From: Colin Watson <cjwatson@ubuntu.com>
Date: Mon, 13 Jan 2014 12:13:10 +0000
Subject: Read /etc/default/grub.d/*.cfg after /etc/default/grub

Bug-Ubuntu: https://bugs.launchpad.net/bugs/901600
Forwarded: no
Last-Update: 2021-09-24

Patch-Name: default-grub-d.patch
---
 grub-core/osdep/unix/config.c | 128 +++++++++++++++++++++++++++++++++++-------
 util/grub-mkconfig.in         |   5 ++
 2 files changed, 112 insertions(+), 21 deletions(-)

diff --git a/grub-core/osdep/unix/config.c b/grub-core/osdep/unix/config.c
index 0b1f761..a907364 100644
--- a/grub-core/osdep/unix/config.c
+++ b/grub-core/osdep/unix/config.c
@@ -24,6 +24,9 @@
 #include <grub/emu/config.h>
 #include <grub/util/install.h>
 #include <grub/util/misc.h>
+#include <grub/list.h>
+#include <grub/safemath.h>
+#include <assert.h>
 #include <string.h>
 #include <sys/types.h>
 #include <sys/wait.h>
@@ -61,13 +64,27 @@ grub_util_get_localedir (void)
   return LOCALEDIR;
 }
 
+struct cfglist
+{
+  struct cfglist *next;
+  struct cfglist *prev;
+  char *path;
+};
+
 void
 grub_util_load_config (struct grub_util_config *cfg)
 {
   pid_t pid;
   const char *argv[4];
-  char *script, *ptr;
+  char *script = NULL, *ptr;
   const char *cfgfile, *iptr;
+  char *cfgdir;
+  grub_util_fd_dir_t d;
+  struct cfglist *cfgpaths = NULL, *cfgpath, *next_cfgpath;
+  int num_cfgpaths = 0;
+  size_t len_cfgpaths = 0;
+  char **sorted_cfgpaths = NULL;
+  int i;
   FILE *f = NULL;
   int fd;
   const char *v;
@@ -83,29 +100,88 @@ grub_util_load_config (struct grub_util_config *cfg)
     cfg->grub_distributor = xstrdup (v);
 
   cfgfile = grub_util_get_config_filename ();
-  if (!grub_util_is_regular (cfgfile))
-    return;
+  if (grub_util_is_regular (cfgfile))
+    {
+      size_t sz;
+
+      ++num_cfgpaths;
+      sz = strlen (cfgfile);
+      if (grub_mul (sz, 4, &sz) ||
+	  grub_add (sz, sizeof (". ''; ") - 1, &sz) ||
+	  grub_add (len_cfgpaths, sz, &len_cfgpaths))
+	grub_util_error ("%s", _("overflow is detected"));
+    }
+
+  cfgdir = xasprintf ("%s.d", cfgfile);
+  d = grub_util_fd_opendir (cfgdir);
+  if (d)
+    {
+      grub_util_fd_dirent_t de;
+
+      while ((de = grub_util_fd_readdir (d)))
+	{
+	  const char *ext = strrchr (de->d_name, '.');
+	  size_t sz;
+
+	  if (!ext || strcmp (ext, ".cfg") != 0)
+	    continue;
+
+	  cfgpath = xmalloc (sizeof (*cfgpath));
+	  cfgpath->path = grub_util_path_concat (2, cfgdir, de->d_name);
+	  grub_list_push (GRUB_AS_LIST_P (&cfgpaths), GRUB_AS_LIST (cfgpath));
+	  ++num_cfgpaths;
+	  sz = strlen (cfgpath->path);
+	  if (grub_mul (sz, 4, &sz) ||
+	      grub_add (sz, sizeof (". ''; ") - 1, &sz) ||
+	      grub_add (len_cfgpaths, sz, &len_cfgpaths))
+	    grub_util_error ("%s", _("overflow is detected"));
+	}
+      grub_util_fd_closedir (d);
+    }
+
+  if (num_cfgpaths == 0)
+    goto out;
+
+  sorted_cfgpaths = xcalloc (num_cfgpaths, sizeof (*sorted_cfgpaths));
+  i = 0;
+  if (grub_util_is_regular (cfgfile))
+    sorted_cfgpaths[i++] = xstrdup (cfgfile);
+  FOR_LIST_ELEMENTS_SAFE (cfgpath, next_cfgpath, cfgpaths)
+    {
+      sorted_cfgpaths[i++] = cfgpath->path;
+      free (cfgpath);
+    }
+  assert (i == num_cfgpaths);
+  qsort (sorted_cfgpaths + 1, num_cfgpaths - 1, sizeof (*sorted_cfgpaths),
+	 (int (*) (const void *, const void *)) strcmp);
 
