syzbot


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

Status: upstream: reported C repro on 2023/07/04 11:41
Bug presence: origin:upstream
Labels: missing-backport
[Documentation on labels]
Reported-by: syzbot+de1c7786b6353c986da5@syzkaller.appspotmail.com
First crash: 469d, last: 469d
Fix bisection: failed (error log, bisect log)
  
Bug presence (3)
Date Name Commit Repro Result
2023/11/17 linux-5.15.y (ToT) 80529b4968a8 C [report] UBSAN: array-index-out-of-bounds in xtSearch
2023/07/05 upstream (ToT) d528014517f2 C [report] UBSAN: array-index-out-of-bounds in xtInsert
2023/11/17 upstream (ToT) 7475e51b8796 C Didn't crash
Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream UBSAN: array-index-out-of-bounds in xtLookup jfs 3 670d 709d 0/28 auto-obsoleted due to no activity on 2023/04/14 02:21
linux-6.1 UBSAN: array-index-out-of-bounds in xtLookup 1 171d 171d 0/3 auto-obsoleted due to no activity on 2024/08/05 16:26
Last patch testing requests (1)
Created Duration User Patch Repo Result
2024/10/05 21:01 24m retest repro linux-5.15.y report log
Fix bisection attempts (6)
Created Duration User Patch Repo Result
2024/05/24 20:26 2h12m fix candidate upstream OK (0) job log
2024/03/17 06:45 26m fix candidate upstream error job log
2024/02/09 20:22 19m fix candidate upstream error job log
2024/01/08 17:19 37m fix candidate upstream error job log
2023/12/08 17:20 17m fix candidate upstream error job log
2023/09/18 20:03 17m bisect fix linux-5.15.y error job log

Sample crash report:
================================================================================
UBSAN: array-index-out-of-bounds in fs/jfs/jfs_xtree.c:190:9
index 19 is out of range for type 'xad_t[18]' (aka 'struct xad[18]')
CPU: 1 PID: 4121 Comm: syz-executor408 Not tainted 5.15.119-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 ubsan_epilogue lib/ubsan.c:151 [inline]
 __ubsan_handle_out_of_bounds+0x118/0x140 lib/ubsan.c:282
 xtLookup+0x8cc/0x8e0 fs/jfs/jfs_xtree.c:190
 jfs_get_block+0x2e5/0xe50 fs/jfs/inode.c:218
 get_more_blocks fs/direct-io.c:673 [inline]
 do_direct_IO fs/direct-io.c:959 [inline]
 do_blockdev_direct_IO fs/direct-io.c:1276 [inline]
 __blockdev_direct_IO+0x1b13/0x4f40 fs/direct-io.c:1368
 blockdev_direct_IO include/linux/fs.h:3230 [inline]
 jfs_direct_IO+0xf6/0x1e0 fs/jfs/inode.c:343
 generic_file_direct_write+0x204/0x460 mm/filemap.c:3678
 __generic_file_write_iter+0x2a2/0x4f0 mm/filemap.c:3860
 generic_file_write_iter+0xa7/0x1b0 mm/filemap.c:3935
 do_iter_readv_writev+0x594/0x7a0
 do_iter_write+0x1ea/0x760 fs/read_write.c:855
 iter_file_splice_write+0x806/0xfa0 fs/splice.c:689
 do_splice_from fs/splice.c:767 [inline]
 direct_splice_actor+0xe3/0x1c0 fs/splice.c:936
 splice_direct_to_actor+0x500/0xc10 fs/splice.c:891
 do_splice_direct+0x285/0x3d0 fs/splice.c:979
 do_sendfile+0x625/0xff0 fs/read_write.c:1249
 __do_sys_sendfile64 fs/read_write.c:1317 [inline]
 __se_sys_sendfile64+0x178/0x1e0 fs/read_write.c:1303
 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+0x61/0xcb
RIP: 0033:0x7f8a10ca9f09
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 a1 15 00 00 90 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:00007f8a10c542f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f8a10d547e0 RCX: 00007f8a10ca9f09
RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000008
RBP: 00007f8a10d547ec R08: 0000000000000000 R09: 0000000000000000
R10: 0001000000201004 R11: 0000000000000246 R12: 00007f8a10d20ed0
R13: 723d73726f727265 R14: 0030656c69662f2e R15: 00007f8a10d547e8
 </TASK>
================================================================================

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/07/04 11:41 linux-5.15.y 4af60700a60c 6e553898 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro #1] [mounted in repro #2] ci2-linux-5-15-kasan UBSAN: array-index-out-of-bounds in xtLookup
* Struck through repros no longer work on HEAD.