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fix(libstore-tests): remove use-after-free bug for StringSource

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Unfortunately `StringSource` class is very easy was very easy to misuse
because the ctor took a plain `std::string_view` which has a bad habit
of being implicitly convertible from an rvalue `std::string`. This lead
to unintentional use-after-free bugs.

This patch makes `StringSource` much harder to misuse by disabling the ctor
from a `std::string &&` (but `const std::string &` is ok).

Fix affected tests from libstore-tests.
Reformat those tests with clangd's range formatting since the diff is tiny
and it seems appropriate.
This commit is contained in:
Sergei Zimmerman 2024-11-06 02:21:35 +03:00
parent e65510da56
commit 5bc8957c73
3 changed files with 16 additions and 22 deletions
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15
src/libstore-tests/serve-protocol.cc
View file

@ -459,21 +459,14 @@ TEST_F(ServeProtoTest, handshake_client_truncated_replay_throws)
CharacterizationTest::readTest("handshake-to-client", [&](std::string toClientLog) {
for (size_t len = 0; len < toClientLog.size(); ++len) {
NullBufferedSink nullSink;
StringSource in {
// truncate
toClientLog.substr(0, len)
};
auto substring = toClientLog.substr(0, len);
StringSource in{substring};
if (len < 8) {
EXPECT_THROW(
ServeProto::BasicClientConnection::handshake(
nullSink, in, defaultVersion, "blah"),
EndOfFile);
ServeProto::BasicClientConnection::handshake(nullSink, in, defaultVersion, "blah"), EndOfFile);
} else {
// Not sure why cannot keep on checking for `EndOfFile`.
EXPECT_THROW(
ServeProto::BasicClientConnection::handshake(
nullSink, in, defaultVersion, "blah"),
Error);
EXPECT_THROW(ServeProto::BasicClientConnection::handshake(nullSink, in, defaultVersion, "blah"), Error);
}
}
});

15
src/libstore-tests/worker-protocol.cc
View file

@ -725,21 +725,14 @@ TEST_F(WorkerProtoTest, handshake_client_truncated_replay_throws)
CharacterizationTest::readTest("handshake-to-client", [&](std::string toClientLog) {
for (size_t len = 0; len < toClientLog.size(); ++len) {
NullBufferedSink nullSink;
StringSource in {
// truncate
toClientLog.substr(0, len)
};
auto substring = toClientLog.substr(0, len);
StringSource in{substring};
if (len < 8) {
EXPECT_THROW(
WorkerProto::BasicClientConnection::handshake(
nullSink, in, defaultVersion, {}),
EndOfFile);
WorkerProto::BasicClientConnection::handshake(nullSink, in, defaultVersion, {}), EndOfFile);
} else {
// Not sure why cannot keep on checking for `EndOfFile`.
EXPECT_THROW(
WorkerProto::BasicClientConnection::handshake(
nullSink, in, defaultVersion, {}),
Error);
EXPECT_THROW(WorkerProto::BasicClientConnection::handshake(nullSink, in, defaultVersion, {}), Error);
}
}
});

8
src/libutil/serialise.hh
View file

@ -2,6 +2,7 @@
///@file
#include <memory>
#include <type_traits>
#include "types.hh"
#include "util.hh"
@ -202,7 +203,14 @@ struct StringSource : Source
{
std::string_view s;
size_t pos;
// NOTE: Prevent unintentional dangling views when an implicit conversion
// from std::string -> std::string_view occurs when the string is passed
// by rvalue.
StringSource(std::string &&) = delete;
StringSource(std::string_view s) : s(s), pos(0) { }
StringSource(const std::string& str): StringSource(std::string_view(str)) {}
size_t read(char * data, size_t len) override;
};