Raspberry Piで CPUの脆弱性 Spectreと Meltdownの脆弱性をチェックする方法 (ラズパイで 2018年初頭に大騒ぎになったスペクターとメルトダウンの CPUの脆弱性をチェックする方法)

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・2018/08/24

Raspberry Piで CPUの脆弱性 Spectreと Meltdownの脆弱性をチェックする方法

(ラズパイで 2018年初頭に大騒ぎになったスペクターとメルトダウンの CPUの脆弱性をチェックする方法)

Tags: [Raspberry Pi], [電子工作]

● Raspberry Piで Spectreと Meltdownの脆弱性をチェックする方法

　Raspberry Piで 2018年 1月に大騒ぎになった CPUの脆弱性 Spectreと Meltdownの脆弱性をチェックする方法です。

●今回動かした Raspberry Pi Raspbian OSのバージョン

　RASPBIAN STRETCH WITH DESKTOP
　Version:June 2018
　Release date: 2018-06-27
　Kernel version: 4.14

pi@raspberrypi:~/pytorch $ uname -a
Linux raspberrypi 4.14.50-v7+ #1122 SMP Tue Jun 19 12:26:26 BST 2018 armv7l GNU/Linux

● Raspberry Piで Spectreと Meltdownの脆弱性をチェックする方法

speed47/spectre-meltdown-checker
　Spectre & Meltdown vulnerability/mitigation checker for Linux
　Spectre & Meltdown Checker

# お決まりの sudo apt-get updateで最新状態に更新する
sudo apt-get update

# Spectre and Meltdown Checkerをダウンロードする
cd
wget https://meltdown.ovh -O spectre-meltdown-checker.sh

# Spectre and Meltdown Checkerを実行する
chmod +x spectre-meltdown-checker.sh
sudo ./spectre-meltdown-checker.sh

● Raspberry Pi 3Bでの Spectre & Meltdown Checkerの実行結果

pi@raspberrypi:~ $ cat /proc/cpuinfo
processor       : 0
model name      : ARMv7 Processor rev 4 (v7l)
BogoMIPS        : 76.80
Features        : half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt vfpd32 lpae evtstrm crc32
CPU implementer : 0x41
CPU architecture: 7
CPU variant     : 0x0
CPU part        : 0xd03
CPU revision    : 4

processor       : 1
model name      : ARMv7 Processor rev 4 (v7l)
BogoMIPS        : 76.80
Features        : half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt vfpd32 lpae evtstrm crc32
CPU implementer : 0x41
CPU architecture: 7
CPU variant     : 0x0
CPU part        : 0xd03
CPU revision    : 4

processor       : 2
model name      : ARMv7 Processor rev 4 (v7l)
BogoMIPS        : 76.80
Features        : half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt vfpd32 lpae evtstrm crc32
CPU implementer : 0x41
CPU architecture: 7
CPU variant     : 0x0
CPU part        : 0xd03
CPU revision    : 4

processor       : 3
model name      : ARMv7 Processor rev 4 (v7l)
BogoMIPS        : 76.80
Features        : half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt vfpd32 lpae evtstrm crc32
CPU implementer : 0x41
CPU architecture: 7
CPU variant     : 0x0
CPU part        : 0xd03
CPU revision    : 4

Hardware        : BCM2835
Revision        : a22082
Serial          : 00000000xxxxxxxx

pi@raspberrypi:~ $ wget https://meltdown.ovh -O spectre-meltdown-checker.sh
--2018-08-22 08:30:51--  https://meltdown.ovh/
Resolving meltdown.ovh (meltdown.ovh)... 87.98.135.28
Connecting to meltdown.ovh (meltdown.ovh)|87.98.135.28|:443... connected.
HTTP request sent, awaiting response... 302 Moved Temporarily
Location: https://raw.githubusercontent.com/speed47/spectre-meltdown-checker/master/spectre-meltdown-checker.sh [following]
--2018-08-22 08:30:52--  https://raw.githubusercontent.com/speed47/spectre-meltdown-checker/master/spectre-meltdown-checker.sh
Resolving raw.githubusercontent.com (raw.githubusercontent.com)... 151.101.72.133
Connecting to raw.githubusercontent.com (raw.githubusercontent.com)|151.101.72.133|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 127398 (124K) [text/plain]
Saving to: ‘spectre-meltdown-checker.sh’

