upstream/mercurial-mirror Files · contrib/fuzz/fuzzutil.h

fuzz: new fuzzer for cext/manifest.c...

fuzz: new fuzzer for cext/manifest.c This is a bit messy, because lazymanifest is tightly coupled to the cpython API for performance reasons. As a result, we have to build a whole Python without pymalloc (so ASAN can help us out) and link against that. Then we have to use an embedded Python interpreter. We could manually drive the lazymanifest in C from that point, but experimentally just using PyEval_EvalCode isn't really any slower so we may as well do that and write the innermost guts of the fuzzer in Python. Leak detection is currently disabled for this fuzzer because there are a few global-lifetime things in our extensions that we more or less intentionally leak and I didn't want to take the detour to work around that for now. This should not be pushed to our repo until https://github.com/google/oss-fuzz/pull/1853 is merged, as this depends on having the Python tarball around. Differential Revision: https://phab.mercurial-scm.org/D4879

Augie Fackler - - Load All Authors

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      #ifndef CONTRIB_FUZZ_FUZZUTIL_H

      #define CONTRIB_FUZZ_FUZZUTIL_H

      #include <iostream>

      #include <memory>

      #include <stdint.h>

      /* Try and use std::optional, but failing that assume we'll have a

       * workable https://abseil.io/ install on the include path to get

       * their backport of std::optional. */

      #ifdef __has_include

      #if __has_include(<optional>) && __cplusplus >= 201703L

      #include <optional>

      #define CONTRIB_FUZZ_HAVE_STD_OPTIONAL

      #endif

      #endif

      #ifdef CONTRIB_FUZZ_HAVE_STD_OPTIONAL

      namespace contrib

      {

      using std::nullopt;

      using std::optional;

      } /* namespace contrib */

      #else

      #include "third_party/absl/types/optional.h"

      namespace contrib

      {

      using absl::nullopt;

      using absl::optional;

      } /* namespace contrib */

      #endif

      /* set DEBUG to 1 for a few debugging prints, or 2 for a lot */

      #define DEBUG 0

      #define LOG(level)                                                             \

      	if (level <= DEBUG)                                                    \

      	std::cout

      struct two_inputs {

      	std::unique_ptr<char[]> right;

      	size_t right_size;

      	std::unique_ptr<char[]> left;

      	size_t left_size;

      };

      /* Split a non-zero-length input into two inputs. */

      contrib::optional<two_inputs> SplitInputs(const uint8_t *Data, size_t Size);

      #endif /* CONTRIB_FUZZ_FUZZUTIL_H */

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				#ifndef CONTRIB_FUZZ_FUZZUTIL_H
				#define CONTRIB_FUZZ_FUZZUTIL_H
				#include <iostream>
				#include <memory>
				#include <stdint.h>

				/* Try and use std::optional, but failing that assume we'll have a
				* workable https://abseil.io/ install on the include path to get
				* their backport of std::optional. */
				#ifdef __has_include
				#if __has_include(<optional>) && __cplusplus >= 201703L
				#include <optional>
				#define CONTRIB_FUZZ_HAVE_STD_OPTIONAL
				#endif
				#endif
				#ifdef CONTRIB_FUZZ_HAVE_STD_OPTIONAL
				namespace contrib
				{
				using std::nullopt;
				using std::optional;
				} /* namespace contrib */
				#else
				#include "third_party/absl/types/optional.h"
				namespace contrib
				{
				using absl::nullopt;
				using absl::optional;
				} /* namespace contrib */
				#endif

				/* set DEBUG to 1 for a few debugging prints, or 2 for a lot */
				#define DEBUG 0
				#define LOG(level) \
				if (level <= DEBUG) \
				std::cout

				struct two_inputs {
				std::unique_ptr<char[]> right;
				size_t right_size;
				std::unique_ptr<char[]> left;
				size_t left_size;
				};

				/* Split a non-zero-length input into two inputs. */
				contrib::optional<two_inputs> SplitInputs(const uint8_t *Data, size_t Size);

				#endif /* CONTRIB_FUZZ_FUZZUTIL_H */