From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001

From: Daniel Axtens <dja@axtens.net>

Date: Fri, 1 May 2020 20:44:29 +1000

Subject: [PATCH] libtasn1: changes for grub compatibility

Do a few things to make libtasn1 compile as part of grub:

 - replace strcat. grub removed strcat so replace it with the appropriate

   calls to memcpy and strlen.

 - replace c_isdigit with grub_isdigit (and don't import c-ctype from

   gnulib) grub_isdigit provides the same functionality as c_isdigit: it

   determines if the input is an ASCII digit without regard for locale.

 - replace GL_ATTRIBUTE_PURE with __attribute__((pure)) which been

   supported since gcc-2.96. This avoids messing around with gnulib.

 - adjust libtasn1.h: drop the ASN1_API logic, it's not needed for our

   modules. Unconditionally support const and pure attributes and adjust

   header paths.

 - adjust header paths to "grub/libtasn1.h".

 - replace a 64 bit division with a call to grub_divmod64, preventing

   creation of __udivdi3 calls on 32 bit platforms.

Signed-off-by: Daniel Axtens <dja@axtens.net>

---

 grub-core/lib/libtasn1/lib/decoding.c   | 11 ++++++-----

 grub-core/lib/libtasn1/lib/element.c    |  3 ++-

 grub-core/lib/libtasn1/lib/gstr.c       |  4 ++--

 grub-core/lib/libtasn1/lib/parser_aux.c |  7 ++++---

 grub-core/lib/libtasn1/lib/int.h        |  4 ++--

 include/grub/libtasn1.h                 | 26 ++++++--------------------

 6 files changed, 22 insertions(+), 33 deletions(-)

diff --git a/grub-core/lib/libtasn1/lib/decoding.c b/grub-core/lib/libtasn1/lib/decoding.c

index 42f9a92b5..7856858b2 100644

--- a/grub-core/lib/libtasn1/lib/decoding.c

+++ b/grub-core/lib/libtasn1/lib/decoding.c

@@ -32,7 +32,8 @@

 #include <element.h>

 #include <limits.h>

 #include <intprops.h>

-#include <c-ctype.h>

+

+#define c_isdigit grub_isdigit

 #ifdef DEBUG

 # define warn() fprintf(stderr, "%s: %d\n", __func__, __LINE__)

@@ -2008,8 +2009,8 @@ asn1_expand_octet_string (asn1_node_const definitions, asn1_node * element,

 	  (p2->type & CONST_ASSIGN))

 	{

 	  strcpy (name, definitions->name);

-	  strcat (name, ".");

-	  strcat (name, p2->name);

+	  memcpy (name + strlen(name), ".", sizeof(" . "));

+	  memcpy (name + strlen(name), p2->name, strlen(p2->name) + 1);

 	  len = sizeof (value);

 	  result = asn1_read_value (definitions, name, value, &len;;

@@ -2026,8 +2027,8 @@ asn1_expand_octet_string (asn1_node_const definitions, asn1_node * element,

 	      if (p2)

 		{

 		  strcpy (name, definitions->name);

-		  strcat (name, ".");

-		  strcat (name, p2->name);

+		  memcpy (name + strlen(name), ".", sizeof(" . "));

+		  memcpy (name + strlen(name), p2->name, strlen(p2->name) + 1);

 		  result = asn1_create_element (definitions, name, &aux;;

 		  if (result == ASN1_SUCCESS)

diff --git a/grub-core/lib/libtasn1/lib/element.c b/grub-core/lib/libtasn1/lib/element.c

index 539008d8e..ed761ff56 100644

--- a/grub-core/lib/libtasn1/lib/element.c

+++ b/grub-core/lib/libtasn1/lib/element.c

@@ -30,9 +30,10 @@

 #include "parser_aux.h"

 #include <gstr.h>

 #include "structure.h"

-#include "c-ctype.h"

 #include "element.h"

+#define c_isdigit grub_isdigit

+

 void

 _asn1_hierarchical_name (asn1_node_const node, char *name, int name_size)

 {

diff --git a/grub-core/lib/libtasn1/lib/gstr.c b/grub-core/lib/libtasn1/lib/gstr.c

index e91a3a151..e33875c2c 100644

--- a/grub-core/lib/libtasn1/lib/gstr.c

+++ b/grub-core/lib/libtasn1/lib/gstr.c

@@ -36,13 +36,13 @@ _asn1_str_cat (char *dest, size_t dest_tot_size, const char *src)

   if (dest_tot_size - dest_size > str_size)

     {

-      strcat (dest, src);

