linux-kernel - [PATCH v2 1/2] selftests/mm: on-fault-limit: run test without root privileges otherwise skip

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Date: Thu,  1 Feb 2024 18:05:36 +0500
From: Muhammad Usama Anjum <usama.anjum@...labora.com>
To: Andrew Morton <akpm@...ux-foundation.org>,
	Shuah Khan <shuah@...nel.org>,
	Muhammad Usama Anjum <usama.anjum@...labora.com>
Cc: kernel@...labora.com,
	ryan.roberts@....com,
	linux-mm@...ck.org,
	linux-kselftest@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/2] selftests/mm: on-fault-limit: run test without root privileges otherwise skip

The mmap() respects rlimit only for normal users. This test should be
run as normal user, without root privileges. Also add back the sudo -u
nobody as run_vmtests.sh is run as root most of the times. Skip the test
instead if sudo isn't present to lower the privileges.

Fixes: b6221771d468 ("selftests/mm: run_vmtests: remove sudo and conform to tap")
Signed-off-by: Muhammad Usama Anjum <usama.anjum@...labora.com>
---
Please fold this patch in the Fixes patch if needed.
---
 tools/testing/selftests/mm/on-fault-limit.c | 6 +++---
 tools/testing/selftests/mm/run_vmtests.sh   | 7 ++++++-
 2 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/tools/testing/selftests/mm/on-fault-limit.c b/tools/testing/selftests/mm/on-fault-limit.c
index 0ea98ffab3589..431c1277d83a1 100644
--- a/tools/testing/selftests/mm/on-fault-limit.c
+++ b/tools/testing/selftests/mm/on-fault-limit.c
@@ -21,7 +21,7 @@ static void test_limit(void)
 	map = mmap(NULL, 2 * lims.rlim_max, PROT_READ | PROT_WRITE,
 		   MAP_PRIVATE | MAP_ANONYMOUS | MAP_POPULATE, -1, 0);
 
-	ksft_test_result(map == MAP_FAILED, "Failed mmap\n");
+	ksft_test_result(map == MAP_FAILED, "The map failed respecting mlock limits\n");
 
 	if (map != MAP_FAILED)
 		munmap(map, 2 * lims.rlim_max);
@@ -33,8 +33,8 @@ int main(int argc, char **argv)
 	ksft_print_header();
 	ksft_set_plan(1);
 
-	if (getuid())
-		ksft_test_result_skip("Require root privileges to run\n");
+	if (!getuid())
+		ksft_test_result_skip("The test must be run from a normal user\n");
 	else
 		test_limit();
 
diff --git a/tools/testing/selftests/mm/run_vmtests.sh b/tools/testing/selftests/mm/run_vmtests.sh
index 55898d64e2ebf..edd73f871c79a 100755
--- a/tools/testing/selftests/mm/run_vmtests.sh
+++ b/tools/testing/selftests/mm/run_vmtests.sh
@@ -303,7 +303,12 @@ echo "$nr_hugepgs" > /proc/sys/vm/nr_hugepages
 
 CATEGORY="compaction" run_test ./compaction_test
 
-CATEGORY="mlock" run_test ./on-fault-limit
+if command -v sudo &> /dev/null;
+then
+	CATEGORY="mlock" run_test sudo -u nobody ./on-fault-limit
+else
+	echo "# SKIP ./on-fault-limit"
+fi
 
 CATEGORY="mmap" run_test ./map_populate
 
-- 
2.42.0