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AFLplusplus/src/afl-cc.c
vanhauser-thc 9bd1e19d7f added AFL_IGNORE_UNKNOWN_ENVS
2021-02-13 22:43:56 +01:00

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/*
american fuzzy lop++ - compiler instrumentation wrapper
-------------------------------------------------------
Written by Michal Zalewski, Laszlo Szekeres and Marc Heuse
Copyright 2015, 2016 Google Inc. All rights reserved.
Copyright 2019-2020 AFLplusplus Project. All rights reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at:
http://www.apache.org/licenses/LICENSE-2.0
*/
#define AFL_MAIN
#include "common.h"
#include "config.h"
#include "types.h"
#include "debug.h"
#include "alloc-inl.h"
#include "llvm-ngram-coverage.h"
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <limits.h>
#include <assert.h>
#if (LLVM_MAJOR - 0 == 0)
#undef LLVM_MAJOR
#endif
#if !defined(LLVM_MAJOR)
#define LLVM_MAJOR 0
#endif
#if (LLVM_MINOR - 0 == 0)
#undef LLVM_MINOR
#endif
#if !defined(LLVM_MINOR)
#define LLVM_MINOR 0
#endif
static u8 * obj_path; /* Path to runtime libraries */
static u8 **cc_params; /* Parameters passed to the real CC */
static u32 cc_par_cnt = 1; /* Param count, including argv0 */
static u8 clang_mode; /* Invoked as afl-clang*? */
static u8 llvm_fullpath[PATH_MAX];
static u8 instrument_mode, instrument_opt_mode, ngram_size, lto_mode;
static u8 compiler_mode, plusplus_mode, have_instr_env = 0;
static u8 have_gcc, have_llvm, have_gcc_plugin, have_lto, have_instr_list = 0;
static u8 * lto_flag = AFL_CLANG_FLTO, *argvnull;
static u8 debug;
static u8 cwd[4096];
static u8 cmplog_mode;
u8 use_stdin; /* dummy */
// static u8 *march_opt = CFLAGS_OPT;
enum {
INSTRUMENT_DEFAULT = 0,
INSTRUMENT_CLASSIC = 1,
INSTRUMENT_AFL = 1,
INSTRUMENT_PCGUARD = 2,
INSTRUMENT_INSTRIM = 3,
INSTRUMENT_CFG = 3,
INSTRUMENT_LTO = 4,
INSTRUMENT_LLVMNATIVE = 5,
INSTRUMENT_GCC = 6,
INSTRUMENT_CLANG = 7,
INSTRUMENT_OPT_CTX = 8,
INSTRUMENT_OPT_NGRAM = 16
};
char instrument_mode_string[18][18] = {
"DEFAULT",
"CLASSIC",
"PCGUARD",
"CFG",
"LTO",
"PCGUARD-NATIVE",
"GCC",
"CLANG",
"CTX",
"",
"",
"",
"",
"",
"",
"",
"NGRAM",
""
};
enum {
UNSET = 0,
LTO = 1,
LLVM = 2,
GCC_PLUGIN = 3,
GCC = 4,
CLANG = 5
};
char compiler_mode_string[7][12] = {
"AUTOSELECT", "LLVM-LTO", "LLVM", "GCC_PLUGIN",
"GCC", "CLANG", ""
};
u8 *getthecwd() {
if (getcwd(cwd, sizeof(cwd)) == NULL) {
static u8 fail[] = "";
return fail;
}
return cwd;
}
/* Try to find a specific runtime we need, returns NULL on fail. */
/*
in find_object() we look here:
1. if obj_path is already set we look there first
2. then we check the $AFL_PATH environment variable location if set
3. next we check argv[0] if it has path information and use it
a) we also check ../lib/afl
4. if 3. failed we check /proc (only Linux, Android, NetBSD, DragonFly, and
FreeBSD with procfs)
a) and check here in ../lib/afl too
5. we look into the AFL_PATH define (usually /usr/local/lib/afl)
6. we finally try the current directory
if all these attempts fail - we return NULL and the caller has to decide
what to do.
