libtasn1: Import libtasn1-4.19.0

Import a very trimmed-down set of libtasn1 files:

  curl -L -O https://ftp.gnu.org/gnu/libtasn1/libtasn1-4.19.0.tar.gz
  tar xvzf libtasn1-4.19.0.tar.gz
  rm -rf grub-core/lib/libtasn1
  mkdir -p grub-core/lib/libtasn1/lib
  mkdir -p grub-core/lib/libtasn1/tests
  cp libtasn1-4.19.0/{README.md,COPYING} grub-core/lib/libtasn1
  cp libtasn1-4.19.0/lib/{coding.c,decoding.c,element.c,element.h,errors.c,gstr.c,gstr.h,int.h,parser_aux.c,parser_aux.h,structure.c,structure.h} grub-core/libtasn1/lib
  cp libtasn1-4.19.0/lib/includes/libtasn1.h grub-core/lib/libtasn1
  cp libtasn1-4.19.0/tests/{CVE-2018-1000654-1_asn1_tab.h,CVE-2018-1000654-2_asn1_tab.h,CVE-2018-1000654.c,object-id-decoding.c,object-id-encoding.c,octet-string.c,reproducers.c,Test_overflow.c,Test_simple.c,Test_strings.c} grub-core/lib/libtasn1/tests
  rm -rf libtasn1-4.19.0*

Signed-off-by: Daniel Axtens <dja@axtens.net>
Signed-off-by: Gary Lin <glin@suse.com>
Reviewed-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
Tested-by: Stefan Berger <stefanb@linux.ibm.com>

grub-core/lib/libtasn1/tests/reproducers.c

@@ -0,0 +1,90 @@
+/*
+ * Copyright (C) 2019-2022 Free Software Foundation, Inc.
+ *
+ * This file is part of LIBTASN1.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+/****************************************************************/
+/* Description: run reproducers for several fixed issues        */
+/****************************************************************/
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+
+#include <libtasn1.h>
+
+#include <int.h>
+
+/* produces endless loop (fixed by d4b624b2):
+ * The following translates into a single node with all pointers
+ * (right,left,down) set to NULL. */
+const asn1_static_node endless_asn1_tab[] = {
+  {"TEST_TREE", 536875024, NULL},
+  {NULL, 0, NULL}
+};
+
+/* produces memory leak (fixed by f16d1ff9):
+ * 152 bytes in 1 blocks are definitely lost in loss record 1 of 1
+ *    at 0x4837B65: calloc (vg_replace_malloc.c:762)
+ *    by 0x4851C0D: _asn1_add_static_node (parser_aux.c:71)
+ *    by 0x4853AAC: asn1_array2tree (structure.c:200)
+ *    by 0x10923B: main (single_node.c:67)
+ */
+const asn1_static_node tab[] = {
+  {"a", CONST_DOWN, ""},
+  {"b", 0, ""},
+  {"c", 0, ""},
+  {NULL, 0, NULL}
+};
+
+int
+main (int argc, char *argv[])
+{
+  int result, verbose = 0;
+  asn1_node definitions = NULL;
+  char errorDescription[ASN1_MAX_ERROR_DESCRIPTION_SIZE];
+
+  if (argc > 1)
+    verbose = 1;
+
+  result = asn1_array2tree (endless_asn1_tab, &definitions, errorDescription);
+  if (result != ASN1_SUCCESS)
+    {
+      asn1_perror (result);
+      printf ("ErrorDescription = %s\n\n", errorDescription);
+      exit (EXIT_FAILURE);
+    }
+
+  asn1_delete_structure (&definitions);
+
+  definitions = NULL;
+  result = asn1_array2tree (tab, &definitions, errorDescription);
+  if (result != ASN1_SUCCESS)
+    {
+      asn1_perror (result);
+      printf ("ErrorDescription = %s\n\n", errorDescription);
+      exit (EXIT_FAILURE);
+    }
+
+  asn1_delete_structure (&definitions);
+
+  if (verbose)
+    printf ("Success\n");
+
+  exit (EXIT_SUCCESS);
+}