forgot to mention that the latest microcode update was a rollback of previous updates:) more info you can find there: https://access.redhat.com/errata/RHSA-2018:0093 Am 26.01.2018 10:50 vorm. schrieb "Gianluca Cecchi" < gianluca.cecchi@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@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@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@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@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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