X-Git-Url: http://gitweb.michael.orlitzky.com/?a=blobdiff_plain;f=src%2Flibadacl.c;h=d2462c816f49420aaa2a09aff1fe2c2144f466ef;hb=8ec2f2bde7c53834a304bcdc68e84d8c7a748ca4;hp=cdd07fcfee7c7400256e9ea619cc6abea99a195d;hpb=dcaa939a0e09bceb1392488fa126232629a63aa8;p=apply-default-acl.git

diff --git a/src/libadacl.c b/src/libadacl.c
index cdd07fc..d2462c8 100644
--- a/src/libadacl.c
+++ b/src/libadacl.c
@@ -1003,7 +1003,28 @@ int apply_default_acl(const char* path, bool recursive) {
     return ACL_ERROR;
   }
   char* parent = dirname(dirname_path_copy);
+
+  basename_path_copy = strdup(path);
+  if (basename_path_copy == NULL) {
+    perror("apply_default_acl (strdup)");
+    result = ACL_ERROR;
+    goto cleanup;
+  }
+  char* child = basename(basename_path_copy);
+
+  /* Just kidding, if the path is "." or "..", then dirname will do
+   * the wrong thing and give us "." as its parent, too. So, we handle
+   * those as special cases. We use "child" instead of "path" here to
+   * catch things like "./" and "../"
+   */
+  bool path_is_dots = strcmp(child, ".") == 0 || strcmp(child, "..") == 0;
+  char dots_parent[6] = "../";
+  if (path_is_dots) {
+    parent = strcat(dots_parent, child);
+  }
+
   parent_fd = safe_open(parent, O_DIRECTORY | O_NOFOLLOW);
+
   if (parent_fd == OPEN_ERROR) {
     if (errno == ELOOP || errno == ENOTDIR) {
       /* We hit a symlink, either in the last path component (ELOOP)
@@ -1019,15 +1040,20 @@ int apply_default_acl(const char* path, bool recursive) {
   }
 
   /* We already obtained the parent fd safely, so if we use the
-     basename of path here instead of the full thing, then we can get
-     away with using openat() and spare ourselves the slowness of
-     another safe_open(). */
-  basename_path_copy = strdup(path);
-  if (basename_path_copy == NULL) {
-    perror("apply_default_acl (strdup)");
-    return ACL_ERROR;
+   * basename of path here instead of the full thing, then we can get
+   * away with using openat() and spare ourselves the slowness of
+   * another safe_open().
+   *
+   * Note that if the basename is "." or "..", then we don't want to
+   * open it relative to the parent_fd, so we need another special
+   * case for those paths here.
+   */
+  if (path_is_dots) {
+    fd = open(child, O_NOFOLLOW);
+  }
+  else {
+    fd = openat(parent_fd, child, O_NOFOLLOW);
   }
-  fd = openat(parent_fd, basename(basename_path_copy), O_NOFOLLOW);
   if (fd == OPEN_ERROR) {
     if (errno == ELOOP || errno == ENOTDIR) {
       /* We hit a symlink, either in the last path component (ELOOP)