Imported Upstream version 1.25

[debian/tar] / src / extract.c

diff --git a/src/extract.c b/src/extract.c
index 0d23d4ab55ec9027b45bfd5ae3dff676ef223e3f..6711f8736951a3a541d85dec9c845a9bc5e38f97 100644 (file)
--- a/src/extract.c
+++ b/src/extract.c
@@ -777,7 +777,7 @@ extract_dir (char *file_name, int typeflag)
 
   for (;;)
     {
-      status = mkdir (file_name, mode);
+      status = mkdirat (chdir_fd, file_name, mode);
       if (status == 0)
        {
          current_mode = mode & ~ current_umask;
@@ -864,6 +864,20 @@ open_output_file (char const *file_name, int typeflag, mode_t mode,
        }
     }
 
+  /* If O_NOFOLLOW is needed but does not work, check for a symlink
+     separately.  There's a race condition, but that cannot be avoided
+     on hosts lacking O_NOFOLLOW.  */
+  if (! O_NOFOLLOW && overwriting_old_files && ! dereference_option)
+    {
+      struct stat st;
+      if (fstatat (chdir_fd, file_name, &st, AT_SYMLINK_NOFOLLOW) == 0
+         && S_ISLNK (st.st_mode))
+       {
+         errno = ELOOP;
+         return -1;
+       }
+    }
+
   fd = openat (chdir_fd, file_name, openflag, mode);
   if (0 <= fd)
     {
@@ -1191,7 +1205,7 @@ static int
 extract_node (char *file_name, int typeflag)
 {
   bool interdir_made = false;
-  mode_t mode = (current_stat_info.stat.st_mode & MODE_RWX
+  mode_t mode = (current_stat_info.stat.st_mode & (MODE_RWX | S_IFBLK | S_IFCHR)
                 & ~ (0 < same_owner_option ? S_IRWXG | S_IRWXO : 0));
 
   while (mknodat (chdir_fd, file_name, mode, current_stat_info.stat.st_rdev)