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selftests/powerpc: skip tests for unavailable mitigations.

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Mitigation patching test iterates over a set of mitigations irrespective
of whether a certain mitigation is supported/available in the kernel.
This causes following messages on a kernel where some mitigations
are unavailable:

  Spawned threads enabling/disabling mitigations ...
  cat: entry_flush: No such file or directory
  cat: uaccess_flush: No such file or directory
  Waiting for timeout ...
  OK

This patch adds a check for available mitigations in the kernel.

Reported-by: Nageswara R Sastry <rnsastry@linux.ibm.com>
Signed-off-by: Sachin Sant <sachinp@linux.vnet.ibm.com>
Tested-by: Nageswara R Sastry <rnsastry@linux.ibm.com>
Reviewed-by: Russell Currey <ruscur@russell.cc>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/163941374362.36967.18016981579099073379.sendpatchset@1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa
This commit is contained in:
Sachin Sant 2021-12-13 22:12:23 +05:30 committed by Michael Ellerman
parent 3b54c71537
commit 1867859184
1 changed files with 4 additions and 1 deletions
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5
tools/testing/selftests/powerpc/security/mitigation-patching.sh
View File

@ -44,7 +44,10 @@ mitigations="barrier_nospec stf_barrier count_cache_flush rfi_flush entry_flush
for m in $mitigations
do
do_one "$m" &
if [[ -f /sys/kernel/debug/powerpc/$m ]]
then
do_one "$m" &
fi
done
echo "Spawned threads enabling/disabling mitigations ..."