syzbot


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

Status: upstream: reported C repro on 2021/04/16 06:17
Subsystems: reiserfs
[Documentation on labels]
Reported-by: syzbot+42d685ccd71d27232b90@syzkaller.appspotmail.com
First crash: 1046d, last: 427d
Fix bisection: failed (error log, bisect log)
  
Similar bugs (8)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KASAN: use-after-free Read in search_by_entry_key (2) reiserfs C inconclusive inconclusive 139 31d 624d 0/26 upstream: reported C repro on 2022/06/12 10:38
linux-4.14 KASAN: use-after-free Read in search_by_entry_key C done 3 1146d 1252d 1/1 fixed on 2021/02/21 17:18
linux-4.19 KASAN: use-after-free Read in search_by_entry_key (3) reiserfs C error 8 426d 619d 0/1 upstream: reported C repro on 2022/06/17 02:59
linux-4.19 KASAN: use-after-free Read in search_by_entry_key C done 1 1147d 1238d 1/1 fixed on 2021/02/20 09:47
linux-5.15 KASAN: use-after-free Read in search_by_entry_key origin:upstream C error 11 100d 324d 0/3 upstream: reported C repro on 2023/04/08 09:36
linux-6.1 KASAN: use-after-free Read in search_by_entry_key origin:upstream C 12 30d 309d 0/3 upstream: reported C repro on 2023/04/23 10:15
upstream KASAN: use-after-free Read in search_by_entry_key reiserfs C done 3 1232d 1236d 19/26 fixed on 2021/03/10 01:49
linux-4.19 KASAN: use-after-free Read in search_by_entry_key (2) C done 2 929d 1079d 1/1 fixed on 2021/09/10 21:17
Fix bisection attempts (18)
Created Duration User Patch Repo Result
2022/10/13 02:24 0m bisect fix linux-4.14.y error job log (0)
2022/09/10 09:05 19m bisect fix linux-4.14.y job log (0) log
2022/08/11 08:25 27m bisect fix linux-4.14.y job log (0) log
2022/07/12 08:02 19m bisect fix linux-4.14.y job log (0) log
2022/06/11 22:43 23m bisect fix linux-4.14.y job log (0) log
2022/05/12 22:15 26m bisect fix linux-4.14.y job log (0) log
2022/04/12 21:53 22m bisect fix linux-4.14.y job log (0) log
2022/03/13 21:26 26m bisect fix linux-4.14.y job log (0) log
2022/02/10 22:35 23m bisect fix linux-4.14.y job log (0) log
2022/01/11 22:03 31m bisect fix linux-4.14.y job log (0) log
2021/12/12 21:23 28m bisect fix linux-4.14.y job log (0) log
2021/11/12 19:19 21m bisect fix linux-4.14.y job log (0) log
2021/10/13 18:50 29m bisect fix linux-4.14.y job log (0) log
2021/09/13 18:21 24m bisect fix linux-4.14.y job log (0) log
2021/08/14 17:52 22m bisect fix linux-4.14.y job log (0) log
2021/07/15 17:20 31m bisect fix linux-4.14.y job log (0) log
2021/06/15 16:57 23m bisect fix linux-4.14.y job log (0) log
2021/05/16 14:59 27m bisect fix linux-4.14.y job log (0) log

Sample crash report:
reiserfs: using flush barriers
REISERFS (device loop0): journal params: device loop0, size 512, journal first block 18, max trans len 256, max batch 225, max commit age 30, max trans age 30
REISERFS (device loop0): checking transaction log (loop0)
REISERFS (device loop0): Using r5 hash to sort names
==================================================================
BUG: KASAN: use-after-free in bin_search_in_dir_item fs/reiserfs/namei.c:40 [inline]
BUG: KASAN: use-after-free in search_by_entry_key+0xc7e/0xf50 fs/reiserfs/namei.c:164
Read of size 4 at addr ffff88808b3f4004 by task syz-executor287/7975

