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selftests/powerpc: Detect taint change in mitigation patching test

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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
This commit is contained in:
Michael Ellerman 2024-11-07 00:04:53 +11:00
parent c6a75555b4
commit a8a54a65ca
1 changed files with 4 additions and 4 deletions
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8
tools/testing/selftests/powerpc/security/mitigation-patching.sh
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@ -36,8 +36,7 @@ fi
tainted=$(cat /proc/sys/kernel/tainted)
if [[ "$tainted" -ne 0 ]]; then
echo "Error: kernel already tainted!" >&2
exit 1
echo "Warning: kernel already tainted! ($tainted)" >&2
fi
mitigations="barrier_nospec stf_barrier count_cache_flush rfi_flush entry_flush uaccess_flush"
@ -68,9 +67,10 @@ fi
echo "Waiting for timeout ..."
wait
orig_tainted=$tainted
tainted=$(cat /proc/sys/kernel/tainted)
if [[ "$tainted" -ne 0 ]]; then
echo "Error: kernel became tainted!" >&2
if [[ "$tainted" != "$orig_tainted" ]]; then
echo "Error: kernel newly tainted, before ($orig_tainted) after ($tainted)" >&2
exit 1
fi