syzbot


UBSAN: array-index-out-of-bounds in xtTruncate

Status: upstream: reported on 2022/11/14 03:34
Reported-by: syzbot+75c177aa1291e7fe423d@syzkaller.appspotmail.com
First crash: 16d, last: 7d17h

Sample crash report:
================================================================================
UBSAN: array-index-out-of-bounds in fs/jfs/jfs_xtree.c:2304:9
index 19 is out of range for type 'xad_t [18]'
CPU: 1 PID: 13985 Comm: syz-executor.2 Not tainted 6.1.0-rc5-syzkaller-00241-gab290eaddc4c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
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_out_of_bounds+0xdb/0x130 lib/ubsan.c:283
 xtTruncate+0x2778/0x32d0 fs/jfs/jfs_xtree.c:2304
 jfs_truncate_nolock+0x192/0x390 fs/jfs/inode.c:393
 jfs_truncate+0xc6/0x140 fs/jfs/inode.c:417
 jfs_direct_IO+0x1b0/0x1e0 fs/jfs/inode.c:347
 generic_file_direct_write+0x294/0x610 mm/filemap.c:3677
 __generic_file_write_iter+0x1c4/0x400 mm/filemap.c:3837
 generic_file_write_iter+0xab/0x310 mm/filemap.c:3913
 do_iter_write+0x6c2/0xc20 fs/read_write.c:861
 iter_file_splice_write+0x7fc/0xfc0 fs/splice.c:686
 do_splice_from fs/splice.c:764 [inline]
 direct_splice_actor+0xe6/0x1c0 fs/splice.c:931
 splice_direct_to_actor+0x4e4/0xc00 fs/splice.c:886
 do_splice_direct+0x279/0x3d0 fs/splice.c:974
 do_sendfile+0x5fb/0xf80 fs/read_write.c:1255
 __do_sys_sendfile64 fs/read_write.c:1323 [inline]
 __se_sys_sendfile64+0x14f/0x1b0 fs/read_write.c:1309
 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: 0033:0x7f0d61e8b639
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:00007f0d62c9c168 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f0d61fabf80 RCX: 00007f0d61e8b639
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000003
RBP: 00007f0d61ee6ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 000080001d00c0d0 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fffac5015cf R14: 00007f0d62c9c300 R15: 0000000000022000
 </TASK>
================================================================================

Crashes (2):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci2-upstream-fs 2022/11/19 09:14 upstream ab290eaddc4c 5bb70014 .config log report info UBSAN: array-index-out-of-bounds in xtTruncate
ci2-upstream-fs 2022/11/10 03:26 upstream f67dd6ce0723 b2488a87 .config log report info UBSAN: array-index-out-of-bounds in xtTruncate
* Struck through repros no longer work on HEAD.