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Date: Sun, 15 Feb 2015 08:11:44 +0800
From: Fengguang Wu <fengguang.wu@...el.com>
To: Kees Cook <keescook@...omium.org>
Cc: LKP <lkp@...org>, linux-kernel@...r.kernel.org,
linux-security-module@...r.kernel.org
Subject: [LSM] Kernel panic - not syncing: Could not register security module
Hi Kees,
0day kernel testing robot got the below dmesg and the first bad commit is
git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git revert-2228b30d2010404a0eb4a1e8e57fe04550dd9708-2228b30d2010404a0eb4a1e8e57fe04550dd9708
commit 2228b30d2010404a0eb4a1e8e57fe04550dd9708
Author: Kees Cook <keescook@...omium.org>
AuthorDate: Sat Sep 21 15:52:51 2013 -0700
Commit: Kees Cook <keescook@...omium.org>
CommitDate: Sat Feb 14 08:33:51 2015 -0800
LSM: MntRestrict blocks mounts on symlink targets
On systems where certain filesystem contents cannot be entirely trusted,
it is beneficial to block mounts on symlinks. This makes sure that
malicious filesystem contents cannot trigger the over-mounting of trusted
filesystems. (For example, a bind-mounted subdirectory of /var cannot be
redirected to mount on /etc via a symlink: a daemon cannot elevate privs
to uid-0.)
Signed-off-by: Kees Cook <keescook@...omium.org>
+-------------------------------------------------------------+------------+------------+------------+
| | 18320f2a68 | 2228b30d20 | ea62d88b64 |
+-------------------------------------------------------------+------------+------------+------------+
| boot_successes | 60 | 0 | 0 |
| boot_failures | 0 | 20 | 12 |
| Kernel_panic-not_syncing:Could_not_register_security_module | 0 | 20 | 12 |
| backtrace:panic | 0 | 20 | 12 |
| backtrace:mntrestrict_init | 0 | 20 | 12 |
| backtrace:security_init | 0 | 20 | 12 |
+-------------------------------------------------------------+------------+------------+------------+
[ 0.053230] Security Framework initialized
[ 0.053230] Security Framework initialized
[ 0.053894] Kernel panic - not syncing: Could not register security module
[ 0.053894] Kernel panic - not syncing: Could not register security module
[ 0.054991] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.19.0-04761-g2228b30 #12
[ 0.054991] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.19.0-04761-g2228b30 #12
[ 0.056162] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.7.5-20140531_083030-gandalf 04/01/2014
[ 0.056162] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.7.5-20140531_083030-gandalf 04/01/2014
[ 0.057777] ffff880013fd9340
[ 0.057777] ffff880013fd9340 ffffffff81603e98 ffffffff81603e98 ffffffff8137cebc ffffffff8137cebc 000000000000003e 000000000000003e
[ 0.058998] ffffffff81586fd5
[ 0.058998] ffffffff81586fd5 ffffffff81603f18 ffffffff81603f18 ffffffff8137be10 ffffffff8137be10 ffffffff817160c0 ffffffff817160c0
[ 0.060000] 0000000000000008
[ 0.060000] 0000000000000008 ffffffff81603f28 ffffffff81603f28 ffffffff81603ec8 ffffffff81603ec8 ffffffff81603f28 ffffffff81603f28
[ 0.060000] Call Trace:
[ 0.060000] Call Trace:
[ 0.060000] [<ffffffff8137cebc>] dump_stack+0x4c/0x65
[ 0.060000] [<ffffffff8137cebc>] dump_stack+0x4c/0x65
[ 0.060000] [<ffffffff8137be10>] panic+0xbf/0x1d1
[ 0.060000] [<ffffffff8137be10>] panic+0xbf/0x1d1
[ 0.060000] [<ffffffff816b6898>] mntrestrict_init+0x37/0x49
[ 0.060000] [<ffffffff816b6898>] mntrestrict_init+0x37/0x49
[ 0.060000] [<ffffffff816b5c43>] security_init+0x3d/0x49
[ 0.060000] [<ffffffff816b5c43>] security_init+0x3d/0x49
[ 0.060000] [<ffffffff81698e9c>] start_kernel+0x409/0x445
[ 0.060000] [<ffffffff81698e9c>] start_kernel+0x409/0x445
[ 0.060000] [<ffffffff81698120>] ? early_idt_handlers+0x120/0x120
[ 0.060000] [<ffffffff81698120>] ? early_idt_handlers+0x120/0x120
[ 0.060000] [<ffffffff816984a2>] x86_64_start_reservations+0x2a/0x2c
[ 0.060000] [<ffffffff816984a2>] x86_64_start_reservations+0x2a/0x2c
[ 0.060000] [<ffffffff81698592>] x86_64_start_kernel+0xee/0xfd
[ 0.060000] [<ffffffff81698592>] x86_64_start_kernel+0xee/0xfd
Elapsed time: 5
