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Add asmap_direct fuzzer that tests Interpreter directly

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This commit is contained in:
Pieter Wuille 2020-04-03 18:42:20 -07:00
parent 7cf97fda15
commit 748977690e
2 changed files with 53 additions and 0 deletions
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7
src/Makefile.test.include
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@ -9,6 +9,7 @@ FUZZ_TARGETS = \
test/fuzz/address_deserialize \
test/fuzz/addrman_deserialize \
test/fuzz/asmap \
test/fuzz/asmap_direct \
test/fuzz/banentry_deserialize \
test/fuzz/base_encode_decode \
test/fuzz/bech32 \
@ -322,6 +323,12 @@ test_fuzz_asmap_LDADD = $(FUZZ_SUITE_LD_COMMON)
test_fuzz_asmap_LDFLAGS = $(RELDFLAGS) $(AM_LDFLAGS) $(LIBTOOL_APP_LDFLAGS)
test_fuzz_asmap_SOURCES = test/fuzz/asmap.cpp
test_fuzz_asmap_direct_CPPFLAGS = $(AM_CPPFLAGS) $(BITCOIN_INCLUDES)
test_fuzz_asmap_direct_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS)
test_fuzz_asmap_direct_LDADD = $(FUZZ_SUITE_LD_COMMON)
test_fuzz_asmap_direct_LDFLAGS = $(RELDFLAGS) $(AM_LDFLAGS) $(LIBTOOL_APP_LDFLAGS)
test_fuzz_asmap_direct_SOURCES = test/fuzz/asmap_direct.cpp
test_fuzz_banentry_deserialize_CPPFLAGS = $(AM_CPPFLAGS) $(BITCOIN_INCLUDES) -DBANENTRY_DESERIALIZE=1
test_fuzz_banentry_deserialize_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS)
test_fuzz_banentry_deserialize_LDADD = $(FUZZ_SUITE_LD_COMMON)

46
src/test/fuzz/asmap_direct.cpp Normal file
View file

@ -0,0 +1,46 @@
// Copyright (c) 2020 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <util/asmap.h>
#include <test/fuzz/fuzz.h>
#include <cstdint>
#include <vector>
#include <assert.h>
void test_one_input(const std::vector<uint8_t>& buffer)
{
// Encoding: [asmap using 1 bit / byte] 0xFF [addr using 1 bit / byte]
bool have_sep = false;
size_t sep_pos;
for (size_t pos = 0; pos < buffer.size(); ++pos) {
uint8_t x = buffer[pos];
if ((x & 0xFE) == 0) continue;
if (x == 0xFF) {
if (have_sep) return;
have_sep = true;
sep_pos = pos;
} else {
return;
}
}
if (!have_sep) return; // Needs exactly 1 separator
if (buffer.size() - sep_pos - 1 > 128) return; // At most 128 bits in IP address
// Checks on asmap
std::vector<bool> asmap(buffer.begin(), buffer.begin() + sep_pos);
if (SanityCheckASMap(asmap, buffer.size() - 1 - sep_pos)) {
// Verify that for valid asmaps, no prefix (except up to 7 zero padding bits) is valid.
std::vector<bool> asmap_prefix = asmap;
while (!asmap_prefix.empty() && asmap_prefix.size() + 7 > asmap.size() && asmap_prefix.back() == false) asmap_prefix.pop_back();
while (!asmap_prefix.empty()) {
asmap_prefix.pop_back();
assert(!SanityCheckASMap(asmap_prefix, buffer.size() - 1 - sep_pos));
}
// No address input should trigger assertions in interpreter
std::vector<bool> addr(buffer.begin() + sep_pos + 1, buffer.end());
(void)Interpret(asmap, addr);
}
}