+      memcpy (dest + dest_size, src, str_size + 1);

     }

   else

     {

       if (dest_tot_size - dest_size > 0)

 	{

-	  strncat (dest, src, (dest_tot_size - dest_size) - 1);

+	  memcpy (dest + dest_size, src, (dest_tot_size - dest_size) - 1);

 	  dest[dest_tot_size - 1] = 0;

 	}

     }

diff --git a/grub-core/lib/libtasn1/lib/parser_aux.c b/grub-core/lib/libtasn1/lib/parser_aux.c

index d5dbbf876..89c9be69d 100644

--- a/grub-core/lib/libtasn1/lib/parser_aux.c

+++ b/grub-core/lib/libtasn1/lib/parser_aux.c

@@ -26,7 +26,8 @@

 #include "gstr.h"

 #include "structure.h"

 #include "element.h"

-#include "c-ctype.h"

+

+#define c_isdigit grub_isdigit

 char _asn1_identifierMissing[ASN1_MAX_NAME_SIZE + 1];	/* identifier name not found */

@@ -40,7 +41,7 @@ char _asn1_identifierMissing[ASN1_MAX_NAME_SIZE + 1];	/* identifier name not fou

 #ifdef __clang__

 __attribute__((no_sanitize("integer")))

 #endif

-_GL_ATTRIBUTE_PURE

+__attribute__((__pure__))

 static unsigned int

 _asn1_hash_name (const char *x)

 {

@@ -634,7 +635,7 @@ _asn1_ltostr (int64_t v, char str[LTOSTR_MAX_SIZE])

   count = 0;

   do

     {

-      d = val / 10;

+      d = grub_divmod64(val, 10, NULL);

       r = val - d * 10;

       temp[start + count] = '0' + (char) r;

       count++;

diff --git a/grub-core/lib/libtasn1/lib/int.h b/grub-core/lib/libtasn1/lib/int.h

index ea1625786..4a568efee 100644

--- a/grub-core/lib/libtasn1/lib/int.h

+++ b/grub-core/lib/libtasn1/lib/int.h

@@ -35,7 +35,7 @@

 #include <sys/types.h>

 #endif

-#include <libtasn1.h>

+#include "grub/libtasn1.h"

 #define ASN1_SMALL_VALUE_SIZE 16

@@ -115,7 +115,7 @@ extern const tag_and_class_st _asn1_tags[];

 #define _asn1_strtoul(n,e,b) strtoul((const char *) n, e, b)

 #define _asn1_strcmp(a,b) strcmp((const char *)a, (const char *)b)

 #define _asn1_strcpy(a,b) strcpy((char *)a, (const char *)b)

-#define _asn1_strcat(a,b) strcat((char *)a, (const char *)b)

+#define _asn1_strcat(a,b) memcpy((char *)a + strlen((const char *)a), (const char *)b, strlen((const char *)b) + 1)

 #if SIZEOF_UNSIGNED_LONG_INT == 8

 # define _asn1_strtou64(n,e,b) strtoul((const char *) n, e, b)

diff --git a/include/grub/libtasn1.h b/include/grub/libtasn1.h

index 785eda2ae..28dbf16c4 100644

--- a/include/grub/libtasn1.h

+++ b/include/grub/libtasn1.h

@@ -38,29 +38,15 @@

 #ifndef LIBTASN1_H

 #define LIBTASN1_H

-#ifndef ASN1_API

-#if defined ASN1_BUILDING && defined HAVE_VISIBILITY && HAVE_VISIBILITY

-#define ASN1_API __attribute__((__visibility__("default")))

-#elif defined ASN1_BUILDING && defined _MSC_VER && ! defined ASN1_STATIC

-#define ASN1_API __declspec(dllexport)

-#elif defined _MSC_VER && ! defined ASN1_STATIC

-#define ASN1_API __declspec(dllimport)

-#else

+/* grub: ASN1_API is not used */

 #define ASN1_API

-#endif

-#endif

-#ifdef __GNUC__

-# define __LIBTASN1_CONST__  __attribute__((const))

-# define __LIBTASN1_PURE__  __attribute__((pure))

-#else

-# define __LIBTASN1_CONST__

-# define __LIBTASN1_PURE__

-#endif

+/* grub: all our supported compilers support these attributes */

+#define __LIBTASN1_CONST__  __attribute__((const))

+#define __LIBTASN1_PURE__  __attribute__((pure))

-#include <sys/types.h>

-#include <time.h>

-#include <stdio.h>		/* for FILE* */

+#include <grub/types.h>

+#include <grub/time.h>

 #ifdef __cplusplus

 extern "C"