linux-kernel - [syzbot] [ext4?] WARNING in __ext4

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Date: Mon, 24 Jun 2024 01:10:20 -0700
From: syzbot <syzbot+2cab87506a0e7885f4b9@...kaller.appspotmail.com>
To: adilger.kernel@...ger.ca, linux-ext4@...r.kernel.org, 
	linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com, tytso@....edu
Subject: [syzbot] [ext4?] WARNING in __ext4_ioctl

Hello,

syzbot found the following issue on:

HEAD commit:    7c16f0a4ed1c Merge tag 'i2c-for-6.10-rc5' of git://git.ker..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10e04151980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=3d112b9ab538ebab
dashboard link: https://syzkaller.appspot.com/bug?extid=2cab87506a0e7885f4b9
compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/b29845d4c0ce/disk-7c16f0a4.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/e39e5d18a392/vmlinux-7c16f0a4.xz
kernel image: https://storage.googleapis.com/syzbot-assets/f6ac8c44d142/bzImage-7c16f0a4.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+2cab87506a0e7885f4b9@...kaller.appspotmail.com

------------[ cut here ]------------
strnlen: detected buffer overflow: 17 byte read of buffer size 16
WARNING: CPU: 1 PID: 19420 at lib/string_helpers.c:1029 __fortify_report+0x9c/0xd0 lib/string_helpers.c:1029
Modules linked in:
CPU: 1 PID: 19420 Comm: syz-executor.1 Not tainted 6.10.0-rc4-syzkaller-00330-g7c16f0a4ed1c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
RIP: 0010:__fortify_report+0x9c/0xd0 lib/string_helpers.c:1029
Code: ed 48 c7 c0 20 c9 8f 8b 48 0f 44 d8 e8 8d 53 0b fd 4d 89 e0 48 89 ea 48 89 d9 4c 89 f6 48 c7 c7 a0 c9 8f 8b e8 e5 6e cd fc 90 <0f> 0b 90 90 5b 5d 41 5c 41 5d 41 5e e9 3e 67 8c 06 48 89 de 48 c7
RSP: 0018:ffffc90004c2fbf0 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffffffff8b8fc920 RCX: ffffc9000bb9b000
RDX: 0000000000040000 RSI: ffffffff81514a46 RDI: 0000000000000001
RBP: 0000000000000011 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000010
R13: 0000000000000000 R14: ffffffff8b8fd2e0 R15: ffff88802bb42060
FS:  00007f6eba6e46c0(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff2d1cbc28 CR3: 0000000062552000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 __fortify_panic+0x23/0x30 lib/string_helpers.c:1036
 strnlen include/linux/fortify-string.h:235 [inline]
 sized_strscpy include/linux/fortify-string.h:309 [inline]
 ext4_ioctl_getlabel fs/ext4/ioctl.c:1154 [inline]
 __ext4_ioctl+0x404d/0x4580 fs/ext4/ioctl.c:1609
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl fs/ioctl.c:893 [inline]
 __x64_sys_ioctl+0x196/0x220 fs/ioctl.c:893
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6eb987d0a9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f6eba6e40c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f6eb99b3f80 RCX: 00007f6eb987d0a9
RDX: 0000000020000100 RSI: 0000000081009431 RDI: 0000000000000003
RBP: 00007f6eb98ec074 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f6eb99b3f80 R15: 00007ffcd312f958
 </TASK>


---
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