syzbot


UBSAN: shift-out-of-bounds in diAllocBit

Status: upstream: reported on 2022/10/24 07:04
Reported-by: syzbot+cfb3836ee00e264151bc@syzkaller.appspotmail.com
First crash: 33d, last: 33d

Sample crash report:
UBSAN: shift-out-of-bounds in fs/jfs/jfs_imap.c:2039:9
shift exponent 3328 is too large for 64-bit type '__u64' (aka 'unsigned long long')
CPU: 0 PID: 19191 Comm: syz-executor.2 Not tainted 6.1.0-rc1-syzkaller-00427-gd47136c28015 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1b1/0x28e lib/dump_stack.c:106
 ubsan_epilogue lib/ubsan.c:151 [inline]
 __ubsan_handle_shift_out_of_bounds+0x33d/0x3b0 lib/ubsan.c:322
 diAllocBit+0x9d7/0xd30 fs/jfs/jfs_imap.c:2039
 diAllocIno fs/jfs/jfs_imap.c:1837 [inline]
 diAllocAG+0x1418/0x1f80 fs/jfs/jfs_imap.c:1669
 diAlloc+0x3dd/0x1700 fs/jfs/jfs_imap.c:1583
 ialloc+0x8c/0xa80 fs/jfs/jfs_inode.c:56
 jfs_mkdir+0x141/0xb00 fs/jfs/namei.c:225
 vfs_mkdir+0x3b3/0x590 fs/namei.c:4035
 do_mkdirat+0x279/0x550 fs/namei.c:4060
 __do_sys_mkdir fs/namei.c:4080 [inline]
 __se_sys_mkdir fs/namei.c:4078 [inline]
 __x64_sys_mkdir+0x6a/0x80 fs/namei.c:4078
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f7246c8b5f9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f7247dad168 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 00007f7246dac050 RCX: 00007f7246c8b5f9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020007040
RBP: 00007f7246ce67b0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc5fe2b60f R14: 00007f7247dad300 R15: 0000000000022000
 </TASK>
================================================================================

Crashes (1):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci2-upstream-fs 2022/10/24 05:05 upstream d47136c28015 23bf86af .config log report info UBSAN: shift-out-of-bounds in diAllocBit
* Struck through repros no longer work on HEAD.