githubmirror/gnutls

lib/mem.h
108 строк3 KB
Daiki Ueno
mem: make _gnutls_take_pointer type safer
26 мар 2026, 16:32
26 мар 2026, 16:3262709df
/*
 * Copyright (C) 2000-2012 Free Software Foundation, Inc.
 *
 * Author: Nikos Mavrogiannopoulos
 *
 * This file is part of GnuTLS.
 *
 * The GnuTLS is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>
 *
 */

#ifndef GNUTLS_LIB_MEM_H
#define GNUTLS_LIB_MEM_H

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <stddef.h>
#include <stdint.h>

#ifdef HAVE_SANITIZER_ASAN_INTERFACE_H
#include <sanitizer/asan_interface.h>
#endif

#ifdef HAVE_VALGRIND_MEMCHECK_H
#include <valgrind/memcheck.h>
#endif

#include "attribute.h"

/* These realloc functions will return ptr if size==0, and will free
 * the ptr if the new allocation failed.
 */
void *gnutls_realloc_fast(void *ptr, size_t size);
void *_gnutls_reallocarray_fast(void *ptr, size_t nmemb, size_t size);

char *_gnutls_strdup(const char *);

void *_gnutls_reallocarray(void *, size_t, size_t);

unsigned _gnutls_mem_is_zero(const uint8_t *ptr, unsigned size);

#define zrelease_mpi_key(mpi)             \
	if (*mpi != NULL) {               \
		_gnutls_mpi_clear(*mpi);  \
		_gnutls_mpi_release(mpi); \
	}

#define zeroize_key(x, size) gnutls_memset(x, 0, size)

static inline void _gnutls_memory_mark_undefined(void *addr, size_t size)
{
#ifdef HAVE_SANITIZER_ASAN_INTERFACE_H
	ASAN_POISON_MEMORY_REGION(addr, size);
#endif
#ifdef HAVE_VALGRIND_MEMCHECK_H
	if (RUNNING_ON_VALGRIND)
		VALGRIND_MAKE_MEM_UNDEFINED(addr, size);
#endif
}

static inline void _gnutls_memory_mark_defined(void *addr, size_t size)
{
#ifdef HAVE_SANITIZER_ASAN_INTERFACE_H
	ASAN_UNPOISON_MEMORY_REGION(addr, size);
#endif
#ifdef HAVE_VALGRIND_MEMCHECK_H
	if (RUNNING_ON_VALGRIND)
		VALGRIND_MAKE_MEM_DEFINED(addr, size);
#endif
}

static inline ATTRIBUTE_NONNULL() void *_gnutls_take_pointer(void *src)
{
	void **ptr = (void **)src;
	void *dst;

	dst = *ptr;
	*ptr = NULL;

	return dst;
}

/* Type-safety */
#if (((defined __GNUC__ &&                                                    \
       __GNUC__ + (__GNUC_MINOR__ >= 1) > 3) /* both C and C++ mode */        \
      || (defined __clang__ && __clang_major__ >= 3 /* both C and C++ mode */ \
	  && !(defined __cplusplus &&                                         \
	       !defined __GNUC__))) /* except for clang-cl in C++ mode */     \
     && !defined __STRICT_ANSI__) /* but not with -std=c99 or -std=c11 */     \
	|| (defined __SUNPRO_C && __SUNPRO_C >= 0x5110) /* C mode */          \
	|| __STDC_VERSION__ >= 202311L /* C mode */
#define _gnutls_take_pointer(pp) ((typeof(*pp))(_gnutls_take_pointer)(pp))
#endif /* HAVE_TYPEOF */

#endif /* GNUTLS_LIB_MEM_H */