syzbot


UBSAN: shift-out-of-bounds in init_sb

Status: auto-closed as invalid on 2022/03/06 03:30
Reported-by: syzbot+a498b19f2d8b0d716088@syzkaller.appspotmail.com
First crash: 520d, last: 390d
similar bugs (2):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream UBSAN: shift-out-of-bounds in init_sb (2) 1 236d 232d 0/24 auto-closed as invalid on 2022/06/07 15:31
upstream UBSAN: shift-out-of-bounds in init_sb (3) C 40 44d 109d 23/24 upstream: reported C repro on 2022/08/13 20:54

Sample crash report:
gfs2: fsid=syz:syz: Now mounting FS (format 1801)...
================================================================================
UBSAN: shift-out-of-bounds in fs/gfs2/ops_fstype.c:299:19
shift exponent 100663299 is too large for 64-bit type 'long unsigned int'
CPU: 1 PID: 30834 Comm: syz-executor.4 Not tainted 5.13.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x141/0x1d7 lib/dump_stack.c:120
 ubsan_epilogue+0xb/0x5a lib/ubsan.c:148
 __ubsan_handle_shift_out_of_bounds.cold+0xb1/0x181 lib/ubsan.c:327
 gfs2_read_sb fs/gfs2/ops_fstype.c:299 [inline]
 init_sb.cold+0x19/0x109 fs/gfs2/ops_fstype.c:489
 gfs2_fill_super+0x18a6/0x2680 fs/gfs2/ops_fstype.c:1171
 get_tree_bdev+0x440/0x760 fs/super.c:1293
 gfs2_get_tree+0x4a/0x270 fs/gfs2/ops_fstype.c:1273
 vfs_get_tree+0x89/0x2f0 fs/super.c:1498
 do_new_mount fs/namespace.c:2905 [inline]
 path_mount+0x132a/0x1fa0 fs/namespace.c:3235
 do_mount fs/namespace.c:3248 [inline]
 __do_sys_mount fs/namespace.c:3456 [inline]
 __se_sys_mount fs/namespace.c:3433 [inline]
 __x64_sys_mount+0x27f/0x300 fs/namespace.c:3433
 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x467afa
Code: 48 c7 c2 bc ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd3a69ebfa8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 0000000000467afa
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007fd3a69ec000
RBP: 00007fd3a69ec040 R08: 00007fd3a69ec040 R09: 0000000020000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000000
R13: 0000000020000100 R14: 00007fd3a69ec000 R15: 0000000020047a20
================================================================================

Crashes (4):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce-selinux-root 2021/06/28 15:39 upstream 62fb9874f5da 9d2ab5df .config log report info UBSAN: shift-out-of-bounds in init_sb
ci-upstream-linux-next-kasan-gce-root 2021/11/06 03:29 linux-next 6a37ebbe07bf 4c1be0be .config log report info UBSAN: shift-out-of-bounds in init_sb
ci-upstream-linux-next-kasan-gce-root 2021/07/28 21:23 linux-next 42d0b5f52c9b 9a4781d4 .config log report info UBSAN: shift-out-of-bounds in init_sb
ci-upstream-linux-next-kasan-gce-root 2021/07/06 22:09 linux-next d72e63193059 cca78469 .config log report info UBSAN: shift-out-of-bounds in init_sb
* Struck through repros no longer work on HEAD.