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build: introduce a fuzzing mode

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This adds a new configuration, --enable-fuzzing (which is more than
welcome to be coupled with --enable-address-sanitizer), to pass the
fuzzer sanitizer argument when compiling objects. This allows libfuzzer
to actually be able "to fuzz" by detecting coverage and be smart when
mutating inputs.

As libfuzzer brings its own ~~fees~~ main(), we compile objects with
fsanitize=fuzzer-no-link, and special-case the linkage of the fuzz
targets.

A "lib" is added to abstract out the interface to the fuzzing tool used.
This allow us to use the same targets to fuzz using AFL, hongfuzz or w/e
by adding their entrypoints into libfuzz. (h/t to practicalswift who
introduced this for bitcoin-core, which i mimiced)

Signed-off-by: Antoine Poinsot <darosior@protonmail.com>
This commit is contained in:
Antoine Poinsot
2020-09-07 17:32:19 +02:00
committed by Christian Decker
parent ede5f5be3c
commit 62b54d0125
6 changed files with 127 additions and 6 deletions
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17
configure vendored
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@@ -120,6 +120,7 @@ set_defaults()
CONFIGURATOR_CC=${CONFIGURATOR_CC-$CC}
VALGRIND=${VALGRIND:-$(default_valgrind_setting)}
TEST_NETWORK=${TEST_NETWORK:-regtest}
FUZZING=${FUZZING:-0}
}
usage()
@@ -155,6 +156,7 @@ usage()
echo " Static link sqlite3, gmp and zlib libraries"
usage_with_default "--enable/disable-address-sanitizer" "$ASAN" "enable" "disable"
echo " Compile with address-sanitizer"
usage_with_default "--enable/disable-fuzzing" "$FUZZING" "enable" "disable"
exit 1
}
@@ -206,6 +208,8 @@ for opt in "$@"; do
--disable-static) STATIC=0;;
--enable-address-sanitizer) ASAN=1;;
--disable-address-sanitizer) ASAN=0;;
--enable-fuzzing) FUZZING=1;;
--disable-fuzzing) FUZZING=0;;
--help|-h) usage;;
*)
echo "Unknown option '$opt'" >&2
@@ -229,6 +233,18 @@ if [ "$ASAN" = "1" ]; then
fi
fi
if [ "$FUZZING" = "1" ]; then
case "$CC" in
(*"clang"*)
;;
(*)
echo "Fuzzing is currently only supported with clang."
exit 1
;;
esac
fi
SQLITE3_CFLAGS=""
SQLITE3_LDLIBS="-lsqlite3"
if command -v "${PKG_CONFIG}" >/dev/null; then
@@ -400,6 +416,7 @@ add_var ASAN "$ASAN"
add_var TEST_NETWORK "$TEST_NETWORK"
add_var HAVE_PYTHON3_MAKO "$HAVE_PYTHON3_MAKO"
add_var SHA256SUM "$SHA256SUM"
add_var FUZZING "$FUZZING"
# Hack to avoid sha256 name clash with libwally: will be fixed when that
# becomes a standalone shared lib.