loop0: detected capacity change from 0 to 512 ntfs: (device loop0): is_boot_sector_ntfs(): Invalid end of sector marker. ================================================================== BUG: KASAN: use-after-free in ntfs_attr_find+0xce9/0xd80 fs/ntfs/attrib.c:597 Read of size 2 at addr ffff8880771c8008 by task syz-executor.0/7084 CPU: 0 PID: 7084 Comm: syz-executor.0 Not tainted 6.0.0-rc6-syzkaller-00009-g60891ec99e14 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1b1/0x28e lib/dump_stack.c:106 print_address_description+0x65/0x4b0 mm/kasan/report.c:317 print_report+0x108/0x1f0 mm/kasan/report.c:433 kasan_report+0xc3/0xf0 mm/kasan/report.c:495 ntfs_attr_find+0xce9/0xd80 fs/ntfs/attrib.c:597 ntfs_attr_lookup+0x4c3/0x2370 ntfs_read_inode_mount+0x8c9/0x2680 fs/ntfs/inode.c:1845 ntfs_fill_super+0x187a/0x2bf0 fs/ntfs/super.c:2854 mount_bdev+0x26c/0x3a0 fs/super.c:1400 legacy_get_tree+0xea/0x180 fs/fs_context.c:610 vfs_get_tree+0x88/0x270 fs/super.c:1530 do_new_mount+0x289/0xad0 fs/namespace.c:3040 do_mount fs/namespace.c:3383 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount+0x2d3/0x3c0 fs/namespace.c:3568 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7ff3a6c8a93a Code: 48 c7 c2 b8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 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:00007ff3a7debf88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 00007ff3a6c8a93a RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ff3a7debfe0 RBP: 00007ff3a7dec020 R08: 00007ff3a7dec020 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000000 R13: 0000000020000100 R14: 00007ff3a7debfe0 R15: 0000000020079ca0 Allocated by task 0: (stack is not available) The buggy address belongs to the object at ffff8880771c8000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 8 bytes inside of 1024-byte region [ffff8880771c8000, ffff8880771c8400) The buggy address belongs to the physical page: page:ffffea0001dc7200 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880771cf000 pfn:0x771c8 head:ffffea0001dc7200 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea0001dedc08 ffffea0001cff208 ffff888012041dc0 raw: ffff8880771cf000 0000000000100006 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 3588, tgid 3588 (sshd), ts 57499995198, free_ts 57479641850 prep_new_page mm/page_alloc.c:2532 [inline] get_page_from_freelist+0x742/0x7c0 mm/page_alloc.c:4283 __alloc_pages+0x259/0x560 mm/page_alloc.c:5515 alloc_slab_page+0x70/0xf0 mm/slub.c:1824 allocate_slab+0x5e/0x520 mm/slub.c:1969 new_slab mm/slub.c:2029 [inline] ___slab_alloc+0x3ee/0xc40 mm/slub.c:3031 __slab_alloc mm/slub.c:3118 [inline] slab_alloc_node mm/slub.c:3209 [inline] __kmalloc_node_track_caller+0x2bd/0x3f0 mm/slub.c:4955 kmalloc_reserve net/core/skbuff.c:362 [inline] __alloc_skb+0x112/0x2b0 net/core/skbuff.c:434 alloc_skb_fclone include/linux/skbuff.h:1307 [inline] tcp_stream_alloc_skb+0x3c/0x300 net/ipv4/tcp.c:861 tcp_sendmsg_locked+0xd70/0x40c0 net/ipv4/tcp.c:1325 tcp_sendmsg+0x2c/0x40 net/ipv4/tcp.c:1483 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg net/socket.c:734 [inline] sock_write_iter+0x3d4/0x540 net/socket.c:1108 call_write_iter include/linux/fs.h:2187 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x7dc/0xc50 fs/read_write.c:578 ksys_write+0x177/0x2a0 fs/read_write.c:631 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1449 [inline] free_pcp_prepare+0x812/0x900 mm/page_alloc.c:1499 free_unref_page_prepare mm/page_alloc.c:3380 [inline] free_unref_page+0x7d/0x5f0 mm/page_alloc.c:3476 free_slab mm/slub.c:2068 [inline] discard_slab mm/slub.c:2074 [inline] __unfreeze_partials+0x1ab/0x200 mm/slub.c:2548 put_cpu_partial+0x106/0x170 mm/slub.c:2624 qlist_free_all+0x2b/0x70 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x169/0x180 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x2f/0xd0 mm/kasan/common.c:447 kasan_slab_alloc include/linux/kasan.h:224 [inline] slab_post_alloc_hook mm/slab.h:727 [inline] slab_alloc_node mm/slub.c:3243 [inline] slab_alloc mm/slub.c:3251 [inline] __kmem_cache_alloc_lru mm/slub.c:3258 [inline] kmem_cache_alloc+0x1a6/0x310 mm/slub.c:3268 kmem_cache_zalloc include/linux/slab.h:723 [inline] alloc_buffer_head+0x20/0xf0 fs/buffer.c:2974 alloc_page_buffers+0x179/0x460 fs/buffer.c:829 create_empty_buffers+0x36/0xe30 fs/buffer.c:1558 ext4_block_write_begin+0x2e5/0x2290 fs/ext4/inode.c:1074 ext4_da_write_begin+0x539/0x760 fs/ext4/inode.c:2996 generic_perform_write+0x2a8/0x5b0 mm/filemap.c:3738 ext4_buffered_write_iter+0x122/0x3a0 fs/ext4/file.c:270 ext4_file_write_iter+0xabb/0x1ad0 Memory state around the buggy address: ffff8880771c7f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880771c7f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880771c8000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880771c8080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880771c8100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================