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Date: Fri, 4 Feb 2022 20:37:40 +0800
From: kernel test robot <oliver.sang@...el.com>
To: Nick Desaulniers <ndesaulniers@...gle.com>
Cc: Kees Cook <keescook@...omium.org>,
Arvind Sankar <nivedita@...m.mit.edu>,
Fangrui Song <maskray@...gle.com>,
LKML <linux-kernel@...r.kernel.org>, lkp@...ts.01.org,
lkp@...el.com
Subject: [x86] 1099ce55b0: BUG:kernel_NULL_pointer_dereference,address
Greeting,
FYI, we noticed the following commit (built with clang-15):
commit: 1099ce55b0530ff429312dc37362ad43aee8c5c0 ("x86: don't build CONFIG_X86_32 as -ffreestanding")
https://git.kernel.org/cgit/linux/kernel/git/kees/linux.git for-next/memcpy
in testcase: boot
on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G
caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
+---------------------------------------------+------------+------------+
| | 274d8f425a | 1099ce55b0 |
+---------------------------------------------+------------+------------+
| boot_successes | 9 | 0 |
| boot_failures | 0 | 10 |
| BUG:kernel_NULL_pointer_dereference,address | 0 | 10 |
| Oops:#[##] | 0 | 10 |
| EIP:bcmp | 0 | 10 |
| Kernel_panic-not_syncing:Fatal_exception | 0 | 10 |
| Kernel_panic-not_syncing:Fatal_exception] | 0 | 10 |
+---------------------------------------------+------------+------------+
If you fix the issue, kindly add following tag
Reported-by: kernel test robot <oliver.sang@...el.com>
[ 0.000000][ T0] BUG: kernel NULL pointer dereference, address: 0000004d
[ 0.000000][ T0] #PF: supervisor read access in kernel mode
[ 0.000000][ T0] #PF: error_code(0x0000) - not-present page
[ 0.000000][ T0] *pde = 00000000
[ 0.000000][ T0] Oops: 0000 [#1]
[ 0.000000][ T0] CPU: 0 PID: 0 Comm: swapper Not tainted 5.17.0-rc2-00011-g1099ce55b053 #1
[ 0.000000][ T0] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
[ 0.000000][ T0] EIP: bcmp (??:?)
[ 0.000000][ T0] Code: 90 90 90 90 90 90 90 90 55 89 e5 53 57 56 50 83 f9 04 72 33 83 05 c8 e5 9c c2 01 8b 35 cc e5 9c c2 83 c6 01 90 90 90 90 8b 38 <3b> 3a 75 26 89 35 cc e5 9c c2 83 c0 04 83 c2 04 83 c1 fc 83 c6 01
All code
========
0: 90 nop
1: 90 nop
2: 90 nop
3: 90 nop
4: 90 nop
5: 90 nop
6: 90 nop
7: 90 nop
8: 55 push %rbp
9: 89 e5 mov %esp,%ebp
b: 53 push %rbx
c: 57 push %rdi
d: 56 push %rsi
e: 50 push %rax
f: 83 f9 04 cmp $0x4,%ecx
12: 72 33 jb 0x47
14: 83 05 c8 e5 9c c2 01 addl $0x1,-0x3d631a38(%rip) # 0xffffffffc29ce5e3
1b: 8b 35 cc e5 9c c2 mov -0x3d631a34(%rip),%esi # 0xffffffffc29ce5ed
21: 83 c6 01 add $0x1,%esi
24: 90 nop
25: 90 nop
26: 90 nop
27: 90 nop
28: 8b 38 mov (%rax),%edi
2a:* 3b 3a cmp (%rdx),%edi <-- trapping instruction
2c: 75 26 jne 0x54
2e: 89 35 cc e5 9c c2 mov %esi,-0x3d631a34(%rip) # 0xffffffffc29ce600
34: 83 c0 04 add $0x4,%eax
37: 83 c2 04 add $0x4,%edx
3a: 83 c1 fc add $0xfffffffc,%ecx
3d: 83 c6 01 add $0x1,%esi
Code starting with the faulting instruction
===========================================
0: 3b 3a cmp (%rdx),%edi
2: 75 26 jne 0x2a
4: 89 35 cc e5 9c c2 mov %esi,-0x3d631a34(%rip) # 0xffffffffc29ce5d6
a: 83 c0 04 add $0x4,%eax
d: 83 c2 04 add $0x4,%edx
10: 83 c1 fc add $0xfffffffc,%ecx
13: 83 c6 01 add $0x1,%esi
[ 0.000000][ T0] EAX: c23b5f10 EBX: 4b4d564b ECX: 564b4d56 EDX: 0000004d
[ 0.000000][ T0] ESI: 00000001 EDI: 4b4d564b EBP: c23b5efc ESP: c23b5eec
[ 0.000000][ T0] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068 EFLAGS: 00210002
[ 0.000000][ T0] CR0: 80050033 CR2: 0000004d CR3: 02b4d000 CR4: 00040600
[ 0.000000][ T0] Call Trace:
[ 0.000000][ T0] vmware_platform (vmware.c:?)
