* [syzbot] [jfs?] UBSAN: array-index-out-of-bounds in dtDelete
@ 2025-03-18 19:54 syzbot
2025-04-18 3:25 ` [syzbot] " syzbot
` (2 more replies)
0 siblings, 3 replies; 6+ messages in thread
From: syzbot @ 2025-03-18 19:54 UTC (permalink / raw)
To: jfs-discussion, linux-kernel, shaggy, syzkaller-bugs
Hello,
syzbot found the following issue on:
HEAD commit: e3a854b577cb Merge tag 'clk-fixes-for-linus' of git://git...
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=111b1fa8580000
kernel config: https://syzkaller.appspot.com/x/.config?x=eb44f62cb82f8a0a
dashboard link: https://syzkaller.appspot.com/bug?extid=4f9c823a6f63d87491ba
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1484dc78580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=151b1fa8580000
Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-e3a854b5.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/80a4e52e75a6/vmlinux-e3a854b5.xz
kernel image: https://storage.googleapis.com/syzbot-assets/e261756ed740/bzImage-e3a854b5.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/7fd9c181a987/mount_0.gz
fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=135a419b980000)
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+4f9c823a6f63d87491ba@syzkaller.appspotmail.com
loop0: detected capacity change from 0 to 32768
------------[ cut here ]------------
UBSAN: array-index-out-of-bounds in fs/jfs/jfs_dtree.c:2132:32
index 240 is out of range for type 'struct dtslot[128]'
CPU: 0 UID: 0 PID: 5303 Comm: syz-executor483 Not tainted 6.14.0-rc6-syzkaller-00115-ge3a854b577cb #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
ubsan_epilogue lib/ubsan.c:231 [inline]
__ubsan_handle_out_of_bounds+0x121/0x150 lib/ubsan.c:429
dtDelete+0x2d67/0x2db0 fs/jfs/jfs_dtree.c:2132
jfs_rename+0xf91/0x1bf0 fs/jfs/namei.c:1239
vfs_rename+0xbdb/0xf00 fs/namei.c:5069
do_renameat2+0xd94/0x13f0 fs/namei.c:5226
__do_sys_rename fs/namei.c:5273 [inline]
__se_sys_rename fs/namei.c:5271 [inline]
__x64_sys_rename+0x82/0x90 fs/namei.c:5271
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc873bc9bb9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 61 17 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff24dc46e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000052
RAX: ffffffffffffffda RBX: 0000400000000e00 RCX: 00007fc873bc9bb9
RDX: 00007fc873bc9bb9 RSI: 0000400000000f40 RDI: 0000400000000300
RBP: 00007fc873c42610 R08: 00007fff24dc48b8 R09: 00007fff24dc48b8
R10: 00007fff24dc48b8 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fff24dc48a8 R14: 0000000000000001 R15: 0000000000000001
</TASK>
---[ end trace ]---
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
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syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
If you want to overwrite report's subsystems, reply with:
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(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
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If you want to undo deduplication, reply with:
#syz undup
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [syzbot] Re: [syzbot] [jfs?] UBSAN: array-index-out-of-bounds in dtDelete
2025-03-18 19:54 [syzbot] [jfs?] UBSAN: array-index-out-of-bounds in dtDelete syzbot
@ 2025-04-18 3:25 ` syzbot
2025-09-18 21:04 ` [PATCH] jfs: Add check for array bounds " Pedro Demarchi Gomes
2025-09-19 15:23 ` Forwarded: " syzbot
2 siblings, 0 replies; 6+ messages in thread
From: syzbot @ 2025-04-18 3:25 UTC (permalink / raw)
To: linux-kernel
For archival purposes, forwarding an incoming command email to
linux-kernel@vger.kernel.org.
