[ovirt-users] oVirt 4.1.9 and Spectre-Meltdown checks
Arman Khalatyan
arm2arm at gmail.com
Fri Jan 26 10:24:39 UTC 2018
you should download microcode from the intel web page and overwrite the
/lib/firmware/intel-ucode or so...please check the readme.
Am 26.01.2018 10:50 vorm. schrieb "Gianluca Cecchi" <
gianluca.cecchi at gmail.com>:
Hello,
nice to see integration of Spectre-Meltdown info in 4.1.9, both for guests
and hosts, as detailed in release notes:
I have upgraded my CentOS 7.4 engine VM (outside of oVirt cluster) and one
oVirt host to 4.1.9.
Now in General -> Software subtab of the host I see:
OS Version: RHEL - 7 - 4.1708.el7.centos
OS Description: CentOS Linux 7 (Core)
Kernel Version: 3.10.0 - 693.17.1.el7.x86_64
Kernel Features: IBRS: 0, PTI: 1, IBPB: 0
Am I supposed to manually set any particular value?
If I run version 0.32 (updated yesterday) of spectre-meltdown-checker.sh I
got this on my Dell M610 blade with
Version: 6.4.0
Release Date: 07/18/2013
[root at ov200 ~]# /home/g.cecchi/spectre-meltdown-checker.sh
Spectre and Meltdown mitigation detection tool v0.32
Checking for vulnerabilities on current system
Kernel is Linux 3.10.0-693.17.1.el7.x86_64 #1 SMP Thu Jan 25 20:13:58 UTC
2018 x86_64
CPU is Intel(R) Xeon(R) CPU X5690 @ 3.47GHz
Hardware check
* Hardware support (CPU microcode) for mitigation techniques
* Indirect Branch Restricted Speculation (IBRS)
* SPEC_CTRL MSR is available: NO
* CPU indicates IBRS capability: NO
* Indirect Branch Prediction Barrier (IBPB)
* PRED_CMD MSR is available: NO
* CPU indicates IBPB capability: NO
* Single Thread Indirect Branch Predictors (STIBP)
* SPEC_CTRL MSR is available: NO
* CPU indicates STIBP capability: NO
* Enhanced IBRS (IBRS_ALL)
* CPU indicates ARCH_CAPABILITIES MSR availability: NO
* ARCH_CAPABILITIES MSR advertises IBRS_ALL capability: NO
* CPU explicitly indicates not being vulnerable to Meltdown (RDCL_NO):
NO
* CPU vulnerability to the three speculative execution attacks variants
* Vulnerable to Variant 1: YES
* Vulnerable to Variant 2: YES
* Vulnerable to Variant 3: YES
CVE-2017-5753 [bounds check bypass] aka 'Spectre Variant 1'
* Checking count of LFENCE opcodes in kernel: YES
> STATUS: NOT VULNERABLE (107 opcodes found, which is >= 70, heuristic to
be improved when official patches become available)
CVE-2017-5715 [branch target injection] aka 'Spectre Variant 2'
* Mitigation 1
* Kernel is compiled with IBRS/IBPB support: YES
* Currently enabled features
* IBRS enabled for Kernel space: NO (echo 1 >
/sys/kernel/debug/x86/ibrs_enabled)
* IBRS enabled for User space: NO (echo 2 >
/sys/kernel/debug/x86/ibrs_enabled)
* IBPB enabled: NO (echo 1 > /sys/kernel/debug/x86/ibpb_enabled)
* Mitigation 2
* Kernel compiled with retpoline option: NO
* Kernel compiled with a retpoline-aware compiler: NO
* Retpoline enabled: NO
> STATUS: VULNERABLE (IBRS hardware + kernel support OR kernel with
retpoline are needed to mitigate the vulnerability)
CVE-2017-5754 [rogue data cache load] aka 'Meltdown' aka 'Variant 3'
* Kernel supports Page Table Isolation (PTI): YES
* PTI enabled and active: YES
* Running as a Xen PV DomU: NO
> STATUS: NOT VULNERABLE (PTI mitigates the vulnerability)
A false sense of security is worse than no security at all, see --disclaimer
[root at ov200 ~]#
So it seems I'm still vulnerable only to Variant 2, but kernel seems ok:
* Kernel is compiled with IBRS/IBPB support: YES
while bios not, correct?
