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|
#!/usr/bin/env bash
set -euo pipefail
TIMEOUT=10
function do_one
{
local mitigation="$1"
local orig
local start
local now
orig=$(cat "$mitigation")
start=$(date +%s)
now=$start
while [[ $((now-start)) -lt "$TIMEOUT" ]]
do
echo 0 > "$mitigation"
echo 1 > "$mitigation"
now=$(date +%s)
done
echo "$orig" > "$mitigation"
}
rc=0
cd /sys/kernel/debug/powerpc || rc=1
if [[ "$rc" -ne 0 ]]; then
echo "Error: couldn't cd to /sys/kernel/debug/powerpc" >&2
exit 1
fi
tainted=$(cat /proc/sys/kernel/tainted)
if [[ "$tainted" -ne 0 ]]; then
echo "Warning: kernel already tainted! ($tainted)" >&2
fi
mitigations="barrier_nospec stf_barrier count_cache_flush rfi_flush entry_flush uaccess_flush"
for m in $mitigations
do
if [[ -f /sys/kernel/debug/powerpc/$m ]]
then
do_one "$m" &
fi
done
echo "Spawned threads enabling/disabling mitigations ..."
if stress-ng > /dev/null 2>&1; then
stress="stress-ng"
elif stress > /dev/null 2>&1; then
stress="stress"
else
stress=""
fi
if [[ -n "$stress" ]]; then
"$stress" -m "$(nproc)" -t "$TIMEOUT" &
echo "Spawned VM stressors ..."
fi
echo "Waiting for timeout ..."
wait
orig_tainted=$tainted
tainted=$(cat /proc/sys/kernel/tainted)
if [[ "$tainted" != "$orig_tainted" ]]; then
echo "Error: kernel newly tainted, before ($orig_tainted) after ($tainted)" >&2
exit 1
fi
echo "OK"
exit 0
|
