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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2021 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#ifndef BITCOIN_SUPPORT_ALLOCATORS_SECURE_H
#define BITCOIN_SUPPORT_ALLOCATORS_SECURE_H
#include <support/lockedpool.h>
#include <support/cleanse.h>
#include <memory>
#include <string>
//
// Allocator that locks its contents from being paged
// out of memory and clears its contents before deletion.
//
template <typename T>
struct secure_allocator {
using value_type = T;
secure_allocator() = default;
template <typename U>
secure_allocator(const secure_allocator<U>&) noexcept {}
T* allocate(std::size_t n)
{
T* allocation = static_cast<T*>(LockedPoolManager::Instance().alloc(sizeof(T) * n));
if (!allocation) {
throw std::bad_alloc();
}
return allocation;
}
void deallocate(T* p, std::size_t n)
{
if (p != nullptr) {
memory_cleanse(p, sizeof(T) * n);
}
LockedPoolManager::Instance().free(p);
}
template <typename U>
friend bool operator==(const secure_allocator&, const secure_allocator<U>&) noexcept
{
return true;
}
template <typename U>
friend bool operator!=(const secure_allocator&, const secure_allocator<U>&) noexcept
{
return false;
}
};
// This is exactly like std::string, but with a custom allocator.
// TODO: Consider finding a way to make incoming RPC request.params[i] mlock()ed as well
typedef std::basic_string<char, std::char_traits<char>, secure_allocator<char> > SecureString;
template<typename T>
struct SecureUniqueDeleter {
void operator()(T* t) noexcept {
secure_allocator<T>().deallocate(t, 1);
}
};
template<typename T>
using secure_unique_ptr = std::unique_ptr<T, SecureUniqueDeleter<T>>;
template<typename T, typename... Args>
secure_unique_ptr<T> make_secure_unique(Args&&... as)
{
T* p = secure_allocator<T>().allocate(1);
// initialize in place, and return as secure_unique_ptr
try {
return secure_unique_ptr<T>(new (p) T(std::forward(as)...));
} catch (...) {
secure_allocator<T>().deallocate(p, 1);
throw;
}
}
#endif // BITCOIN_SUPPORT_ALLOCATORS_SECURE_H
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