CPU: 1 PID: 7975 Comm: syz-executor287 Not tainted 4.14.302-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:252
 kasan_report_error.cold+0x8a/0x191 mm/kasan/report.c:351
 kasan_report mm/kasan/report.c:409 [inline]
 __asan_report_load_n_noabort+0x6b/0x80 mm/kasan/report.c:440
 bin_search_in_dir_item fs/reiserfs/namei.c:40 [inline]
 search_by_entry_key+0xc7e/0xf50 fs/reiserfs/namei.c:164
 reiserfs_find_entry.part.0+0x138/0x11e0 fs/reiserfs/namei.c:321
 reiserfs_find_entry fs/reiserfs/namei.c:367 [inline]
 reiserfs_lookup+0x1fd/0x400 fs/reiserfs/namei.c:367
 lookup_real fs/namei.c:1555 [inline]
 __lookup_hash fs/namei.c:1575 [inline]
 __lookup_hash+0x1bb/0x270 fs/namei.c:1563
 lookup_one_len+0x279/0x3a0 fs/namei.c:2539
 reiserfs_lookup_privroot+0x92/0x270 fs/reiserfs/xattr.c:970
 reiserfs_fill_super+0x1d12/0x2990 fs/reiserfs/super.c:2187
 mount_bdev+0x2b3/0x360 fs/super.c:1134
 mount_fs+0x92/0x2a0 fs/super.c:1237
 vfs_kern_mount.part.0+0x5b/0x470 fs/namespace.c:1046
 vfs_kern_mount fs/namespace.c:1036 [inline]
 do_new_mount fs/namespace.c:2572 [inline]
 do_mount+0xe65/0x2a30 fs/namespace.c:2905
 SYSC_mount fs/namespace.c:3121 [inline]
 SyS_mount+0xa8/0x120 fs/namespace.c:3098
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x5e/0xd3
RIP: 0033:0x7ff59ac1a92a
RSP: 002b:00007fffbc524d88 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007ff59ac1a92a
RDX: 0000000020000000 RSI: 0000000020000040 RDI: 00007fffbc524da0
RBP: 00007fffbc524da0 R08: 00007fffbc524de0 R09: 0000000000000000
R10: 0000000000208000 R11: 0000000000000286 R12: 0000000000000004
R13: 000055555712c2c0 R14: 0000000000208000 R15: 00007fffbc524de0

The buggy address belongs to the page:
page:ffffea00022cfd00 count:0 mapcount:0 mapping:          (null) index:0x1
flags: 0xfff00000000000()
raw: 00fff00000000000 0000000000000000 0000000000000001 00000000ffffffff
raw: ffffea00022cfd60 ffffea00023b7560 0000000000000000 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88808b3f3f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88808b3f3f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88808b3f4000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff88808b3f4080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88808b3f4100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================

Crashes (6):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/12/26 11:02 linux-4.14.y c4215ee4771b 9da18ae8 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-4-14 KASAN: use-after-free Read in search_by_entry_key
2022/12/02 21:45 linux-4.14.y 179ef7fe8677 e080de16 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-4-14 KASAN: use-after-free Read in search_by_entry_key
2022/10/31 03:43 linux-4.14.y 41f36d7859a7 2a71366b .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-4-14 KASAN: use-after-free Read in search_by_entry_key
2022/10/16 03:16 linux-4.14.y 9d5c0b3a8e1a 67cb024c .config console log report syz C [disk image] [vmlinux] [mounted in repro] ci2-linux-4-14 KASAN: use-after-free Read in search_by_entry_key
2022/06/12 08:02 linux-4.14.y b8f3be299d51 0d5abf15 .config console log report syz C ci2-linux-4-14 KASAN: use-after-free Read in search_by_entry_key
2021/04/16 06:16 linux-4.14.y 958e517f4e16 c59079a6 .config console log report syz C ci2-linux-4-14 KASAN: use-after-free Read in search_by_entry_key
* Struck through repros no longer work on HEAD.