syzbot


KASAN: use-after-free Read in ntfs_read_folio

Status: fixed on 2024/03/20 11:33
Subsystems: ntfs3
[Documentation on labels]
Reported-by: syzbot+d3cd38158cd7c8d1432c@syzkaller.appspotmail.com
Fix commit: 6f861765464f fs: Block writes to mounted block devices
First crash: 398d, last: 90d
Cause bisection: failed (error log, bisect log)
  
Fix bisection: fixed by (bisect log) :
commit 6f861765464f43a71462d52026fbddfc858239a5
Author: Jan Kara <jack@suse.cz>
Date: Wed Nov 1 17:43:10 2023 +0000

  fs: Block writes to mounted block devices

  
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [ntfs?] KASAN: use-after-free Read in ntfs_read_folio 1 (3) 2024/03/14 10:57
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 KASAN: use-after-free Read in ntfs_read_folio origin:upstream missing-backport C inconclusive 5 32d 397d 0/3 upstream: reported C repro on 2023/03/18 10:25
Last patch testing requests (10)
Created Duration User Patch Repo Result
2024/03/02 07:38 27m retest repro upstream OK log
2024/02/02 16:26 24m retest repro upstream OK log
2024/01/19 12:29 17m retest repro git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci report log
2024/01/18 12:30 20m retest repro upstream OK log
2024/01/18 12:30 39m retest repro upstream OK log
2024/01/18 12:30 19m retest repro upstream OK log
2024/01/18 12:30 21m retest repro upstream OK log
2024/01/18 12:30 17m retest repro upstream OK log
2023/11/22 23:27 16m retest repro upstream report log
2023/11/08 22:53 22m retest repro git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci report log
Fix bisection attempts (6)
Created Duration User Patch Repo Result
2024/02/27 06:18 5h30m bisect fix upstream job log (1)
2023/12/23 00:18 2h09m bisect fix upstream job log (0) log
2023/10/25 19:42 1h57m bisect fix upstream job log (0) log
2023/06/27 03:05 55m bisect fix upstream job log (0) log
2023/05/26 16:33 49m bisect fix upstream job log (0) log
2023/04/16 20:12 45m bisect fix upstream job log (0) log

Sample crash report:
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.
==================================================================
BUG: KASAN: use-after-free in ntfs_read_folio+0x6d4/0x200c fs/ntfs/aops.c:489
Read of size 1 at addr ffff0000e11f617f by task syz-executor319/5946

CPU: 0 PID: 5946 Comm: syz-executor319 Not tainted 6.3.0-rc1-syzkaller-gfe15c26ee26e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
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+0xd0/0x124 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:319 [inline]
 print_report+0x174/0x514 mm/kasan/report.c:430
 kasan_report+0xd4/0x130 mm/kasan/report.c:536
 kasan_check_range+0x264/0x2a4 mm/kasan/generic.c:187
 __asan_memcpy+0x48/0x90 mm/kasan/shadow.c:105
 ntfs_read_folio+0x6d4/0x200c fs/ntfs/aops.c:489
 filemap_read_folio+0x14c/0x39c mm/filemap.c:2424
 do_read_cache_folio+0x24c/0x544 mm/filemap.c:3683
 do_read_cache_page mm/filemap.c:3749 [inline]
 read_cache_page+0x6c/0x180 mm/filemap.c:3758
 read_mapping_page include/linux/pagemap.h:769 [inline]
 ntfs_map_page fs/ntfs/aops.h:75 [inline]
 load_and_init_attrdef fs/ntfs/super.c:1617 [inline]
 load_system_files+0x1e34/0x4734 fs/ntfs/super.c:1825
 ntfs_fill_super+0x14e0/0x2314 fs/ntfs/super.c:2900
 mount_bdev+0x26c/0x368 fs/super.c:1371
 ntfs_mount+0x44/0x58 fs/ntfs/super.c:3057
 legacy_get_tree+0xd4/0x16c fs/fs_context.c:610
 vfs_get_tree+0x90/0x274 fs/super.c:1501
 do_new_mount+0x25c/0x8c8 fs/namespace.c:3042
 path_mount+0x590/0xe20 fs/namespace.c:3372
 do_mount fs/namespace.c:3385 [inline]
 __do_sys_mount fs/namespace.c:3594 [inline]
 __se_sys_mount fs/namespace.c:3571 [inline]
 __arm64_sys_mount+0x45c/0x594 fs/namespace.c:3571
 __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+0x64/0x198 arch/arm64/kernel/syscall.c:193
 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+0x190/0x194 arch/arm64/kernel/entry.S:591

The buggy address belongs to the physical page:
page:00000000b1c79ae3 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x1211f6
flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000000000 fffffc0003847848 fffffc0003847d48 0000000000000000
raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000e11f6000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000e11f6080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff0000e11f6100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                                                ^
 ffff0000e11f6180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000e11f6200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
ntfs: volume version 3.1.
syz-executor319: attempt to access beyond end of device
loop0: rw=0, sector=2072, nr_sectors = 8 limit=190
ntfs: (device loop0): ntfs_end_buffer_async_read(): Buffer I/O error, logical block 0x103.
syz-executor319: attempt to access beyond end of device
loop0: rw=0, sector=552, nr_sectors = 8 limit=190
syz-executor319: attempt to access beyond end of device
loop0: rw=0, sector=224, nr_sectors = 8 limit=190

Crashes (12):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/03/17 15:39 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci fe15c26ee26e 18b58603 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-gce-arm64 KASAN: use-after-free Read in ntfs_read_folio
2024/01/04 10:10 upstream ac865f00af29 28c42cff .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs KASAN: use-after-free Read in ntfs_read_folio
2023/12/30 12:04 upstream f016f7547aee fb427a07 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs KASAN: use-after-free Read in ntfs_read_folio
2023/12/30 00:19 upstream 8735c7c84d1b fb427a07 .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs KASAN: use-after-free Read in ntfs_read_folio
2023/08/28 02:42 upstream 85eb043618bb 03d9c195 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-kasan-gce-smack-root KASAN: use-after-free Read in ntfs_read_folio
2023/03/17 19:42 upstream 38e04b3e4240 7939252e .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs KASAN: use-after-free Read in ntfs_read_folio
2023/12/30 07:16 upstream f016f7547aee fb427a07 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs KASAN: out-of-bounds Read in ntfs_read_folio
2023/12/29 05:13 upstream 505e701c0b2c fb427a07 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs KASAN: out-of-bounds Read in ntfs_read_folio
2023/12/29 05:43 upstream 505e701c0b2c fb427a07 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: use-after-free Read in ntfs_read_folio
2023/12/29 05:15 upstream 505e701c0b2c fb427a07 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: use-after-free Read in ntfs_read_folio
2023/12/29 04:53 upstream 505e701c0b2c fb427a07 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: use-after-free Read in ntfs_read_folio
2023/03/17 15:26 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci fe15c26ee26e 18b58603 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 KASAN: use-after-free Read in ntfs_read_folio
* Struck through repros no longer work on HEAD.