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validate BSON document size against the bytes read (#5287)

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Angadi56
2026-07-23 19:51:40 +00:00
committed by GitHub
parent 3296a3ad8c
commit 9a3ebb9456
3 changed files with 132 additions and 0 deletions
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tests/src/unit-bson.cpp
+56
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@@ -854,6 +854,62 @@ TEST_CASE("Unsupported BSON input")
CHECK(!json::sax_parse(bson, &scp, json::input_format_t::bson));
}
TEST_CASE("BSON document size mismatch")
{
json _;
SECTION("top-level document declaring more bytes than it contains")
{
// empty object, but the length prefix claims 6 bytes instead of 5
std::vector<std::uint8_t> const input = {0x06, 0x00, 0x00, 0x00, 0x00};
CHECK_THROWS_WITH_AS(_ = json::from_bson(input), "[json.exception.parse_error.112] parse error at byte 5: syntax error while parsing BSON document: document size 6 does not match the number of bytes read (5)", json::parse_error&);
CHECK(json::from_bson(input, true, false).is_discarded());
}
SECTION("top-level document with a negative size")
{
std::vector<std::uint8_t> const input = {0xFF, 0xFF, 0xFF, 0xFF, 0x00};
CHECK_THROWS_WITH_AS(_ = json::from_bson(input), "[json.exception.parse_error.112] parse error at byte 5: syntax error while parsing BSON document: document size -1 does not match the number of bytes read (5)", json::parse_error&);
CHECK(json::from_bson(input, true, false).is_discarded());
}
SECTION("embedded document whose size disagrees with its terminator")
{
// the embedded document "d" declares 0x7FFFFFFF bytes but its 0x00
// terminator falls right after {"a":null}; the length prefix would
// otherwise let the following "h" element be read as a member of the
// enclosing document instead of "d"
std::vector<std::uint8_t> const input =
{
0x00, 0x00, 0x00, 0x00, // outer size
0x03, 'd', 0x00, // entry: embedded document "d"
0xFF, 0xFF, 0xFF, 0x7F, // embedded size 0x7FFFFFFF
0x0A, 'a', 0x00, // entry: null "a"
0x00, // embedded end marker
0x08, 'h', 0x00, 0x01, // entry: bool "h" = true
0x00 // outer end marker
};
CHECK_THROWS_WITH_AS(_ = json::from_bson(input), "[json.exception.parse_error.112] parse error at byte 15: syntax error while parsing BSON document: document size 2147483647 does not match the number of bytes read (8)", json::parse_error&);
CHECK(json::from_bson(input, true, false).is_discarded());
}
SECTION("embedded array whose size disagrees with its terminator")
{
// array [42] is 12 bytes, but the length prefix claims 13
std::vector<std::uint8_t> const input =
{
0x00, 0x00, 0x00, 0x00, // outer size
0x04, 'a', 0x00, // entry: array "a"
0x0D, 0x00, 0x00, 0x00, // array size 13 (real is 12)
0x10, '0', 0x00, 0x2A, 0x00, 0x00, 0x00, // entry: int32 "0" = 42
0x00, // array end marker
0x00 // outer end marker
};
CHECK_THROWS_WITH_AS(_ = json::from_bson(input), "[json.exception.parse_error.112] parse error at byte 19: syntax error while parsing BSON document: document size 13 does not match the number of bytes read (12)", json::parse_error&);
CHECK(json::from_bson(input, true, false).is_discarded());
}
}
TEST_CASE("BSON numerical data")
{
SECTION("number")