*/
static u8 *find_object(u8 *obj, u8 *argv0) {
u8 *afl_path = getenv("AFL_PATH");
u8 *slash = NULL, *tmp;
if (afl_path) {
tmp = alloc_printf("%s/%s", afl_path, obj);
if (debug) DEBUGF("Trying %s\n", tmp);
if (!access(tmp, R_OK)) {
obj_path = afl_path;
return tmp;
}
ck_free(tmp);
}
if (argv0) {
slash = strrchr(argv0, '/');
if (slash) {
u8 *dir = ck_strdup(argv0);
slash = strrchr(dir, '/');
*slash = 0;
tmp = alloc_printf("%s/%s", dir, obj);
if (debug) DEBUGF("Trying %s\n", tmp);
if (!access(tmp, R_OK)) {
obj_path = dir;
return tmp;
}
ck_free(tmp);
tmp = alloc_printf("%s/../lib/afl/%s", dir, obj);
if (debug) DEBUGF("Trying %s\n", tmp);
if (!access(tmp, R_OK)) {
u8 *dir2 = alloc_printf("%s/../lib/afl", dir);
obj_path = dir2;
ck_free(dir);
return tmp;
}
ck_free(tmp);
ck_free(dir);
}
#if defined(__FreeBSD__) || defined(__DragonFly__) || defined(__linux__) || \
defined(__ANDROID__) || defined(__NetBSD__)
#define HAS_PROC_FS 1
#endif
#ifdef HAS_PROC_FS
else {
char *procname = NULL;
#if defined(__FreeBSD__) || defined(__DragonFly__)
procname = "/proc/curproc/file";
#elif defined(__linux__) || defined(__ANDROID__)
procname = "/proc/self/exe";
#elif defined(__NetBSD__)
procname = "/proc/curproc/exe";
#endif
if (procname) {
char exepath[PATH_MAX];
ssize_t exepath_len = readlink(procname, exepath, sizeof(exepath));
if (exepath_len > 0 && exepath_len < PATH_MAX) {
exepath[exepath_len] = 0;
slash = strrchr(exepath, '/');
if (slash) {
*slash = 0;
tmp = alloc_printf("%s/%s", exepath, obj);
if (!access(tmp, R_OK)) {
u8 *dir = alloc_printf("%s", exepath);
obj_path = dir;
return tmp;
}
ck_free(tmp);
tmp = alloc_printf("%s/../lib/afl/%s", exepath, obj);
if (debug) DEBUGF("Trying %s\n", tmp);
if (!access(tmp, R_OK)) {
u8 *dir = alloc_printf("%s/../lib/afl/", exepath);
obj_path = dir;
return tmp;
}
}
}
}
}
#endif
#undef HAS_PROC_FS
}
tmp = alloc_printf("%s/%s", AFL_PATH, obj);
if (debug) DEBUGF("Trying %s\n", tmp);
if (!access(tmp, R_OK)) {
obj_path = AFL_PATH;
return tmp;
}
ck_free(tmp);
tmp = alloc_printf("./%s", obj);
if (debug) DEBUGF("Trying %s\n", tmp);
if (!access(tmp, R_OK)) {
obj_path = ".";
return tmp;
}
ck_free(tmp);
if (debug) DEBUGF("Trying ... giving up\n");
return NULL;
}
/* Copy argv to cc_params, making the necessary edits. */
static void edit_params(u32 argc, char **argv, char **envp) {
u8 fortify_set = 0, asan_set = 0, x_set = 0, bit_mode = 0, shared_linking = 0,
preprocessor_only = 0, have_unroll = 0, have_o = 0, have_pic = 0,
have_c = 0;
cc_params = ck_alloc((argc + 128) * sizeof(u8 *));
if (lto_mode) {
if (lto_flag[0] != '-')
FATAL(
"Using afl-clang-lto is not possible because Makefile magic did not "
"identify the correct -flto flag");
else
compiler_mode = LTO;
}
if (plusplus_mode) {
u8 *alt_cxx = getenv("AFL_CXX");
if (!alt_cxx) {
if (compiler_mode >= GCC_PLUGIN) {
if (compiler_mode == GCC) {
alt_cxx = clang_mode ? "clang++" : "g++";
} else if (compiler_mode == CLANG) {
alt_cxx = "clang++";
} else {
alt_cxx = "g++";
}
} else {
if (USE_BINDIR)
snprintf(llvm_fullpath, sizeof(llvm_fullpath), "%s/clang++",
LLVM_BINDIR);
else
snprintf(llvm_fullpath, sizeof(llvm_fullpath), CLANGPP_BIN);
alt_cxx = llvm_fullpath;
}
}
