selinux: always try to load the full selinux db

https://github.com/systemd/systemd/pull/2508#issuecomment-190901170
Maybe fixes https://bugzilla.redhat.com/show_bug.cgi?id=1308771.

src/basic/selinux-util.c

@@ -80,31 +80,23 @@ void mac_selinux_retest(void) {
 #endif
 }
 
-int mac_selinux_init(const char *prefix) {
+int mac_selinux_init(void) {
         int r = 0;
 
 #ifdef HAVE_SELINUX
         usec_t before_timestamp, after_timestamp;
         struct mallinfo before_mallinfo, after_mallinfo;
 
-        if (!mac_selinux_use())
+        if (label_hnd)
                 return 0;
 
-        if (label_hnd)
+        if (!mac_selinux_use())
                 return 0;
 
         before_mallinfo = mallinfo();
         before_timestamp = now(CLOCK_MONOTONIC);
 
-        if (prefix) {
-                struct selinux_opt options[] = {
-                        { .type = SELABEL_OPT_SUBSET, .value = prefix },
-                };
-
-                label_hnd = selabel_open(SELABEL_CTX_FILE, options, ELEMENTSOF(options));
-        } else
-                label_hnd = selabel_open(SELABEL_CTX_FILE, NULL, 0);
-
+        label_hnd = selabel_open(SELABEL_CTX_FILE, NULL, 0);
         if (!label_hnd) {
                 log_enforcing("Failed to initialize SELinux context: %m");
                 r = security_getenforce() == 1 ? -errno : 0;

src/basic/selinux-util.h

@@ -29,7 +29,7 @@ bool mac_selinux_use(void);
 bool mac_selinux_have(void);
 void mac_selinux_retest(void);
 
-int mac_selinux_init(const char *prefix);
+int mac_selinux_init(void);
 void mac_selinux_finish(void);
 
 int mac_selinux_fix(const char *path, bool ignore_enoent, bool ignore_erofs);

src/core/main.c

@@ -1369,7 +1369,7 @@ int main(int argc, char *argv[]) {
                         dual_timestamp_get(&security_finish_timestamp);
                 }
 
-                if (mac_selinux_init(NULL) < 0) {
+                if (mac_selinux_init() < 0) {
                         error_message = "Failed to initialize SELinux policy";
                         goto finish;
                 }

src/hostname/hostnamed.c

@@ -706,7 +706,7 @@ int main(int argc, char *argv[]) {
         log_open();
 
         umask(0022);
-        mac_selinux_init("/etc");
+        mac_selinux_init();
 
         if (argc != 1) {
                 log_error("This program takes no arguments.");

src/locale/localed.c

@@ -1296,7 +1296,7 @@ int main(int argc, char *argv[]) {
         log_open();
 
         umask(0022);
-        mac_selinux_init("/etc");
+        mac_selinux_init();
 
         if (argc != 1) {
                 log_error("This program takes no arguments.");

src/login/logind.c

@@ -1126,7 +1126,7 @@ int main(int argc, char *argv[]) {
                 goto finish;
         }
 
-        r = mac_selinux_init("/run");
+        r = mac_selinux_init();
         if (r < 0) {
                 log_error_errno(r, "Could not initialize labelling: %m");
                 goto finish;

src/resolve/resolved.c

@@ -48,7 +48,7 @@ int main(int argc, char *argv[]) {
 
         umask(0022);
 
-        r = mac_selinux_init(NULL);
+        r = mac_selinux_init();
         if (r < 0) {
                 log_error_errno(r, "SELinux setup failed: %m");
                 goto finish;

src/sysusers/sysusers.c

@@ -1820,7 +1820,7 @@ int main(int argc, char *argv[]) {
 
         umask(0022);
 
-        r = mac_selinux_init(NULL);
+        r = mac_selinux_init();
         if (r < 0) {
                 log_error_errno(r, "SELinux setup failed: %m");
                 goto finish;

src/test/test-udev.c

@@ -93,7 +93,7 @@ int main(int argc, char *argv[]) {
                 return EXIT_FAILURE;
 
         log_debug("version %s", VERSION);
-        mac_selinux_init("/dev");
+        mac_selinux_init();
 
         action = argv[1];
         if (action == NULL) {

src/timedate/timedated.c

@@ -173,7 +173,7 @@ static int context_write_data_local_rtc(Context *c) {
                 }
         }
 
-        mac_selinux_init("/etc");
+        mac_selinux_init();
         return write_string_file_atomic_label("/etc/adjtime", w);
 }
 

src/tmpfiles/tmpfiles.c

@@ -2288,7 +2288,7 @@ int main(int argc, char *argv[]) {
 
         umask(0022);
 
-        mac_selinux_init(NULL);
+        mac_selinux_init();
 
         items = ordered_hashmap_new(&string_hash_ops);
         globs = ordered_hashmap_new(&string_hash_ops);

src/udev/udevadm.c

@@ -93,7 +93,7 @@ int main(int argc, char *argv[]) {
 
         log_parse_environment();
         log_open();
-        mac_selinux_init("/dev");
+        mac_selinux_init();
 
         while ((c = getopt_long(argc, argv, "+dhV", options, NULL)) >= 0)
                 switch (c) {

src/udev/udevd.c

@@ -1695,7 +1695,7 @@ int main(int argc, char *argv[]) {
 
         umask(022);
 
-        r = mac_selinux_init("/dev");
+        r = mac_selinux_init();
         if (r < 0) {
                 log_error_errno(r, "could not initialize labelling: %m");
                 goto exit;

src/update-done/update-done.c

@@ -101,7 +101,7 @@ int main(int argc, char *argv[]) {
                 return EXIT_FAILURE;
         }
 
-        r = mac_selinux_init(NULL);
+        r = mac_selinux_init();
         if (r < 0) {
                 log_error_errno(r, "SELinux setup failed: %m");
                 goto finish;

src/user-sessions/user-sessions.c

@@ -40,7 +40,7 @@ int main(int argc, char*argv[]) {
 
         umask(0022);
 
-        mac_selinux_init(NULL);
+        mac_selinux_init();
 
         if (streq(argv[1], "start")) {
                 int r = 0;