Hello,
syzbot found the following issue on:
HEAD commit: abddfcf701a5 Linux 5.15.99
git tree: linux-5.15.y
console output:
https://syzkaller.appspot.com/x/log.txt?x=15d2ec62c80000
kernel config:
https://syzkaller.appspot.com/x/.config?x=53e47369740caba3
dashboard link:
https://syzkaller.appspot.com/bug?extid=b8b855c6ce6c30ad0ad2
compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2
userspace arch: arm64
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image:
https://storage.googleapis.com/syzbot-assets/78c522505d54/disk-abddfcf7.raw.xz
vmlinux:
https://storage.googleapis.com/syzbot-assets/caca388168a7/vmlinux-abddfcf7.xz
kernel image:
https://storage.googleapis.com/syzbot-assets/e6db198604be/Image-abddfcf7.gz.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by:
syzbot+b8b855...@syzkaller.appspotmail.com
================================================================================
UBSAN: shift-out-of-bounds in fs/ext2/super.c:950:25
shift exponent 64 is too large for 32-bit type 'int'
CPU: 0 PID: 10078 Comm: syz-executor.5 Not tainted 5.15.99-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
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_shift_out_of_bounds+0x2f8/0x378 lib/ubsan.c:321
ext2_fill_super+0x2124/0x2390 fs/ext2/super.c:950
mount_bdev+0x26c/0x368 fs/super.c:1369
ext2_mount+0x44/0x58 fs/ext2/super.c:1473
legacy_get_tree+0xd4/0x16c fs/fs_context.c:610
vfs_get_tree+0x90/0x274 fs/super.c:1499
do_new_mount+0x25c/0x8c8 fs/namespace.c:2994
path_mount+0x590/0x104c fs/namespace.c:3324
do_mount fs/namespace.c:3337 [inline]
__do_sys_mount fs/namespace.c:3545 [inline]
__se_sys_mount fs/namespace.c:3522 [inline]
__arm64_sys_mount+0x510/0x5e0 fs/namespace.c:3522
__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:596
el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:614
el0t_64_sync+0x1a0/0x1a4 <unknown>:584
================================================================================
EXT2-fs (loop5): error: fragsize 4096 != blocksize 1024(not supported yet)
---
This report is generated by a bot. It may contain errors.
See
https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at
syzk...@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.