[PATCH v3 RESEND 2/2] selftests/mm: Only prepare ptrace_scope when memfd_secret is selected

[Tianyi Chen <diannaaav@gmail.com>]

From: Tianyi Chen <hi@tychen.cc>

The memfd_secret setup clears ptrace_scope whenever its test binary is
executable, even when a different category was selected. run_test() filters
the test invocation, but it does not protect the preceding setup.

Check the category selection before entering the memfd_secret block so
running unrelated categories does not change ptrace_scope. Keep the
existing executable check and the behavior when memfd_secret is selected.

Acked-by: David Hildenbrand (Arm) <david@kernel.org>
Assisted-by: LLM
Signed-off-by: Tianyi Chen <hi@tychen.cc>
---
 tools/testing/selftests/mm/run_vmtests.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/mm/run_vmtests.sh b/tools/testing/selftests/mm/run_vmtests.sh
index 9e62ab4c6775..9bbef9410ccc 100755
--- a/tools/testing/selftests/mm/run_vmtests.sh
+++ b/tools/testing/selftests/mm/run_vmtests.sh
@@ -370,7 +370,7 @@ CATEGORY="process_madv" run_test ./process_madv
 
 CATEGORY="vma_merge" run_test ./merge
 
-if [ -x ./memfd_secret ]
+if test_selected "memfd_secret" && [ -x ./memfd_secret ]
 then
 if [ -f /proc/sys/kernel/yama/ptrace_scope ]; then
 	(echo 0 > /proc/sys/kernel/yama/ptrace_scope 2>&1) | tap_prefix
-- 
2.55.0