Re: [PATCH v13 04/20] libtasn1: changes for grub compatibility

[Stefan Berger]

On 4/25/24 04:01, Gary Lin via Grub-devel wrote:
> From: Daniel Axtens <dja@axtens.net>
>
> Do a few things to make libtasn1 compile as part of grub:
>
>   - remove _asn1_strcat and replace strcat with the bound-checked
>     _asn1_str_cat except the one inside _asn1_str_cat. That strcat is
>     replaced with strcpy.
>
>   - adjust header paths in libtasn1.h
>
>   - 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.
>
> Cc: Vladimir Serbinenko <phcoder@gmail.com>
> Signed-off-by: Daniel Axtens <dja@axtens.net>
> Signed-off-by: Gary Lin <glin@suse.com>

Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>

> ---
>   grub-core/lib/libtasn1/lib/decoding.c   | 8 ++++----
>   grub-core/lib/libtasn1/lib/element.c    | 2 +-
>   grub-core/lib/libtasn1/lib/gstr.c       | 2 +-
>   grub-core/lib/libtasn1/lib/int.h        | 3 +--
>   grub-core/lib/libtasn1/lib/parser_aux.c | 2 +-
>   include/grub/libtasn1.h                 | 5 ++---
>   6 files changed, 10 insertions(+), 12 deletions(-)
>
> diff --git a/grub-core/lib/libtasn1/lib/decoding.c 
> b/grub-core/lib/libtasn1/lib/decoding.c
> index bf9cb13ac..51859fe36 100644
> --- a/grub-core/lib/libtasn1/lib/decoding.c
> +++ b/grub-core/lib/libtasn1/lib/decoding.c
> @@ -2016,8 +2016,8 @@ 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);
> +         _asn1_str_cat (name, sizeof (name), ".");
> +         _asn1_str_cat (name, sizeof (name), p2->name);
>   
>   	  len = sizeof (value);
>           result = asn1_read_value (definitions, name, value, &len);
> @@ -2034,8 +2034,8 @@ asn1_expand_octet_string (asn1_node_const definitions, 
> asn1_node * element,
>               if (p2)
>                 {
>                   strcpy (name, definitions->name);
> -                 strcat (name, ".");
> -                 strcat (name, p2->name);
> +                 _asn1_str_cat (name, sizeof (name), ".");
> +                 _asn1_str_cat (name, sizeof (name), p2->name);
>   
>   		  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 bc4c3c8d7..8694fecb9 100644
> --- a/grub-core/lib/libtasn1/lib/element.c
> +++ b/grub-core/lib/libtasn1/lib/element.c
> @@ -688,7 +688,7 @@ asn1_write_value (asn1_node node_root, const char *name,
>                   return ASN1_MEM_ERROR; \
>           } else { \
>                   /* this strcat is checked */ \
> -                if (ptr) _asn1_strcat (ptr, data); \
> +                if (ptr) _asn1_str_cat ((char *)ptr, ptr_size, (const char 
> *)data); \
>           }
>   
>   /**
> diff --git a/grub-core/lib/libtasn1/lib/gstr.c 
> b/grub-core/lib/libtasn1/lib/gstr.c
> index eef419554..a9c16f5d3 100644
> --- a/grub-core/lib/libtasn1/lib/gstr.c
> +++ b/grub-core/lib/libtasn1/lib/gstr.c
> @@ -36,7 +36,7 @@ _asn1_str_cat (char *dest, size_t dest_tot_size, const char 
> *src)
>   
>     if (dest_tot_size - dest_size > str_size)
>       {
> -      strcat (dest, src);
> +      strcpy (dest + dest_size, src);
>       }
>     else
>       {
> diff --git a/grub-core/lib/libtasn1/lib/int.h b/grub-core/lib/libtasn1/lib/int.h
> index d94d51c8c..7409c7655 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 +115,6 @@ 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)
>   
>   # if SIZEOF_UNSIGNED_LONG_INT == 8
>   #  define _asn1_strtou64(n,e,b) strtoul((const char *) n, e, b)
> diff --git a/grub-core/lib/libtasn1/lib/parser_aux.c 
> b/grub-core/lib/libtasn1/lib/parser_aux.c
> index c05bd2339..e4e4c0556 100644
> --- a/grub-core/lib/libtasn1/lib/parser_aux.c
> +++ b/grub-core/lib/libtasn1/lib/parser_aux.c
> @@ -632,7 +632,7 @@ _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/include/grub/libtasn1.h b/include/grub/libtasn1.h
> index 058ab27b0..7d64b6ab7 100644
> --- a/include/grub/libtasn1.h
> +++ b/include/grub/libtasn1.h
> @@ -54,9 +54,8 @@
>   #  define __LIBTASN1_PURE__
>   # endif
>   
> -# include <sys/types.h>
> -# include <time.h>
> -# include <stdio.h>              /* for FILE* */
> +# include <grub/types.h>
> +# include <grub/time.h>
>   
>   # ifdef __cplusplus
>   extern "C"