syzbot


UBSAN: shift-out-of-bounds in extAlloc (2)

Status: upstream: reported C repro on 2024/05/03 13:40
Subsystems: jfs
[Documentation on labels]
Reported-by: syzbot+13e8cd4926977f8337b6@syzkaller.appspotmail.com
First crash: 42d, last: 20d
Cause bisection: the issue happens on the oldest tested release (bisect log)
Crash: BUG: unable to handle kernel paging request in dbAdjTree (log)
Repro: C syz .config
  
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [jfs?] UBSAN: shift-out-of-bounds in extAlloc (2) 4 (7) 2024/06/01 03:31
Similar bugs (3)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream UBSAN: shift-out-of-bounds in extAlloc jfs C error 6605 267d 627d 23/27 fixed on 2023/10/12 12:47
linux-5.15 UBSAN: shift-out-of-bounds in extAlloc origin:upstream C done 217 271d 463d 3/3 fixed on 2023/10/20 00:28
linux-6.1 UBSAN: shift-out-of-bounds in extAlloc origin:upstream missing-backport C done 203 209d 460d 0/3 upstream: reported C repro on 2023/03/12 23:53
Last patch testing requests (4)
Created Duration User Patch Repo Result
2024/06/01 03:01 23m aha310510@gmail.com patch upstream OK log
2024/05/31 11:08 2h20m aha310510@gmail.com patch upstream OK log
2024/05/25 16:31 15m retest repro linux-next report log
2024/05/25 16:31 43m retest repro git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci report log

Sample crash report:
loop0: detected capacity change from 0 to 32768
------------[ cut here ]------------
UBSAN: shift-out-of-bounds in fs/jfs/jfs_extent.c:319:16
shift exponent 108 is too large for 64-bit type 's64' (aka 'long long')
CPU: 0 PID: 5090 Comm: syz-executor421 Not tainted 6.9.0-rc6-next-20240503-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
 ubsan_epilogue lib/ubsan.c:231 [inline]
 __ubsan_handle_shift_out_of_bounds+0x3c8/0x420 lib/ubsan.c:468
 extBalloc fs/jfs/jfs_extent.c:319 [inline]
 extAlloc+0xe5c/0x1010 fs/jfs/jfs_extent.c:122
 jfs_get_block+0x41b/0xe60 fs/jfs/inode.c:248
 __block_write_begin_int+0x50c/0x1a70 fs/buffer.c:2128
 __block_write_begin fs/buffer.c:2177 [inline]
 block_write_begin+0x9b/0x1e0 fs/buffer.c:2236
 jfs_write_begin+0x31/0x70 fs/jfs/inode.c:299
 generic_perform_write+0x322/0x640 mm/filemap.c:4016
 generic_file_write_iter+0xaf/0x310 mm/filemap.c:4137
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0xa72/0xc90 fs/read_write.c:590
 ksys_write+0x1a0/0x2c0 fs/read_write.c:643
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4d15f6f639
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 61 17 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:00007fff3dae85f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fff3dae87c8 RCX: 00007f4d15f6f639
RDX: 00000000fffffef2 RSI: 0000000020000240 RDI: 0000000000000004
RBP: 00007f4d15fe8610 R08: 0000000000000000 R09: 00007fff3dae87c8
R10: 0000000000006162 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fff3dae87b8 R14: 0000000000000001 R15: 0000000000000001
 </TASK>
---[ end trace ]---

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/05/03 13:30 linux-next 9221b2819b8a 375d4445 .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-linux-next-kasan-gce-root UBSAN: shift-out-of-bounds in extAlloc
2024/05/11 11:51 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci fda5695d692c 9026e142 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-gce-arm64 UBSAN: shift-out-of-bounds in extAlloc
2024/05/03 12:50 linux-next 9221b2819b8a 375d4445 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root UBSAN: shift-out-of-bounds in extAlloc
* Struck through repros no longer work on HEAD.