syzbot


KASAN: use-after-free Read in search_by_entry_key

Status: upstream: reported C repro on 2023/04/23 10:15
Bug presence: origin:upstream
[Documentation on labels]
Reported-by: syzbot+f1695d226551f134846a@syzkaller.appspotmail.com
First crash: 311d, last: 33d
Bug presence (1)
Date Name Commit Repro Result
2023/05/18 upstream (ToT) 4d6d4c7f541d C [report] KASAN: use-after-free Read in search_by_entry_key
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 33d 626d 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 (2) reiserfs C error 6 429d 1049d 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 1149d 1255d 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 428d 622d 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 1150d 1240d 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 102d 326d 0/3 upstream: reported C repro on 2023/04/08 09:36
upstream KASAN: use-after-free Read in search_by_entry_key reiserfs C done 3 1235d 1238d 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 931d 1081d 1/1 fixed on 2021/09/10 21:17
Fix bisection attempts (3)
Created Duration User Patch Repo Result
2024/01/01 14:04 1h35m bisect fix linux-6.1.y job log (0) log
2023/10/26 04:49 1h48m bisect fix linux-6.1.y job log (0) log
2023/07/16 18:11 2h25m bisect fix linux-6.1.y job log (0) log

Sample crash report:
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 tea 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+0x45c/0xe88 fs/reiserfs/namei.c:165
Read of size 4 at addr ffff0000e0c62fc4 by task syz-executor275/4223

CPU: 0 PID: 4223 Comm: syz-executor275 Not tainted 6.1.75-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
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+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
 bin_search_in_dir_item fs/reiserfs/namei.c:40 [inline]
 search_by_entry_key+0x45c/0xe88 fs/reiserfs/namei.c:165
 reiserfs_find_entry+0x288/0x149c fs/reiserfs/namei.c:322
 reiserfs_lookup+0x184/0x3c4 fs/reiserfs/namei.c:368
 __lookup_slow+0x250/0x374 fs/namei.c:1690
 lookup_one_len+0x178/0x28c fs/namei.c:2742
 reiserfs_lookup_privroot+0x8c/0x204 fs/reiserfs/xattr.c:973
 reiserfs_fill_super+0x1bc0/0x2028 fs/reiserfs/super.c:2174
 mount_bdev+0x274/0x370 fs/super.c:1432
 get_super_block+0x44/0x58 fs/reiserfs/super.c:2601
 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:00000000cbd9c801 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x120c62
flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000000000 fffffc00038318c8 fffffc0003831848 0000000000000000
raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000e0c62e80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000e0c62f00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff0000e0c62f80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                           ^
 ffff0000e0c63000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000e0c63080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
REISERFS warning (device loop0): jdm-13090 reiserfs_new_inode: ACLs aren't enabled in the fs, but vfs thinks they are!
REISERFS (device loop0): Created .reiserfs_priv - reserved for xattr storage.

Crashes (12):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/01/27 02:37 linux-6.1.y 883d1a956208 cc4a4020 .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 search_by_entry_key
2023/09/21 13:08 linux-6.1.y a356197db198 0b6a67ac .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 search_by_entry_key
2023/05/10 03:17 linux-6.1.y ca48fc16c493 30aa2a7e .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 search_by_entry_key
2023/06/09 04:23 linux-6.1.y 76ba310227d2 058b3a5a .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan KASAN: use-after-free Read in search_by_entry_key
2023/11/17 02:28 linux-6.1.y fb2635ac69ab cb976f63 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in search_by_entry_key
2023/12/01 21:48 linux-6.1.y 6ac30d748bb0 f819d6f7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: use-after-free Read in search_by_entry_key
2023/11/19 01:30 linux-6.1.y fb2635ac69ab cb976f63 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: use-after-free Read in search_by_entry_key
2023/09/21 12:32 linux-6.1.y a356197db198 0b6a67ac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: use-after-free Read in search_by_entry_key
2023/05/16 10:56 linux-6.1.y bf4ad6fa4e53 71b00cfb .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in search_by_entry_key
2023/05/22 06:46 linux-6.1.y fa74641fb6b9 4bce1a3e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: use-after-free Read in search_by_entry_key
2023/05/14 08:43 linux-6.1.y bf4ad6fa4e53 2b9ba477 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: use-after-free Read in search_by_entry_key
2023/04/23 10:15 linux-6.1.y f17b0ab65d17 2b32bd34 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: use-after-free Read in search_by_entry_key
* Struck through repros no longer work on HEAD.