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fix: has_vmm: ignore kernel threads when looking for a hypervisor (fixes #278)

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Stéphane Lesimple 2019-12-09 23:17:37 +01:00
parent a343bccb49
commit 5633d374de
1 changed files with 16 additions and 4 deletions
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20
spectre-meltdown-checker.sh
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@ -3051,10 +3051,22 @@ check_has_vmm()
if command -v pgrep >/dev/null 2>&1; then
# remove xenbus and xenwatch, also present inside domU
# remove libvirtd as it can also be used to manage containers and not VMs
if pgrep qemu >/dev/null || pgrep kvm >/dev/null || \
pgrep xenstored >/dev/null || pgrep xenconsoled >/dev/null; then
has_vmm=1
fi
# for each binary we want to grep, get the pids
for _binary in qemu kvm xenstored xenconsoled
do
for _pid in $(pgrep $_binary)
do
# resolve the exe symlink, if it doesn't resolve with -m,
# which doesn't even need the dest to exist, it means the symlink
# is null, which is the case for kernel threads: ignore those to
# avoid false positives (such as [kvm-irqfd-clean] under at least RHEL 7.6/7.7)
if ! [ "$(readlink -m "/proc/$_pid/exe")" = "/proc/$_pid/exe" ]; then
_debug "has_vmm: found PID $_pid"
has_vmm=1
fi
done
done
unset _binary _pid
else
# ignore SC2009 as `ps ax` is actually used as a fallback if `pgrep` isn't installed
# shellcheck disable=SC2009