linux-kernel - [PATCH] selftests/mm: ksm_tests: skip when not run as root

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <20260109094313.52307-1-sun.jian.kdev@gmail.com>
Date: Fri,  9 Jan 2026 17:43:13 +0800
From: Sun Jian <sun.jian.kdev@...il.com>
To: Shuah Khan <shuah@...nel.org>
Cc: linux-kselftest@...r.kernel.org,
	linux-mm@...ck.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Sun Jian <sun.jian.kdev@...il.com>
Subject: [PATCH] selftests/mm: ksm_tests: skip when not run as root

ksm_tests writes KSM sysfs knobs under /sys/kernel/mm/ksm, which requires
root privileges. When run unprivileged, it fails with permission errors
and reports FAIL, which is misleading.

Skip the test early when not run as root to avoid false failures.

Signed-off-by: Sun Jian <sun.jian.kdev@...il.com>
---
 tools/testing/selftests/mm/ksm_tests.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tools/testing/selftests/mm/ksm_tests.c b/tools/testing/selftests/mm/ksm_tests.c
index a0b48b839d54..c22cd9c61711 100644
--- a/tools/testing/selftests/mm/ksm_tests.c
+++ b/tools/testing/selftests/mm/ksm_tests.c
@@ -766,6 +766,11 @@ int main(int argc, char *argv[])
 	bool merge_across_nodes = KSM_MERGE_ACROSS_NODES_DEFAULT;
 	long size_MB = 0;
 
+	if (geteuid() != 0) {
+		printf("# SKIP ksm_tests requires root privileges\n");
+		return KSFT_SKIP;
+	}
+
 	while ((opt = getopt(argc, argv, "dha:p:l:z:m:s:t:MUZNPCHD")) != -1) {
 		switch (opt) {
 		case 'a':
-- 
2.43.0