+ selftests-mm-reject-invalid-test-selections-before-running-tests.patch added to mm-new branch

+ selftests-mm-reject-invalid-test-selections-before-running-tests.patch added to mm-new branch

[Andrew Morton]

The patch titled
     Subject: selftests/mm: reject invalid test selections before running tests
has been added to the -mm mm-new branch.  Its filename is
     selftests-mm-reject-invalid-test-selections-before-running-tests.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/selftests-mm-reject-invalid-test-selections-before-running-tests.patch

This patch will later appear in the mm-new branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Note, mm-new is a provisional staging ground for work-in-progress
patches, and acceptance into mm-new is a notification for others take
notice and to finish up reviews.  Please do not hesitate to respond to
review feedback and post updated versions to replace or incrementally
fixup patches in mm-new.

The mm-new branch of mm.git is not included in linux-next

If a few days of testing in mm-new is successful, the patch will me moved
into mm.git's mm-unstable branch, which is included in linux-next

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------------------------------------------------------
From: Tianyi Chen <hi@tychen.cc>
Subject: selftests/mm: reject invalid test selections before running tests
Date: Thu, 10 Sep 2026 20:56:44 +0800

Patch series "selftests/mm: Validate selections and scope memfd_secret
setup", v3.

run_vmtests.sh can reach test setup after invalid options or category
selections.  Its memfd_secret preparation can also change ptrace_scope
when that category was not selected.

Patch 1 rejects invalid selections before setup.  Patch 2 gates
memfd_secret preparation on category selection and executable presence.


This patch (of 2):

getopts reports unknown options and missing arguments, but run_vmtests.sh
ignores its error result and continues with test setup.  An empty -t
argument also falls back to the default selection, while unknown category
names can silently select no tests and still reach setup code.

Exit on getopts errors and validate category names against the existing
list in usage() before any test setup.  Reject empty and whitespace-only
selections, and normalize category separators so validation and execution
agree.  Initialize the default selection before parsing options so only -t
changes the selection.

Link: https://lore.kernel.org/20260910125645.285866-1-diannaaav@gmail.com
Link: https://lore.kernel.org/20260910125645.285866-2-diannaaav@gmail.com
Fixes: 85463321e726 ("selftests/vm: enable running select groups of tests")
Assisted-by: LLM
Signed-off-by: Tianyi Chen <hi@tychen.cc>
Cc: David Hildenbrand (Arm) <david@kernel.org>
Cc: Joel Savitz <jsavitz@redhat.com>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 tools/testing/selftests/mm/run_vmtests.sh |   26 ++++++++++++++++----
 1 file changed, 22 insertions(+), 4 deletions(-)

--- a/tools/testing/selftests/mm/run_vmtests.sh~selftests-mm-reject-invalid-test-selections-before-running-tests
+++ a/tools/testing/selftests/mm/run_vmtests.sh
@@ -96,26 +96,44 @@ separated by spaces:
 
 example: ./run_vmtests.sh -t "hmm mmap ksm"
 EOF
-	exit 0
 }
 
 RUN_ALL=false
 RUN_DESTRUCTIVE=false
 TAP_PREFIX="# "
 
+VM_SELFTEST_ITEMS="default"
+
 while getopts "aht:nd" OPT; do
 	case ${OPT} in
 		"a") RUN_ALL=true ;;
-		"h") usage ;;
+		"h") usage; exit 0 ;;
 		"t") VM_SELFTEST_ITEMS=${OPTARG} ;;
 		"n") TAP_PREFIX= ;;
 		"d") RUN_DESTRUCTIVE=true ;;
+		"?") exit 1 ;;
 	esac
 done
 shift $((OPTIND -1))
 
-# default behavior: run all tests
-VM_SELFTEST_ITEMS=${VM_SELFTEST_ITEMS:-default}
+# Normalize whitespace so validation and test_selected() use the same names.
+read -r -a selected_categories <<< "${VM_SELFTEST_ITEMS//$'\n'/ }"
+VM_SELFTEST_ITEMS="${selected_categories[*]}"
+if [ -z "$VM_SELFTEST_ITEMS" ]; then
+	echo "No test categories specified" >&2
+	exit 1
+fi
+
+if [ "$VM_SELFTEST_ITEMS" != "default" ]; then
+	# Keep the documented category list as the source of valid names.
+	valid_categories=$(usage | sed -n 's/^- //p')
+	for category in "${selected_categories[@]}"; do
+		if ! grep -Fxq -- "$category" <<< "$valid_categories"; then
+			echo "Unknown test category: $category" >&2
+			exit 1
+		fi
+	done
+fi
 
 test_selected() {
 	if [ "$VM_SELFTEST_ITEMS" == "default" ]; then
_

Patches currently in -mm which might be from hi@tychen.cc are

selftests-mm-reject-invalid-test-selections-before-running-tests.patch
selftests-mm-only-prepare-ptrace_scope-when-memfd_secret-is-selected.patch