selftests: capabilities: convert error output to TAP13 ksft framework

Convert errx() and err() usage to appropriate TAP13 ksft API.
Signed-off-by: NShuah Khan <shuahkh@osg.samsung.com>

tools/testing/selftests/capabilities/test_execve.c

 #define _GNU_SOURCE
 
 #include <cap-ng.h>
-#include <err.h>
 #include <linux/capability.h>
 #include <stdbool.h>
 #include <string.h>
@@ -39,29 +38,32 @@ static void vmaybe_write_file(bool enoent_ok, char *filename, char *fmt, va_list
 	int buf_len;
 
 	buf_len = vsnprintf(buf, sizeof(buf), fmt, ap);
-	if (buf_len < 0) {
-		err(1, "vsnprintf failed");
-	}
-	if (buf_len >= sizeof(buf)) {
-		errx(1, "vsnprintf output truncated");
-	}
+	if (buf_len < 0)
+		ksft_exit_fail_msg("vsnprintf failed - %s\n", strerror(errno));
+
+	if (buf_len >= sizeof(buf))
+		ksft_exit_fail_msg("vsnprintf output truncated\n");
+
 
 	fd = open(filename, O_WRONLY);
 	if (fd < 0) {
 		if ((errno == ENOENT) && enoent_ok)
 			return;
-		err(1, "open of %s failed", filename);
+		ksft_exit_fail_msg("open of %s failed - %s\n",
+					filename, strerror(errno));
 	}
 	written = write(fd, buf, buf_len);
 	if (written != buf_len) {
 		if (written >= 0) {
-			errx(1, "short write to %s", filename);
+			ksft_exit_fail_msg("short write to %s\n", filename);
 		} else {
-			err(1, "write to %s failed", filename);
+			ksft_exit_fail_msg("write to %s failed - %s\n",
+						filename, strerror(errno));
 		}
 	}
 	if (close(fd) != 0) {
-		err(1, "close of %s failed", filename);
+		ksft_exit_fail_msg("close of %s failed - %s\n",
+					filename, strerror(errno));
 	}
 }
 
@@ -100,9 +102,10 @@ static bool create_and_enter_ns(uid_t inner_uid)
 	if (unshare(CLONE_NEWNS) == 0) {
 		ksft_print_msg("[NOTE]\tUsing global UIDs for tests\n");
 		if (prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0) != 0)
-			err(1, "PR_SET_KEEPCAPS");
+			ksft_exit_fail_msg("PR_SET_KEEPCAPS - %s\n",
+						strerror(errno));
 		if (setresuid(inner_uid, inner_uid, -1) != 0)
-			err(1, "setresuid");
+			ksft_exit_fail_msg("setresuid - %s\n", strerror(errno));
 
 		// Re-enable effective caps
 		capng_get_caps_process();
@@ -110,7 +113,8 @@ static bool create_and_enter_ns(uid_t inner_uid)
 			if (capng_have_capability(CAPNG_PERMITTED, i))
 				capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, i);
 		if (capng_apply(CAPNG_SELECT_CAPS) != 0)
-			err(1, "capng_apply");
+			ksft_exit_fail_msg(
+					"capng_apply - %s\n", strerror(errno));
 
 		have_outer_privilege = true;
 	} else if (unshare(CLONE_NEWUSER | CLONE_NEWNS) == 0) {
@@ -121,11 +125,12 @@ static bool create_and_enter_ns(uid_t inner_uid)
 
 		have_outer_privilege = false;
 	} else {
-		errx(1, "must be root or be able to create a userns");
+		ksft_exit_skip("must be root or be able to create a userns\n");
 	}
 
 	if (mount("none", "/", NULL, MS_REC | MS_PRIVATE, NULL) != 0)
-		err(1, "remount everything private");
+		ksft_exit_fail_msg("remount everything private - %s\n",
+					strerror(errno));
 
