syzbot


linux-next test error: UBSAN: array-index-out-of-bounds in alloc_pid

Status: fixed on 2023/10/12 12:48
Subsystems: kernel
[Documentation on labels]
Reported-by: syzbot+ac3b41786a2d0565b6d5@syzkaller.appspotmail.com
Fix commit: b69f0aeb0689 pid: Replace struct pid 1-element array with flex-array
First crash: 292d, last: 291d
Discussions (4)
Title Replies (including bot) Last reply
[PATCH v2] pid: Replace struct pid 1-element array with flex-array 3 (3) 2023/07/01 06:24
Re: [GIT PULL] pid: use flex array 1 (1) 2023/06/30 08:04
[PATCH] pid: Replace struct pid 1-element array with flex-array 4 (4) 2023/05/30 14:44
[syzbot] [kernel?] linux-next test error: UBSAN: array-index-out-of-bounds in alloc_pid 2 (3) 2023/05/17 15:38

Sample crash report:
================================================================================
UBSAN: array-index-out-of-bounds in kernel/pid.c:244:15
index 1 is out of range for type 'upid [1]'
CPU: 0 PID: 5002 Comm: syz-executor.0 Not tainted 6.4.0-rc2-next-20230517-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x136/0x150 lib/dump_stack.c:106
 ubsan_epilogue lib/ubsan.c:217 [inline]
 __ubsan_handle_out_of_bounds+0xd5/0x140 lib/ubsan.c:348
 alloc_pid+0xbe5/0xdd0 kernel/pid.c:244
 copy_process+0x45da/0x7660 kernel/fork.c:2522
 kernel_clone+0xeb/0x890 kernel/fork.c:2914
 __do_sys_clone+0xba/0x100 kernel/fork.c:3057
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fc91c689e9b
Code: ed 0f 85 60 01 00 00 64 4c 8b 0c 25 10 00 00 00 45 31 c0 4d 8d 91 d0 02 00 00 31 d2 31 f6 bf 11 00 20 01 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 89 00 00 00 41 89 c5 85 c0 0f 85 90 00 00
RSP: 002b:00007ffee7cf2850 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007ffee7cf2ea8 RCX: 00007fc91c689e9b
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000555556433400
R10: 00005555564336d0 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffee7cf2940 R14: 00007fc91c7ac9d8 R15: 000000000000000c
 </TASK>
================================================================================

Crashes (9):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/05/18 00:31 linux-next 065efa589871 3bb7af1d .config console log report ci-upstream-linux-next-kasan-gce-root linux-next test error: UBSAN: array-index-out-of-bounds in alloc_pid
2023/05/18 00:30 linux-next 065efa589871 3bb7af1d .config console log report ci-upstream-linux-next-kasan-gce-root linux-next test error: UBSAN: array-index-out-of-bounds in alloc_pid
2023/05/18 00:30 linux-next 065efa589871 3bb7af1d .config console log report ci-upstream-linux-next-kasan-gce-root linux-next test error: UBSAN: array-index-out-of-bounds in alloc_pid
2023/05/17 08:23 linux-next 065efa589871 eaac4681 .config console log report ci-upstream-linux-next-kasan-gce-root linux-next test error: UBSAN: array-index-out-of-bounds in alloc_pid
2023/05/17 08:23 linux-next 065efa589871 eaac4681 .config console log report ci-upstream-linux-next-kasan-gce-root linux-next test error: UBSAN: array-index-out-of-bounds in alloc_pid
2023/05/17 08:23 linux-next 065efa589871 eaac4681 .config console log report ci-upstream-linux-next-kasan-gce-root linux-next test error: UBSAN: array-index-out-of-bounds in alloc_pid
2023/05/17 02:35 linux-next 065efa589871 11c89444 .config console log report ci-upstream-linux-next-kasan-gce-root linux-next test error: UBSAN: array-index-out-of-bounds in alloc_pid
2023/05/17 02:35 linux-next 065efa589871 11c89444 .config console log report ci-upstream-linux-next-kasan-gce-root linux-next test error: UBSAN: array-index-out-of-bounds in alloc_pid
2023/05/17 02:34 linux-next 065efa589871 11c89444 .config console log report ci-upstream-linux-next-kasan-gce-root linux-next test error: UBSAN: array-index-out-of-bounds in alloc_pid
* Struck through repros no longer work on HEAD.