core: add Personality= option for units to set the personality for spawned processes

src/shared/exit-status.c

@@ -133,6 +133,9 @@ const char* exit_status_to_string(ExitStatus status, ExitStatusLevel level) {
 
                 case EXIT_SELINUX_CONTEXT:
                         return "SELINUX_CONTEXT";
+
+                case EXIT_PERSONALITY:
+                        return "PERSONALITY";
                 }
         }
 

src/shared/exit-status.h

@@ -68,7 +68,8 @@ typedef enum ExitStatus {
         EXIT_NAMESPACE,
         EXIT_NO_NEW_PRIVILEGES,
         EXIT_SECCOMP,
-        EXIT_SELINUX_CONTEXT
+        EXIT_SELINUX_CONTEXT,
+        EXIT_PERSONALITY  /* 230 */
 } ExitStatus;
 
 typedef enum ExitStatusLevel {

src/shared/util.c

@@ -6194,7 +6194,7 @@ int fd_warn_permissions(const char *path, int fd) {
         return 0;
 }
 
-unsigned long parse_personality(const char *p) {
+unsigned long personality_from_string(const char *p) {
 
         /* Parse a personality specifier. We introduce our own
          * identifiers that indicate specific ABIs, rather than just
@@ -6222,3 +6222,22 @@ unsigned long parse_personality(const char *p) {
          * as error indicator. */
         return 0xffffffffUL;
 }
+
+const char* personality_to_string(unsigned long p) {
+
+#if defined(__x86_64__)
+
+        if (p == PER_LINUX32)
+                return "x86";
+
+        if (p == PER_LINUX)
+                return "x86-64";
+
+#elif defined(__i386__)
+
+        if (p == PER_LINUX)
+                return "x86";
+#endif
+
+        return NULL;
+}

src/shared/util.h

@@ -871,4 +871,5 @@ int open_tmpfile(const char *path, int flags);
 
 int fd_warn_permissions(const char *path, int fd);
 
-unsigned long parse_personality(const char *p);
+unsigned long personality_from_string(const char *p);
+const char *personality_to_string(unsigned long);