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test(libkernel): read absolute links into a buffer that fits

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Maz committed 2026-10-17 17:06:37 +04:00
1 parent 6e331b3823
commit dd70ca83fe
1 file changed
+11 -6
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core/libs/tests/GuestKernelSys.cpp
+11 -6
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@@ -289,13 +289,18 @@ int main() {
const auto absolute = std::filesystem::absolute(root / "absolute");
Require(CreateSymbolicLinkW(absolute.wstring().c_str(), std::filesystem::absolute(original).wstring().c_str(),
SYMBOLIC_LINK_FLAG_ALLOW_UNPRIVILEGED_CREATE) != 0);
std::memset(buffer, '#', sizeof(buffer));
const auto absoluteLength = readlink_nid_postfix((root / "absolute").string().c_str(), buffer, sizeof(buffer));
Require(absoluteLength > 0 && static_cast<std::size_t>(absoluteLength) < sizeof(buffer) && buffer[absoluteLength] == '#');
const std::string absoluteTarget(buffer, static_cast<std::size_t>(absoluteLength));
Require(absoluteTarget.find('?') == std::string::npos);
char absoluteBuffer[512];
std::memset(absoluteBuffer, '#', sizeof(absoluteBuffer));
const auto absoluteLength = readlink_nid_postfix((root / "absolute").string().c_str(), absoluteBuffer, sizeof(absoluteBuffer));
const bool absoluteFits = absoluteLength > 0 && static_cast<std::size_t>(absoluteLength) < sizeof(absoluteBuffer) &&
absoluteBuffer[absoluteLength] == '#';
const std::string absoluteTarget = absoluteFits ? std::string(absoluteBuffer, static_cast<std::size_t>(absoluteLength)) : std::string();
std::error_code absoluteError;
Require(std::filesystem::equivalent(absoluteTarget, original, absoluteError) && !absoluteError);
const bool absoluteMatches = absoluteFits && absoluteTarget.find('?') == std::string::npos &&
std::filesystem::equivalent(absoluteTarget, original, absoluteError) && !absoluteError;
if (!absoluteMatches)
std::fprintf(stderr, "absolute link returned %lld bytes\n", static_cast<long long>(absoluteLength));
Require(absoluteMatches);
#else
Require(std::filesystem::is_symlink(std::filesystem::symlink_status(symbolic)));
Require(readlink_nid_postfix(symbolic.c_str(), buffer, sizeof(buffer)) == 12 && std::memcmp(buffer, "original.bin", 12) == 0);