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Extend mbedtls_calloc and mbedtls_free documentation

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Co-authored-by: Gilles Peskine <Gilles.Peskine@arm.com>
Signed-off-by: Andrzej Kurek <andrzej.kurek@arm.com>
This commit is contained in:
Andrzej Kurek 2023-04-27 09:19:35 -04:00
parent c08ccd00f3
commit 2d981f092e
2 changed files with 21 additions and 5 deletions
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23
include/mbedtls/mbedtls_config.h
View file

@ -3680,8 +3680,23 @@
/* Platform options */
//#define MBEDTLS_PLATFORM_STD_MEM_HDR <stdlib.h> /**< Header to include if MBEDTLS_PLATFORM_NO_STD_FUNCTIONS is defined. Don't define if no header is needed. */
//#define MBEDTLS_PLATFORM_STD_CALLOC calloc /**< Default allocator to use, can be undefined. Please note that it should zeroize the allocated buffer. */
//#define MBEDTLS_PLATFORM_STD_FREE free /**< Default free to use, can be undefined */
/** \def MBEDTLS_PLATFORM_STD_CALLOC
*
* Default allocator to use, can be undefined.
* It should initialize the allocated buffer memory to zeroes.
* The size of the buffer is the product of the two parameters.
* The behavior is undefined if the product of the two parameters overflows size_t.
* If the product is 0, the function may either return NULL or a valid pointer to an array of size 0 which is a valid input to the deallocation function.
* The corresponding deallocation function is MBEDTLS_PLATFORM_STD_FREE.
*/
//#define MBEDTLS_PLATFORM_STD_CALLOC calloc
/** \def MBEDTLS_PLATFORM_STD_FREE
*
* Default free to use, can be undefined.
* NULL is a valid parameter, and the function must do nothing.
* A non-null parameter will always be a pointer previously returned by MBEDTLS_PLATFORM_STD_CALLOC and not yet freed.
*/
//#define MBEDTLS_PLATFORM_STD_FREE free
//#define MBEDTLS_PLATFORM_STD_SETBUF setbuf /**< Default setbuf to use, can be undefined */
//#define MBEDTLS_PLATFORM_STD_EXIT exit /**< Default exit to use, can be undefined */
//#define MBEDTLS_PLATFORM_STD_TIME time /**< Default time to use, can be undefined. MBEDTLS_HAVE_TIME must be enabled */
@ -3697,8 +3712,8 @@
/* To Use Function Macros MBEDTLS_PLATFORM_C must be enabled */
/* MBEDTLS_PLATFORM_XXX_MACRO and MBEDTLS_PLATFORM_XXX_ALT cannot both be defined */
//#define MBEDTLS_PLATFORM_CALLOC_MACRO calloc /**< Default allocator macro to use, can be undefined */
//#define MBEDTLS_PLATFORM_FREE_MACRO free /**< Default free macro to use, can be undefined */
//#define MBEDTLS_PLATFORM_CALLOC_MACRO calloc /**< Default allocator macro to use, can be undefined. See MBEDTLS_PLATFORM_STD_CALLOC for requirements. */
//#define MBEDTLS_PLATFORM_FREE_MACRO free /**< Default free macro to use, can be undefined. See MBEDTLS_PLATFORM_STD_FREE for requirements. */
//#define MBEDTLS_PLATFORM_EXIT_MACRO exit /**< Default exit macro to use, can be undefined */
//#define MBEDTLS_PLATFORM_SETBUF_MACRO setbuf /**< Default setbuf macro to use, can be undefined */
//#define MBEDTLS_PLATFORM_TIME_MACRO time /**< Default time macro to use, can be undefined. MBEDTLS_HAVE_TIME must be enabled */

3
include/mbedtls/platform.h
View file

@ -135,7 +135,8 @@ extern "C" {
/*
* The function pointers for calloc and free.
* mbedtls_calloc will allocate and zeroize the buffer.
* please see MBEDTLS_PLATFORM_STD_CALLOC and MBEDTLS_PLATFORM_STD_FREE
* in mbedtls_config.h for more information about behaviour and requirements.
*/
#if defined(MBEDTLS_PLATFORM_MEMORY)
#if defined(MBEDTLS_PLATFORM_FREE_MACRO) && \