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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 : public std::allocator<T> {
using base = std::allocator<T>;
using traits = std::allocator_traits<base>;
using size_type = typename traits::size_type;
using difference_type = typename traits::difference_type;
using pointer = typename traits::pointer;
using const_pointer = typename traits::const_pointer;
using value_type = typename traits::value_type;
secure_allocator() noexcept {}
secure_allocator(const secure_allocator& a) noexcept : base(a) {}
template <typename U>
secure_allocator(const secure_allocator<U>& a) noexcept : base(a)
{
}
~secure_allocator() noexcept {}
template <typename _Other>
struct rebind {
typedef secure_allocator<_Other> other;
};
T* allocate(std::size_t n, const void* hint = nullptr)
{
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);
}
};
// 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;
#endif // BITCOIN_SUPPORT_ALLOCATORS_SECURE_H
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