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Date: Wed, 7 Sep 2022 13:42:16 +0800
From: kernel test robot <oliver.sang@...el.com>
To: Kees Cook <keescook@...omium.org>
CC: <lkp@...ts.01.org>, <lkp@...el.com>,
<linux-hardening@...r.kernel.org>,
"Gustavo A. R. Silva" <gustavoars@...nel.org>,
Kees Cook <keescook@...omium.org>,
Arnd Bergmann <arnd@...db.de>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Shuah Khan <shuah@...nel.org>,
"Nathan Chancellor" <nathan@...nel.org>,
Nick Desaulniers <ndesaulniers@...gle.com>,
Tom Rix <trix@...hat.com>, <linux-kernel@...r.kernel.org>,
<linux-kselftest@...r.kernel.org>, <llvm@...ts.linux.dev>
Subject: [fortify] 728833277d:
WARNING:at_net/netlink/af_netlink.c:#netlink_ack
Hi Kees Cook,
the patch "[PATCH 1/2] fortify: Add run-time WARN for cross-field memcpy()"
raises a persistent WARNING as below report in our tests.
according to commit message, we understand this is kind of expected. but
we don't have enough knowledge if it reveals a real issue in kernel source
code and what the next step could be.
so we still report FYI.
if you think it's unnecessary for us to make out this kind of report, please
let us know. we will consider how to refine our report rules. Thanks a lot!
below is the full report.
Greeting,
FYI, we noticed the following commit (built with gcc-11):
commit: 728833277da4a9643cb7ff62651ecb0124dfc610 ("[PATCH 1/2] fortify: Add run-time WARN for cross-field memcpy()")
url: https://github.com/intel-lab-lkp/linux/commits/Kees-Cook/fortify-Add-run-time-WARN-for-cross-field-memcpy/20220901-150051
base: https://git.kernel.org/cgit/linux/kernel/git/kees/linux.git for-next/hardening
patch link: https://lore.kernel.org/lkml/20220901065914.1417829-2-keescook@chromium.org
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):
If you fix the issue, kindly add following tag
Reported-by: kernel test robot <oliver.sang@...el.com>
Link: https://lore.kernel.org/r/202209071317.245c5751-oliver.sang@intel.com
Configuring network interfaces... [ 20.451857][ T337] ------------[ cut here ]------------
[ 20.452641][ T337] memcpy: detected field-spanning write (size 40) of single field "&errmsg->msg" at net/netlink/af_netlink.c:2447 (size 16)
[ 20.454064][ T337] WARNING: CPU: 1 PID: 337 at net/netlink/af_netlink.c:2447 netlink_ack (net/netlink/af_netlink.c:2447 (discriminator 7))
[ 20.455040][ T337] Modules linked in: bochs drm_vram_helper drm_ttm_helper ttm sr_mod cdrom intel_rapl_msr drm_kms_helper intel_rapl_common ata_generic syscopyarea crct10dif_pclmul ppdev crc32_pclmul crc32c_intel sysfillrect sysimgblt fb_sys_fops ghash_clmulni_intel rapl ata_piix drm libata joydev parport_pc parport i2c_piix4 serio_raw
[ 20.458022][ T337] CPU: 1 PID: 337 Comm: ip Not tainted 6.0.0-rc2-00005-g728833277da4 #1
