1 files changed, 73 insertions, 0 deletions
diff --git a/tools/testing/selftests/capabilities/validate_cap.c b/tools/testing/selftests/capabilities/validate_cap.c
new file mode 100644
index 000000000000..dd3c45f7b23c
--- /dev/null
+++ b/tools/testing/selftests/capabilities/validate_cap.c
@@ -0,0 +1,73 @@
+#include <cap-ng.h>
+#include <err.h>
+#include <linux/capability.h>
+#include <stdbool.h>
+#include <string.h>
+#include <stdio.h>
+#include <sys/prctl.h>
+#include <sys/auxv.h>
+
+#ifndef PR_CAP_AMBIENT
+#define PR_CAP_AMBIENT			47
+# define PR_CAP_AMBIENT_IS_SET		1
+# define PR_CAP_AMBIENT_RAISE		2
+# define PR_CAP_AMBIENT_LOWER		3
+# define PR_CAP_AMBIENT_CLEAR_ALL	4
+#endif
+
+#if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 19)
+# define HAVE_GETAUXVAL
+#endif
+
+static bool bool_arg(char **argv, int i)
+{
+	if (!strcmp(argv[i], "0"))
+		return false;
+	else if (!strcmp(argv[i], "1"))
+		return true;
+	else
+		errx(1, "wrong argv[%d]", i);
+}
+
+int main(int argc, char **argv)
+{
+	const char *atsec = "";
+
+	/*
+	 * Be careful just in case a setgid or setcapped copy of this
+	 * helper gets out.
+	 */
+
+	if (argc != 5)
+		errx(1, "wrong argc");
+
+#ifdef HAVE_GETAUXVAL
+	if (getauxval(AT_SECURE))
+		atsec = " (AT_SECURE is set)";
+	else
+		atsec = " (AT_SECURE is not set)";
+#endif
+
+	capng_get_caps_process();
+
+	if (capng_have_capability(CAPNG_EFFECTIVE, CAP_NET_BIND_SERVICE) != bool_arg(argv, 1)) {
+		printf("[FAIL]\tWrong effective state%s\n", atsec);
+		return 1;
+	}
+	if (capng_have_capability(CAPNG_PERMITTED, CAP_NET_BIND_SERVICE) != bool_arg(argv, 2)) {
+		printf("[FAIL]\tWrong permitted state%s\n", atsec);
+		return 1;
+	}
+	if (capng_have_capability(CAPNG_INHERITABLE, CAP_NET_BIND_SERVICE) != bool_arg(argv, 3)) {
+		printf("[FAIL]\tWrong inheritable state%s\n", atsec);
+		return 1;
+	}
+
+	if (prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_IS_SET, CAP_NET_BIND_SERVICE, 0, 0, 0) != bool_arg(argv, 4)) {
+		printf("[FAIL]\tWrong ambient state%s\n", atsec);
+		return 1;
+	}
+
+	printf("[OK]\tCapabilities after execve were correct\n");
+	return 0;
+}