cc_params[0] = alt_cxx;
} else {
u8 *alt_cc = getenv("AFL_CC");
if (!alt_cc) {
if (compiler_mode >= GCC_PLUGIN) {
if (compiler_mode == GCC) {
alt_cc = clang_mode ? "clang" : "gcc";
} else if (compiler_mode == CLANG) {
alt_cc = "clang";
} else {
alt_cc = "gcc";
}
} else {
if (USE_BINDIR)
snprintf(llvm_fullpath, sizeof(llvm_fullpath), "%s/clang",
LLVM_BINDIR);
else
snprintf(llvm_fullpath, sizeof(llvm_fullpath), CLANGPP_BIN);
alt_cc = llvm_fullpath;
}
}
cc_params[0] = alt_cc;
}
if (compiler_mode == GCC || compiler_mode == CLANG) {
cc_params[cc_par_cnt++] = "-B";
cc_params[cc_par_cnt++] = obj_path;
if (clang_mode || compiler_mode == CLANG) {
cc_params[cc_par_cnt++] = "-no-integrated-as";
}
}
if (compiler_mode == GCC_PLUGIN) {
char *fplugin_arg = alloc_printf("-fplugin=%s/afl-gcc-pass.so", obj_path);
cc_params[cc_par_cnt++] = fplugin_arg;
}
if (compiler_mode == LLVM || compiler_mode == LTO) {
cc_params[cc_par_cnt++] = "-Wno-unused-command-line-argument";
if (lto_mode && plusplus_mode)
cc_params[cc_par_cnt++] = "-lc++"; // needed by fuzzbench, early
if (lto_mode && have_instr_env) {
cc_params[cc_par_cnt++] = "-Xclang";
cc_params[cc_par_cnt++] = "-load";
cc_params[cc_par_cnt++] = "-Xclang";
cc_params[cc_par_cnt++] =
alloc_printf("%s/afl-llvm-lto-instrumentlist.so", obj_path);
}
if (getenv("AFL_LLVM_DICT2FILE")) {
cc_params[cc_par_cnt++] = "-Xclang";
cc_params[cc_par_cnt++] = "-load";
cc_params[cc_par_cnt++] = "-Xclang";
cc_params[cc_par_cnt++] =
alloc_printf("%s/afl-llvm-dict2file.so", obj_path);
}
// laf
if (getenv("LAF_SPLIT_SWITCHES") || getenv("AFL_LLVM_LAF_SPLIT_SWITCHES")) {
if (lto_mode && !have_c) {
cc_params[cc_par_cnt++] = alloc_printf(
"-Wl,-mllvm=-load=%s/split-switches-pass.so", obj_path);
} else {
cc_params[cc_par_cnt++] = "-Xclang";
cc_params[cc_par_cnt++] = "-load";
cc_params[cc_par_cnt++] = "-Xclang";
cc_params[cc_par_cnt++] =
alloc_printf("%s/split-switches-pass.so", obj_path);
}
}
if (getenv("LAF_TRANSFORM_COMPARES") ||
getenv("AFL_LLVM_LAF_TRANSFORM_COMPARES")) {
if (lto_mode && !have_c) {
cc_params[cc_par_cnt++] = alloc_printf(
"-Wl,-mllvm=-load=%s/compare-transform-pass.so", obj_path);
} else {
cc_params[cc_par_cnt++] = "-Xclang";
cc_params[cc_par_cnt++] = "-load";
cc_params[cc_par_cnt++] = "-Xclang";
cc_params[cc_par_cnt++] =
alloc_printf("%s/compare-transform-pass.so", obj_path);
}
}
if (getenv("LAF_SPLIT_COMPARES") || getenv("AFL_LLVM_LAF_SPLIT_COMPARES") ||
getenv("AFL_LLVM_LAF_SPLIT_FLOATS")) {
if (lto_mode && !have_c) {
cc_params[cc_par_cnt++] = alloc_printf(
"-Wl,-mllvm=-load=%s/split-compares-pass.so", obj_path);
} else {
cc_params[cc_par_cnt++] = "-Xclang";
cc_params[cc_par_cnt++] = "-load";
cc_params[cc_par_cnt++] = "-Xclang";
cc_params[cc_par_cnt++] =
alloc_printf("%s/split-compares-pass.so", obj_path);
}
}
// /laf
unsetenv("AFL_LD");
unsetenv("AFL_LD_CALLER");
if (cmplog_mode) {
if (lto_mode && !have_c) {
cc_params[cc_par_cnt++] = alloc_printf(
"-Wl,-mllvm=-load=%s/cmplog-routines-pass.so", obj_path);
cc_params[cc_par_cnt++] = alloc_printf(
"-Wl,-mllvm=-load=%s/cmplog-instructions-pass.so", obj_path);
cc_params[cc_par_cnt++] = alloc_printf(
"-Wl,-mllvm=-load=%s/split-switches-pass.so", obj_path);