***
Subject: Re: [syzbot] [jfs?] UBSAN: array-index-out-of-bounds in dtDelete
Author: richard120310@gmail.com
#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git e3a854b577cb
Signed-off-by: I Hsin Cheng <richard120310@gmail.com>
---
fs/jfs/jfs_dtree.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/jfs/jfs_dtree.c b/fs/jfs/jfs_dtree.c
index 8f85177f284b..0a209b30686a 100644
--- a/fs/jfs/jfs_dtree.c
+++ b/fs/jfs/jfs_dtree.c
@@ -2130,7 +2130,7 @@ int dtDelete(tid_t tid,
stbl = DT_GETSTBL(np);
ldtentry =
(struct ldtentry *) & np->
- slot[stbl[0]];
+ slot[stbl[0] % np->header.maxslot];
next_index =
le32_to_cpu(ldtentry->index);
DT_PUTPAGE(nmp);
--
2.43.0
^ permalink raw reply [flat|nested] 6+ messages in thread
* [PATCH] jfs: Add check for array bounds in dtDelete
2025-03-18 19:54 [syzbot] [jfs?] UBSAN: array-index-out-of-bounds in dtDelete syzbot
2025-04-18 3:25 ` [syzbot] " syzbot
@ 2025-09-18 21:04 ` Pedro Demarchi Gomes
2025-09-18 21:27 ` [syzbot] [jfs?] UBSAN: array-index-out-of-bounds " syzbot
2025-09-19 15:23 ` Forwarded: " syzbot
2 siblings, 1 reply; 6+ messages in thread
From: Pedro Demarchi Gomes @ 2025-09-18 21:04 UTC (permalink / raw)
To: syzbot+4f9c823a6f63d87491ba
Cc: jfs-discussion, linux-kernel, shaggy, syzkaller-bugs,
Pedro Demarchi Gomes
#syz test
---
fs/jfs/jfs_dtree.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/fs/jfs/jfs_dtree.c b/fs/jfs/jfs_dtree.c
index ab11849cf9cc..b30f57304c09 100644
--- a/fs/jfs/jfs_dtree.c
+++ b/fs/jfs/jfs_dtree.c
@@ -2129,6 +2129,14 @@ int dtDelete(tid_t tid,
next_index = -1;
else {
stbl = DT_GETSTBL(np);
+ if (stbl[0] < 0 || stbl[0] >= DTPAGEMAXSLOT) {
+ jfs_err("JFS: Invalid stbl[0] = %d for inode %ld, block = %lld",
+ stbl[0], (long)ip->i_ino, (long long)le64_to_cpu(p->header.next));
+ DT_PUTPAGE(nmp);
+ DT_PUTPAGE(mp);
+ return -EIO;
+ }
+
ldtentry =
(struct ldtentry *) & np->
slot[stbl[0]];
--
2.39.5
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [syzbot] [jfs?] UBSAN: array-index-out-of-bounds in dtDelete
2025-09-18 21:04 ` [PATCH] jfs: Add check for array bounds " Pedro Demarchi Gomes
@ 2025-09-18 21:27 ` syzbot
0 siblings, 0 replies; 6+ messages in thread
From: syzbot @ 2025-09-18 21:27 UTC (permalink / raw)
To: jfs-discussion, linux-kernel, pedrodemargomes, shaggy, syzkaller-bugs
Hello,
syzbot has tested the proposed patch but the reproducer is still triggering an issue:
kernel BUG in jfs_evict_inode
------------[ cut here ]------------
kernel BUG at fs/jfs/inode.c:169!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5829 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:jfs_evict_inode+0x438/0x440 fs/jfs/inode.c:169
Code: fe e9 e0 fd ff ff 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c 23 fe ff ff 4c 89 f7 e8 53 32 e8 fe e9 16 fe ff ff e8 a9 30 83 fe 90 <0f> 0b 66 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc9000294fae0 EFLAGS: 00010293
RAX: ffffffff833c7ea7 RBX: ffff888040f50430 RCX: ffff888000b00000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff888040f50430
RBP: 0000000000000001 R08: ffffffff8fa1dc37 R09: 1ffffffff1f43b86
R10: dffffc0000000000 R11: ffffffff833c5ba0 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffff888040f500b8 R15: ffffffff833c7a70
FS: 0000555570297500(0000) GS:ffff88808d261000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd8d810d68 CR3: 00000000594b6000 CR4: 0000000000352ef0
Call Trace:
<TASK>
evict+0x504/0x9c0 fs/inode.c:810
dispose_list fs/inode.c:852 [inline]
evict_inodes+0x64c/0x6d0 fs/inode.c:906
generic_shutdown_super+0x9a/0x2c0 fs/super.c:628
kill_block_super+0x44/0x90 fs/super.c:1766
deactivate_locked_super+0xb9/0x130 fs/super.c:474
cleanup_mnt+0x425/0x4c0 fs/namespace.c:1375
task_work_run+0x1d1/0x260 kernel/task_work.c:227
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop+0xec/0x110 kernel/entry/common.c:43
exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd644f8e497
Code: a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffd8d811518 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007fd64500e08c RCX: 00007fd644f8e497
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffd8d8115d0
RBP: 00007ffd8d8115d0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffd8d812660
R13: 00007fd64500e08c R14: 0000000000023de4 R15: 00007ffd8d8126a0
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:jfs_evict_inode+0x438/0x440 fs/jfs/inode.c:169
Code: fe e9 e0 fd ff ff 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c 23 fe ff ff 4c 89 f7 e8 53 32 e8 fe e9 16 fe ff ff e8 a9 30 83 fe 90 <0f> 0b 66 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc9000294fae0 EFLAGS: 00010293
RAX: ffffffff833c7ea7 RBX: ffff888040f50430 RCX: ffff888000b00000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff888040f50430
RBP: 0000000000000001 R08: ffffffff8fa1dc37 R09: 1ffffffff1f43b86
R10: dffffc0000000000 R11: ffffffff833c5ba0 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffff888040f500b8 R15: ffffffff833c7a70
FS: 0000555570297500(0000) GS:ffff88808d261000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c009bee020 CR3: 00000000594b6000 CR4: 0000000000352ef0
Tested on:
commit: cbf658dd Merge tag 'net-6.17-rc7' of git://git.kernel...
