syzbot


UBSAN: shift-out-of-bounds in diNewExt

Status: upstream: reported C repro on 2022/10/04 08:49
Reported-by: syzbot+e7c25a1325c6112704be@syzkaller.appspotmail.com
First crash: 54d, last: 12d

Cause bisection: failed (bisect log)
Patch testing requests:
Created Duration User Patch Repo Result
2022/10/04 10:45 17m mudongliangabcd@gmail.com patch git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git -- error

Sample crash report:
loop0: detected capacity change from 0 to 32768
================================================================================
UBSAN: shift-out-of-bounds in fs/jfs/jfs_imap.c:2177:9
shift exponent 3328 is too large for 64-bit type 'long long unsigned int'
CPU: 1 PID: 3603 Comm: syz-executor662 Not tainted 6.0.0-syzkaller-09039-ga6afa4199d3d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 ubsan_epilogue+0xb/0x50 lib/ubsan.c:151
 __ubsan_handle_shift_out_of_bounds.cold+0xb1/0x187 lib/ubsan.c:322
 diNewExt.cold+0x18/0x75 fs/jfs/jfs_imap.c:2177
 diAllocExt fs/jfs/jfs_imap.c:1945 [inline]
 diAllocAG+0x15f1/0x2200 fs/jfs/jfs_imap.c:1662
 diAlloc+0x82d/0x1730 fs/jfs/jfs_imap.c:1583
 ialloc+0x89/0xaa0 fs/jfs/jfs_inode.c:56
 jfs_mkdir+0x1f0/0xab0 fs/jfs/namei.c:225
 vfs_mkdir+0x489/0x740 fs/namei.c:4013
 do_mkdirat+0x28c/0x310 fs/namei.c:4038
 __do_sys_mkdirat fs/namei.c:4053 [inline]
 __se_sys_mkdirat fs/namei.c:4051 [inline]
 __x64_sys_mkdirat+0x115/0x170 fs/namei.c:4051
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f13625c8009
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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff1477d8b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f13625c8009
RDX: 0000000000000000 RSI: 0000000020000540 RDI: 0000000000000003
RBP: 00007f13625877d0 R08: 0000000000000000 R09: 00007f13625877d0
R10: 000000000000002e R11: 0000000000000246 R12: 00000000f8008000
R13: 0000000000000000 R14: 00080000000000f8 R15: 0000000000000000
 </TASK>
================================================================================

Fix bisection attempts:
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci2-upstream-fs 2022/11/14 12:44 upstream 094226ad94f4 feb56351 .config log report syz C
* Struck through repros no longer work on HEAD.
Crashes (3):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce-root 2022/10/09 12:56 upstream a6afa4199d3d aea5da89 .config log report syz C UBSAN: shift-out-of-bounds in diNewExt
ci2-upstream-fs 2022/10/03 16:57 upstream 4fe89d07dcc2 feb56351 .config log report syz C UBSAN: shift-out-of-bounds in diNewExt
ci2-upstream-fs 2022/10/15 07:00 upstream 493ffd6605b2 67cb024c .config log report info UBSAN: shift-out-of-bounds in diNewExt
* Struck through repros no longer work on HEAD.