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IBRS kernel reported active even if sysfs has "IBRS_FW" only (#275) (#276)

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On a (pre-SkyLake) system, where /sys/.../vulnerabilities/spectre_v2 is
"Mitigation: Full generic retpoline, IBPB: conditional, IBRS_FW, RSB filling"

the tool, incorrectly, reports, a couple of lines above:
* IBRS enabled and active:  YES  (for kernel and firmware code)

Use '\<IBRS\>', as suggested by @jirislaby, in upstream issue #275
(https://github.com/speed47/spectre-meltdown-checker/issues/275) when
checking whether IBRS is enabled/active for the kernel.

With that, the output becomes:
* IBRS enabled and active:  YES  (for firmware code only)

which is actually the case.

I double checked that, if the same kernel is used on a post-SkyLake
hardware, which on openSUSE uses IBRS as, even with this change, the
tool (this time correctly) reports:
* IBRS enabled and active:  YES  (for kernel and firmware code)
This commit is contained in:
Dario Faggioli 2019-04-20 14:04:29 +02:00 committed by Stéphane Lesimple
parent 23e7db044e
commit c4bae6ee6a
1 changed files with 1 additions and 1 deletions
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2
spectre-meltdown-checker.sh
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@ -2696,7 +2696,7 @@ check_CVE_2017_5715_linux()
ibrs_fw_enabled=1
fi
# when IBRS is enabled on 4.15+, we can see it in sysfs
if grep -q -e 'IBRS' -e 'Indirect Branch Restricted Speculation' "/sys/devices/system/cpu/vulnerabilities/spectre_v2"; then
if grep -q -e '\<IBRS\>' -e 'Indirect Branch Restricted Speculation' "/sys/devices/system/cpu/vulnerabilities/spectre_v2"; then
_debug "ibrs: found IBRS in sysfs"
[ -z "$ibrs_supported" ] && ibrs_supported='found IBRS in sysfs'
[ -z "$ibrs_enabled" ] && ibrs_enabled=3