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make: build dependencies with fuzzing flags

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By using fuzzer instrumentation for dependencies, we get more coverage
signal during fuzzing. This is useful when the fuzzer must figure out
how to take certain branches in a dependency.

In our case, the fuzz-bip32 target was failing to create a data buffer
that successfully passed fromwire_ext_key() parsing because the fuzzer
couldn't see what was happening inside libwally-core.
This commit is contained in:
Matt Morehouse 2023-05-16 10:48:18 -05:00 • committed by Christian Decker
parent dff2dd259e
commit eed73082f5
2 changed files with 7 additions and 4 deletions
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5
configure vendored
View file

@ -148,6 +148,7 @@ set_defaults()
ASAN=${ASAN:-0}
UBSAN=${UBSAN:-0}
FUZZING=${FUZZING:-0}
FUZZFLAGS=""
CSANFLAGS=""
if [ "$ASAN" != 0 ]; then
CSANFLAGS="$CSANFLAGS -fsanitize=address"
@ -162,7 +163,8 @@ set_defaults()
fi
fi
if [ "$FUZZING" != 0 ]; then
CSANFLAGS="$CSANFLAGS -fsanitize=fuzzer-no-link"
FUZZFLAGS="-fsanitize=fuzzer-no-link"
CSANFLAGS="$CSANFLAGS $FUZZFLAGS"
fi
echo CSANFLAGS = $CSANFLAGS
PYTEST=${PYTEST-$(default_pytest)}
@ -473,6 +475,7 @@ add_var CWARNFLAGS "$CWARNFLAGS"
add_var CDEBUGFLAGS "$CDEBUGFLAGS"
add_var COPTFLAGS "$COPTFLAGS"
add_var CSANFLAGS "$CSANFLAGS"
add_var FUZZFLAGS "$FUZZFLAGS"
add_var SQLITE3_CFLAGS "$SQLITE3_CFLAGS"
add_var SQLITE3_LDLIBS "$SQLITE3_LDLIBS"
add_var POSTGRES_INCLUDE "$POSTGRES_INCLUDE"

6
external/Makefile vendored
View file

@ -71,7 +71,7 @@ $(TARGET_DIR)/libsodium.a: $(TARGET_DIR)/libsodium-build/src/libsodium/libsodium
$(TARGET_DIR)/libsodium-build/src/libsodium/libsodium.la: external/libsodium/src/libsodium/include/sodium.h
cd external/libsodium && ./autogen.sh
mkdir -p ${TARGET_DIR}/libsodium-build
cd $(TARGET_DIR)/libsodium-build && $(TOP)/libsodium/configure CC="$(CC)" --enable-static=yes $(CROSSCOMPILE_OPTS) --enable-shared=no --prefix=/ --libdir=/ && $(MAKE)
cd $(TARGET_DIR)/libsodium-build && $(TOP)/libsodium/configure CC="$(CC)" CFLAGS="$(FUZZFLAGS)" LDFLAGS="$(FUZZFLAGS)" --enable-static=yes $(CROSSCOMPILE_OPTS) --enable-shared=no --prefix=/ --libdir=/ && $(MAKE)
# libsecp included in libwally.
# Wildcards here are magic. See http://stackoverflow.com/questions/2973445/gnu-makefile-rule-generating-a-few-targets-from-a-single-source-file
@ -83,7 +83,7 @@ $(TARGET_DIR)/libwally-core-build/src/libwallycore.% $(TARGET_DIR)/libwally-core
cd external/libwally-core && ./tools/autogen.sh
mkdir -p ${TARGET_DIR}/libwally-core-build
cd ${TARGET_DIR}/libwally-core-build \
&& PYTHON_VERSION=3 CFLAGS=-std=c99 ${TOP}/libwally-core/configure CC="$(CC)" \
&& PYTHON_VERSION=3 CFLAGS="-std=c99 $(FUZZFLAGS)" LDFLAGS="$(FUZZFLAGS)" ${TOP}/libwally-core/configure CC="$(CC)" \
--enable-static=yes \
$(CROSSCOMPILE_OPTS) \
--enable-module-recovery \
@ -115,7 +115,7 @@ $(TARGET_DIR)/libbacktrace.a: external/libbacktrace/backtrace.h
$(MAKE) -C $(TARGET_DIR)/libbacktrace-build DESTDIR=$$(pwd)/$(TARGET_DIR) install-exec
$(TARGET_DIR)/lowdown-build/bin/lowdown: external/lowdown/lowdown.h
cd external/lowdown && CC="$(CC)" ./configure PREFIX=`pwd`/$(TOP)/$(TARGET_DIR)/lowdown-build/
cd external/lowdown && CC="$(CC)" CFLAGS="$(FUZZFLAGS)" ./configure LDFLAGS="$(FUZZFLAGS)" PREFIX=`pwd`/$(TOP)/$(TARGET_DIR)/lowdown-build/
$(MAKE) -C external/lowdown install
distclean: external-distclean