qemu-system-x86_64 -cpu kvm64 -enable-kvm -kernel /kernel/x86_64-randconfig-ib0-02150501/2228b30d2010404a0eb4a1e8e57fe04550dd9708/vmlinuz-3.19.0-04761-g2228b30 -append 'hung_task_panic=1 earlyprintk=ttyS0,115200 rd.udev.log-priority=err systemd.log_target=journal systemd.log_level=warning debug apic=debug sysrq_always_enabled rcupdate.rcu_cpu_stall_timeout=100 panic=-1 softlockup_panic=1 nmi_watchdog=panic oops=panic load_ramdisk=2 prompt_ramdisk=0 console=ttyS0,115200 console=tty0 vga=normal root=/dev/ram0 rw link=/kbuild-tests/run-queue/kvm/x86_64-randconfig-ib0-02150501/linux-devel:devel-lkp-ib04-smoke-201502150503:2228b30d2010404a0eb4a1e8e57fe04550dd9708:bisect-linux-0/.vmlinuz-2228b30d2010404a0eb4a1e8e57fe04550dd9708-20150215071310-7-client8 branch=linux-devel/devel-lkp-ib04-smoke-201502150503 BOOT_IMAGE=/kernel/x86_64-randconfig-ib0-02150501/2228b30d2010404a0eb4a1e8e57fe04550dd9708/vmlinuz-3.19.0-04761-g2228b30 drbd.minor_count=8' -initrd /kernel-tests/initrd/yocto-minimal-x86_64.cgz -m 320 -smp 1 -net nic,vlan=1,model=e1000 -net user,vlan=1 -boot order=nc -no-reboot -watchdog i6300esb -rtc base=localtime -pidfile /dev/shm/kboot/pid-yocto-client8-9 -serial file:/dev/shm/kboot/serial-yocto-client8-9 -daemonize -display none -monitor null
git bisect start ea62d88b645bbcc4842e572023dcadc1e83ff66d bfa76d49576599a4b9f9b7a71f23d73d6dcff735 --
git bisect bad 8d3eaae4f88608e1d6e3d193fea8bfe79d84dfce # 06:20 0- 20 Merge 'kees/nak/dcache-oob-read' into devel-lkp-ib04-smoke-201502150503
git bisect good 2754339654514dbfcebeeb88c933555c09d4ceb5 # 06:32 20+ 0 Merge 'kees/gcc-bug' into devel-lkp-ib04-smoke-201502150503
git bisect good c48d9dbdde8797093dd00425b2a13d20ae9ca978 # 06:42 20+ 0 Merge 'kees/kaslr/weak' into devel-lkp-ib04-smoke-201502150503
git bisect bad 371d5c0c9e01613d43283b78529418fb609705f3 # 06:54 0- 20 Merge 'kees/lsm/mnt-restrict' into devel-lkp-ib04-smoke-201502150503
git bisect bad 2228b30d2010404a0eb4a1e8e57fe04550dd9708 # 07:14 0- 20 LSM: MntRestrict blocks mounts on symlink targets
# first bad commit: [2228b30d2010404a0eb4a1e8e57fe04550dd9708] LSM: MntRestrict blocks mounts on symlink targets
git bisect good 18320f2a6871aaf2522f793fee4a67eccf5e131a # 07:24 60+ 0 Merge tag 'pm+acpi-3.20-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
# extra tests with DEBUG_INFO
git bisect bad 2228b30d2010404a0eb4a1e8e57fe04550dd9708 # 07:29 0- 60 LSM: MntRestrict blocks mounts on symlink targets
# extra tests on HEAD of linux-devel/devel-lkp-ib04-smoke-201502150503
git bisect bad ea62d88b645bbcc4842e572023dcadc1e83ff66d # 07:29 0- 12 0day head guard for 'devel-lkp-ib04-smoke-201502150503'
# extra tests on tree/branch kees/lsm/mnt-restrict
git bisect bad 2228b30d2010404a0eb4a1e8e57fe04550dd9708 # 07:41 0- 20 LSM: MntRestrict blocks mounts on symlink targets
# extra tests with first bad commit reverted
# extra tests on tree/branch linus/master
git bisect good d347efeb16d3d5150cb7f8d50b05f388b572840e # 07:53 60+ 0 mutex: remove unused field "name" in debug mode
# extra tests on tree/branch next/master
git bisect good b8acf73194186a5cba86812eb4ba17b897f0e13e # 08:01 60+ 60 Add linux-next specific files for 20150213
This script may reproduce the error.
----------------------------------------------------------------------------
#!/bin/bash
kernel=$1
kvm=(
qemu-system-x86_64
-cpu kvm64
-enable-kvm
-kernel $kernel
-m 320
-smp 1
-net nic,vlan=1,model=e1000
-net user,vlan=1
-boot order=nc
-no-reboot
-watchdog i6300esb
-rtc base=localtime
-serial stdio
-display none
-monitor null
)
append=(
hung_task_panic=1
earlyprintk=ttyS0,115200
rd.udev.log-priority=err
systemd.log_target=journal
systemd.log_level=warning
debug
apic=debug
sysrq_always_enabled
rcupdate.rcu_cpu_stall_timeout=100
panic=-1
softlockup_panic=1
nmi_watchdog=panic
oops=panic
load_ramdisk=2
prompt_ramdisk=0
console=ttyS0,115200
console=tty0
vga=normal
root=/dev/ram0
rw
drbd.minor_count=8
)
"${kvm[@]}" --append "${append[*]}"
----------------------------------------------------------------------------
Thanks,
Fengguang
View attachment "dmesg-yocto-client8-9:20150215071338:x86_64-randconfig-ib0-02150501:3.19.0-04761-g2228b30:12" of type "text/plain" (37552 bytes)
View attachment "config-3.19.0-04761-g2228b30" of type "text/plain" (65022 bytes)
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