 	return have_outer_privilege;
 }
@@ -134,20 +139,22 @@ static void chdir_to_tmpfs(void)
 {
 	char cwd[PATH_MAX];
 	if (getcwd(cwd, sizeof(cwd)) != cwd)
-		err(1, "getcwd");
+		ksft_exit_fail_msg("getcwd - %s\n", strerror(errno));
 
 	if (mount("private_tmp", ".", "tmpfs", 0, "mode=0777") != 0)
-		err(1, "mount private tmpfs");
+		ksft_exit_fail_msg("mount private tmpfs - %s\n",
+					strerror(errno));
 
 	if (chdir(cwd) != 0)
-		err(1, "chdir to private tmpfs");
+		ksft_exit_fail_msg("chdir to private tmpfs - %s\n",
+					strerror(errno));
 }
 
 static void copy_fromat_to(int fromfd, const char *fromname, const char *toname)
 {
 	int from = openat(fromfd, fromname, O_RDONLY);
 	if (from == -1)
-		err(1, "open copy source");
+		ksft_exit_fail_msg("open copy source - %s\n", strerror(errno));
 
 	int to = open(toname, O_CREAT | O_WRONLY | O_EXCL, 0700);
 
@@ -157,10 +164,11 @@ static void copy_fromat_to(int fromfd, const char *fromname, const char *toname)
 		if (sz == 0)
 			break;
 		if (sz < 0)
-			err(1, "read");
+			ksft_exit_fail_msg("read - %s\n", strerror(errno));
 
 		if (write(to, buf, sz) != sz)
-			err(1, "write");	/* no short writes on tmpfs */
+			/* no short writes on tmpfs */
+			ksft_exit_fail_msg("write - %s\n", strerror(errno));
 	}
 
 	close(from);
@@ -189,7 +197,8 @@ static bool fork_wait(void)
 		}
 		return false;
 	} else {
-		err(1, "fork");
+		ksft_exit_fail_msg("fork - %s\n", strerror(errno));
+		return false;
 	}
 }
 
@@ -199,7 +208,7 @@ static void exec_other_validate_cap(const char *name,
 	execl(name, name, (eff ? "1" : "0"),
 	      (perm ? "1" : "0"), (inh ? "1" : "0"), (ambient ? "1" : "0"),
 	      NULL);
-	err(1, "execl");
+	ksft_exit_fail_msg("execl - %s\n", strerror(errno));
 }
 
 static void exec_validate_cap(bool eff, bool perm, bool inh, bool ambient)
@@ -213,7 +222,8 @@ static int do_tests(int uid, const char *our_path)
 
 	int ourpath_fd = open(our_path, O_RDONLY | O_DIRECTORY);
 	if (ourpath_fd == -1)
-		err(1, "open '%s'", our_path);
+		ksft_exit_fail_msg("open '%s' - %s\n",
+					our_path, strerror(errno));
 
 	chdir_to_tmpfs();
 
@@ -225,30 +235,30 @@ static int do_tests(int uid, const char *our_path)
 		copy_fromat_to(ourpath_fd, "validate_cap",
 			       "validate_cap_suidroot");
 		if (chown("validate_cap_suidroot", 0, -1) != 0)
-			err(1, "chown");
+			ksft_exit_fail_msg("chown - %s\n", strerror(errno));
 		if (chmod("validate_cap_suidroot", S_ISUID | 0700) != 0)
-			err(1, "chmod");
+			ksft_exit_fail_msg("chmod - %s\n", strerror(errno));
 
 		copy_fromat_to(ourpath_fd, "validate_cap",
 			       "validate_cap_suidnonroot");
 		if (chown("validate_cap_suidnonroot", uid + 1, -1) != 0)
-			err(1, "chown");
+			ksft_exit_fail_msg("chown - %s\n", strerror(errno));
 		if (chmod("validate_cap_suidnonroot", S_ISUID | 0700) != 0)
-			err(1, "chmod");
+			ksft_exit_fail_msg("chmod - %s\n", strerror(errno));
 
