Commit 18678591 authored by Sachin Sant's avatar Sachin Sant Committed by Michael Ellerman
Browse files

selftests/powerpc: skip tests for unavailable mitigations. 



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: default avatarNageswara R Sastry <rnsastry@linux.ibm.com>
Signed-off-by: default avatarSachin Sant <sachinp@linux.vnet.ibm.com>
Tested-by: default avatarNageswara R Sastry <rnsastry@linux.ibm.com>
Reviewed-by: default avatarRussell Currey <ruscur@russell.cc>
Signed-off-by: default avatarMichael 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
parent 3b54c715

tools/testing/selftests/powerpc/security/mitigation-patching.sh

+4 −1
Original line number Diff line number Diff line
@@ -44,7 +44,10 @@ mitigations="barrier_nospec stf_barrier count_cache_flush rfi_flush entry_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 ..."