Hi,
under Debian Stretch i have updated the Microcode from Intel
<https://downloadcenter.intel.com/download/27591/Linux-Processor-Microcode-Data-File?v=t>
according to the readme
<http://metadata.ftp-master.debian.org/changelogs/non-free/i/intel-microcode/unstable_README.Debian>
instructions.
~# dmesg | grep micro
[ 0.000000] microcode: microcode updated early to revision 0x24, date
= 2018-01-21
[ 0.640195] microcode: sig=0x306c3, pf=0x2, revision=0x24
[ 0.640313] microcode: Microcode Update Driver: v2.2.
With a vanilla kernel compiled with Meltdown/Spectre
mitigations, i get with spectre-meltdown-checker v0.35:
Kernel is Linux 4.15.8-vanilla1 #1 SMP Sat Mar 10 18:53:16 CET 2018 x86_64
CPU is Intel(R) Core(TM) i5-4570 CPU @ 3.20GHz
Hardware check
* Hardware support (CPU microcode) for mitigation techniques
* Indirect Branch Restricted Speculation (IBRS)
* SPEC_CTRL MSR is available: YES
* CPU indicates IBRS capability: YES (SPEC_CTRL feature bit)
* Indirect Branch Prediction Barrier (IBPB)
* PRED_CMD MSR is available: YES
* CPU indicates IBPB capability: YES (SPEC_CTRL feature bit)
* Single Thread Indirect Branch Predictors (STIBP)
* SPEC_CTRL MSR is available: YES
* CPU indicates STIBP capability: YES
* 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 microcode is known to cause stability problems: NO (model 60
stepping 3 ucode 0x24)
* 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: YES (kernel confirms that
the mitigation is active)
* Kernel has array_index_mask_nospec: YES (1 occurence(s) found of 64
bits array_index_mask_nospec())
* Kernel has the Red Hat/Ubuntu patch: NO
> STATUS: NOT VULNERABLE (Mitigation: __user pointer sanitization)
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)
> STATUS: NOT VULNERABLE (Mitigation: Full generic retpoline, IBPB)
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)
~# cat /poc/cpuinfo | grep flags
flags: ... ibpb ibrs stibp ...
No problems or performance losses so far.
--
mlnl