[ 20.458880][ T337] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.0-debian-1.16.0-4 04/01/2014
[ 20.459868][ T337] RIP: 0010:netlink_ack (net/netlink/af_netlink.c:2447 (discriminator 7))
[ 20.460395][ T337] Code: 00 00 00 4c 89 ee 48 c7 c2 a0 14 e6 83 48 c7 c7 00 15 e6 83 4c 89 5c 24 20 4c 89 4c 24 18 c6 05 c9 b4 1a 02 01 e8 66 ea 58 00 <0f> 0b 4c 8b 5c 24 20 4c 8b 4c 24 18 e9 78 fc ff ff 83 c0 07 25 fc
All code
========
0: 00 00 add %al,(%rax)
2: 00 4c 89 ee add %cl,-0x12(%rcx,%rcx,4)
6: 48 c7 c2 a0 14 e6 83 mov $0xffffffff83e614a0,%rdx
d: 48 c7 c7 00 15 e6 83 mov $0xffffffff83e61500,%rdi
14: 4c 89 5c 24 20 mov %r11,0x20(%rsp)
19: 4c 89 4c 24 18 mov %r9,0x18(%rsp)
1e: c6 05 c9 b4 1a 02 01 movb $0x1,0x21ab4c9(%rip) # 0x21ab4ee
25: e8 66 ea 58 00 callq 0x58ea90
2a:* 0f 0b ud2 <-- trapping instruction
2c: 4c 8b 5c 24 20 mov 0x20(%rsp),%r11
31: 4c 8b 4c 24 18 mov 0x18(%rsp),%r9
36: e9 78 fc ff ff jmpq 0xfffffffffffffcb3
3b: 83 c0 07 add $0x7,%eax
3e: 25 .byte 0x25
3f: fc cld
Code starting with the faulting instruction
===========================================
0: 0f 0b ud2
2: 4c 8b 5c 24 20 mov 0x20(%rsp),%r11
7: 4c 8b 4c 24 18 mov 0x18(%rsp),%r9
c: e9 78 fc ff ff jmpq 0xfffffffffffffc89
11: 83 c0 07 add $0x7,%eax
14: 25 .byte 0x25
15: fc cld
[ 20.462364][ T337] RSP: 0018:ffffc90000f67770 EFLAGS: 00010286
[ 20.462989][ T337] RAX: 0000000000000000 RBX: ffffc90000f678a0 RCX: 0000000000000000
[ 20.463755][ T337] RDX: 0000000000000000 RSI: 1ffff920001eceb7 RDI: fffff520001ecee0
[ 20.464545][ T337] RBP: ffff88812300b800 R08: 0000000000000000 R09: ffffc90000f674a7
[ 20.465344][ T337] R10: fffff520001ece94 R11: 0000000000000001 R12: ffff88817bc47780
[ 20.466147][ T337] R13: 0000000000000028 R14: ffff888123009800 R15: ffff88817bc477b4
[ 20.466962][ T337] FS: 00007f5a7e1c4740(0000) GS:ffff88839d700000(0000) knlGS:0000000000000000
[ 20.467820][ T337] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 20.468483][ T337] CR2: 00007f5a7e2afb70 CR3: 0000000161e42000 CR4: 00000000000406e0
[ 20.469269][ T337] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 20.470132][ T337] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 20.470897][ T337] Call Trace:
[ 20.474440][ T337] <TASK>
[ 20.477798][ T337] ? rtnl_calcit+0x200/0x2c0
[ 20.481447][ T337] ? netlink_sendmsg (net/netlink/af_netlink.c:2405)
[ 20.485013][ T337] ? kasan_save_stack (mm/kasan/common.c:40)
[ 20.488546][ T337] ? kasan_save_stack (mm/kasan/common.c:39)
[ 20.492056][ T337] ? __kasan_slab_alloc (mm/kasan/common.c:45 mm/kasan/common.c:437 mm/kasan/common.c:470)
[ 20.499830][ T337] ? kmem_cache_alloc_lru (mm/slab.h:727 mm/slub.c:3243 mm/slub.c:3251 mm/slub.c:3258 mm/slub.c:3275)
[ 20.503341][ T337] ? proc_alloc_inode (fs/proc/inode.c:68)
[ 20.509279][ T337] ? alloc_inode (fs/inode.c:260)
[ 20.512708][ T337] netlink_rcv_skb (net/netlink/af_netlink.c:2507)
