On Tue, Jun 10, 2025 at 03:07:44PM +0100, Mark Brown wrote:

When running the memfd_secret test run_vmtests.sh unconditionally tries to confgiure the YAMA LSM's ptrace_scope configuration, leading to an error if YAMA is not in the running kernel:

# ./run_vmtests.sh: line 432: /proc/sys/kernel/yama/ptrace_scope: No such file or directory # # ---------------------- # # running ./memfd_secret # # ----------------------

Check that this file is present before trying to write to it.

The indentation here is a bit odd, and it doesn't seem great that we configure but don't restore ptrace_scope.

Signed-off-by: Mark Brown broonie@kernel.org

Acked-by: Mike Rapoport (Microsoft) rppt@kernel.org

---

tools/testing/selftests/mm/run_vmtests.sh | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/mm/run_vmtests.sh b/tools/testing/selftests/mm/run_vmtests.sh index dddd1dd8af14..33fc7fafa8f9 100755 --- a/tools/testing/selftests/mm/run_vmtests.sh +++ b/tools/testing/selftests/mm/run_vmtests.sh @@ -429,7 +429,9 @@ CATEGORY="vma_merge" run_test ./merge if [ -x ./memfd_secret ] then -(echo 0 > /proc/sys/kernel/yama/ptrace_scope 2>&1) | tap_prefix +if [ -f /proc/sys/kernel/yama/ptrace_scope ]; then

• (echo 0 > /proc/sys/kernel/yama/ptrace_scope 2>&1) | tap_prefix

+fi CATEGORY="memfd_secret" run_test ./memfd_secret fi

---

base-commit: 19272b37aa4f83ca52bdf9c16d5d81bdd1354494 change-id: 20250605-selftest-mm-enable-yama-1541c2d2ddcd

Best regards,

Mark Brown broonie@kernel.org