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ByteSlice: Fix persisting ptr to std::moved SSO buffer

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The Bug:
1. Construct `byte_slice.portion_` with `epee::span(buffer)` which copies a pointer to the SSO buffer to `byte_slice.portion_`
2. It constructs `byte_slice.storage_` with `std::move(buffer)` (normally this swap pointers, but SSO means a memcpy and clear on the original SSO buffer)
3. `slice.data()` returns a pointer from `slice.portion_` that points to the original SSO cleared buffer, `slice.storage_` has the actual string.
This commit is contained in:
Doyle 2020-05-19 18:45:32 +10:00
parent dbba6004f5
commit 15538f7e3f
2 changed files with 27 additions and 1 deletions
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5
contrib/epee/src/byte_slice.cpp
View file

@ -133,10 +133,13 @@ namespace epee
template<typename T>
byte_slice::byte_slice(const adapt_buffer, T&& buffer)
: storage_(nullptr), portion_(to_byte_span(to_span(buffer)))
: storage_(nullptr), portion_(nullptr)
{
if (!buffer.empty())
{
storage_ = allocate_slice<adapted_byte_slice<T>>(0, std::move(buffer));
portion_ = to_byte_span(to_span(static_cast<adapted_byte_slice<T> *>(storage_.get())->buffer));
}
}
byte_slice::byte_slice(std::initializer_list<span<const std::uint8_t>> sources)

23
tests/unit_tests/epee_utils.cpp
View file

@ -387,6 +387,29 @@ TEST(ByteSlice, Construction)
EXPECT_FALSE(std::is_copy_assignable<epee::byte_slice>());
}
TEST(ByteSlice, DataReturnedMatches)
{
for (int i = 64; i > 0; i--)
{
std::string sso_string(i, 'a');
std::string original = sso_string;
epee::byte_slice slice{std::move(sso_string)};
EXPECT_EQ(slice.size(), original.size());
EXPECT_EQ(memcmp(slice.data(), original.data(), original.size()), 0);
}
for (int i = 64; i > 0; i--)
{
std::vector<uint8_t> sso_vector(i, 'a');
std::vector<uint8_t> original = sso_vector;
epee::byte_slice slice{std::move(sso_vector)};
EXPECT_EQ(slice.size(), original.size());
EXPECT_EQ(memcmp(slice.data(), original.data(), original.size()), 0);
}
}
TEST(ByteSlice, NoExcept)
{
EXPECT_TRUE(std::is_nothrow_default_constructible<epee::byte_slice>());