================================================================== BUG: KASAN: use-after-free in ntfs_attr_find+0x91a/0xd80 fs/ntfs/attrib.c:597 Read of size 2 at addr ffff888047cbec8a by task syz-executor.4/15743 CPU: 1 PID: 15743 Comm: syz-executor.4 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+0x91a/0xd80 fs/ntfs/attrib.c:597 ntfs_attr_lookup+0x4c3/0x2370 ntfs_read_locked_inode+0xa26/0x47c0 fs/ntfs/inode.c:666 ntfs_iget+0x10f/0x190 fs/ntfs/inode.c:177 load_system_files+0x2544/0x47e0 fs/ntfs/super.c:1847 ntfs_fill_super+0x19a9/0x2bf0 fs/ntfs/super.c:2891 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: 0033:0x7fe8e2c8a93a 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:00007fe8e3d77f88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 00007fe8e2c8a93a RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007fe8e3d77fe0 RBP: 00007fe8e3d78020 R08: 00007fe8e3d78020 R09: 0000000020000000 R10: 0000000002200091 R11: 0000000000000202 R12: 0000000020000000 R13: 0000000020000100 R14: 00007fe8e3d77fe0 R15: 0000000020079ca0 Allocated by task 6310: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:437 [inline] ____kasan_kmalloc+0xcd/0x100 mm/kasan/common.c:516 kasan_kmalloc include/linux/kasan.h:234 [inline] __kmalloc+0x226/0x370 mm/slub.c:4424 kmalloc include/linux/slab.h:605 [inline] tomoyo_realpath_from_path+0xd8/0x5f0 security/tomoyo/realpath.c:254 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_perm+0x227/0x670 security/tomoyo/file.c:822 security_inode_getattr+0xc0/0x140 security/security.c:1345 vfs_getattr fs/stat.c:157 [inline] vfs_statx+0x168/0x3d0 fs/stat.c:232 vfs_fstatat fs/stat.c:255 [inline] __do_sys_newfstatat fs/stat.c:425 [inline] __se_sys_newfstatat+0xdc/0x7c0 fs/stat.c:419 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 Freed by task 6310: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x3d/0x60 mm/kasan/common.c:45 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0xd8/0x120 mm/kasan/common.c:367 kasan_slab_free include/linux/kasan.h:200 [inline] slab_free_hook mm/slub.c:1754 [inline] slab_free_freelist_hook+0x12e/0x1a0 mm/slub.c:1780 slab_free mm/slub.c:3534 [inline] kfree+0xda/0x210 mm/slub.c:4562 tomoyo_realpath_from_path+0x5bf/0x5f0 security/tomoyo/realpath.c:291 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_perm+0x227/0x670 security/tomoyo/file.c:822 security_inode_getattr+0xc0/0x140 security/security.c:1345 vfs_getattr fs/stat.c:157 [inline] vfs_statx+0x168/0x3d0 fs/stat.c:232 vfs_fstatat fs/stat.c:255 [inline] __do_sys_newfstatat fs/stat.c:425 [inline] __se_sys_newfstatat+0xdc/0x7c0 fs/stat.c:419 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 The buggy address belongs to the object at ffff888047cbe000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 3210 bytes inside of 4096-byte region [ffff888047cbe000, ffff888047cbf000) The buggy address belongs to the physical page: page:ffffea00011f2e00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x47cb8 head:ffffea00011f2e00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888012042140 raw: 0000000000000000 0000000000040004 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 0x1d2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 3825, tgid 3825 (udevd), ts 140446581081, free_ts 140420038535 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] slab_alloc mm/slub.c:3251 [inline] __kmalloc+0x2bd/0x370 mm/slub.c:4420 kmalloc include/linux/slab.h:605 [inline] tomoyo_realpath_from_path+0xd8/0x5f0 security/tomoyo/realpath.c:254 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_check_open_permission+0x1f0/0x460 security/tomoyo/file.c:771 security_file_open+0x50/0x560 security/security.c:1646 do_dentry_open+0x34c/0x1180 fs/open.c:867 do_open fs/namei.c:3557 [inline] path_openat+0x25fc/0x2df0 fs/namei.c:3691 do_filp_open+0x264/0x4f0 fs/namei.c:3718 do_sys_openat2+0x124/0x4e0 fs/open.c:1313 do_sys_open fs/open.c:1329 [inline] __do_sys_openat fs/open.c:1345 [inline] __se_sys_openat fs/open.c:1340 [inline] __x64_sys_openat+0x243/0x290 fs/open.c:1340 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 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] __kmalloc_node+0x1f9/0x420 mm/slub.c:4468 kmalloc_node include/linux/slab.h:623 [inline] kvmalloc_node+0x6e/0x160 mm/util.c:613 kvmalloc include/linux/slab.h:750 [inline] seq_buf_alloc fs/seq_file.c:38 [inline] seq_read_iter+0x1f6/0xd30 fs/seq_file.c:210 call_read_iter include/linux/fs.h:2181 [inline] new_sync_read fs/read_write.c:389 [inline] vfs_read+0x7ac/0xbf0 fs/read_write.c:470 ksys_read+0x177/0x2a0 fs/read_write.c:607 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 Memory state around the buggy address: ffff888047cbeb80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888047cbec00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888047cbec80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888047cbed00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888047cbed80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================