[ 20.516102][ T337] ? rtnl_calcit+0x2c0/0x2c0
[ 20.519486][ T337] ? netlink_ack (net/netlink/af_netlink.c:2478)
[ 20.522845][ T337] ? _copy_from_iter (lib/iov_iter.c:628 (discriminator 11))
[ 20.526084][ T337] netlink_unicast (net/netlink/af_netlink.c:1320 net/netlink/af_netlink.c:1345)
[ 20.529358][ T337] ? netlink_attachskb (net/netlink/af_netlink.c:1330)
[ 20.536737][ T337] ? check_heap_object (arch/x86/include/asm/bitops.h:207 arch/x86/include/asm/bitops.h:225 include/asm-generic/bitops/instrumented-non-atomic.h:142 include/linux/page-flags.h:487 mm/usercopy.c:193)
[ 20.540176][ T337] netlink_sendmsg (net/netlink/af_netlink.c:1921)
[ 20.543450][ T337] ? netlink_unicast (net/netlink/af_netlink.c:1841)
[ 20.546636][ T337] ? __import_iovec (lib/iov_iter.c:1771)
[ 20.549779][ T337] ? netlink_unicast (net/netlink/af_netlink.c:1841)
[ 20.552946][ T337] sock_sendmsg (net/socket.c:714 net/socket.c:734)
[ 20.556037][ T337] ____sys_sendmsg (net/socket.c:2482)
[ 20.559128][ T337] ? kernel_sendmsg (net/socket.c:2429)
[ 20.562184][ T337] ? __copy_msghdr (net/socket.c:2409)
[ 20.565212][ T337] ? __kasan_record_aux_stack (mm/kasan/generic.c:348)
[ 20.568287][ T337] ? call_rcu (arch/x86/include/asm/irqflags.h:29 (discriminator 3) arch/x86/include/asm/irqflags.h:70 (discriminator 3) arch/x86/include/asm/irqflags.h:106 (discriminator 3) kernel/rcu/tree.c:2794 (discriminator 3))
[ 20.571262][ T337] ? task_work_run (kernel/task_work.c:179 (discriminator 1))
[ 20.574198][ T337] ? exit_to_user_mode_loop (include/linux/resume_user_mode.h:49 kernel/entry/common.c:169)
[ 20.577141][ T337] ? exit_to_user_mode_prepare (kernel/entry/common.c:201)
[ 20.580055][ T337] ? syscall_exit_to_user_mode (arch/x86/include/asm/jump_label.h:27 include/linux/context_tracking_state.h:106 include/linux/context_tracking.h:41 kernel/entry/common.c:132 kernel/entry/common.c:296)
[ 20.582845][ T337] ___sys_sendmsg (net/socket.c:2538)
[ 20.585414][ T337] ? rcu_nocb_try_bypass (kernel/rcu/tree_nocb.h:382)
[ 20.587947][ T337] ? __ia32_sys_recvmmsg (net/socket.c:2525)
[ 20.590446][ T337] ? rcu_gp_kthread (kernel/rcu/tree_nocb.h:371)
[ 20.592791][ T337] ? fsnotify_grab_connector (fs/notify/mark.c:601)
[ 20.599331][ T337] ? rcu_segcblist_enqueue (arch/x86/include/asm/atomic64_64.h:46 include/linux/atomic/atomic-long.h:53 include/linux/atomic/atomic-instrumented.h:1295 kernel/rcu/rcu_segcblist.c:214 kernel/rcu/rcu_segcblist.c:231 kernel/rcu/rcu_segcblist.c:343)
[ 20.601685][ T337] ? call_rcu (arch/x86/include/asm/atomic64_64.h:22 include/linux/atomic/atomic-long.h:29 include/linux/atomic/atomic-instrumented.h:1266 kernel/rcu/rcu_segcblist.h:50 kernel/rcu/tree.c:2658 kernel/rcu/tree.c:2827)
[ 20.603842][ T337] ? _raw_write_lock_irq (kernel/locking/spinlock.c:153)
[ 20.606010][ T337] ? rcu_gp_kthread (kernel/rcu/tree_nocb.h:371)
