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portable_storage: add some sanity checks on data size

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especially when allocated size is >> serialized data size
This commit is contained in:
moneromooo-monero 2020-12-25 17:20:24 +00:00
parent ee8d740cba
commit d5be31ee21
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1 changed files with 35 additions and 1 deletions
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36
contrib/epee/include/storages/portable_storage_from_bin.h
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@ -37,11 +37,32 @@
#else
#define EPEE_PORTABLE_STORAGE_RECURSION_LIMIT_INTERNAL 100
#endif
#define EPEE_PORTABLE_STORAGE_OBJECT_LIMIT_INTERNAL 65536
#define EPEE_PORTABLE_STORAGE_ARRAY_ELEMENT_LIMIT_INTERNAL 65536
namespace epee
{
namespace serialization
{
template<typename T>
struct ps_min_bytes {
static constexpr const size_t strict = 4096; // actual low bound
static constexpr const size_t rough = 4096; // when we want to be stricter for DoS prevention
};
template<> struct ps_min_bytes<uint64_t> { static constexpr const size_t strict = 8, rough = 8; };
template<> struct ps_min_bytes<int64_t> { static constexpr const size_t strict = 8, rough = 8; };
template<> struct ps_min_bytes<uint32_t> { static constexpr const size_t strict = 4, rough = 4; };
template<> struct ps_min_bytes<int32_t> { static constexpr const size_t strict = 4, rough = 4; };
template<> struct ps_min_bytes<uint16_t> { static constexpr const size_t strict = 2, rough = 2; };
template<> struct ps_min_bytes<int16_t> { static constexpr const size_t strict = 2, rough = 2; };
template<> struct ps_min_bytes<uint8_t> { static constexpr const size_t strict = 1, rough = 1; };
template<> struct ps_min_bytes<int8_t> { static constexpr const size_t strict = 1, rough = 1; };
template<> struct ps_min_bytes<double> { static constexpr const size_t strict = 8, rough = 8; };
template<> struct ps_min_bytes<bool> { static constexpr const size_t strict = 1, rough = 1; };
template<> struct ps_min_bytes<std::string> { static constexpr const size_t strict = 2, rough = 16; };
template<> struct ps_min_bytes<section> { static constexpr const size_t strict = 1, rough = 256; };
template<> struct ps_min_bytes<array_entry> { static constexpr const size_t strict = 1, rough = 128; };
struct throwable_buffer_reader
{
throwable_buffer_reader(const void* ptr, size_t sz);
@ -61,6 +82,8 @@ namespace epee
void read(section& sec);
void read(std::string& str);
void read(array_entry &ae);
template<class t_type>
size_t min_bytes() const;
private:
struct recursuion_limitation_guard
{
@ -81,6 +104,8 @@ namespace epee
const uint8_t* m_ptr;
size_t m_count;
size_t m_recursion_count;
size_t m_objects;
size_t m_array_elements;
};
inline throwable_buffer_reader::throwable_buffer_reader(const void* ptr, size_t sz)
@ -92,6 +117,8 @@ namespace epee
m_ptr = (uint8_t*)ptr;
m_count = sz;
m_recursion_count = 0;
m_objects = 0;
m_array_elements = 0;
}
inline
void throwable_buffer_reader::read(void* target, size_t count)
@ -138,7 +165,12 @@ namespace epee
//for pod types
array_entry_t<type_name> sa;
size_t size = read_varint();
CHECK_AND_ASSERT_THROW_MES(size <= m_count, "Size sanity check failed");
CHECK_AND_ASSERT_THROW_MES(size < EPEE_PORTABLE_STORAGE_ARRAY_ELEMENT_LIMIT_INTERNAL - m_array_elements, "Too many array elements");
m_array_elements += size;
CHECK_AND_ASSERT_THROW_MES(size <= m_count / ps_min_bytes<type_name>::strict, "Size sanity check failed");
const size_t threshold = 16384 - std::min<size_t>(m_array_elements, 16384);
CHECK_AND_ASSERT_THROW_MES(size <= threshold || size <= m_count / ps_min_bytes<type_name>::rough, "Large array stricter size sanity check failed");
sa.reserve(size);
//TODO: add some optimization here later
while(size--)
@ -263,6 +295,8 @@ namespace epee
RECURSION_LIMITATION();
sec.m_entries.clear();
size_t count = read_varint();
CHECK_AND_ASSERT_THROW_MES(count < EPEE_PORTABLE_STORAGE_OBJECT_LIMIT_INTERNAL - m_objects, "Too many objects");
m_objects += count;
while(count--)
{
//read section name string