upstream/mercurial-mirror Files · contrib/fuzz/bdiff.cc

revlog: make sure we never use sparserevlog without general delta (issue6056)...

revlog: make sure we never use sparserevlog without general delta (issue6056) We are getting user report where the delta code tries to use `sparse-revlog` logic on repository where `generaldelta` is disabled. This can't work so we ensure the two booleans have a consistent value. Creating this kind of repository is not expected to be possible the current bug report point at a clonebundle related bug that is still to be properly isolated (Yuya Nishihara seems to a have done it). Corrupting a repository to reproduce the issue is possible. A test using this method is included in this fix.

Augie Fackler - - Load All Authors

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      /*

       * bdiff.cc - fuzzer harness for bdiff.c

       *

       * Copyright 2018, Google Inc.

       *

       * This software may be used and distributed according to the terms of

       * the GNU General Public License, incorporated herein by reference.

       */

      #include <memory>

      #include <stdlib.h>

      #include "fuzzutil.h"

      extern "C" {

      #include "bdiff.h"

      int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size)

      {

      	auto maybe_inputs = SplitInputs(Data, Size);

      	if (!maybe_inputs) {

      		return 0;

      	}

      	auto inputs = std::move(maybe_inputs.value());

      	struct bdiff_line *a, *b;

      	int an = bdiff_splitlines(inputs.left.get(), inputs.left_size, &a);

      	int bn = bdiff_splitlines(inputs.right.get(), inputs.right_size, &b);

      	struct bdiff_hunk l;

      	bdiff_diff(a, an, b, bn, &l);

      	free(a);

      	free(b);

      	bdiff_freehunks(l.next);

      	return 0; // Non-zero return values are reserved for future use.

      }

      #ifdef HG_FUZZER_INCLUDE_MAIN

      int main(int argc, char **argv)

      {

      	const char data[] = "asdf";

      	return LLVMFuzzerTestOneInput((const uint8_t *)data, 4);

      }

      #endif

      } // extern "C"

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				/*
				* bdiff.cc - fuzzer harness for bdiff.c
				*
				* Copyright 2018, Google Inc.
				*
				* This software may be used and distributed according to the terms of
				* the GNU General Public License, incorporated herein by reference.
				*/
				#include <memory>
				#include <stdlib.h>

				#include "fuzzutil.h"

				extern "C" {
				#include "bdiff.h"

				int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size)
				{
				auto maybe_inputs = SplitInputs(Data, Size);
				if (!maybe_inputs) {
				return 0;
				}
				auto inputs = std::move(maybe_inputs.value());

				struct bdiff_line a, b;
				int an = bdiff_splitlines(inputs.left.get(), inputs.left_size, &a);
				int bn = bdiff_splitlines(inputs.right.get(), inputs.right_size, &b);
				struct bdiff_hunk l;
				bdiff_diff(a, an, b, bn, &l);
				free(a);
				free(b);
				bdiff_freehunks(l.next);
				return 0; // Non-zero return values are reserved for future use.
				}

				#ifdef HG_FUZZER_INCLUDE_MAIN
				int main(int argc, char **argv)
				{
				const char data[] = "asdf";
				return LLVMFuzzerTestOneInput((const uint8_t *)data, 4);
				}
				#endif

				} // extern "C"