[ 20.608185][ T337] ? kmem_cache_free (mm/slub.c:1780 mm/slub.c:3534 mm/slub.c:3551)
[ 20.610331][ T337] ? __fget_light (arch/x86/include/asm/atomic.h:29 include/linux/atomic/atomic-instrumented.h:28 fs/file.c:1005)
[ 20.612390][ T337] ? rcu_segcblist_enqueue (arch/x86/include/asm/atomic64_64.h:46 include/linux/atomic/atomic-long.h:53 include/linux/atomic/atomic-instrumented.h:1295 kernel/rcu/rcu_segcblist.c:214 kernel/rcu/rcu_segcblist.c:231 kernel/rcu/rcu_segcblist.c:343)
[ 20.614546][ T337] __sys_sendmsg (include/linux/file.h:31 net/socket.c:2567)
[ 20.616587][ T337] ? __sys_sendmsg_sock (net/socket.c:2553)
[ 20.618675][ T337] ? __fput (include/linux/percpu_counter.h:189 fs/file_table.c:58 fs/file_table.c:338)
[ 20.620624][ T337] ? exit_to_user_mode_loop (include/linux/sched.h:2305 include/linux/resume_user_mode.h:61 kernel/entry/common.c:169)
[ 20.622677][ T337] do_syscall_64 (arch/x86/entry/common.c:50 arch/x86/entry/common.c:80)
[ 20.624621][ T337] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:120)
[ 20.626731][ T337] RIP: 0033:0x7f5a7e2beff4
[ 20.628638][ T337] Code: 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b5 0f 1f 80 00 00 00 00 48 8d 05 49 12 0c 00 8b 00 85 c0 75 13 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 54 c3 0f 1f 00 41 54 41 89 d4 55 48 89 f5 53
All code
========
0: 00 f7 add %dh,%bh
2: d8 64 89 02 fsubs 0x2(%rcx,%rcx,4)
6: 48 c7 c0 ff ff ff ff mov $0xffffffffffffffff,%rax
d: eb b5 jmp 0xffffffffffffffc4
f: 0f 1f 80 00 00 00 00 nopl 0x0(%rax)
16: 48 8d 05 49 12 0c 00 lea 0xc1249(%rip),%rax # 0xc1266
1d: 8b 00 mov (%rax),%eax
1f: 85 c0 test %eax,%eax
21: 75 13 jne 0x36
23: b8 2e 00 00 00 mov $0x2e,%eax
28: 0f 05 syscall
2a:* 48 3d 00 f0 ff ff cmp $0xfffffffffffff000,%rax <-- trapping instruction
30: 77 54 ja 0x86
32: c3 retq
33: 0f 1f 00 nopl (%rax)
36: 41 54 push %r12
38: 41 89 d4 mov %edx,%r12d
3b: 55 push %rbp
3c: 48 89 f5 mov %rsi,%rbp
3f: 53 push %rbx
Code starting with the faulting instruction
===========================================
0: 48 3d 00 f0 ff ff cmp $0xfffffffffffff000,%rax
6: 77 54 ja 0x5c
8: c3 retq
9: 0f 1f 00 nopl (%rax)
c: 41 54 push %r12
e: 41 89 d4 mov %edx,%r12d
11: 55 push %rbp
12: 48 89 f5 mov %rsi,%rbp
15: 53 push %rbx
To reproduce:
# build kernel
cd linux
cp config-6.0.0-rc2-00005-g728833277da4 .config
make HOSTCC=gcc-11 CC=gcc-11 ARCH=x86_64 olddefconfig prepare modules_prepare bzImage modules
make HOSTCC=gcc-11 CC=gcc-11 ARCH=x86_64 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.
--
0-DAY CI Kernel Test Service
https://01.org/lkp
View attachment "config-6.0.0-rc2-00005-g728833277da4" of type "text/plain" (164628 bytes)
View attachment "job-script" of type "text/plain" (4875 bytes)
Download attachment "dmesg.xz" of type "application/x-xz" (14044 bytes)
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