} else {
cc_params[cc_par_cnt++] = "-Xclang";
cc_params[cc_par_cnt++] = "-load";
cc_params[cc_par_cnt++] = "-Xclang";
cc_params[cc_par_cnt++] =
alloc_printf("%s/cmplog-routines-pass.so", obj_path);
cc_params[cc_par_cnt++] = "-Xclang";
cc_params[cc_par_cnt++] = "-load";
cc_params[cc_par_cnt++] = "-Xclang";
cc_params[cc_par_cnt++] =
alloc_printf("%s/cmplog-instructions-pass.so", obj_path);
// reuse split switches from laf
cc_params[cc_par_cnt++] = "-Xclang";
cc_params[cc_par_cnt++] = "-load";
cc_params[cc_par_cnt++] = "-Xclang";
cc_params[cc_par_cnt++] =
alloc_printf("%s/split-switches-pass.so", obj_path);
}
cc_params[cc_par_cnt++] = "-fno-inline";
}
#if LLVM_MAJOR >= 13
// fuck you llvm 13
cc_params[cc_par_cnt++] = "-fno-experimental-new-pass-manager";
#endif
if (lto_mode && !have_c) {
u8 *ld_path = strdup(AFL_REAL_LD);
if (!*ld_path) ld_path = "ld.lld";
#if defined(AFL_CLANG_LDPATH) && LLVM_MAJOR >= 12
cc_params[cc_par_cnt++] = alloc_printf("--ld-path=%s", ld_path);
#else
cc_params[cc_par_cnt++] = alloc_printf("-fuse-ld=%s", ld_path);
#endif
cc_params[cc_par_cnt++] = "-Wl,--allow-multiple-definition";
if (instrument_mode == INSTRUMENT_CFG ||
instrument_mode == INSTRUMENT_PCGUARD)
cc_params[cc_par_cnt++] = alloc_printf(
"-Wl,-mllvm=-load=%s/SanitizerCoverageLTO.so", obj_path);
else
cc_params[cc_par_cnt++] = alloc_printf(
"-Wl,-mllvm=-load=%s/afl-llvm-lto-instrumentation.so", obj_path);
cc_params[cc_par_cnt++] = lto_flag;
} else {
if (instrument_mode == INSTRUMENT_PCGUARD) {
#if LLVM_MAJOR > 10 || (LLVM_MAJOR == 10 && LLVM_MINOR > 0)
#ifdef __ANDROID__
cc_params[cc_par_cnt++] = "-fsanitize-coverage=trace-pc-guard";
#else
if (have_instr_list) {
if (!be_quiet)
SAYF(
"Using unoptimized trace-pc-guard, due usage of "
"-fsanitize-coverage-allow/denylist, you can use "
"AFL_LLVM_ALLOWLIST/AFL_LLMV_DENYLIST instead.\n");
cc_params[cc_par_cnt++] = "-fsanitize-coverage=trace-pc-guard";
} else {
cc_params[cc_par_cnt++] = "-Xclang";
cc_params[cc_par_cnt++] = "-load";
cc_params[cc_par_cnt++] = "-Xclang";
cc_params[cc_par_cnt++] =
alloc_printf("%s/SanitizerCoveragePCGUARD.so", obj_path);
}
#endif
#else
#if LLVM_MAJOR >= 4
if (!be_quiet)
SAYF(
"Using unoptimized trace-pc-guard, upgrade to llvm 10.0.1+ for "
"enhanced version.\n");
cc_params[cc_par_cnt++] = "-fsanitize-coverage=trace-pc-guard";
#else
FATAL("pcguard instrumentation requires llvm 4.0.1+");
#endif
#endif
} else if (instrument_mode == INSTRUMENT_LLVMNATIVE) {
#if LLVM_MAJOR >= 4
cc_params[cc_par_cnt++] = "-fsanitize-coverage=trace-pc-guard";
#else
FATAL("pcguard instrumentation requires llvm 4.0.1+");
#endif
} else {
cc_params[cc_par_cnt++] = "-Xclang";
cc_params[cc_par_cnt++] = "-load";
cc_params[cc_par_cnt++] = "-Xclang";
if (instrument_mode == INSTRUMENT_CFG)
cc_params[cc_par_cnt++] =
alloc_printf("%s/libLLVMInsTrim.so", obj_path);
else
cc_params[cc_par_cnt++] =
alloc_printf("%s/afl-llvm-pass.so", obj_path);
}
}
// cc_params[cc_par_cnt++] = "-Qunused-arguments";
// in case LLVM is installed not via a package manager or "make install"
// e.g. compiled download or compiled from github then its ./lib directory
// might not be in the search path. Add it if so.
