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 <rnsas...@linux.ibm.com> Signed-off-by: Sachin Sant <sach...@linux.vnet.ibm.com> --- diff -Naurp aa/tools/testing/selftests/powerpc/security/mitigation-patching.sh bb/tools/testing/selftests/powerpc/security/mitigation-patching.sh --- aa/tools/testing/selftests/powerpc/security/mitigation-patching.sh 2021-12-13 10:17:05.714127154 -0500 +++ bb/tools/testing/selftests/powerpc/security/mitigation-patching.sh 2021-12-13 10:19:32.575315913 -0500 @@ -44,7 +44,10 @@ mitigations="barrier_nospec stf_barrier 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 ..."
