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

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Date: Wed, 22 May 2024 23:29:25 -0700
From: syzbot <syzbot+50835f73143cc2905b9e@...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 __fortify_report

Hello,

syzbot found the following issue on:

HEAD commit:    0450d2083be6 Merge tag '6.10-rc-smb-fix' of git://git.samb..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=152aa7d0980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=769d2e801ee872cc
dashboard link: https://syzkaller.appspot.com/bug?extid=50835f73143cc2905b9e
compiler:       arm-linux-gnueabi-gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: arm
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=103cb2a4980000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16502844980000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/8ead8862021c/non_bootable_disk-0450d208.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/11a51fed42ca/vmlinux-0450d208.xz
kernel image: https://storage.googleapis.com/syzbot-assets/1df7cb920c72/zImage-0450d208.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+50835f73143cc2905b9e@...kaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 0 PID: 3004 at lib/string_helpers.c:1029 __fortify_report+0x6c/0x74 lib/string_helpers.c:1029
strnlen: detected buffer overflow: 17 byte read of buffer size 16
Modules linked in:
Kernel panic - not syncing: kernel: panic_on_warn set ...
CPU: 0 PID: 3004 Comm: syz-executor296 Not tainted 6.9.0-syzkaller #0
Hardware name: ARM-Versatile Express
Call trace: 
[<818df678>] (dump_backtrace) from [<818df774>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:256)
 r7:00000000 r6:82622e04 r5:00000000 r4:81fe2534
[<818df75c>] (show_stack) from [<818fcdd8>] (__dump_stack lib/dump_stack.c:88 [inline])
[<818df75c>] (show_stack) from [<818fcdd8>] (dump_stack_lvl+0x54/0x7c lib/dump_stack.c:114)
[<818fcd84>] (dump_stack_lvl) from [<818fce18>] (dump_stack+0x18/0x1c lib/dump_stack.c:123)
 r5:00000000 r4:82860d18
[<818fce00>] (dump_stack) from [<818e021c>] (panic+0x120/0x358 kernel/panic.c:347)
[<818e00fc>] (panic) from [<80243d54>] (check_panic_on_warn kernel/panic.c:240 [inline])
[<818e00fc>] (panic) from [<80243d54>] (print_tainted+0x0/0xa0 kernel/panic.c:235)
 r3:8260c5c4 r2:00000001 r1:81fcb130 r0:81fd2d44
 r7:8080fe7c
[<80243ce0>] (check_panic_on_warn) from [<80243f48>] (__warn+0x7c/0x180 kernel/panic.c:693)
[<80243ecc>] (__warn) from [<80244234>] (warn_slowpath_fmt+0x1e8/0x1f4 kernel/panic.c:726)
 r8:00000009 r7:8202fe0c r6:df969db4 r5:836e6c00 r4:00000000
[<80244050>] (warn_slowpath_fmt) from [<8080fe7c>] (__fortify_report+0x6c/0x74 lib/string_helpers.c:1029)
 r10:8271c1c8 r9:00000005 r8:df969ec3 r7:8372e000 r6:00000000 r5:836be478
 r4:82e27000
[<8080fe10>] (__fortify_report) from [<818e9a40>] (__fortify_panic+0x10/0x14 lib/string_helpers.c:1036)
[<818e9a30>] (__fortify_panic) from [<8062a3b0>] (strnlen include/linux/fortify-string.h:221 [inline])
[<818e9a30>] (__fortify_panic) from [<8062a3b0>] (sized_strscpy include/linux/fortify-string.h:295 [inline])
[<818e9a30>] (__fortify_panic) from [<8062a3b0>] (ext4_ioctl_getlabel fs/ext4/ioctl.c:1154 [inline])
[<818e9a30>] (__fortify_panic) from [<8062a3b0>] (ext4_fileattr_get+0x0/0x78 fs/ext4/ioctl.c:1609)
[<8062829c>] (__ext4_ioctl) from [<8062aaac>] (ext4_ioctl+0x10/0x14 fs/ext4/ioctl.c:1626)
 r10:836e6c00 r9:00000005 r8:845e7900 r7:00000000 r6:845e7900 r5:00000000
 r4:81009431
[<8062aa9c>] (ext4_ioctl) from [<80518930>] (vfs_ioctl fs/ioctl.c:51 [inline])
[<8062aa9c>] (ext4_ioctl) from [<80518930>] (do_vfs_ioctl fs/ioctl.c:861 [inline])
[<8062aa9c>] (ext4_ioctl) from [<80518930>] (__do_sys_ioctl fs/ioctl.c:905 [inline])
[<8062aa9c>] (ext4_ioctl) from [<80518930>] (sys_ioctl+0x134/0xda4 fs/ioctl.c:893)
[<805187fc>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67)
Exception stack(0xdf969fa8 to 0xdf969ff0)
9fa0:                   00000000 00000000 00000005 81009431 00000000 00000000
9fc0: 00000000 00000000 0008e060 00000036 000f4240 00000000 00000001 00003a97
9fe0: 7e98ac70 7e98ac60 00010764 0002e8c0
 r10:00000036 r9:836e6c00 r8:8020029c r7:00000036 r6:0008e060 r5:00000000
 r4:00000000
Rebooting in 86400 seconds..


---
This report is generated by a bot. It may contain errors.
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