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/*
* Copyright (c) 2010 SURFnet bv
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
* IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*****************************************************************************
salloc.cpp
Contains an implementation of malloc that allocates memory securely
*****************************************************************************/
#include "config.h"
#include "log.h"
#include "salloc.h"
#include <limits>
#if defined(SENSITIVE_NON_PAGED) && !defined(_WIN32)
#include <sys/mman.h>
#endif // SENSITIVE_NON_PAGED
#include <string.h>
#include "SecureMemoryRegistry.h"
// Allocate memory
void* salloc(size_t len)
{
#ifdef SENSITIVE_NON_PAGED
// Allocate memory on a page boundary
#ifndef _WIN32
void* ptr = (void*) valloc(len);
#else
pointer r = (pointer) VirtualAlloc(NULL, n * sizeof(T), MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE);
#endif
if (ptr == NULL)
{
ERROR_MSG("Out of memory");
return NULL;
}
// Lock the memory so it doesn't get swapped out
#ifndef _WIN32
if (mlock((const void*) ptr, len) != 0)
#else
if (VirtualLock((const void*) r, n * sizeof(T)) == 0)
#endif
{
ERROR_MSG("Could not allocate non-paged memory for secure storage");
// Hmmm... best to not return any allocated space in this case
#ifndef _WIN32
free(ptr);
#else
VirtualFree((const void*) pre, MEM_RELEASE);
#endif
return NULL;
}
// Register the memory in the secure memory registry
SecureMemoryRegistry::i()->add(ptr, len);
return ptr;
#else
void* ptr = (void*) malloc(len);
if (ptr == NULL)
{
ERROR_MSG("Out of memory");
return NULL;
}
// Register the memory in the secure memory registry
SecureMemoryRegistry::i()->add(ptr, len);
return ptr;
#endif // SENSITIVE_NON_PAGED
}
// Free memory
void sfree(void* ptr)
{
// Unregister the memory from the secure memory registry
size_t len = SecureMemoryRegistry::i()->remove(ptr);
#ifdef PARANOID
// First toggle all bits on
memset(ptr, 0xFF, len);
#endif // PARANOID
// Toggle all bits off
memset(ptr, 0x00, len);
#ifdef SENSITIVE_NON_PAGED
#ifndef _WIN32
munlock((const void*) ptr, len);
#else
VirtualFree((const void*) pre, MEM_RELEASE);
#endif
#endif // SENSITIVE_NON_PAGED
free(ptr);
}
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