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Support fuzz testing (#4)

Browse Source 
Quickstart (requires Clang 6 or later):

$ export LIB_FUZZING_ENGINE=/path/to/fuzzing/library.a
$ ./configure --enable-fuzz-testing
$ make
$ cd src/fuzz
$ make fuzz_mdb
$ ./fuzz_mdb

Also add a new `mdb_open_buffer function` to facilitate in-memory
fuzz-testing. This requires fmemopen, which may not be present on all
systems. The internal API has been reworked to use file streams instead
of file descriptors. This allows reading from memory and reading from
files using a consistent API.
This commit is contained in:
Evan Miller
2020-08-31 13:03:58 -04:00
committed by GitHub
parent 8b40423f65
commit be888e0dd7
12 changed files with 194 additions and 89 deletions
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32
configure.ac
View File

@@ -9,6 +9,7 @@ AM_MAINTAINER_MODE([enable])
m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
AC_PROG_CC(gcc)
AC_PROG_CXX
dnl Checks for programs.
AC_PROG_MAKE_SET
m4_pattern_allow([AM_PROG_AR], [AM_PROG_AR])
@@ -25,6 +26,11 @@ AC_CHECK_DECLS([program_invocation_short_name], [], [], [[
#define _GNU_SOURCE
#include <errno.h>]])
dnl Checks for library functions.
VL_LIB_READLINE
AC_CHECK_FUNC(strptime,[ AC_DEFINE(HAVE_STRPTIME, 1, [strptime check]) AM_CONDITIONAL(HAVE_STRPTIME, true) ],[ AM_CONDITIONAL(HAVE_STRPTIME, false) ])
AC_CHECK_FUNC(fmemopen,[ AC_DEFINE(HAVE_FMEMOPEN, 1, [fmemopen check]) ])
dnl Checks for typedefs, structures, and compiler characteristics.
AC_C_CONST
AC_TYPE_SIZE_T
@@ -76,6 +82,27 @@ AS_CASE([$host],
[*mingw*|*cygwin*], [LDFLAGS="$LDFLAGS -no-undefined"], [])
AS_CASE([$host],
[*mingw*], [LDFLAGS="$LDFLAGS -lWs2_32"], [])
dnl Fuzz testing
AC_ARG_ENABLE([fuzz-testing], AS_HELP_STRING([--enable-fuzz-testing], ["Enable fuzz testing (requires Clang 6 or later)"]), [
AC_MSG_CHECKING([whether $CC accepts -fsanitize=fuzzer])
tmp_saved_flags=$[]_AC_LANG_PREFIX[]FLAGS
_AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS -fsanitize=fuzzer"
AC_LINK_IFELSE([AC_LANG_PROGRAM()],
[
AC_MSG_RESULT(yes)
OPTDIRS="$OPTDIRS fuzz"
fuzzer=yes],
AC_MSG_RESULT(no)
AC_MSG_FAILURE([-fsanitize=fuzzer not supported (Required with --enable-fuzz-testing)]))
_AC_LANG_PREFIX[]FLAGS=$tmp_saved_flags
], [fuzzer=no])
AM_CONDITIONAL([FUZZER_ENABLED], test "x$fuzzer" = "xyes")
AC_ARG_VAR([LIB_FUZZING_ENGINE], [Location of prebuilt fuzzing engine library])
AC_SUBST([LIB_FUZZING_ENGINE])
dnl Enable -Wl,--as-needed by default to prevent overlinking
AC_ARG_ENABLE([as-needed],
@@ -269,10 +296,6 @@ AM_CONDITIONAL(ENABLE_MAN, test "$enable_man" = yes)
##################################################
AM_CONDITIONAL(ENABLE_DOCBOOK, test -n "$DOCBOOK_DSL")
dnl Checks for library functions.
VL_LIB_READLINE
AC_CHECK_FUNC(strptime,[ AC_DEFINE(HAVE_STRPTIME, 1, [strptime check]) AM_CONDITIONAL(HAVE_STRPTIME, true) ],[ AM_CONDITIONAL(HAVE_STRPTIME, false) ])
localedir=${datadir}/locale
AC_SUBST(localedir)
@@ -287,6 +310,7 @@ include/Makefile
src/libmdb/Makefile
src/sql/Makefile
src/odbc/Makefile
src/fuzz/Makefile
doc/Makefile
src/gmdb2/Makefile
src/gmdb2/gladefiles/Makefile