syzbot


KASAN: use-after-free Read in ntfs_attr_find (2)

Status: upstream: reported C repro on 2023/12/22 04:54
Bug presence: origin:upstream
Labels: missing-backport
[Documentation on labels]
Reported-by: syzbot+af4e5d45b6b48a6e89b6@syzkaller.appspotmail.com
First crash: 175d, last: 29d
Fix bisection: the issue occurs on the latest tested release (bisect log)
Crash: KASAN: use-after-free Read in ntfs_attr_find (log)
Repro: C syz .config
  
Bug presence (3)
Date Name Commit Repro Result
2024/03/21 linux-6.1.y (ToT) d7543167affd C [report] KASAN: use-after-free Read in ntfs_attr_find
2023/12/22 upstream (ToT) 24e0d2e527a3 C [report] KASAN: use-after-free Read in ntfs_attr_find
2024/03/21 upstream (ToT) 23956900041d C Didn't crash
Similar bugs (9)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 KASAN: use-after-free Read in ntfs_attr_find missing-backport origin:lts-only C error 4 26d 146d 0/3 upstream: reported C repro on 2024/01/20 12:39
upstream KASAN: use-after-free Read in ntfs_attr_find ntfs3 C done 74 493d 659d 22/27 fixed on 2023/02/24 13:50
linux-6.1 KASAN: use-after-free Read in ntfs_attr_find 3 418d 430d 0/3 auto-obsoleted due to no activity on 2023/08/21 05:46
linux-4.14 KASAN: slab-out-of-bounds Read in ntfs_attr_find (2) C 31 474d 659d 0/1 upstream: reported C repro on 2022/08/25 11:21
upstream KASAN: use-after-free Read in ntfs_attr_find (2) ntfs3 C error done 22 117d 471d 0/27 auto-obsoleted due to no activity on 2024/05/28 05:52
linux-4.19 KASAN: use-after-free Read in ntfs_attr_find (2) C 1 475d 475d 0/1 upstream: reported C repro on 2023/02/26 02:15
linux-4.14 KASAN: use-after-free Read in ntfs_attr_find C done 4 1341d 1360d 1/1 fixed on 2020/11/12 10:36
linux-4.19 KASAN: use-after-free Read in ntfs_attr_find C done 13 1326d 1357d 1/1 fixed on 2020/11/27 11:32
linux-5.15 KASAN: slab-out-of-bounds Read in ntfs_attr_find 1 418d 418d 0/3 auto-obsoleted due to no activity on 2023/08/22 04:27
Fix bisection attempts (3)
Created Duration User Patch Repo Result
2024/04/01 10:58 2h22m fix candidate upstream job log (0)
2024/03/01 05:41 1h35m bisect fix linux-6.1.y job log (0) log
2024/01/21 16:21 1h52m bisect fix linux-6.1.y job log (0) log

Sample crash report:
loop0: detected capacity change from 0 to 4096
==================================================================
BUG: KASAN: use-after-free in ntfs_attr_find+0x5a0/0x9d0 fs/ntfs/attrib.c:609
Read of size 2 at addr ffff0000df9af442 by task syz-executor958/4223

CPU: 0 PID: 4223 Comm: syz-executor958 Not tainted 6.1.90-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call trace:
 dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:284 [inline]
 print_report+0x174/0x4c0 mm/kasan/report.c:395
 kasan_report+0xd4/0x130 mm/kasan/report.c:495
 __asan_report_load_n_noabort+0x28/0x34 mm/kasan/report_generic.c:361
 ntfs_attr_find+0x5a0/0x9d0 fs/ntfs/attrib.c:609
 ntfs_attr_lookup+0x3dc/0x1cd8
 ntfs_read_locked_inode+0x87c/0x38e0 fs/ntfs/inode.c:666
 ntfs_iget+0x110/0x19c fs/ntfs/inode.c:177
 load_and_init_mft_mirror fs/ntfs/super.c:1027 [inline]
 load_system_files+0xe4/0x4734 fs/ntfs/super.c:1772
 ntfs_fill_super+0x14e0/0x2314 fs/ntfs/super.c:2892
 mount_bdev+0x274/0x370 fs/super.c:1432
 ntfs_mount+0x44/0x58 fs/ntfs/super.c:3049
 legacy_get_tree+0xd4/0x16c fs/fs_context.c:632
 vfs_get_tree+0x90/0x274 fs/super.c:1562
 do_new_mount+0x278/0x8fc fs/namespace.c:3051
 path_mount+0x590/0xe5c fs/namespace.c:3381
 do_mount fs/namespace.c:3394 [inline]
 __do_sys_mount fs/namespace.c:3602 [inline]
 __se_sys_mount fs/namespace.c:3579 [inline]
 __arm64_sys_mount+0x45c/0x594 fs/namespace.c:3579
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206
 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

The buggy address belongs to the physical page:
page:00000000ecfc461d refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x11f9af
flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000000000 fffffc0005c6d8c8 fffffc0006208588 0000000000000000
raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000df9af300: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000df9af380: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff0000df9af400: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                           ^
 ffff0000df9af480: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000df9af500: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
ntfs: (device loop0): ntfs_attr_find(): Inode is corrupt.  Run chkdsk.
ntfs: (device loop0): ntfs_read_locked_inode(): Failed to lookup attribute list attribute.
ntfs: (device loop0): ntfs_read_locked_inode(): Failed with error code -5.  Marking corrupt inode 0x1 as bad.  Run chkdsk.
ntfs: (device loop0): load_system_files(): Failed to load $MFTMirr.  Will not be able to remount read-write.  Run ntfsfix and/or chkdsk.
ntfs: (device loop0): map_mft_record_page(): Mft record 0xa is corrupt.  Run chkdsk.
ntfs: (device loop0): map_mft_record(): Failed with error code 5.
ntfs: (device loop0): ntfs_read_locked_inode(): Failed with error code -5.  Marking corrupt inode 0xa as bad.  Run chkdsk.
ntfs: (device loop0): load_and_init_upcase(): Failed to load $UpCase from the volume. Using default.
syz-executor958: attempt to access beyond end of device
loop0: rw=0, sector=32768, nr_sectors = 2 limit=4096
ntfs: (device loop0): ntfs_end_buffer_async_read(): Buffer I/O error, logical block 0x4000.
syz-executor958: attempt to access beyond end of device
loop0: rw=0, sector=32770, nr_sectors = 2 limit=4096
ntfs: (device loop0): ntfs_end_buffer_async_read(): Buffer I/O error, logical block 0x4001.
syz-executor958: attempt to access beyond end of device
loop0: rw=0, sector=32772, nr_sectors = 2 limit=4096

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/05/16 08:27 linux-6.1.y 909ba1f1b414 ef5d53ed .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan-arm64 KASAN: use-after-free Read in ntfs_attr_find
2023/12/22 04:53 linux-6.1.y 4aa6747d9352 4f9530a3 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan-arm64 KASAN: use-after-free Read in ntfs_attr_find
* Struck through repros no longer work on HEAD.