syzbot


KASAN: use-after-free Read in ntfs_iget

Status: fixed on 2021/04/09 19:46
Subsystems: ntfs3
[Documentation on labels]
Reported-by: syzbot+c584225dabdea2f71969@syzkaller.appspotmail.com
Fix commit: 4dfe6bd94959 ntfs: check for valid standard information attribute
First crash: 1338d, last: 1338d
Cause bisection: failed (error log, bisect log)
  
Fix bisection: failed (error log, bisect log)
  
Discussions (11)
Title Replies (including bot) Last reply
[PATCH 4.19 000/247] 4.19.178-rc1 review 277 (277) 2022/03/02 15:52
[PATCH 4.4 00/93] 4.4.259-rc1 review 99 (99) 2021/03/02 19:02
[PATCH 4.9 000/134] 4.9.259-rc1 review 137 (137) 2021/03/01 21:45
[PATCH 4.14 000/176] 4.14.223-rc1 review 177 (177) 2021/03/01 16:14
[PATCH 5.10 00/23] 5.10.19-rc1 review 32 (32) 2021/02/27 01:47
[PATCH 5.4 00/17] 5.4.101-rc1 review 23 (23) 2021/02/26 09:28
[PATCH 5.11 00/12] 5.11.2-rc1 review 17 (17) 2021/02/26 08:00
[patch 007/173] ntfs: check for valid standard information attribute 1 (1) 2021/02/24 20:00
[PATCH] ntfs: check for valid standard information attribute 5 (5) 2021/02/22 16:17
[PATCH] ntfs: move check for valid resident attribute offset and length 3 (3) 2021/02/16 16:24
KASAN: use-after-free Read in ntfs_iget 0 (1) 2020/11/27 20:57
Similar bugs (4)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.14 KASAN: use-after-free Read in ntfs_iget C done 2 1248d 1324d 1/1 fixed on 2021/03/23 15:18
linux-4.19 KASAN: use-after-free Read in ntfs_iget C done 1 1245d 1305d 1/1 fixed on 2021/03/29 19:17
linux-4.19 KASAN: use-after-free Read in ntfs_iget (2) C done 1 1127d 1127d 1/1 fixed on 2021/07/22 23:24
upstream KASAN: use-after-free Read in ntfs_iget (2) ntfs3 C inconclusive 2 1146d 1142d 20/27 fixed on 2021/11/10 00:50
Last patch testing requests (2)
Created Duration User Patch Repo Result
2021/02/17 14:02 18m rkovhaev@gmail.com patch upstream OK
2021/02/14 21:44 18m rkovhaev@gmail.com patch upstream OK

Sample crash report:
==================================================================
BUG: KASAN: use-after-free in ntfs_read_locked_inode+0x49dc/0x58b0 fs/ntfs/inode.c:645
Read of size 8 at addr ffff8880374ee6cd by task syz-executor401/8528

CPU: 1 PID: 8528 Comm: syz-executor401 Not tainted 5.10.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x107/0x163 lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0xae/0x497 mm/kasan/report.c:385
 __kasan_report mm/kasan/report.c:545 [inline]
 kasan_report.cold+0x1f/0x37 mm/kasan/report.c:562
 ntfs_read_locked_inode+0x49dc/0x58b0 fs/ntfs/inode.c:645
 ntfs_iget+0x12d/0x180 fs/ntfs/inode.c:177
 load_and_init_attrdef fs/ntfs/super.c:1589 [inline]
 load_system_files fs/ntfs/super.c:1817 [inline]
 ntfs_fill_super+0x255c/0x8560 fs/ntfs/super.c:2893
 mount_bdev+0x32e/0x3f0 fs/super.c:1419
 legacy_get_tree+0x105/0x220 fs/fs_context.c:592
 vfs_get_tree+0x89/0x2f0 fs/super.c:1549
 do_new_mount fs/namespace.c:2875 [inline]
 path_mount+0x13ad/0x20c0 fs/namespace.c:3205
 do_mount fs/namespace.c:3218 [inline]
 __do_sys_mount fs/namespace.c:3426 [inline]
 __se_sys_mount fs/namespace.c:3403 [inline]
 __x64_sys_mount+0x27f/0x300 fs/namespace.c:3403
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x44954a
Code: b8 08 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 7d a3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 5a a3 fb ff c3 66 0f 1f 84 00 00 00 00 00
RSP: 002b:00007ffe2910bd28 EFLAGS: 00000287 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffe2910bd80 RCX: 000000000044954a
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ffe2910bd40
RBP: 00007ffe2910bd40 R08: 00007ffe2910bd80 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000287 R12: 00000000000000ac
R13: 0000000000000004 R14: 0000000000000003 R15: 0000000000000003

The buggy address belongs to the page:
page:00000000dbe06e8c refcount:1 mapcount:0 mapping:0000000069d82f88 index:0x200 pfn:0x374ee
aops:shmem_aops ino:40b dentry name:"memfd:syzkaller"
flags: 0xfff0000008001e(referenced|uptodate|dirty|lru|swapbacked)
raw: 00fff0000008001e ffffea0000ca4a08 ffffea0000d8de88 ffff8880287936a8
raw: 0000000000000200 0000000000000000 00000001ffffffff ffff888010e00000
page dumped because: kasan: bad access detected
page->mem_cgroup:ffff888010e00000

Memory state around the buggy address:
 ffff8880374ee580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8880374ee600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8880374ee680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                                              ^
 ffff8880374ee700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8880374ee780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2020/11/23 20:55 upstream 418baf2c28f3 878fb17a .config console log report syz C ci-upstream-kasan-gce-selinux-root
* Struck through repros no longer work on HEAD.