LCOV - code coverage report
Current view: top level - src/support/allocators - secure.h (source / functions) Hit Total Coverage
Test: coverage.lcov Lines: 14 16 87.5 %
Date: 2022-04-21 14:51:19 Functions: 13 13 100.0 %
Legend: Modified by patch:
Lines: hit not hit | Branches: + taken - not taken # not executed

Not modified by patch:
Lines: hit not hit | Branches: + taken - not taken # not executed
Branches: 6 12 50.0 %

           Branch data     Line data    Source code
#       1                 :            : // Copyright (c) 2009-2010 Satoshi Nakamoto
#       2                 :            : // Copyright (c) 2009-2021 The Bitcoin Core developers
#       3                 :            : // Distributed under the MIT software license, see the accompanying
#       4                 :            : // file COPYING or http://www.opensource.org/licenses/mit-license.php.
#       5                 :            : 
#       6                 :            : #ifndef BITCOIN_SUPPORT_ALLOCATORS_SECURE_H
#       7                 :            : #define BITCOIN_SUPPORT_ALLOCATORS_SECURE_H
#       8                 :            : 
#       9                 :            : #include <support/lockedpool.h>
#      10                 :            : #include <support/cleanse.h>
#      11                 :            : 
#      12                 :            : #include <memory>
#      13                 :            : #include <string>
#      14                 :            : 
#      15                 :            : //
#      16                 :            : // Allocator that locks its contents from being paged
#      17                 :            : // out of memory and clears its contents before deletion.
#      18                 :            : //
#      19                 :            : template <typename T>
#      20                 :            : struct secure_allocator : public std::allocator<T> {
#      21                 :            :     using base = std::allocator<T>;
#      22                 :            :     using traits = std::allocator_traits<base>;
#      23                 :            :     using size_type = typename traits::size_type;
#      24                 :            :     using difference_type = typename traits::difference_type;
#      25                 :            :     using pointer = typename traits::pointer;
#      26                 :            :     using const_pointer = typename traits::const_pointer;
#      27                 :            :     using value_type = typename traits::value_type;
#      28                 :    1618559 :     secure_allocator() noexcept {}
#      29                 :     214295 :     secure_allocator(const secure_allocator& a) noexcept : base(a) {}
#      30                 :            :     template <typename U>
#      31                 :            :     secure_allocator(const secure_allocator<U>& a) noexcept : base(a)
#      32                 :            :     {
#      33                 :            :     }
#      34                 :    1832070 :     ~secure_allocator() noexcept {}
#      35                 :            :     template <typename _Other>
#      36                 :            :     struct rebind {
#      37                 :            :         typedef secure_allocator<_Other> other;
#      38                 :            :     };
#      39                 :            : 
#      40                 :            :     T* allocate(std::size_t n, const void* hint = 0)
#      41                 :    1718473 :     {
#      42                 :    1718473 :         T* allocation = static_cast<T*>(LockedPoolManager::Instance().alloc(sizeof(T) * n));
#      43 [ -  + ][ -  + ]:    1718473 :         if (!allocation) {
#                 [ -  + ]
#      44                 :          0 :             throw std::bad_alloc();
#      45                 :          0 :         }
#      46                 :    1718473 :         return allocation;
#      47                 :    1718473 :     }
#      48                 :            : 
#      49                 :            :     void deallocate(T* p, std::size_t n)
#      50                 :    1717645 :     {
#      51 [ +  - ][ +  - ]:    1717645 :         if (p != nullptr) {
#                 [ +  - ]
#      52                 :    1717645 :             memory_cleanse(p, sizeof(T) * n);
#      53                 :    1717645 :         }
#      54                 :    1717645 :         LockedPoolManager::Instance().free(p);
#      55                 :    1717645 :     }
#      56                 :            : };
#      57                 :            : 
#      58                 :            : // This is exactly like std::string, but with a custom allocator.
#      59                 :            : typedef std::basic_string<char, std::char_traits<char>, secure_allocator<char> > SecureString;
#      60                 :            : 
#      61                 :            : #endif // BITCOIN_SUPPORT_ALLOCATORS_SECURE_H

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