xe0d/0x10e0 mm/page_alloc.c:2660 pagetable_free include/linux/mm.h:2917 [inline] pagetable_dtor_free include/linux/mm.h:3015 [inline] __tlb_remove_table+0x33c/0x420 include/asm-generic/tlb.h:216 __tlb_remove_table_free mm/mmu_gather.c:227 [inline] tlb_remove_table_rcu+0x76/0xf0 mm/mmu_gather.c:282 rcu_do_batch kernel/rcu/tree.c:2546 [inline] rcu_core+0xaaa/0x17a0 kernel/rcu/tree.c:2802 handle_softirqs+0x2d4/0x9b0 kernel/softirq.c:561 do_softirq+0x11b/0x1e0 kernel/softirq.c:462 __local_bh_enable_ip+0x1bb/0x200 kernel/softirq.c:389 spin_unlock_bh include/linux/spinlock.h:396 [inline] wg_packet_send_staged_packets+0x313/0x18c0 drivers/net/wireguard/send.c:352 wg_open+0x2a3/0x420 drivers/net/wireguard/device.c:55 __dev_open+0x2d3/0x4a0 net/core/dev.c:1604 __dev_change_flags+0x1e2/0x6f0 net/core/dev.c:9172 dev_change_flags+0x8b/0x1a0 net/core/dev.c:9244 do_setlink+0xc90/0x4210 net/core/rtnetlink.c:3118 rtnl_changelink net/core/rtnetlink.c:3732 [inline] __rtnl_newlink net/core/rtnetlink.c:3884 [inline] rtnl_newlink+0x1bb6/0x2210 net/core/rtnetlink.c:4021 rtnetlink_rcv_msg+0x791/0xcf0 net/core/rtnetlink.c:6911 netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2543 Memory state around the buggy address: ffffc9000d86d800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffc9000d86d880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffffc9000d86d900: 00 00 00 00 f1 f1 f1 f1 00 00 00 00 00 00 00 00 ^ ffffc9000d86d980: f3 f3 f3 f3 00 00 00 00 00 00 00 00 00 00 00 00 ffffc9000d86da00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing.