u8 *libdir = strdup(LLVM_LIBDIR);
if (plusplus_mode && strlen(libdir) && strncmp(libdir, "/usr", 4) &&
strncmp(libdir, "/lib", 4)) {
cc_params[cc_par_cnt++] = "-rpath";
cc_params[cc_par_cnt++] = libdir;
} else {
free(libdir);
}
if (lto_mode && argc > 1) {
u32 idx;
for (idx = 1; idx < argc; idx++) {
if (!strncasecmp(argv[idx], "-fpic", 5)) have_pic = 1;
}
if (!have_pic) cc_params[cc_par_cnt++] = "-fPIC";
}
}
/* Detect stray -v calls from ./configure scripts. */
while (--argc) {
u8 *cur = *(++argv);
if (!strncmp(cur, "--afl", 5)) continue;
if (lto_mode && !strncmp(cur, "-fuse-ld=", 9)) continue;
if (lto_mode && !strncmp(cur, "--ld-path=", 10)) continue;
if (!strncmp(cur, "-fno-unroll", 11)) continue;
if (strstr(cur, "afl-compiler-rt") || strstr(cur, "afl-llvm-rt")) continue;
if (!strcmp(cur, "-Wl,-z,defs") || !strcmp(cur, "-Wl,--no-undefined"))
continue;
if (!strncmp(cur, "-fsanitize=fuzzer-", strlen("-fsanitize=fuzzer-")) ||
!strncmp(cur, "-fsanitize-coverage", strlen("-fsanitize-coverage"))) {
if (!be_quiet) { WARNF("Found '%s' - stripping!", cur); }
continue;
}
if (!strcmp(cur, "-fsanitize=fuzzer")) {
u8 *afllib = find_object("libAFLDriver.a", argv[0]);
if (!be_quiet)
WARNF(
"Found erroneous '-fsanitize=fuzzer', trying to replace with "
"libAFLDriver.a");
if (!afllib) {
WARNF(
"Cannot find 'libAFLDriver.a' to replace a wrong "
"'-fsanitize=fuzzer' in the flags - this will fail!");
} else {
cc_params[cc_par_cnt++] = afllib;
}
continue;
}
if (!strcmp(cur, "-m32")) bit_mode = 32;
if (!strcmp(cur, "armv7a-linux-androideabi")) bit_mode = 32;
if (!strcmp(cur, "-m64")) bit_mode = 64;
if (!strncmp(cur, "-fsanitize-coverage-", 20) && strstr(cur, "list="))
have_instr_list = 1;
if (!strcmp(cur, "-fsanitize=address") || !strcmp(cur, "-fsanitize=memory"))
asan_set = 1;
if (strstr(cur, "FORTIFY_SOURCE")) fortify_set = 1;
if (!strcmp(cur, "-x")) x_set = 1;
if (!strcmp(cur, "-E")) preprocessor_only = 1;
if (!strcmp(cur, "-shared")) shared_linking = 1;
if (!strcmp(cur, "-c")) have_c = 1;
if (!strncmp(cur, "-O", 2)) have_o = 1;
if (!strncmp(cur, "-funroll-loop", 13)) have_unroll = 1;
cc_params[cc_par_cnt++] = cur;
}
if (getenv("AFL_HARDEN")) {
cc_params[cc_par_cnt++] = "-fstack-protector-all";
if (!fortify_set) cc_params[cc_par_cnt++] = "-D_FORTIFY_SOURCE=2";
}
if (!asan_set) {
if (getenv("AFL_USE_ASAN")) {
if (getenv("AFL_USE_MSAN")) FATAL("ASAN and MSAN are mutually exclusive");
if (getenv("AFL_HARDEN"))
FATAL("ASAN and AFL_HARDEN are mutually exclusive");
cc_params[cc_par_cnt++] = "-U_FORTIFY_SOURCE";
cc_params[cc_par_cnt++] = "-fsanitize=address";
} else if (getenv("AFL_USE_MSAN")) {
