KASAN: use-after-free Read in ntfs_lookup_inode_by_name

Status: upstream: reported C repro on 2023/04/12 03:50
Bug presence: origin:lts-only
Labels: missing-backport
[Documentation on labels]
Reported-by: syzbot+189e02963bc7402eecce@syzkaller.appspotmail.com
First crash: 1210d, last: 4d02h
Fix commit to backport (bisect log) :
tree: upstream
commit 7ffa8f3d30236e0ab897c30bdb01224ff1fe1c89
Author: Matthew Wilcox (Oracle) <willy@infradead.org>
Date: Mon Jan 15 07:20:25 2024 +0000

  fs: Remove NTFS classic

  
Fix bisection: failed (error log, bisect log)
  
▶ ▼ Bug presence (2)
Date Name Commit Repro Result
2024/10/07 linux-5.15.y (ToT) 3a5928702e71 C [report] kernel BUG in clear_inode
2024/10/07 upstream (ToT) 87d6aab2389e C Didn't crash
▶ ▼ Similar bugs (3)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 KASAN: use-after-free Read in ntfs_lookup_inode_by_name origin:upstream missing-backport 19 syz, C done 6 611d 1178d 0/3 upstream: reported C repro on 2023/05/14 03:12
upstream KASAN: use-after-free Read in ntfs_lookup_inode_by_name ntfs3 19 syz, C error done 17 877d 1313d 25/29 fixed on 2024/03/20 11:33
linux-4.19 KASAN: use-after-free Read in ntfs_lookup_inode_by_name ntfs 19 syz, C error 1 1305d 1305d 0/1 upstream: reported C repro on 2023/01/07 03:24
▶ ▼ Last patch testing requests (10)
Created Duration User Patch Repo Result
2026/07/31 14:40 15m retest repro linux-5.15.y report log
2026/07/07 17:48 16m retest repro linux-5.15.y report log
2026/07/07 17:48 17m retest repro linux-5.15.y report log
2026/06/19 18:20 20m retest repro linux-5.15.y report log
2026/06/19 18:20 16m retest repro linux-5.15.y report log
2026/05/07 11:26 15m retest repro linux-5.15.y report log
2026/04/22 05:19 14m retest repro linux-5.15.y report log
2026/04/22 05:19 14m retest repro linux-5.15.y report log
2026/03/31 17:48 17m retest repro linux-5.15.y report log
2026/03/31 17:48 11m retest repro linux-5.15.y report log
▶ ▼ Fix bisection attempts (6)
Created Duration User Patch Repo Result
2025/05/11 07:13 6h43m fix candidate upstream OK (1) job log
2024/10/15 04:56 0m fix candidate upstream error job log
2024/07/18 21:46 0m fix candidate upstream error job log
2024/06/14 13:50 8m fix candidate upstream error job log
2023/10/01 16:46 0m bisect fix linux-5.15.y error job log
2023/07/20 02:46 4h18m bisect fix linux-5.15.y OK (0) job log log

Sample crash report:
loop0: detected capacity change from 0 to 4096
ntfs: volume version 3.1.
==================================================================
BUG: KASAN: use-after-free in sle64_to_cpup fs/ntfs/endian.h:46 [inline]
BUG: KASAN: use-after-free in ntfs_lookup_inode_by_name+0xe8d/0x3200 fs/ntfs/dir.c:292
Read of size 8 at addr ffff88807224755a by task syz-executor365/3499

CPU: 0 PID: 3499 Comm: syz-executor365 Not tainted 5.15.115-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 print_address_description+0x63/0x3b0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:434 [inline]
 kasan_report+0x16b/0x1c0 mm/kasan/report.c:451
 sle64_to_cpup fs/ntfs/endian.h:46 [inline]
 ntfs_lookup_inode_by_name+0xe8d/0x3200 fs/ntfs/dir.c:292
 check_windows_hibernation_status+0xfc/0x6f0 fs/ntfs/super.c:1274
 load_system_files+0x4041/0x5700 fs/ntfs/super.c:1989
 ntfs_fill_super+0x1c7f/0x2e20 fs/ntfs/super.c:2894
 mount_bdev+0x2c9/0x3f0 fs/super.c:1378
 legacy_get_tree+0xeb/0x180 fs/fs_context.c:610
 vfs_get_tree+0x88/0x270 fs/super.c:1508
 do_new_mount+0x28b/0xae0 fs/namespace.c:2994
 do_mount fs/namespace.c:3337 [inline]
 __do_sys_mount fs/namespace.c:3545 [inline]
 __se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3522
 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+0x61/0xcb
RIP: 0033:0x7f8372a7bb0a
Code: 48 c7 c2 b8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 08 01 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:00007fff42a74d98 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f8372a7bb0a
RDX: 000000002001ec80 RSI: 000000002001ecc0 RDI: 00007fff42a74db0
RBP: 00007fff42a74db0 R08: 00007fff42a74df0 R09: 000000000001ec63
R10: 0000000000000000 R11: 0000000000000286 R12: 0000000000000004
R13: 0000555556e422b8 R14: 0000000000000000 R15: 00007fff42a74df0
 </TASK>