spectre-meltdown-ch 100%[===================>] 124.41K  --.-KB/s    in 0.06s

2018-08-22 08:30:53 (2.12 MB/s) - ‘spectre-meltdown-checker.sh’ saved [127398/127398]

pi@raspberrypi:~ $ chmod +x spectre-meltdown-checker.sh
pi@raspberrypi:~ $ sudo ./spectre-meltdown-checker.sh
Spectre and Meltdown mitigation detection tool v0.39+

Checking for vulnerabilities on current system
Kernel is Linux 4.14.50-v7+ #1122 SMP Tue Jun 19 12:26:26 BST 2018 armv7l
CPU is ARM v7 model 0xd03
We're missing some kernel info (see -v), accuracy might be reduced

Hardware check
* CPU vulnerability to the speculative execution attack variants
  * Vulnerable to Variant 1:  NO
  * Vulnerable to Variant 2:  NO
  * Vulnerable to Variant 3:  NO
  * Vulnerable to Variant 3a:  NO
  * Vulnerable to Variant 4:  NO
  * Vulnerable to Variant l1tf:  NO

CVE-2017-5753 [bounds check bypass] aka 'Spectre Variant 1'
* Kernel has array_index_mask_nospec:  UNKNOWN  (couldn't check (couldn't find your kernel image in /boot, if you used netboot, this is normal))
* Kernel has the Red Hat/Ubuntu patch:  UNKNOWN  (couldn't check (couldn't find your kernel image in /boot, if you used netboot, this is normal))
* Kernel has mask_nospec64 (arm64):  UNKNOWN  (couldn't check (couldn't find your kernel image in /boot, if you used netboot, this is normal))
* Checking count of LFENCE instructions following a jump in kernel...  UNKNOWN  (couldn't check (couldn't find your kernel image in /boot, if you used netboot, this is normal))
> STATUS:  NOT VULNERABLE  (your CPU vendor reported your CPU model as not vulnerable)

CVE-2017-5715 [branch target injection] aka 'Spectre Variant 2'
* Mitigation 1
  * Kernel is compiled with IBRS support:  YES
    * IBRS enabled and active:  NO
  * Kernel is compiled with IBPB support:  UNKNOWN  (in offline mode, we need the kernel image to be able to tell)
    * IBPB enabled and active:  NO
* Mitigation 2
  * Kernel has branch predictor hardening (arm):  NO
  * Kernel compiled with retpoline option:  UNKNOWN  (couldn't read your kernel configuration)
> STATUS:  NOT VULNERABLE  (your CPU vendor reported your CPU model as not vulnerable)

CVE-2017-5754 [rogue data cache load] aka 'Meltdown' aka 'Variant 3'
* Kernel supports Page Table Isolation (PTI):  NO
  * PTI enabled and active:  NO
  * Reduced performance impact of PTI:  NO  (PCID/INVPCID not supported, performance impact of PTI will be significant)
* Running as a Xen PV DomU:  NO
> STATUS:  NOT VULNERABLE  (your CPU vendor reported your CPU model as not vulnerable)

CVE-2018-3640 [rogue system register read] aka 'Variant 3a'
* CPU microcode mitigates the vulnerability:  NO
> STATUS:  NOT VULNERABLE  (your CPU vendor reported your CPU model as not vulnerable)

CVE-2018-3639 [speculative store bypass] aka 'Variant 4'
* Kernel supports speculation store bypass:  YES  (found in /proc/self/status)
> STATUS:  NOT VULNERABLE  (your CPU vendor reported your CPU model as not vulnerable)

CVE-2018-3615/3620/3646 [L1 terminal fault] aka 'Foreshadow & Foreshadow-NG'
> STATUS:  NOT VULNERABLE  (your CPU vendor reported your CPU model as not vulnerable)

Need more detailed information about mitigation options? Use --explain
A false sense of security is worse than no security at all, see --disclaimer

