nlohmann / json / 35776605214

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Reject MessagePack/BSON binary subtypes that don't fit their wire format (#5469)

* Reject MessagePack/BSON binary subtypes that don't fit their wire format

Both formats store byte_container_with_subtype's subtype (a uint64_t)
in a single byte. The writers cast to std::int8_t/std::uint8_t without
a range check, so subtypes above 255 were silently truncated modulo
256 instead of raising an error. Throw out_of_range.413 instead when
the subtype exceeds the representable range of 0-255.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

* Move the new binary-subtype regression test out of unit-regression2.cpp

unit-regression2.cpp is already at the edge of what the MinGW linker
can relocate; adding this test's ~26 lines tips test-regression2_cpp20
(clang, Windows) over into "relocation truncated to fit:
IMAGE_REL_AMD64_REL32 against `.rdata'" (see 8ce64b9c1 / b82717c8a for
the same failure mode). Split the test along format lines instead:
MessagePack assertions move to unit-msgpack.cpp, BSON assertions to
unit-bson.cpp. The CBOR round-trip guard is dropped as redundant --
unit-cbor.cpp's "Tagged values" section already round-trips subtypes
up to 8589934590, far past the 70000 checked here.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

---------

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

Coverage Stats

2679 of 2920 branches covered (91.75%)

4 of 4 new or added lines in 1 file covered. (100.0%)

30 existing lines in 3 files now uncovered.

7452 of 7616 relevant lines covered (97.85%)

16766446.31 hits per line