From: Mark Brown Date: Tue, 10 Jun 2025 14:07:44 +0000 (+0100) Subject: selftests/mm: check for YAMA ptrace_scope configuraiton before modifying it X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ba78585585d9f5ec4dd32de7b3027a86fe33cee0;p=thirdparty%2Fkernel%2Flinux.git selftests/mm: check for YAMA ptrace_scope configuraiton before modifying it 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. Link: https://lkml.kernel.org/r/20250610-selftest-mm-enable-yama-v1-1-0097b6713116@kernel.org Signed-off-by: Mark Brown Acked-by: Mike Rapoport (Microsoft) Acked-by: David Hildenbrand Cc: Shuah Khan Signed-off-by: Andrew Morton --- diff --git a/tools/testing/selftests/mm/run_vmtests.sh b/tools/testing/selftests/mm/run_vmtests.sh index dddd1dd8af145..33fc7fafa8f9a 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