● Raspberry Pi 3B+での Spectre & Meltdown Checkerの実行結果

Spectre and Meltdown mitigation detection tool v0.40

pi@raspberrypi:~ $ # Spectre and Meltdown Checkerを実行する
pi@raspberrypi:~ $ chmod +x spectre-meltdown-checker.sh
pi@raspberrypi:~ $ sudo ./spectre-meltdown-checker.sh
Spectre and Meltdown mitigation detection tool v0.40

Checking for vulnerabilities on current system
Kernel is Linux 4.14.98-v7+ #1200 SMP Tue Feb 12 20:27:48 GMT 2019 armv7l
CPU is ARM v7 model 0xd03
We're missing some kernel info (see -v), accuracy might be reduced

Hardware check
* CPU vulnerability to the speculative execution attack variants
  * Vulnerable to CVE-2017-5753 (Spectre Variant 1, bounds check bypass):  NO
  * Vulnerable to CVE-2017-5715 (Spectre Variant 2, branch target injection):  NO
  * Vulnerable to CVE-2017-5754 (Variant 3, Meltdown, rogue data cache load):  NO
  * Vulnerable to CVE-2018-3640 (Variant 3a, rogue system register read):  NO
  * Vulnerable to CVE-2018-3639 (Variant 4, speculative store bypass):  NO
  * Vulnerable to CVE-2018-3615 (Foreshadow (SGX), L1 terminal fault):  NO
  * Vulnerable to CVE-2018-3620 (Foreshadow-NG (OS), L1 terminal fault):  NO
  * Vulnerable to CVE-2018-3646 (Foreshadow-NG (VMM), L1 terminal fault):  NO

CVE-2017-5753 aka 'Spectre Variant 1, bounds check bypass'
* Kernel has array_index_mask_nospec:  NO
* Kernel has the Red Hat/Ubuntu patch:  NO
* Kernel has mask_nospec64 (arm64):  NO
* Checking count of LFENCE instructions following a jump in kernel...  NO  (only 0 jump-then-lfence instructions found, should be >= 30 (heuristic))
> STATUS:  NOT VULNERABLE  (your CPU vendor reported your CPU model as not vulnerable)

CVE-2017-5715 aka 'Spectre Variant 2, branch target injection'
* Mitigation 1
  * Kernel is compiled with IBRS support:  YES
    * IBRS enabled and active:  NO
  * Kernel is compiled with IBPB support:  NO
    * IBPB enabled and active:  NO
* Mitigation 2
  * Kernel has branch predictor hardening (arm):  NO
  * Kernel compiled with retpoline option:  UNKNOWN  (couldn't read your kernel configuration)
> STATUS:  NOT VULNERABLE  (your CPU vendor reported your CPU model as not vulnerable)

CVE-2017-5754 aka 'Variant 3, Meltdown, rogue data cache load'
* Kernel supports Page Table Isolation (PTI):  NO
  * PTI enabled and active:  NO
  * Reduced performance impact of PTI:  NO  (PCID/INVPCID not supported, performance impact of PTI will be significant)
* Running as a Xen PV DomU:  NO
> STATUS:  NOT VULNERABLE  (your CPU vendor reported your CPU model as not vulnerable)

CVE-2018-3640 aka 'Variant 3a, rogue system register read'
* CPU microcode mitigates the vulnerability:  NO
> STATUS:  NOT VULNERABLE  (your CPU vendor reported your CPU model as not vulnerable)

CVE-2018-3639 aka 'Variant 4, speculative store bypass'
* Kernel supports disabling speculative store bypass (SSB):  YES  (found in /proc/self/status)
* SSB mitigation is enabled and active: > STATUS:  NOT VULNERABLE  (your CPU vendor reported your CPU model as not vulnerable)

CVE-2018-3615 aka 'Foreshadow (SGX), L1 terminal fault'
* CPU microcode mitigates the vulnerability:  N/A
> STATUS:  NOT VULNERABLE  (your CPU vendor reported your CPU model as not vulnerable)

CVE-2018-3620 aka 'Foreshadow-NG (OS), L1 terminal fault'
* Kernel supports PTE inversion:  NO
* PTE inversion enabled and active:  UNKNOWN  (sysfs interface not available)
> STATUS:  NOT VULNERABLE  (your CPU vendor reported your CPU model as not vulnerable)

