Commit 149538cd authored by Kees Cook's avatar Kees Cook Committed by Greg Kroah-Hartman
Browse files

selftests/lkdtm: Add way to repeat a test 



Some LKDTM tests need to be run more than once (usually to setup and
then later trigger). Until now, the only case was the SOFT_LOCKUP test,
which wasn't useful to run in the bulk selftests. The coming stack canary
checking needs to run twice, so support this with a new test output prefix
"repeat".

Signed-off-by: default avatarKees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20211022223826.330653-2-keescook@chromium.org


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 0e53a9e0

tools/testing/selftests/lkdtm/run.sh

+9 −1
Original line number Diff line number Diff line
@@ -56,8 +56,14 @@ if echo "$test" | grep -q '^#' ; then 
fi



# If no expected output given, assume an Oops with back trace is success.

repeat=1

if [ -z "$expect" ]; then

	expect="call trace:"

else

	if echo "$expect" | grep -q '^repeat:' ; then

		repeat=$(echo "$expect" | cut -d' ' -f1 | cut -d: -f2)

		expect=$(echo "$expect" | cut -d' ' -f2-)

	fi

fi



# Prepare log for report checking
@@ -83,7 +89,9 @@ dmesg > "$DMESG" 
# the signal that killed the subprocess, we must ignore the failure and

# continue. However we don't silence stderr since there might be other

# useful details reported there in the case of other unexpected conditions.

for i in $(seq 1 $repeat); do

	echo "$test" | cat >"$TRIGGER" || true

done



# Record and dump the results

dmesg | comm --nocheck-order -13 "$DMESG" - > "$LOG" || true