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UBSAN: array-index-out-of-bounds in jfs_readdir

Status: upstream: reported C repro on 2024/04/01 00:20
Bug presence: origin:upstream
[Documentation on labels]
Reported-by: syzbot+86aff299c9c99b870520@syzkaller.appspotmail.com
First crash: 31d, last: 15d
▶ ▼ Bug presence (1)
Date Name Commit Repro Result
2024/04/01 upstream (ToT) 39cd87c4eb2b C [report] UBSAN: array-index-out-of-bounds in jfs_readdir
▶ ▼ Similar bugs (5)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KASAN: slab-out-of-bounds Read in jfs_readdir jfs C error done 17 115d 476d 26/26 fixed on 2024/03/20 11:33
linux-6.1 UBSAN: array-index-out-of-bounds in jfs_readdir origin:upstream C 31 6d13h 31d 0/3 upstream: reported C repro on 2024/04/01 00:16
upstream UBSAN: array-index-out-of-bounds in jfs_readdir jfs C inconclusive 28 4d16h 31d 0/26 upstream: reported C repro on 2024/04/01 14:07
linux-4.14 KASAN: slab-out-of-bounds Read in jfs_readdir jfs 1 476d 476d 0/1 upstream: reported on 2023/01/12 07:34
linux-4.19 KASAN: slab-out-of-bounds Read in jfs_readdir jfs 2 476d 476d 0/1 upstream: reported on 2023/01/12 07:27

Sample crash report:
loop0: detected capacity change from 0 to 32768
================================================================================
UBSAN: array-index-out-of-bounds in fs/jfs/jfs_dtree.c:3190:30
index -1 is out of range for type 'struct dtslot[128]'
CPU: 1 PID: 3958 Comm: syz-executor101 Not tainted 5.15.153-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call trace:
 dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 dump_stack+0x1c/0x58 lib/dump_stack.c:113
 ubsan_epilogue lib/ubsan.c:151 [inline]
 __ubsan_handle_out_of_bounds+0x108/0x15c lib/ubsan.c:282
 jfs_readdir+0x16a4/0x385c fs/jfs/jfs_dtree.c:3190
 iterate_dir+0x1f4/0x4e4
 __do_sys_getdents64 fs/readdir.c:369 [inline]
 __se_sys_getdents64 fs/readdir.c:354 [inline]
 __arm64_sys_getdents64+0x1c4/0x4c4 fs/readdir.c:354
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
================================================================================
================================================================================
UBSAN: array-index-out-of-bounds in fs/jfs/jfs_dtree.c:2945:28
index -1 is out of range for type 'struct dtslot[128]'
CPU: 1 PID: 3958 Comm: syz-executor101 Not tainted 5.15.153-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call trace:
 dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 dump_stack+0x1c/0x58 lib/dump_stack.c:113
 ubsan_epilogue lib/ubsan.c:151 [inline]
 __ubsan_handle_out_of_bounds+0x108/0x15c lib/ubsan.c:282
 add_missing_indices fs/jfs/jfs_dtree.c:2945 [inline]
 jfs_readdir+0x1f54/0x385c fs/jfs/jfs_dtree.c:3307
 iterate_dir+0x1f4/0x4e4
 __do_sys_getdents64 fs/readdir.c:369 [inline]
 __se_sys_getdents64 fs/readdir.c:354 [inline]
 __arm64_sys_getdents64+0x1c4/0x4c4 fs/readdir.c:354
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
================================================================================
================================================================================
UBSAN: array-index-out-of-bounds in fs/jfs/jfs_imap.c:750:12
index 255 is out of range for type 'struct dtslot[128]'
CPU: 1 PID: 3958 Comm: syz-executor101 Not tainted 5.15.153-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call trace:
 dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 dump_stack+0x1c/0x58 lib/dump_stack.c:113
 ubsan_epilogue lib/ubsan.c:151 [inline]
 __ubsan_handle_out_of_bounds+0x108/0x15c lib/ubsan.c:282
 diWrite+0xbcc/0x1604 fs/jfs/jfs_imap.c:750
 txCommit+0x754/0x55b0 fs/jfs/jfs_txnmgr.c:1255
 add_missing_indices fs/jfs/jfs_dtree.c:2959 [inline]
 jfs_readdir+0x1fd0/0x385c fs/jfs/jfs_dtree.c:3307
 iterate_dir+0x1f4/0x4e4
 __do_sys_getdents64 fs/readdir.c:369 [inline]
 __se_sys_getdents64 fs/readdir.c:354 [inline]
 __arm64_sys_getdents64+0x1c4/0x4c4 fs/readdir.c:354
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
================================================================================
================================================================================
UBSAN: array-index-out-of-bounds in fs/jfs/jfs_imap.c:750:35
index 255 is out of range for type 'struct dtslot[128]'
CPU: 1 PID: 3958 Comm: syz-executor101 Not tainted 5.15.153-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call trace:
 dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 dump_stack+0x1c/0x58 lib/dump_stack.c:113
 ubsan_epilogue lib/ubsan.c:151 [inline]
 __ubsan_handle_out_of_bounds+0x108/0x15c lib/ubsan.c:282
 diWrite+0xc24/0x1604 fs/jfs/jfs_imap.c:750
 txCommit+0x754/0x55b0 fs/jfs/jfs_txnmgr.c:1255
 add_missing_indices fs/jfs/jfs_dtree.c:2959 [inline]
 jfs_readdir+0x1fd0/0x385c fs/jfs/jfs_dtree.c:3307
 iterate_dir+0x1f4/0x4e4
 __do_sys_getdents64 fs/readdir.c:369 [inline]
 __se_sys_getdents64 fs/readdir.c:354 [inline]
 __arm64_sys_getdents64+0x1c4/0x4c4 fs/readdir.c:354
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
================================================================================
==================================================================
BUG: KASAN: slab-out-of-bounds in diWrite+0xb48/0x1604 fs/jfs/jfs_imap.c:750
Read of size 32 at addr ffff0000df8e5110 by task syz-executor101/3958

