memfd_create() without MFD_EXEC nor MFD_NOEXEC_SEAL, pid=5020 'syz-executor219' 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: 5020 Comm: syz-executor219 Not tainted 6.5.0-rc6-syzkaller-00253-g9e6c269de404 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x125/0x1b0 lib/dump_stack.c:106 ubsan_epilogue lib/ubsan.c:217 [inline] __ubsan_handle_shift_out_of_bounds+0x27a/0x600 lib/ubsan.c:387 befs_check_sb.cold+0x19/0x6f fs/befs/super.c:96 befs_fill_super+0x9e6/0x1140 fs/befs/linuxvfs.c:873 mount_bdev+0x30d/0x3d0 fs/super.c:1391 legacy_get_tree+0x109/0x220 fs/fs_context.c:611 vfs_get_tree+0x88/0x350 fs/super.c:1519 do_new_mount fs/namespace.c:3335 [inline] path_mount+0x1492/0x1ed0 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+0x293/0x310 fs/namespace.c:3861 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f5635d3e8ba 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:00007ffd321ef8c8 EFLAGS: 00000282 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007ffd321ef8d0 RCX: 00007f5635d3e8ba RDX: 0000000020000100 RSI: 0000000020009e40 RDI: 00007ffd321ef8d0 RBP: 0000000000000004 R08: 00007ffd321ef910 R09: 0000000000009e1f R10: 0000000003008001 R11: 0000000000000282 R12: 00007ffd321ef910 R13: 0000000000000003 R14: 0000000000010000 R15: 0000000000000001 ================================================================================