if (getenv("AFL_USE_ASAN")) FATAL("ASAN and MSAN are mutually exclusive");
if (getenv("AFL_HARDEN"))
FATAL("MSAN and AFL_HARDEN are mutually exclusive");
cc_params[cc_par_cnt++] = "-U_FORTIFY_SOURCE";
cc_params[cc_par_cnt++] = "-fsanitize=memory";
}
}
if (getenv("AFL_USE_UBSAN")) {
cc_params[cc_par_cnt++] = "-fsanitize=undefined";
cc_params[cc_par_cnt++] = "-fsanitize-undefined-trap-on-error";
cc_params[cc_par_cnt++] = "-fno-sanitize-recover=all";
}
if (getenv("AFL_USE_CFISAN")) {
if (!lto_mode) {
uint32_t i = 0, found = 0;
while (envp[i] != NULL && !found)
if (strncmp("-flto", envp[i++], 5) == 0) found = 1;
if (!found) cc_params[cc_par_cnt++] = "-flto";
}
cc_params[cc_par_cnt++] = "-fsanitize=cfi";
cc_params[cc_par_cnt++] = "-fvisibility=hidden";
}
if (!getenv("AFL_DONT_OPTIMIZE")) {
cc_params[cc_par_cnt++] = "-g";
if (!have_o) cc_params[cc_par_cnt++] = "-O3";
if (!have_unroll) cc_params[cc_par_cnt++] = "-funroll-loops";
// if (strlen(march_opt) > 1 && march_opt[0] == '-')
// cc_params[cc_par_cnt++] = march_opt;
}
if (getenv("AFL_NO_BUILTIN") || getenv("AFL_LLVM_LAF_TRANSFORM_COMPARES") ||
getenv("LAF_TRANSFORM_COMPARES") || getenv("AFL_LLVM_LAF_ALL") ||
lto_mode) {
cc_params[cc_par_cnt++] = "-fno-builtin-strcmp";
cc_params[cc_par_cnt++] = "-fno-builtin-strncmp";
cc_params[cc_par_cnt++] = "-fno-builtin-strcasecmp";
cc_params[cc_par_cnt++] = "-fno-builtin-strncasecmp";
cc_params[cc_par_cnt++] = "-fno-builtin-memcmp";
cc_params[cc_par_cnt++] = "-fno-builtin-bcmp";
cc_params[cc_par_cnt++] = "-fno-builtin-strstr";
cc_params[cc_par_cnt++] = "-fno-builtin-strcasestr";
}
#if defined(USEMMAP) && !defined(__HAIKU__)
if (!have_c) cc_params[cc_par_cnt++] = "-lrt";
#endif
cc_params[cc_par_cnt++] = "-D__AFL_HAVE_MANUAL_CONTROL=1";
cc_params[cc_par_cnt++] = "-D__AFL_COMPILER=1";
cc_params[cc_par_cnt++] = "-DFUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION=1";
/* When the user tries to use persistent or deferred forkserver modes by
appending a single line to the program, we want to reliably inject a
signature into the binary (to be picked up by afl-fuzz) and we want
to call a function from the runtime .o file. This is unnecessarily
painful for three reasons:
1) We need to convince the compiler not to optimize out the signature.
This is done with __attribute__((used)).
2) We need to convince the linker, when called with -Wl,--gc-sections,
not to do the same. This is done by forcing an assignment to a
'volatile' pointer.
3) We need to declare __afl_persistent_loop() in the global namespace,
but doing this within a method in a class is hard - :: and extern "C"