CPU: 1 PID: 3958 Comm: syz-executor101 Not tainted 5.15.153-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call trace:
 dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 print_address_description+0x7c/0x3f0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:434 [inline]
 kasan_report+0x174/0x1e4 mm/kasan/report.c:451
 kasan_check_range+0x274/0x2b4 mm/kasan/generic.c:189
 memcpy+0x90/0xe8 mm/kasan/shadow.c:65
 diWrite+0xb48/0x1604 fs/jfs/jfs_imap.c:750
 txCommit+0x754/0x55b0 fs/jfs/jfs_txnmgr.c:1255
 add_missing_indices fs/jfs/jfs_dtree.c:2959 [inline]
 jfs_readdir+0x1fd0/0x385c fs/jfs/jfs_dtree.c:3307
 iterate_dir+0x1f4/0x4e4
 __do_sys_getdents64 fs/readdir.c:369 [inline]
 __se_sys_getdents64 fs/readdir.c:354 [inline]
 __arm64_sys_getdents64+0x1c4/0x4c4 fs/readdir.c:354
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584

Allocated by task 0:
(stack is not available)

The buggy address belongs to the object at ffff0000df8e4a00
 which belongs to the cache jfs_ip of size 2240
The buggy address is located 1808 bytes inside of
 2240-byte region [ffff0000df8e4a00, ffff0000df8e52c0)
The buggy address belongs to the page:
page:00000000b0f34806 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11f8e0
head:00000000b0f34806 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000010200 0000000000000000 dead000000000122 ffff0000c650b380
raw: 0000000000000000 00000000800d000d 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000df8e5000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff0000df8e5080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff0000df8e5100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                         ^
 ffff0000df8e5180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff0000df8e5200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
ERROR: (device loop0): jfs_readdir: JFS:Dtree error: ino = 2, bn=0, index = 0

ERROR: (device loop0): remounting filesystem as read-only
ERROR: (device loop0): jfs_readdir: JFS:Dtree error: ino = 2, bn=0, index = 1

ERROR: (device loop0): jfs_readdir: JFS:Dtree error: ino = 2, bn=0, index = 2

ERROR: (device loop0): jfs_readdir: JFS:Dtree error: ino = 2, bn=0, index = 3

ERROR: (device loop0): jfs_readdir: JFS:Dtree error: ino = 2, bn=0, index = 4

Crashes (15):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/04/01 04:28 linux-5.15.y 9465fef4ae35 6baf5069 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan-arm64 UBSAN: array-index-out-of-bounds in jfs_readdir
2024/04/17 01:03 linux-5.15.y fa3df276cd36 18f6e127 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 UBSAN: array-index-out-of-bounds in jfs_readdir
2024/04/14 02:33 linux-5.15.y fa3df276cd36 c8349e48 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 UBSAN: array-index-out-of-bounds in jfs_readdir
2024/04/14 02:33 linux-5.15.y fa3df276cd36 c8349e48 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 UBSAN: array-index-out-of-bounds in jfs_readdir
2024/04/14 02:33 linux-5.15.y fa3df276cd36 c8349e48 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 UBSAN: array-index-out-of-bounds in jfs_readdir
2024/04/03 02:49 linux-5.15.y 9465fef4ae35 7925100d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 UBSAN: array-index-out-of-bounds in jfs_readdir
2024/04/02 22:44 linux-5.15.y 9465fef4ae35 eb2966c4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 UBSAN: array-index-out-of-bounds in jfs_readdir
2024/04/02 21:14 linux-5.15.y 9465fef4ae35 eb2966c4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 UBSAN: array-index-out-of-bounds in jfs_readdir
2024/04/02 14:34 linux-5.15.y 9465fef4ae35 eb2966c4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 UBSAN: array-index-out-of-bounds in jfs_readdir
2024/04/02 14:34 linux-5.15.y 9465fef4ae35 eb2966c4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 UBSAN: array-index-out-of-bounds in jfs_readdir
2024/04/01 20:51 linux-5.15.y 9465fef4ae35 6baf5069 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 UBSAN: array-index-out-of-bounds in jfs_readdir
2024/04/01 15:45 linux-5.15.y 9465fef4ae35 6baf5069 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 UBSAN: array-index-out-of-bounds in jfs_readdir
2024/04/01 15:18 linux-5.15.y 9465fef4ae35 6baf5069 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 UBSAN: array-index-out-of-bounds in jfs_readdir
2024/04/01 00:51 linux-5.15.y 9465fef4ae35 6baf5069 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 UBSAN: array-index-out-of-bounds in jfs_readdir
2024/04/01 00:19 linux-5.15.y 9465fef4ae35 6baf5069 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 UBSAN: array-index-out-of-bounds in jfs_readdir
* Struck through repros no longer work on HEAD.