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Add a calloc self-test

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Add a very basic test of calloc to the selftest program. The selftest
program acts in its capacity as a platform compatibility checker rather
than in its capacity as a test of the library.

The main objective is to report whether calloc returns NULL for a size
of 0. Also observe whether a free/alloc sequence returns the address
that was just freed and whether a size overflow is properly detected.
This commit is contained in:
Gilles Peskine 2019-09-17 18:18:58 +02:00
parent c893235ea1
commit 583afe47cc
1 changed files with 83 additions and 0 deletions
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83
programs/test/selftest.c
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@ -65,6 +65,8 @@
#else
#include <stdio.h>
#include <stdlib.h>
#define mbedtls_calloc calloc
#define mbedtls_free free
#define mbedtls_printf printf
#define mbedtls_snprintf snprintf
#define mbedtls_exit exit
@ -77,6 +79,86 @@
#endif
#if defined MBEDTLS_SELF_TEST
/* Sanity check for malloc. This is not expected to fail, and is rather
* intended to display potentially useful information about the platform,
* in particular the behavior of malloc(0). */
static int calloc_self_test( int verbose )
{
int failures = 0;
void *empty1 = mbedtls_calloc( 0, 1 );
void *empty2 = mbedtls_calloc( 0, 1 );
void *buffer1 = mbedtls_calloc( 1, 1 );
void *buffer2 = mbedtls_calloc( 1, 1 );
uintptr_t old_buffer1;
if( empty1 == NULL && empty2 == NULL )
{
if( verbose )
mbedtls_printf( " CALLOC(0): passed (NULL)\n" );
}
else if( empty1 == NULL || empty2 == NULL )
{
if( verbose )
mbedtls_printf( " CALLOC(0): failed (mix of NULL and non-NULL)\n" );
++failures;
}
else if( empty1 == empty2 )
{
if( verbose )
mbedtls_printf( " CALLOC(0): passed (same non-null)\n" );
}
else
{
if( verbose )
mbedtls_printf( " CALLOC(0): passed (distinct non-null)\n" );
}
if( buffer1 == NULL || buffer2 == NULL )
{
if( verbose )
mbedtls_printf( " CALLOC(1): failed (NULL)\n" );
++failures;
}
else if( buffer1 == buffer2 )
{
if( verbose )
mbedtls_printf( " CALLOC(1): failed (same buffer twice)\n" );
++failures;
}
else
{
if( verbose )
mbedtls_printf( " CALLOC(1): passed\n" );
}
old_buffer1 = (uintptr_t) buffer1;
mbedtls_free( buffer1 );
buffer1 = mbedtls_calloc( 1, 1 );
if( buffer1 == NULL )
{
if( verbose )
mbedtls_printf( " CALLOC(1 again): failed (NULL)\n" );
++failures;
}
else
{
if( verbose )
mbedtls_printf( " CALLOC(1 again): passed (%s address)\n",
(uintptr_t) old_buffer1 == (uintptr_t) buffer1 ?
"same" : "different" );
}
if( verbose )
mbedtls_printf( "\n" );
mbedtls_free( empty1 );
mbedtls_free( empty2 );
mbedtls_free( buffer1 );
mbedtls_free( buffer2 );
return( failures );
}
#endif /* MBEDTLS_SELF_TEST */
static int test_snprintf( size_t n, const char ref_buf[10], int ref_ret )
{
int ret;
@ -173,6 +255,7 @@ typedef struct
const selftest_t selftests[] =
{
{"calloc", calloc_self_test},
#if defined(MBEDTLS_MD2_C)
{"md2", mbedtls_md2_self_test},
#endif