 		copy_fromat_to(ourpath_fd, "validate_cap",
 			       "validate_cap_sgidroot");
 		if (chown("validate_cap_sgidroot", -1, 0) != 0)
-			err(1, "chown");
+			ksft_exit_fail_msg("chown - %s\n", strerror(errno));
 		if (chmod("validate_cap_sgidroot", S_ISGID | 0710) != 0)
-			err(1, "chmod");
+			ksft_exit_fail_msg("chmod - %s\n", strerror(errno));
 
 		copy_fromat_to(ourpath_fd, "validate_cap",
 			       "validate_cap_sgidnonroot");
 		if (chown("validate_cap_sgidnonroot", -1, gid + 1) != 0)
-			err(1, "chown");
+			ksft_exit_fail_msg("chown - %s\n", strerror(errno));
 		if (chmod("validate_cap_sgidnonroot", S_ISGID | 0710) != 0)
-			err(1, "chmod");
+			ksft_exit_fail_msg("chmod - %s\n", strerror(errno));
 	}
 
 	capng_get_caps_process();
@@ -256,7 +266,7 @@ static int do_tests(int uid, const char *our_path)
 	/* Make sure that i starts out clear */
 	capng_update(CAPNG_DROP, CAPNG_INHERITABLE, CAP_NET_BIND_SERVICE);
 	if (capng_apply(CAPNG_SELECT_CAPS) != 0)
-		err(1, "capng_apply");
+		ksft_exit_fail_msg("capng_apply - %s\n", strerror(errno));
 
 	if (uid == 0) {
 		ksft_print_msg("[RUN]\tRoot => ep\n");
@@ -287,7 +297,7 @@ static int do_tests(int uid, const char *our_path)
 	capng_update(CAPNG_DROP, CAPNG_PERMITTED, CAP_NET_RAW);
 	capng_update(CAPNG_DROP, CAPNG_EFFECTIVE, CAP_NET_RAW);
 	if (capng_apply(CAPNG_SELECT_CAPS) != 0)
-		err(1, "capng_apply");
+		ksft_exit_fail_msg("capng_apply - %s\n", strerror(errno));
 	if (prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_RAISE, CAP_NET_RAW, 0, 0, 0) != -1 || errno != EPERM) {
 		ksft_test_result_fail(
 			"PR_CAP_AMBIENT_RAISE should have failed on a non-permitted cap\n");
@@ -298,7 +308,7 @@ static int do_tests(int uid, const char *our_path)
 
 	capng_update(CAPNG_ADD, CAPNG_INHERITABLE, CAP_NET_BIND_SERVICE);
 	if (capng_apply(CAPNG_SELECT_CAPS) != 0)
-		err(1, "capng_apply");
+		ksft_exit_fail_msg("capng_apply - %s\n", strerror(errno));
 	if (prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_RAISE, CAP_NET_BIND_SERVICE, 0, 0, 0) != 0) {
 		ksft_test_result_fail(
 			"PR_CAP_AMBIENT_RAISE should have succeeded\n");
@@ -312,7 +322,8 @@ static int do_tests(int uid, const char *our_path)
 	}
 
 	if (prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_CLEAR_ALL, 0, 0, 0, 0) != 0)
-		err(1, "PR_CAP_AMBIENT_CLEAR_ALL");
+		ksft_exit_fail_msg("PR_CAP_AMBIENT_CLEAR_ALL - %s\n",
+					strerror(errno));
 
 	if (prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_IS_SET, CAP_NET_BIND_SERVICE, 0, 0, 0) != 0) {
 		ksft_test_result_fail(
@@ -321,11 +332,12 @@ static int do_tests(int uid, const char *our_path)
 	}
 
 	if (prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_RAISE, CAP_NET_BIND_SERVICE, 0, 0, 0) != 0)
-		err(1, "PR_CAP_AMBIENT_RAISE");
+		ksft_exit_fail_msg("PR_CAP_AMBIENT_RAISE - %s\n",
+					strerror(errno));
 