are forbidden and __attribute__((alias(...))) doesn't work. Hence the
__asm__ aliasing trick.
*/
cc_params[cc_par_cnt++] =
"-D__AFL_FUZZ_INIT()="
"int __afl_sharedmem_fuzzing = 1;"
"extern unsigned int *__afl_fuzz_len;"
"extern unsigned char *__afl_fuzz_ptr;"
"unsigned char __afl_fuzz_alt[1048576];"
"unsigned char *__afl_fuzz_alt_ptr = __afl_fuzz_alt;";
if (plusplus_mode) {
cc_params[cc_par_cnt++] =
"-D__AFL_COVERAGE()=int __afl_selective_coverage = 1;"
"extern \"C\" void __afl_coverage_discard();"
"extern \"C\" void __afl_coverage_skip();"
"extern \"C\" void __afl_coverage_on();"
"extern \"C\" void __afl_coverage_off();";
} else {
cc_params[cc_par_cnt++] =
"-D__AFL_COVERAGE()=int __afl_selective_coverage = 1;"
"void __afl_coverage_discard();"
"void __afl_coverage_skip();"
"void __afl_coverage_on();"
"void __afl_coverage_off();";
}
cc_params[cc_par_cnt++] =
"-D__AFL_COVERAGE_START_OFF()=int __afl_selective_coverage_start_off = "
"1;";
cc_params[cc_par_cnt++] = "-D__AFL_COVERAGE_ON()=__afl_coverage_on()";
cc_params[cc_par_cnt++] = "-D__AFL_COVERAGE_OFF()=__afl_coverage_off()";
cc_params[cc_par_cnt++] =
"-D__AFL_COVERAGE_DISCARD()=__afl_coverage_discard()";
cc_params[cc_par_cnt++] = "-D__AFL_COVERAGE_SKIP()=__afl_coverage_skip()";
cc_params[cc_par_cnt++] =
"-D__AFL_FUZZ_TESTCASE_BUF=(__afl_fuzz_ptr ? __afl_fuzz_ptr : "
"__afl_fuzz_alt_ptr)";
cc_params[cc_par_cnt++] =
"-D__AFL_FUZZ_TESTCASE_LEN=(__afl_fuzz_ptr ? *__afl_fuzz_len : "
"(*__afl_fuzz_len = read(0, __afl_fuzz_alt_ptr, 1048576)) == 0xffffffff "
"? 0 : *__afl_fuzz_len)";
cc_params[cc_par_cnt++] =
"-D__AFL_LOOP(_A)="
"({ static volatile char *_B __attribute__((used)); "
" _B = (char*)\"" PERSIST_SIG
"\"; "
#ifdef __APPLE__
"__attribute__((visibility(\"default\"))) "
"int _L(unsigned int) __asm__(\"___afl_persistent_loop\"); "
#else
"__attribute__((visibility(\"default\"))) "
"int _L(unsigned int) __asm__(\"__afl_persistent_loop\"); "
#endif /* ^__APPLE__ */
"_L(_A); })";
cc_params[cc_par_cnt++] =
"-D__AFL_INIT()="
"do { static volatile char *_A __attribute__((used)); "
" _A = (char*)\"" DEFER_SIG
"\"; "
#ifdef __APPLE__
"__attribute__((visibility(\"default\"))) "
"void _I(void) __asm__(\"___afl_manual_init\"); "
#else
"__attribute__((visibility(\"default\"))) "
"void _I(void) __asm__(\"__afl_manual_init\"); "
#endif /* ^__APPLE__ */
"_I(); } while (0)";
if (x_set) {
cc_params[cc_par_cnt++] = "-x";
cc_params[cc_par_cnt++] = "none";
}
if (preprocessor_only) {
/* In the preprocessor_only case (-E), we are not actually compiling at
all but requesting the compiler to output preprocessed sources only.
