Revert "Enable restorecon to properly label symlinks."

This change resulted in //data being used for restorecon, rather than
/data, causing the check to fail when deciding whether or not init
should label app data files.

This reverts commit 249094fc.

Bug: 24190361
Change-Id: I803b9a644e02983c30f47b00806b52a4493801ed

src/android.c

@@ -31,7 +31,6 @@
 #include <limits.h>
 #include <sys/vfs.h>
 #include <linux/magic.h>
-#include <libgen.h>
 
 /*
  * XXX Where should this configuration file be located?
@@ -1232,7 +1231,7 @@ static int selinux_android_restorecon_common(const char* pathname_orig,
     struct statfs sfsb;
     FTS *fts;
     FTSENT *ftsent;
-    char *pathname = NULL, *pathdnamer = NULL, *pathdname, *pathbname;
+    char *pathname;
     char * paths[2] = { NULL , NULL };
     int ftsflags = FTS_NOCHDIR | FTS_XDEV | FTS_PHYSICAL;
     int error, sverrno;
@@ -1247,25 +1246,16 @@ static int selinux_android_restorecon_common(const char* pathname_orig,
     if (!fc_sehandle)
         return 0;
 
-    /*
-     * Convert passed-in pathname to canonical pathname by resolving realpath of
-     * containing dir, then appending last component name.
-     */
-    pathbname = basename(pathname_orig);
-    if (!strcmp(pathbname, "/") || !strcmp(pathbname, ".") || !strcmp(pathbname, "..")) {
-        pathname = realpath(pathname_orig, NULL);
-        if (!pathname)
-            goto realpatherr;
-    } else {
-        pathdname = dirname(pathname_orig);
-        pathdnamer = realpath(pathdname, NULL);
-        if (!pathdnamer)
-            goto realpatherr;
-        error = asprintf(&pathname, "%s/%s", pathdnamer, pathbname);
-        if (error < 0)
-            goto oom;
+    // convert passed-in pathname to canonical pathname
+    pathname = realpath(pathname_orig, NULL);
+    if (!pathname) {
+        sverrno = errno;
+        selinux_log(SELINUX_ERROR, "SELinux: Could not get canonical path %s restorecon: %s.\n",
+                pathname_orig, strerror(errno));
+        errno = sverrno;
+        error = -1;
+        goto cleanup;
     }
-
     paths[0] = pathname;
     issys = (!strcmp(pathname, SYS_PATH)
             || !strncmp(pathname, SYS_PREFIX, sizeof(SYS_PREFIX)-1)) ? true : false;
@@ -1374,22 +1364,8 @@ out:
     (void) fts_close(fts);
     errno = sverrno;
 cleanup:
-    free(pathdnamer);
     free(pathname);
     return error;
-oom:
-    sverrno = errno;
-    selinux_log(SELINUX_ERROR, "%s:  Out of memory\n", __FUNCTION__);
-    errno = sverrno;
-    error = -1;
-    goto cleanup;
-realpatherr:
-    sverrno = errno;
-    selinux_log(SELINUX_ERROR, "SELinux: Could not get canonical path for %s restorecon: %s.\n",
-            pathname_orig, strerror(errno));
-    errno = sverrno;
-    error = -1;
-    goto cleanup;
 }
 
 int selinux_android_restorecon(const char *file, unsigned int flags)