Is RH EL / CentOS expected to follow the retpoline option too, to mitigate
Variant 2, as done by Fedora for example?
Eg on my just updated Fedora 27 laptop I get now:
[g.cecchi at ope46 spectre_meltdown]$ sudo ./spectre-meltdown-checker.sh
[sudo] password for g.cecchi:
Spectre and Meltdown mitigation detection tool v0.32
Checking for vulnerabilities on current system
Kernel is Linux 4.14.14-300.fc27.x86_64 #1 SMP Fri Jan 19 13:19:54 UTC 2018
x86_64
CPU is Intel(R) Core(TM) i7-2620M CPU @ 2.70GHz
Hardware check
* Hardware support (CPU microcode) for mitigation techniques
* Indirect Branch Restricted Speculation (IBRS)
* SPEC_CTRL MSR is available: NO
* CPU indicates IBRS capability: NO
* Indirect Branch Prediction Barrier (IBPB)
* PRED_CMD MSR is available: NO
* CPU indicates IBPB capability: NO
* Single Thread Indirect Branch Predictors (STIBP)
* SPEC_CTRL MSR is available: NO
* CPU indicates STIBP capability: NO
* Enhanced IBRS (IBRS_ALL)
* CPU indicates ARCH_CAPABILITIES MSR availability: NO
* ARCH_CAPABILITIES MSR advertises IBRS_ALL capability: NO
* CPU explicitly indicates not being vulnerable to Meltdown (RDCL_NO):
NO
* CPU vulnerability to the three speculative execution attacks variants
* Vulnerable to Variant 1: YES
* Vulnerable to Variant 2: YES
* Vulnerable to Variant 3: YES
CVE-2017-5753 [bounds check bypass] aka 'Spectre Variant 1'
* Mitigated according to the /sys interface: NO (kernel confirms your
system is vulnerable)
> STATUS: VULNERABLE (Vulnerable)
CVE-2017-5715 [branch target injection] aka 'Spectre Variant 2'
* Mitigated according to the /sys interface: YES (kernel confirms that
the mitigation is active)
* Mitigation 1
* Kernel is compiled with IBRS/IBPB support: NO
* Currently enabled features
* IBRS enabled for Kernel space: NO
* IBRS enabled for User space: NO
* IBPB enabled: NO
* Mitigation 2
* Kernel compiled with retpoline option: YES
* Kernel compiled with a retpoline-aware compiler: YES (kernel reports
full retpoline compilation)
* Retpoline enabled: YES
> STATUS: NOT VULNERABLE (Mitigation: Full generic retpoline)
CVE-2017-5754 [rogue data cache load] aka 'Meltdown' aka 'Variant 3'
* Mitigated according to the /sys interface: YES (kernel confirms that
the mitigation is active)
* Kernel supports Page Table Isolation (PTI): YES
* PTI enabled and active: YES
* Running as a Xen PV DomU: NO
> STATUS: NOT VULNERABLE (Mitigation: PTI)
A false sense of security is worse than no security at all, see --disclaimer
[g.cecchi at ope46 spectre_meltdown]$
BTW: I updated some days ago this laptop from F26 to F27 and I remember
Variant 1 was fixed in F26, while now I see it as vulnerable..... I'm going
to check with Fedora mailing list about this...
Another question: what should I see for a VM instead related to
meltdown/spectre?
Currently in "Guest CPU Type" in General subtab of the VM I only see
"Westmere"..
Should I also see anythin aout IBRS, etc...?
Thanks,
Gianluca
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