[ 0.000000][ T0] detect_hypervisor_vendor (hypervisor.c:?)
[ 0.000000][ T0] init_hypervisor_platform (??:?)
[ 0.000000][ T0] setup_arch (??:?)
[ 0.000000][ T0] ? vprintk (??:?)
[ 0.000000][ T0] ? _printk (??:?)
[ 0.000000][ T0] start_kernel (??:?)
[ 0.000000][ T0] i386_start_kernel (??:?)
[ 0.000000][ T0] startup_32_smp (??:?)
[ 0.000000][ T0] Modules linked in:
[ 0.000000][ T0] CR2: 000000000000004d
[ 0.000000][ T0] ---[ end trace 0000000000000000 ]---
[ 0.000000][ T0] EIP: bcmp (??:?)
[ 0.000000][ T0] Code: 90 90 90 90 90 90 90 90 55 89 e5 53 57 56 50 83 f9 04 72 33 83 05 c8 e5 9c c2 01 8b 35 cc e5 9c c2 83 c6 01 90 90 90 90 8b 38 <3b> 3a 75 26 89 35 cc e5 9c c2 83 c0 04 83 c2 04 83 c1 fc 83 c6 01
All code
========
0: 90 nop
1: 90 nop
2: 90 nop
3: 90 nop
4: 90 nop
5: 90 nop
6: 90 nop
7: 90 nop
8: 55 push %rbp
9: 89 e5 mov %esp,%ebp
b: 53 push %rbx
c: 57 push %rdi
d: 56 push %rsi
e: 50 push %rax
f: 83 f9 04 cmp $0x4,%ecx
12: 72 33 jb 0x47
14: 83 05 c8 e5 9c c2 01 addl $0x1,-0x3d631a38(%rip) # 0xffffffffc29ce5e3
1b: 8b 35 cc e5 9c c2 mov -0x3d631a34(%rip),%esi # 0xffffffffc29ce5ed
21: 83 c6 01 add $0x1,%esi
24: 90 nop
25: 90 nop
26: 90 nop
27: 90 nop
28: 8b 38 mov (%rax),%edi
2a:* 3b 3a cmp (%rdx),%edi <-- trapping instruction
2c: 75 26 jne 0x54
2e: 89 35 cc e5 9c c2 mov %esi,-0x3d631a34(%rip) # 0xffffffffc29ce600
34: 83 c0 04 add $0x4,%eax
37: 83 c2 04 add $0x4,%edx
3a: 83 c1 fc add $0xfffffffc,%ecx
3d: 83 c6 01 add $0x1,%esi
Code starting with the faulting instruction
===========================================
0: 3b 3a cmp (%rdx),%edi
2: 75 26 jne 0x2a
4: 89 35 cc e5 9c c2 mov %esi,-0x3d631a34(%rip) # 0xffffffffc29ce5d6
a: 83 c0 04 add $0x4,%eax
d: 83 c2 04 add $0x4,%edx
10: 83 c1 fc add $0xfffffffc,%ecx
13: 83 c6 01 add $0x1,%esi
To reproduce:
# build kernel
cd linux
cp config-5.17.0-rc2-00011-g1099ce55b053 .config
make HOSTCC=clang-15 CC=clang-15 ARCH=i386 olddefconfig prepare modules_prepare bzImage modules
make HOSTCC=clang-15 CC=clang-15 ARCH=i386 INSTALL_MOD_PATH=<mod-install-dir> modules_install
cd <mod-install-dir>
find lib/ | cpio -o -H newc --quiet | gzip > modules.cgz
git clone https://github.com/intel/lkp-tests.git
cd lkp-tests
bin/lkp qemu -k <bzImage> -m modules.cgz job-script # job-script is attached in this email
# if come across any failure that blocks the test,
# please remove ~/.lkp and /lkp dir to run from a clean state.
---
0DAY/LKP+ Test Infrastructure Open Source Technology Center
https://lists.01.org/hyperkitty/list/lkp@lists.01.org Intel Corporation
Thanks,
Oliver Sang
View attachment "config-5.17.0-rc2-00011-g1099ce55b053" of type "text/plain" (124817 bytes)
View attachment "job-script" of type "text/plain" (4656 bytes)
Download attachment "dmesg.xz" of type "application/x-xz" (2572 bytes)
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