commit 95f7c57ff4090a5dee062044d2c7b99879077808
Author: Kamil Dudka <kdudka@redhat.com>
Date:   Fri Jul 22 14:48:42 2011 +0200

    file-has-acl: use acl_extended_file_nofollow if available
    
    * lib/acl-internal.h (HAVE_ACL_EXTENDED_FILE): New macro.
    (acl_extended_file): New macro.
    * lib/file-has-acl.c (file_has_acl): Use acl_extended_file_nofollow.
    * m4/acl.m4 (gl_FUNC_ACL): Check for acl_extended_file_nofollow.
    This addresses http://bugzilla.redhat.com/692823.

Index: lib/acl-internal.h
===================================================================
--- lib/acl-internal.h.orig	2012-03-09 08:31:00.000000000 +0100
+++ lib/acl-internal.h	2012-04-16 13:17:12.470016537 +0200
@@ -142,6 +142,12 @@ rpl_acl_set_fd (int fd, acl_t acl)
 #  endif
 
 /* Linux-specific */
+#  ifndef HAVE_ACL_EXTENDED_FILE_NOFOLLOW
+#   define HAVE_ACL_EXTENDED_FILE_NOFOLLOW false
+#   define acl_extended_file_nofollow(name) (-1)
+#  endif
+
+/* Linux-specific */
 #  ifndef HAVE_ACL_FROM_MODE
 #   define HAVE_ACL_FROM_MODE false
 #   define acl_from_mode(mode) (NULL)
Index: lib/file-has-acl.c
===================================================================
--- lib/file-has-acl.c.orig	2012-03-09 08:31:00.000000000 +0100
+++ lib/file-has-acl.c	2012-04-16 13:17:12.471016513 +0200
@@ -492,12 +492,20 @@ file_has_acl (char const *name, struct s
       /* Linux, FreeBSD, MacOS X, IRIX, Tru64 */
       int ret;
 
-      if (HAVE_ACL_EXTENDED_FILE) /* Linux */
+      if (HAVE_ACL_EXTENDED_FILE || HAVE_ACL_EXTENDED_FILE_NOFOLLOW) /* Linux */
         {
+#  if HAVE_ACL_EXTENDED_FILE_NOFOLLOW
+          /* acl_extended_file_nofollow() uses lgetxattr() in order to prevent
+             unnecessary mounts, but it returns the same result as we already
+             know that NAME is not a symbolic link at this point (modulo the
+             TOCTTOU race condition).  */
+          ret = acl_extended_file_nofollow (name);
+#  else
           /* On Linux, acl_extended_file is an optimized function: It only
              makes two calls to getxattr(), one for ACL_TYPE_ACCESS, one for
              ACL_TYPE_DEFAULT.  */
           ret = acl_extended_file (name);
+#  endif
         }
       else /* FreeBSD, MacOS X, IRIX, Tru64 */
         {
Index: m4/acl.m4
===================================================================
--- m4/acl.m4.orig	2012-01-06 10:14:31.000000000 +0100
+++ m4/acl.m4	2012-04-16 13:17:12.471016513 +0200
@@ -33,7 +33,7 @@ AC_DEFUN([gl_FUNC_ACL],
            AC_CHECK_FUNCS(
              [acl_get_file acl_get_fd acl_set_file acl_set_fd \
               acl_free acl_from_mode acl_from_text \
-              acl_delete_def_file acl_extended_file \
+              acl_delete_def_file acl_extended_file acl_extended_file_nofollow \
               acl_delete_fd_np acl_delete_file_np \
               acl_copy_ext_native acl_create_entry_np \
               acl_to_short_text acl_free_text])
Index: ChangeLog
===================================================================
--- ChangeLog.orig	2012-03-26 14:15:03.000000000 +0200
+++ ChangeLog	2012-04-16 13:17:12.474016441 +0200
@@ -2815,6 +2815,14 @@
 	MacOS X 10.7 has an fdatasync that is not declared, and is rumored to
 	be ineffective.  (Bug#9141)
 
+2011-07-22  Kamil Dudka  <kdudka@redhat.com>
+
+	file-has-acl: use acl_extended_file_nofollow if available
+	* lib/acl-internal.h (HAVE_ACL_EXTENDED_FILE): New macro.
+	(acl_extended_file): New macro.
+	* lib/file-has-acl.c (file_has_acl): Use acl_extended_file_nofollow.
+	* m4/acl.m4 (gl_FUNC_ACL): Check for acl_extended_file_nofollow.
+
 2011-07-20  Mike Frysinger  <vapier@gentoo.org>
 
 	dircolors: add screen.Eterm terminal type