   argv[0] = "sh";
   argv[1] = "-c";
 
-  script = xcalloc (4, strlen (cfgfile) + 300);
+  if (grub_add (len_cfgpaths, 300, &len_cfgpaths))
+    grub_util_error ("%s", _("overflow is detected"));
+  script = xmalloc (len_cfgpaths);
 
   ptr = script;
-  memcpy (ptr, ". '", 3);
-  ptr += 3;
-  for (iptr = cfgfile; *iptr; iptr++)
+  for (i = 0; i < num_cfgpaths; i++)
     {
-      if (*iptr == '\\')
+      memcpy (ptr, ". '", 3);
+      ptr += 3;
+      for (iptr = sorted_cfgpaths[i]; *iptr; iptr++)
 	{
-	  memcpy (ptr, "'\\''", 4);
-	  ptr += 4;
-	  continue;
+	  if (*iptr == '\\')
+	    {
+	      memcpy (ptr, "'\\''", 4);
+	      ptr += 4;
+	      continue;
+	    }
+	  *ptr++ = *iptr;
 	}
-      *ptr++ = *iptr;
+      memcpy (ptr, "'; ", 3);
+      ptr += 3;
     }
 
-  strcpy (ptr, "'; printf \"GRUB_ENABLE_CRYPTODISK=%s\\nGRUB_DISTRIBUTOR=%s\\n\" "
+  strcpy (ptr, "printf \"GRUB_ENABLE_CRYPTODISK=%s\\nGRUB_DISTRIBUTOR=%s\\n\" "
 	  "\"$GRUB_ENABLE_CRYPTODISK\" \"$GRUB_DISTRIBUTOR\"");
 
   argv[2] = script;
@@ -125,15 +201,25 @@ grub_util_load_config (struct grub_util_config *cfg)
       waitpid (pid, NULL, 0);
     }
   if (f)
-    return;
+    goto out;
 
-  f = grub_util_fopen (cfgfile, "r");
-  if (f)
+  for (i = 0; i < num_cfgpaths; i++)
     {
-      grub_util_parse_config (f, cfg, 0);
-      fclose (f);
+      f = grub_util_fopen (sorted_cfgpaths[i], "r");
+      if (f)
+	{
+	  grub_util_parse_config (f, cfg, 0);
+	  fclose (f);
+	}
+      else
+	grub_util_warn (_("cannot open configuration file `%s': %s"),
+			cfgfile, strerror (errno));
     }
-  else
-    grub_util_warn (_("cannot open configuration file `%s': %s"),
-		    cfgfile, strerror (errno));
+
+out:
+  free (script);
+  for (i = 0; i < num_cfgpaths; i++)
+    free (sorted_cfgpaths[i]);
+  free (sorted_cfgpaths);
+  free (cfgdir);
 }
diff --git a/util/grub-mkconfig.in b/util/grub-mkconfig.in
index 32c480d..3e75e33 100644
--- a/util/grub-mkconfig.in
+++ b/util/grub-mkconfig.in
@@ -160,6 +160,11 @@ fi
 if test -f ${sysconfdir}/default/grub ; then
   . ${sysconfdir}/default/grub
 fi
+for x in ${sysconfdir}/default/grub.d/*.cfg ; do
+  if [ -e "${x}" ]; then
+    . "${x}"
+  fi
+done
 
 if [ "x${GRUB_DISABLE_UUID}" = "xtrue" ]; then
   if [ -z "${GRUB_DISABLE_LINUX_UUID}" ]; then