 	capng_update(CAPNG_DROP, CAPNG_INHERITABLE, CAP_NET_BIND_SERVICE);
 	if (capng_apply(CAPNG_SELECT_CAPS) != 0)
-		err(1, "capng_apply");
+		ksft_exit_fail_msg("capng_apply - %s\n", strerror(errno));
 
 	if (prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_IS_SET, CAP_NET_BIND_SERVICE, 0, 0, 0) != 0) {
 		ksft_test_result_fail("Dropping I should have dropped A\n");
@@ -336,7 +348,7 @@ static int do_tests(int uid, const char *our_path)
 
 	capng_update(CAPNG_ADD, CAPNG_INHERITABLE, CAP_NET_BIND_SERVICE);
 	if (capng_apply(CAPNG_SELECT_CAPS) != 0)
-		err(1, "capng_apply");
+		ksft_exit_fail_msg("capng_apply - %s\n", strerror(errno));
 	if (uid == 0) {
 		ksft_print_msg("[RUN]\tRoot +i => eip\n");
 		if (fork_wait())
@@ -348,7 +360,8 @@ static int do_tests(int uid, const char *our_path)
 	}
 
 	if (prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_RAISE, CAP_NET_BIND_SERVICE, 0, 0, 0) != 0)
-		err(1, "PR_CAP_AMBIENT_RAISE");
+		ksft_exit_fail_msg("PR_CAP_AMBIENT_RAISE - %s\n",
+					strerror(errno));
 
 	ksft_print_msg("[RUN]\tUID %d +ia => eipa\n", uid);
 	if (fork_wait())
@@ -381,7 +394,8 @@ static int do_tests(int uid, const char *our_path)
 			ksft_print_msg(
 				"[RUN]\tRoot, gid != 0, +ia, sgidroot => eip\n");
 			if (setresgid(1, 1, 1) != 0)
-				err(1, "setresgid");
+				ksft_exit_fail_msg("setresgid - %s\n",
+							strerror(errno));
 			exec_other_validate_cap("./validate_cap_sgidroot",
 						true, true, true, false);
 		}
@@ -399,7 +413,8 @@ static int do_tests(int uid, const char *our_path)
 		if (fork_wait()) {
 			ksft_print_msg("[RUN]\tNon-root +ia, sgidroot => i\n");
 			if (setresgid(1, 1, 1) != 0)
-				err(1, "setresgid");
+				ksft_exit_fail_msg("setresgid - %s\n",
+							strerror(errno));
 			exec_other_validate_cap("./validate_cap_sgidroot",
 						false, false, true, false);
 		}
@@ -419,11 +434,11 @@ int main(int argc, char **argv)
 	/* Find our path */
 	tmp1 = strdup(argv[0]);
 	if (!tmp1)
-		err(1, "strdup");
+		ksft_exit_fail_msg("strdup - %s\n", strerror(errno));
 	tmp2 = dirname(tmp1);
 	our_path = strdup(tmp2);
 	if (!our_path)
-		err(1, "strdup");
+		ksft_exit_fail_msg("strdup - %s\n", strerror(errno));
 	free(tmp1);
 
 	mpid = getpid();

tools/testing/selftests/capabilities/validate_cap.c

 #include <cap-ng.h>
-#include <err.h>
 #include <linux/capability.h>
 #include <stdbool.h>
 #include <string.h>
@@ -27,8 +26,10 @@ static bool bool_arg(char **argv, int i)
 		return false;
 	else if (!strcmp(argv[i], "1"))
 		return true;
-	else
-		errx(1, "wrong argv[%d]", i);
+	else {
+		ksft_exit_fail_msg("wrong argv[%d]\n", i);
+		return false;
+	}
 }
 
 int main(int argc, char **argv)
@@ -41,7 +42,7 @@ int main(int argc, char **argv)
 	 */
 
 	if (argc != 5)
-		errx(1, "wrong argc");
+		ksft_exit_fail_msg("wrong argc\n");
 
 #ifdef HAVE_GETAUXVAL
 	if (getauxval(AT_SECURE))