syzbot


KASAN: use-after-free Read in search_by_entry_key (3)

Status: upstream: reported C repro on 2022/06/17 02:59
Subsystems: reiserfs
[Documentation on labels]
Reported-by: syzbot+b91428e0adf8831831d2@syzkaller.appspotmail.com
First crash: 674d, last: 480d
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 85d 679d 0/26 auto-obsoleted due to no activity on 2024/04/08 07:18
linux-4.14 KASAN: use-after-free Read in search_by_entry_key (2) reiserfs C error 6 482d 1101d 0/1 upstream: reported C repro on 2021/04/16 06:17
linux-4.14 KASAN: use-after-free Read in search_by_entry_key C done 3 1201d 1307d 1/1 fixed on 2021/02/21 17:18
linux-4.19 KASAN: use-after-free Read in search_by_entry_key C done 1 1202d 1292d 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 16 13d 379d 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 13 1d18h 364d 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 1287d 1291d 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 983d 1134d 1/1 fixed on 2021/09/10 21:17

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+0xcda/0xf30 fs/reiserfs/namei.c:164
Read of size 4 at addr ffff88808a183004 by task syz-executor190/8107

CPU: 1 PID: 8107 Comm: syz-executor190 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_load_n_noabort+0x8b/0xa0 mm/kasan/report.c:443
 bin_search_in_dir_item fs/reiserfs/namei.c:40 [inline]
 search_by_entry_key+0xcda/0xf30 fs/reiserfs/namei.c:164
 reiserfs_find_entry.part.0+0x142/0x1480 fs/reiserfs/namei.c:321
 reiserfs_find_entry fs/reiserfs/namei.c:367 [inline]
 reiserfs_lookup+0x24a/0x490 fs/reiserfs/namei.c:367
 __lookup_slow+0x246/0x4a0 fs/namei.c:1672
 lookup_one_len+0x163/0x190 fs/namei.c:2544
 reiserfs_lookup_privroot+0x92/0x280 fs/reiserfs/xattr.c:970
 reiserfs_fill_super+0x1f12/0x2d80 fs/reiserfs/super.c:2187
 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: 0033:0x7fe539e9292a
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:00007ffff8a7ee28 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007fe539e9292a
RDX: 0000000020000000 RSI: 0000000020000040 RDI: 00007ffff8a7ee40
RBP: 00007ffff8a7ee40 R08: 00007ffff8a7ee80 R09: 0000000000000000
R10: 0000000000208000 R11: 0000000000000286 R12: 0000000000000004
R13: 0000555555e522c0 R14: 0000000000208000 R15: 00007ffff8a7ee80

The buggy address belongs to the page:
page:ffffea00022860c0 count:0 mapcount:0 mapping:0000000000000000 index:0x1
flags: 0xfff00000000000()
raw: 00fff00000000000 ffffea0002286108 ffff8880ba12ea88 0000000000000000
raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88808a182f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88808a182f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88808a183000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff88808a183080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88808a183100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================

Crashes (8):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/12/25 11:38 linux-4.19.y 3f8a27f9e27b 9da18ae8 .config console log report syz C [disk image] [vmlinux] [mounted in repro] ci2-linux-4-19 KASAN: use-after-free Read in search_by_entry_key
2022/10/28 23:07 linux-4.19.y 3f8a27f9e27b 8168b69e .config console log report syz C [disk image] [vmlinux] [mounted in repro] ci2-linux-4-19 KASAN: use-after-free Read in search_by_entry_key
2022/10/15 06:32 linux-4.19.y 3f8a27f9e27b 67cb024c .config console log report syz C [disk image] [vmlinux] [mounted in repro] ci2-linux-4-19 KASAN: use-after-free Read in search_by_entry_key
2022/06/17 02:59 linux-4.19.y 3f8a27f9e27b 1719ee24 .config console log report syz C ci2-linux-4-19 KASAN: use-after-free Read in search_by_entry_key
2022/11/26 03:23 linux-4.19.y 3f8a27f9e27b f4470a7b .config console log report syz C [disk image] [vmlinux] [mounted in repro] ci2-linux-4-19 KASAN: out-of-bounds Read in search_by_entry_key
2022/12/27 18:23 linux-4.19.y 3f8a27f9e27b 44712fbc .config console log report info [disk image] [vmlinux] ci2-linux-4-19 KASAN: use-after-free Read in search_by_entry_key
2022/10/24 17:20 linux-4.19.y 3f8a27f9e27b faae2fda .config console log report info [disk image] [vmlinux] ci2-linux-4-19 KASAN: use-after-free Read in search_by_entry_key
2022/10/15 06:13 linux-4.19.y 3f8a27f9e27b 67cb024c .config console log report info [disk image] [vmlinux] ci2-linux-4-19 KASAN: use-after-free Read in search_by_entry_key
* Struck through repros no longer work on HEAD.