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Merge bitcoin/bitcoin#21795: fuzz: Terminate immediately if a fuzzing harness tries to perform a DNS lookup (belt and suspenders)

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3737d35fee fuzz: Terminate immediately if a fuzzing harness ever tries to perform a DNS lookup (belts and suspenders) (practicalswift)

Pull request description:

  Terminate immediately if a fuzzing harness tries to perform a DNS lookup (belt and suspenders).

  Obviously this _should_ never happen, but if it _does_ happen we want immediate termination instead of a DNS lookup :)

ACKs for top commit:
  MarcoFalke:
    review ACK 3737d35fee

Tree-SHA512: 51cd2d32def7f9f052e02f99c354656af1f807cc9fdf592ab765e620bfe660f1ed26e0484763f94aba650424b44959eafaf352bfd0f81aa273e350510e97356e
This commit is contained in:
MarcoFalke 2021-06-07 09:03:40 +02:00
commit 912cb59490
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1 changed files with 9 additions and 0 deletions
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9
src/test/fuzz/fuzz.cpp
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@ -13,6 +13,7 @@
#include <cstdint>
#include <exception>
#include <memory>
#include <string>
#include <unistd.h>
#include <vector>
@ -37,6 +38,14 @@ void initialize()
// Terminate immediately if a fuzzing harness ever tries to create a TCP socket.
CreateSock = [](const CService&) -> std::unique_ptr<Sock> { std::terminate(); };
// Terminate immediately if a fuzzing harness ever tries to perform a DNS lookup.
g_dns_lookup = [](const std::string& name, bool allow_lookup) {
if (allow_lookup) {
std::terminate();
}
return WrappedGetAddrInfo(name, false);
};
bool should_abort{false};
if (std::getenv("PRINT_ALL_FUZZ_TARGETS_AND_ABORT")) {
for (const auto& t : FuzzTargets()) {