CVE-2018-3646 aka 'Foreshadow-NG (VMM), L1 terminal fault'
* This system is a host running a hypervisor:  NO
* Mitigation 1 (KVM)
  * EPT is disabled:  N/A  (the kvm_intel module is not loaded)
* Mitigation 2
  * L1D flush is supported by kernel:  NO
  * L1D flush enabled:  UNKNOWN  (can't find or read /sys/devices/system/cpu/vulnerabilities/l1tf)
  * Hardware-backed L1D flush supported:  NO  (flush will be done in software, this is slower)
  * Hyper-Threading (SMT) is enabled:  UNKNOWN
> STATUS:  NOT VULNERABLE  (your CPU vendor reported your CPU model as not vulnerable)

> SUMMARY: CVE-2017-5753:OK CVE-2017-5715:OK CVE-2017-5754:OK CVE-2018-3640:OK CVE-2018-3639:OK CVE-2018-3615:OK CVE-2018-3620:OK CVE-2018-3646:OK

We're missing some kernel info (see -v), accuracy might be reduced
Need more detailed information about mitigation options? Use --explain
A false sense of security is worse than no security at all, see --disclaimer

pi@raspberrypi:~ $ cat /proc/cpuinfo
processor       : 0
model name      : ARMv7 Processor rev 4 (v7l)
BogoMIPS        : 38.40
Features        : half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt vfpd32 lpae evtstrm crc32
CPU implementer : 0x41
CPU architecture: 7
CPU variant     : 0x0
CPU part        : 0xd03
CPU revision    : 4

processor       : 1
model name      : ARMv7 Processor rev 4 (v7l)
BogoMIPS        : 38.40
Features        : half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt vfpd32 lpae evtstrm crc32
CPU implementer : 0x41
CPU architecture: 7
CPU variant     : 0x0
CPU part        : 0xd03
CPU revision    : 4

processor       : 2
model name      : ARMv7 Processor rev 4 (v7l)
BogoMIPS        : 38.40
Features        : half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt vfpd32 lpae evtstrm crc32
CPU implementer : 0x41
CPU architecture: 7
CPU variant     : 0x0
CPU part        : 0xd03
CPU revision    : 4

processor       : 3
model name      : ARMv7 Processor rev 4 (v7l)
BogoMIPS        : 38.40
Features        : half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt vfpd32 lpae evtstrm crc32
CPU implementer : 0x41
CPU architecture: 7
CPU variant     : 0x0
CPU part        : 0xd03
CPU revision    : 4

Hardware        : BCM2835
Revision        : a020d3
Serial          : 000000000xxxxxxx

Spectre and Meltdown mitigation detection tool v0.39+

pi@raspberrypi:~ $ wget https://meltdown.ovh -O spectre-meltdown-checker.sh
--2018-08-24 13:50:29--  https://meltdown.ovh/
Resolving meltdown.ovh (meltdown.ovh)... 87.98.135.28
Connecting to meltdown.ovh (meltdown.ovh)|87.98.135.28|:443... connected.
HTTP request sent, awaiting response... 302 Moved Temporarily
Location: https://raw.githubusercontent.com/speed47/spectre-meltdown-checker/master/spectre-meltdown-checker.sh [following]
--2018-08-24 13:50:30--  https://raw.githubusercontent.com/speed47/spectre-meltdown-checker/master/spectre-meltdown-checker.sh
Resolving raw.githubusercontent.com (raw.githubusercontent.com)... 151.101.72.133
Connecting to raw.githubusercontent.com (raw.githubusercontent.com)|151.101.72.133|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 127398 (124K) [text/plain]
Saving to: ‘spectre-meltdown-checker.sh’

spectre-meltdown-ch 100%[===================>] 124.41K  --.-KB/s    in 0.03s

2018-08-24 13:50:31 (3.96 MB/s) - ‘spectre-meltdown-checker.sh’ saved [127398/127398]

pi@raspberrypi:~ $ chmod +x spectre-meltdown-checker.sh
pi@raspberrypi:~ $ sudo ./spectre-meltdown-checker.sh
Spectre and Meltdown mitigation detection tool v0.39+

