syzbot


KASAN: use-after-free Read in ntfs_lookup_inode_by_name

Status: upstream: reported C repro on 2023/01/07 03:24
Subsystems: ntfs
[Documentation on labels]
Reported-by: syzbot+67f827314d821a8dad9a@syzkaller.appspotmail.com
First crash: 504d, last: 504d
Fix bisection: failed (error log, bisect log)
  
Similar bugs (3)
Kernel Title 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 C done 4 30d 377d 0/3 upstream: reported C repro on 2023/05/14 03:12
linux-5.15 KASAN: use-after-free Read in ntfs_lookup_inode_by_name origin:upstream missing-backport C error 8 53d 409d 0/3 upstream: reported C repro on 2023/04/12 03:50
upstream KASAN: use-after-free Read in ntfs_lookup_inode_by_name ntfs3 C error done 17 76d 512d 26/26 fixed on 2024/03/20 11:33

Sample crash report:
ntfs: (device loop0): load_system_files(): $MFTMirr does not match $MFT.  Mounting read-only.  Run ntfsfix and/or chkdsk.
ntfs: volume version 3.1.
==================================================================
BUG: KASAN: use-after-free in sle64_to_cpup fs/ntfs/endian.h:60 [inline]
BUG: KASAN: use-after-free in ntfs_lookup_inode_by_name+0x36c0/0x3bd0 fs/ntfs/dir.c:305
Read of size 8 at addr ffff88808bb47b80 by task syz-executor549/8104

CPU: 0 PID: 8104 Comm: syz-executor549 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256
 kasan_report_error.cold+0x8a/0x1b9 mm/kasan/report.c:354
 kasan_report mm/kasan/report.c:412 [inline]
 __asan_report_load8_noabort+0x88/0x90 mm/kasan/report.c:433
 sle64_to_cpup fs/ntfs/endian.h:60 [inline]
 ntfs_lookup_inode_by_name+0x36c0/0x3bd0 fs/ntfs/dir.c:305
 check_windows_hibernation_status+0xd9/0xb10 fs/ntfs/super.c:1288
 load_system_files fs/ntfs/super.c:2003 [inline]
 ntfs_fill_super+0x58be/0x7e10 fs/ntfs/super.c:2908
 mount_bdev+0x2fc/0x3b0 fs/super.c:1158
 mount_fs+0xa3/0x310 fs/super.c:1261
 vfs_kern_mount.part.0+0x68/0x470 fs/namespace.c:961
 vfs_kern_mount fs/namespace.c:951 [inline]
 do_new_mount fs/namespace.c:2492 [inline]
 do_mount+0x115c/0x2f50 fs/namespace.c:2822
 ksys_mount+0xcf/0x130 fs/namespace.c:3038
 __do_sys_mount fs/namespace.c:3052 [inline]
 __se_sys_mount fs/namespace.c:3049 [inline]
 __x64_sys_mount+0xba/0x150 fs/namespace.c:3049
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f9bd63bed2a
Code: 48 c7 c2 c0 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 a8 00 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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffca25ef3f8 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 000055555651b2c0 RCX: 00007f9bd63bed2a
RDX: 0000000020000000 RSI: 000000002001ee80 RDI: 00007ffca25ef440
RBP: 0000000000000000 R08: 00007ffca25ef480 R09: 0000000000000000
R10: 0000000000004010 R11: 0000000000000286 R12: 0000000000000004
R13: 00007ffca25ef480 R14: 0000000000000003 R15: 00007ffca25ef440

The buggy address belongs to the page:
page:ffffea00022ed1c0 count:0 mapcount:0 mapping:0000000000000000 index:0x1
flags: 0xfff00000000000()
raw: 00fff00000000000 ffffea00022ed208 ffffea00022ed188 0000000000000000
raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88808bb47a80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88808bb47b00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88808bb47b80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff88808bb47c00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88808bb47c80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/01/07 03:24 linux-4.19.y 3f8a27f9e27b 1dac8c7a .config console log report syz C [disk image] [vmlinux] [mounted in repro] ci2-linux-4-19 KASAN: use-after-free Read in ntfs_lookup_inode_by_name
* Struck through repros no longer work on HEAD.