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Date: Tue, 19 Oct 2021 11:14:07 +0800
From: kernel test robot <oliver.sang@...el.com>
To: David Hildenbrand <david@...hat.com>
Cc: "Eric W. Biederman" <ebiederm@...ssion.com>,
Christian König <christian.koenig@....com>,
LKML <linux-kernel@...r.kernel.org>, lkp@...ts.01.org,
lkp@...el.com
Subject: [mm] 6128b3af2a: UBSAN:shift-out-of-bounds_in(null)
Greeting,
FYI, we noticed the following commit (built with clang-14):
commit: 6128b3af2a5e42386aa7faf37609b57f39fb7d00 ("mm: ignore MAP_DENYWRITE in ksys_mmap_pgoff()")
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master
in testcase: trinity
version: trinity-i386-4d2343bd-1_20200320
with following parameters:
runtime: 300s
test-description: Trinity is a linux system call fuzz tester.
test-url: http://codemonkey.org.uk/projects/trinity/
on test machine: qemu-system-i386 -enable-kvm -cpu SandyBridge -smp 2 -m 4G
caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
+---------------------------------------------+------------+------------+
| | 8d0920bde5 | 6128b3af2a |
+---------------------------------------------+------------+------------+
| UBSAN:shift-out-of-bounds_in(null) | 0 | 9 |
+---------------------------------------------+------------+------------+
If you fix the issue, kindly add following tag
Reported-by: kernel test robot <oliver.sang@...el.com>
[ 126.758570][ T3293] ================================================================================
[ 126.758949][ T3293] UBSAN: shift-out-of-bounds in (null):0:0
[ 126.759174][ T3293] BUG: kernel NULL pointer dereference, address: 00000000
[ 126.759447][ T3293] #PF: supervisor read access in kernel mode
[ 126.759676][ T3293] #PF: error_code(0x0000) - not-present page
[ 126.759905][ T3293] *pde = 00000000
[ 126.760047][ T3293] Oops: 0000 [#1] SMP
[ 126.760205][ T3293] CPU: 1 PID: 3293 Comm: trinity-c4 Not tainted 5.14.0-00006-g6128b3af2a5e #1
[ 126.760541][ T3293] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
[ 126.760890][ T3293] EIP: __ubsan_handle_shift_out_of_bounds+0x88/0x350
[ 126.761147][ T3293] Code: 00 83 c4 04 7f 23 47 04 7f 23 47 04 ff 37 68 ef ff 37 68 ef e3 77 d0 d7 e3 77 d0 d7 00 8b 45 f0 00 8b 45 f0 c4 14 66 83 c4 14 <66> 83 66
83 3f 00 66 83 3f 00 00 00 66 83 00 00 66 83 b9 01 00 00
[ 126.761889][ T3293] EAX: 00000000 EBX: f345b500 ECX: 00000027 EDX: eba9ce40
[ 126.762159][ T3293] ESI: 00000046 EDI: 00000000 EBP: f3575f40 ESP: f3575ecc
[ 126.762428][ T3293] DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068 EFLAGS: 00010286
[ 126.762718][ T3293] CR0: 80050033 CR2: 00000000 CR3: 33464000 CR4: 000406d0
[ 126.762989][ T3293] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
[ 126.763259][ T3293] DR6: fffe0ff0 DR7: 00000400
[ 126.763436][ T3293] Call Trace:
[ 126.763562][ T3293] ? rcu_lock_acquire+0x30/0x30
[ 126.763749][ T3293] ? rcu_read_lock_sched_held+0x31/0x70
[ 126.763960][ T3293] ksys_mmap_pgoff+0x1fc/0x290
[ 126.764146][ T3293] __ia32_sys_mmap_pgoff+0x1c/0x30
[ 126.764343][ T3293] do_int80_syscall_32+0x39/0x80
[ 126.764532][ T3293] entry_INT80_32+0x10d/0x10d
[ 126.764709][ T3293] EIP: 0xb7fbda02
[ 126.764848][ T3293] Code: 95 01 00 05 25 36 02 00 83 ec 14 8d 80 e8 99 ff ff 50 6a 02 e8 1f ff 00 00 c7 04 24 7f 00 00 00 e8 7e 87 01 00 66 90 90 cd 80 <c3> 8d b6
00 00 00 00 8d bc 27 00 00 00 00 8b 1c 24 c3 8d b6 00 00
[ 126.765591][ T3293] EAX: ffffffda EBX: 00000000 ECX: 00001000 EDX: 55dd7eb6
[ 126.765859][ T3293] ESI: f0bd6374 EDI: ffffffff EBP: 00000000 ESP: bf9964d8
[ 126.766129][ T3293] DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 007b EFLAGS: 00000296
[ 126.766419][ T3293] Modules linked in: aesni_intel crypto_simd qemu_fw_cfg autofs4
[ 126.766715][ T3293] CR2: 0000000000000000
[ 126.766894][ T3293] ---[ end trace e6000e119f0dc7f3 ]---
[ 126.767105][ T3293] EIP: __ubsan_handle_shift_out_of_bounds+0x88/0x350
[ 126.767361][ T3293] Code: 00 83 c4 04 7f 23 47 04 7f 23 47 04 ff 37 68 ef ff 37 68 ef e3 77 d0 d7 e3 77 d0 d7 00 8b 45 f0 00 8b 45 f0 c4 14 66 83 c4 14 <66> 83 66 83 3f 00 66 83 3f 00 00 00 66 83 00 00 66 83 b9 01 00 00
[ 126.768112][ T3293] EAX: 00000000 EBX: f345b500 ECX: 00000027 EDX: eba9ce40
[ 126.768384][ T3293] ESI: 00000046 EDI: 00000000 EBP: f3575f40 ESP: f3575ecc
[ 126.768657][ T3293] DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068 EFLAGS: 00010286
[ 126.768947][ T3293] CR0: 80050033 CR2: 00000000 CR3: 33464000 CR4: 000406d0
[ 126.769223][ T3293] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
[ 126.769496][ T3293] DR6: fffe0ff0 DR7: 00000400
[ 126.769680][ T3293] Kernel panic - not syncing: Fatal exception
[ 126.769946][ T3293] Kernel Offset: disabled
To reproduce:
# build kernel
cd linux
cp config-5.14.0-00006-g6128b3af2a5e .config
make HOSTCC=clang-14 CC=clang-14 ARCH=i386 olddefconfig prepare modules_prepare bzImage
git clone https://github.com/intel/lkp-tests.git
cd lkp-tests
bin/lkp qemu -k <bzImage> 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-5.14.0-00006-g6128b3af2a5e" of type "text/plain" (117713 bytes)
View attachment "job-script" of type "text/plain" (4388 bytes)
Download attachment "dmesg.xz" of type "application/x-xz" (16924 bytes)
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