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1261cf62580000
kernel config: https://syzkaller.appspot.com/x/.config?x=839dff357af8f40d
dashboard link: https://syzkaller.appspot.com/bug?extid=4f9c823a6f63d87491ba
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
patch: https://syzkaller.appspot.com/x/patch.diff?x=11123f62580000
^ permalink raw reply [flat|nested] 6+ messages in thread
* Forwarded: Re: [syzbot] [jfs?] UBSAN: array-index-out-of-bounds in dtDelete
2025-03-18 19:54 [syzbot] [jfs?] UBSAN: array-index-out-of-bounds in dtDelete syzbot
2025-04-18 3:25 ` [syzbot] " syzbot
2025-09-18 21:04 ` [PATCH] jfs: Add check for array bounds " Pedro Demarchi Gomes
@ 2025-09-19 15:23 ` syzbot
2 siblings, 0 replies; 6+ messages in thread
From: syzbot @ 2025-09-19 15:23 UTC (permalink / raw)
To: linux-kernel
For archival purposes, forwarding an incoming command email to
linux-kernel@vger.kernel.org.
***
Subject: Re: [syzbot] [jfs?] UBSAN: array-index-out-of-bounds in dtDelete
Author: pedrodemargomes@gmail.com
#syz test
---
fs/jfs/jfs_dtree.c | 16 +++++++++++-----
1 file changed, 11 insertions(+), 5 deletions(-)
diff --git a/fs/jfs/jfs_dtree.c b/fs/jfs/jfs_dtree.c
index ab11849cf9cc..c200b37f4562 100644
--- a/fs/jfs/jfs_dtree.c
+++ b/fs/jfs/jfs_dtree.c
@@ -2129,11 +2129,17 @@ int dtDelete(tid_t tid,
next_index = -1;
else {
stbl = DT_GETSTBL(np);
- ldtentry =
- (struct ldtentry *) & np->
- slot[stbl[0]];
- next_index =
- le32_to_cpu(ldtentry->index);
+ if (stbl[0] < 0 || stbl[0] >= DTPAGEMAXSLOT) {
+ jfs_err("JFS: Invalid stbl[0] = %d for inode %ld, block = %lld",
+ stbl[0], (long)ip->i_ino, (long long)le64_to_cpu(p->header.next));
+ next_index = -1;
+ } else {
+ ldtentry =
+ (struct ldtentry *) & np->
+ slot[stbl[0]];
+ next_index =
+ le32_to_cpu(ldtentry->index);
+ }
DT_PUTPAGE(nmp);
}
}
--
2.43.0
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^ permalink raw reply [flat|nested] 6+ messages in thread
* [PATCH] jfs: Add check for array bounds in dtDelete
@ 2025-09-19 22:50 Pedro Demarchi Gomes
0 siblings, 0 replies; 6+ messages in thread
From: Pedro Demarchi Gomes @ 2025-09-19 22:50 UTC (permalink / raw)
To: shaggy, duttaditya18, ghanshyam1898
Cc: jfs-discussion, linux-kernel, Pedro Demarchi Gomes,
syzbot+4f9c823a6f63d87491ba
stbl is s8 but it must contain offsets into slot which can go from 0 to
127.
Add a bound check for that error inside dtDelete function.
Reported-by: syzbot+4f9c823a6f63d87491ba@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=4f9c823a6f63d87491ba
Signed-off-by: Pedro Demarchi Gomes <pedrodemargomes@gmail.com>
---
fs/jfs/jfs_dtree.c | 16 +++++++++++-----
1 file changed, 11 insertions(+), 5 deletions(-)
diff --git a/fs/jfs/jfs_dtree.c b/fs/jfs/jfs_dtree.c
index ab11849cf9cc..c200b37f4562 100644
--- a/fs/jfs/jfs_dtree.c
+++ b/fs/jfs/jfs_dtree.c
@@ -2129,11 +2129,17 @@ int dtDelete(tid_t tid,
next_index = -1;
else {
stbl = DT_GETSTBL(np);
- ldtentry =
- (struct ldtentry *) & np->
- slot[stbl[0]];
- next_index =
- le32_to_cpu(ldtentry->index);
+ if (stbl[0] < 0 || stbl[0] >= DTPAGEMAXSLOT) {
+ jfs_err("JFS: Invalid stbl[0] = %d for inode %ld, block = %lld",
+ stbl[0], (long)ip->i_ino, (long long)le64_to_cpu(p->header.next));
+ next_index = -1;
+ } else {
+ ldtentry =
+ (struct ldtentry *) & np->
+ slot[stbl[0]];
+ next_index =
+ le32_to_cpu(ldtentry->index);
+ }
DT_PUTPAGE(nmp);
}
}
--
2.39.5
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2025-09-19 22:57 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2025-03-18 19:54 [syzbot] [jfs?] UBSAN: array-index-out-of-bounds in dtDelete syzbot
2025-04-18 3:25 ` [syzbot] " syzbot
2025-09-18 21:04 ` [PATCH] jfs: Add check for array bounds " Pedro Demarchi Gomes
2025-09-18 21:27 ` [syzbot] [jfs?] UBSAN: array-index-out-of-bounds " syzbot
2025-09-19 15:23 ` Forwarded: " syzbot
2025-09-19 22:50 [PATCH] jfs: Add check for array bounds " Pedro Demarchi Gomes
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