mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
synced 2025-09-05 11:53:41 +00:00
a8a54a65ca
Currently the mitigation patching test errors out if the kernel is tainted prior to the test running. That causes the test to fail unnecessarily if some other test has caused the kernel to be tainted, or if a proprietary or force module is loaded for example. Instead just warn if the kernel is tainted to begin with, and only report a change in the taint state as an error in the test. Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://patch.msgid.link/20241106130453.1741013-5-mpe@ellerman.id.au
79 lines
1.4 KiB
Bash
Executable File
79 lines
1.4 KiB
Bash
Executable File
#!/usr/bin/env bash
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set -euo pipefail
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TIMEOUT=10
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function do_one
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{
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local mitigation="$1"
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local orig
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local start
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local now
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orig=$(cat "$mitigation")
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start=$(date +%s)
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now=$start
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while [[ $((now-start)) -lt "$TIMEOUT" ]]
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do
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echo 0 > "$mitigation"
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echo 1 > "$mitigation"
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now=$(date +%s)
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done
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echo "$orig" > "$mitigation"
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}
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rc=0
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cd /sys/kernel/debug/powerpc || rc=1
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if [[ "$rc" -ne 0 ]]; then
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echo "Error: couldn't cd to /sys/kernel/debug/powerpc" >&2
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exit 1
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fi
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tainted=$(cat /proc/sys/kernel/tainted)
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if [[ "$tainted" -ne 0 ]]; then
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echo "Warning: kernel already tainted! ($tainted)" >&2
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fi
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mitigations="barrier_nospec stf_barrier count_cache_flush rfi_flush entry_flush uaccess_flush"
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for m in $mitigations
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do
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if [[ -f /sys/kernel/debug/powerpc/$m ]]
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then
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do_one "$m" &
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fi
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done
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echo "Spawned threads enabling/disabling mitigations ..."
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if stress-ng > /dev/null 2>&1; then
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stress="stress-ng"
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elif stress > /dev/null 2>&1; then
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stress="stress"
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else
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stress=""
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fi
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if [[ -n "$stress" ]]; then
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"$stress" -m "$(nproc)" -t "$TIMEOUT" &
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echo "Spawned VM stressors ..."
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fi
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echo "Waiting for timeout ..."
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wait
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orig_tainted=$tainted
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tainted=$(cat /proc/sys/kernel/tainted)
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if [[ "$tainted" != "$orig_tainted" ]]; then
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echo "Error: kernel newly tainted, before ($orig_tainted) after ($tainted)" >&2
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exit 1
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fi
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echo "OK"
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exit 0
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