Hello, syzbot found the following issue on: HEAD commit: 3f01e9fed845 Merge tag 'linux-watchdog-6.5-rc2' of git://w.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=1310fc5ca80000 kernel config: https://syzkaller.appspot.com/x/.config?x=e6c2f785de9e303f dashboard link: https://syzkaller.appspot.com/bug?extid=fc26c366038b54261e53 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=107f12e8a80000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=174014a2a80000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/896ca272ae74/disk-3f01e9fe.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/deff7fbe3b2c/vmlinux-3f01e9fe.xz kernel image: https://storage.googleapis.com/syzbot-assets/ca3863031cc5/bzImage-3f01e9fe.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/9c7c5305480d/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+fc26c366038b54261e53@xxxxxxxxxxxxxxxxxxxxxxxxx memfd_create() without MFD_EXEC nor MFD_NOEXEC_SEAL, pid=5019 'syz-executor590' loop0: detected capacity change from 0 to 128 ================================================================================ UBSAN: shift-out-of-bounds in fs/befs/super.c:96:9 shift exponent 3229888891 is too large for 32-bit type 'int' CPU: 0 PID: 5019 Comm: syz-executor590 Not tainted 6.5.0-rc1-syzkaller-00006-g3f01e9fed845 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/03/2023 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x136/0x150 lib/dump_stack.c:106 ubsan_epilogue lib/ubsan.c:217 [inline] __ubsan_handle_shift_out_of_bounds+0x221/0x5a0 lib/ubsan.c:387 befs_check_sb.cold+0x19/0x6f fs/befs/super.c:96 befs_fill_super+0x9b5/0x1110 fs/befs/linuxvfs.c:873 mount_bdev+0x315/0x3e0 fs/super.c:1391 legacy_get_tree+0x109/0x220 fs/fs_context.c:611 vfs_get_tree+0x8d/0x350 fs/super.c:1519 do_new_mount fs/namespace.c:3335 [inline] path_mount+0x136e/0x1e70 fs/namespace.c:3662 do_mount fs/namespace.c:3675 [inline] __do_sys_mount fs/namespace.c:3884 [inline] __se_sys_mount fs/namespace.c:3861 [inline] __x64_sys_mount+0x283/0x300 fs/namespace.c:3861 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fe1b84908ba Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 5e 04 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 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:00007ffd994dbc28 EFLAGS: 00000282 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007ffd994dbc30 RCX: 00007fe1b84908ba RDX: 0000000020000100 RSI: 0000000020009e40 RDI: 00007ffd994dbc30 RBP: 0000000000000004 R08: 00007ffd994dbc70 R09: 0000000000009e1f R10: 0000000003008001 R11: 0000000000000282 R12: 00007ffd994dbc70 R13: 0000000000000003 R14: 0000000000010000 R15: 0000000000000001 </TASK> ================================================================================ --- 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 syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the bug is already fixed, 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 change bug's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the bug is a duplicate of another bug, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