Checking for vulnerabilities on current system
Kernel is Linux 4.14.50-v7+ #1122 SMP Tue Jun 19 12:26:26 BST 2018 armv7l
CPU is ARM v7 model 0xd03
We're missing some kernel info (see -v), accuracy might be reduced

Hardware check
* CPU vulnerability to the speculative execution attack variants
  * Vulnerable to Variant 1:  NO
  * Vulnerable to Variant 2:  NO
  * Vulnerable to Variant 3:  NO
  * Vulnerable to Variant 3a:  NO
  * Vulnerable to Variant 4:  NO
  * Vulnerable to Variant l1tf:  NO

CVE-2017-5753 [bounds check bypass] aka 'Spectre Variant 1'
* Kernel has array_index_mask_nospec:  UNKNOWN  (couldn't check (couldn't find your kernel image in /boot, if you used netboot, this is normal))
* Kernel has the Red Hat/Ubuntu patch:  UNKNOWN  (couldn't check (couldn't find your kernel image in /boot, if you used netboot, this is normal))
* Kernel has mask_nospec64 (arm64):  UNKNOWN  (couldn't check (couldn't find your kernel image in /boot, if you used netboot, this is normal))
* Checking count of LFENCE instructions following a jump in kernel...  UNKNOWN  (couldn't check (couldn't find your kernel image in /boot, if you used netboot, this is normal))
> STATUS:  NOT VULNERABLE  (your CPU vendor reported your CPU model as not vulnerable)

CVE-2017-5715 [branch target injection] aka 'Spectre Variant 2'
* Mitigation 1
  * Kernel is compiled with IBRS support:  YES
    * IBRS enabled and active:  NO
  * Kernel is compiled with IBPB support:  UNKNOWN  (in offline mode, we need the kernel image to be able to tell)
    * IBPB enabled and active:  NO
* Mitigation 2
  * Kernel has branch predictor hardening (arm):  NO
  * Kernel compiled with retpoline option:  UNKNOWN  (couldn't read your kernel configuration)
> STATUS:  NOT VULNERABLE  (your CPU vendor reported your CPU model as not vulnerable)

CVE-2017-5754 [rogue data cache load] aka 'Meltdown' aka 'Variant 3'
* Kernel supports Page Table Isolation (PTI):  NO
  * PTI enabled and active:  NO
  * Reduced performance impact of PTI:  NO  (PCID/INVPCID not supported, performance impact of PTI will be significant)
* Running as a Xen PV DomU:  NO
> STATUS:  NOT VULNERABLE  (your CPU vendor reported your CPU model as not vulnerable)

CVE-2018-3640 [rogue system register read] aka 'Variant 3a'
* CPU microcode mitigates the vulnerability:  NO
> STATUS:  NOT VULNERABLE  (your CPU vendor reported your CPU model as not vulnerable)

CVE-2018-3639 [speculative store bypass] aka 'Variant 4'
* Kernel supports speculation store bypass:  YES  (found in /proc/self/status)
> STATUS:  NOT VULNERABLE  (your CPU vendor reported your CPU model as not vulnerable)

CVE-2018-3615/3620/3646 [L1 terminal fault] aka 'Foreshadow & Foreshadow-NG'
> STATUS:  NOT VULNERABLE  (your CPU vendor reported your CPU model as not vulnerable)

Need more detailed information about mitigation options? Use --explain
A false sense of security is worse than no security at all, see --disclaimer

● RASPBERRY PI CPU REVISION CODES
RASPBERRY PI REVISION CODES

cat /proc/cpuinfo

Hardware    : BCM2835
Revision    : a02082
Serial      : 00000000765fc593

Code	Model	Revision	RAM	Manufacturer
a22082	3B	1.2	1 GB	Embest（China）
a32082	3B	1.2	1 GB	Sony Japan
a52082	3B	1.2	1 GB	Stadium（UK）
a020d3	3B+	1.3	1 GB	Sony UK

・Raspberry Piで Spectreと Meltdownの CPUの脆弱性をチェックする方法

Tags: [Raspberry Pi], [電子工作]

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