[PATCH]selftests/powerpc: skip tests for unavailable mitigations.

[Nageswara Sastry]

On 13/12/21 10:12 pm, Sachin Sant wrote:
> 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 at linux.ibm.com>
> Signed-off-by: Sachin Sant <sachinp at linux.vnet.ibm.com>

Tested-by: Nageswara R Sastry <rnsastry at linux.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 ..."

-- 
Thanks and Regards
R.Nageswara Sastry