The buggy address belongs to the page:
page:ffffea0001c891c0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x72247
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 ffffea0001c89208 ffffea0001c89188 0000000000000000
raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Movable, gfp_mask 0x8(__GFP_MOVABLE), pid 1, ts 10249786585, free_ts 11376687921
 split_map_pages+0x246/0x510 mm/compaction.c:99
 isolate_freepages_range+0x47c/0x4e0 mm/compaction.c:749
 alloc_contig_range+0xc2b/0xf90 mm/page_alloc.c:9214
 __alloc_contig_pages mm/page_alloc.c:9238 [inline]
 alloc_contig_pages+0x3ea/0x4e0 mm/page_alloc.c:9318
 debug_vm_pgtable_alloc_huge_page+0xb9/0x108 mm/debug_vm_pgtable.c:1085
 init_args+0xa3e/0xdb5 mm/debug_vm_pgtable.c:1207
 debug_vm_pgtable+0xaa/0x462 mm/debug_vm_pgtable.c:1245
 do_one_initcall+0x22b/0x7a0 init/main.c:1306
 do_initcall_level+0x157/0x207 init/main.c:1379
 do_initcalls+0x49/0x86 init/main.c:1395
 kernel_init_freeable+0x43c/0x5c5 init/main.c:1619
 kernel_init+0x19/0x290 init/main.c:1510
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1340 [inline]
 free_pcp_prepare mm/page_alloc.c:1391 [inline]
 free_unref_page_prepare+0xc34/0xcf0 mm/page_alloc.c:3317
 free_unref_page+0x95/0x2d0 mm/page_alloc.c:3396
 free_contig_range+0x95/0xf0 mm/page_alloc.c:9340
 destroy_args+0xfe/0x97f mm/debug_vm_pgtable.c:1018
 debug_vm_pgtable+0x40d/0x462 mm/debug_vm_pgtable.c:1331
 do_one_initcall+0x22b/0x7a0 init/main.c:1306
 do_initcall_level+0x157/0x207 init/main.c:1379
 do_initcalls+0x49/0x86 init/main.c:1395
 kernel_init_freeable+0x43c/0x5c5 init/main.c:1619
 kernel_init+0x19/0x290 init/main.c:1510
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298

Memory state around the buggy address:
 ffff888072247400: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888072247480: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff888072247500: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                                    ^
 ffff888072247580: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888072247600: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================

Crashes (10):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/06/08 19:50 linux-5.15.y d7af3e5ba454 058b3a5a .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan KASAN: use-after-free Read in ntfs_lookup_inode_by_name
2025/01/08 05:05 linux-5.15.y 91786f140358 f3558dbf .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan-arm64 KASAN: use-after-free Read in ntfs_lookup_inode_by_name
2025/01/08 01:17 linux-5.15.y 91786f140358 f3558dbf .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan-arm64 KASAN: use-after-free Read in ntfs_lookup_inode_by_name
2024/03/06 07:08 linux-5.15.y 80efc6265290 f39a7eed .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan-arm64 KASAN: use-after-free Read in ntfs_lookup_inode_by_name
2023/05/13 00:57 linux-5.15.y b0ece631f84a ecca8a24 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan-arm64 KASAN: use-after-free Read in ntfs_lookup_inode_by_name
2024/03/06 06:51 linux-5.15.y 80efc6265290 f39a7eed .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 KASAN: use-after-free Read in ntfs_lookup_inode_by_name
2023/12/11 05:04 linux-5.15.y 8a1d809b0545 28b24332 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 KASAN: use-after-free Read in ntfs_lookup_inode_by_name
2023/08/04 14:32 linux-5.15.y 38d4ca22a528 74621247 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 KASAN: use-after-free Read in ntfs_lookup_inode_by_name
2023/05/12 17:23 linux-5.15.y b0ece631f84a ecca8a24 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 KASAN: use-after-free Read in ntfs_lookup_inode_by_name
2023/04/12 03:50 linux-5.15.y d86dfc4d95cd 49faf98d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 KASAN: use-after-free Read in ntfs_lookup_inode_by_name
* Struck through repros no longer work on HEAD.