We must not add the runtime in this case because the compiler will
simply output its binary content back on stdout, breaking any build
systems that rely on a separate source preprocessing step. */
cc_params[cc_par_cnt] = NULL;
return;
}
#ifndef __ANDROID__
if (compiler_mode != GCC && compiler_mode != CLANG) {
switch (bit_mode) {
case 0:
cc_params[cc_par_cnt++] =
alloc_printf("%s/afl-compiler-rt.o", obj_path);
if (lto_mode)
cc_params[cc_par_cnt++] =
alloc_printf("%s/afl-llvm-rt-lto.o", obj_path);
break;
case 32:
cc_params[cc_par_cnt++] =
alloc_printf("%s/afl-compiler-rt-32.o", obj_path);
if (access(cc_params[cc_par_cnt - 1], R_OK))
FATAL("-m32 is not supported by your compiler");
if (lto_mode) {
cc_params[cc_par_cnt++] =
alloc_printf("%s/afl-llvm-rt-lto-32.o", obj_path);
if (access(cc_params[cc_par_cnt - 1], R_OK))
FATAL("-m32 is not supported by your compiler");
}
break;
case 64:
cc_params[cc_par_cnt++] =
alloc_printf("%s/afl-compiler-rt-64.o", obj_path);
if (access(cc_params[cc_par_cnt - 1], R_OK))
FATAL("-m64 is not supported by your compiler");
if (lto_mode) {
cc_params[cc_par_cnt++] =
alloc_printf("%s/afl-llvm-rt-lto-64.o", obj_path);
if (access(cc_params[cc_par_cnt - 1], R_OK))
FATAL("-m64 is not supported by your compiler");
}
break;
}
#if !defined(__APPLE__) && !defined(__sun)
if (!shared_linking && !have_c)
cc_params[cc_par_cnt++] =
alloc_printf("-Wl,--dynamic-list=%s/dynamic_list.txt", obj_path);
#endif
#if defined(USEMMAP) && !defined(__HAIKU__)
if (!have_c) cc_params[cc_par_cnt++] = "-lrt";
#endif
// prevent unnecessary build errors
cc_params[cc_par_cnt++] = "-Wno-unused-command-line-argument";
}
#endif
cc_params[cc_par_cnt] = NULL;
}
/* Main entry point */
int main(int argc, char **argv, char **envp) {
int i;
char *callname = argv[0], *ptr = NULL;
if (getenv("AFL_DEBUG")) {
debug = 1;
if (strcmp(getenv("AFL_DEBUG"), "0") == 0) unsetenv("AFL_DEBUG");
} else if (getenv("AFL_QUIET"))
be_quiet = 1;
if (getenv("AFL_LLVM_INSTRUMENT_FILE") || getenv("AFL_LLVM_WHITELIST") ||
getenv("AFL_LLVM_ALLOWLIST") || getenv("AFL_LLVM_DENYLIST") ||
getenv("AFL_LLVM_BLOCKLIST")) {
have_instr_env = 1;
}
if ((ptr = strrchr(callname, '/')) != NULL) callname = ptr + 1;
argvnull = (u8 *)argv[0];
check_environment_vars(envp);
if ((ptr = find_object("as", argv[0])) != NULL) {
have_gcc = 1;
ck_free(ptr);
}
#if (LLVM_MAJOR > 2)
if ((ptr = find_object("SanitizerCoverageLTO.so", argv[0])) != NULL) {
have_lto = 1;
ck_free(ptr);
}
if ((ptr = find_object("cmplog-routines-pass.so", argv[0])) != NULL) {
have_llvm = 1;
ck_free(ptr);
}
#endif
#ifdef __ANDROID__
have_llvm = 1;
#endif
if ((ptr = find_object("afl-gcc-pass.so", argv[0])) != NULL) {
have_gcc_plugin = 1;
ck_free(ptr);
}
#if (LLVM_MAJOR > 2)
if (strncmp(callname, "afl-clang-fast", 14) == 0) {
compiler_mode = LLVM;
} else if (strncmp(callname, "afl-clang-lto", 13) == 0 ||
strncmp(callname, "afl-lto", 7) == 0) {
compiler_mode = LTO;
} else
#endif
if (strncmp(callname, "afl-gcc-fast", 12) == 0 ||
strncmp(callname, "afl-g++-fast", 12) == 0) {
compiler_mode = GCC_PLUGIN;
} else if (strncmp(callname, "afl-gcc", 7) == 0 ||
strncmp(callname, "afl-g++", 7) == 0) {
compiler_mode = GCC;
} else if (strcmp(callname, "afl-clang") == 0 ||
strcmp(callname, "afl-clang++") == 0) {
compiler_mode = CLANG;
}
if ((ptr = getenv("AFL_CC_COMPILER"))) {
if (compiler_mode) {
WARNF(
"\"AFL_CC_COMPILER\" is set but a specific compiler was already "
"selected by command line parameter or symlink, ignoring the "
"environment variable!");
} else {
if (strncasecmp(ptr, "LTO", 3) == 0) {
compiler_mode = LTO;
} else if (strncasecmp(ptr, "LLVM", 4) == 0) {
compiler_mode = LLVM;
} else if (strncasecmp(ptr, "GCC_P", 5) == 0 ||
strncasecmp(ptr, "GCC-P", 5) == 0 ||
strncasecmp(ptr, "GCCP", 4) == 0) {
compiler_mode = GCC_PLUGIN;
} else if (strcasecmp(ptr, "GCC") == 0) {
compiler_mode = GCC;
} else
FATAL("Unknown AFL_CC_COMPILER mode: %s\n", ptr);
}
}
if (strcmp(callname, "afl-clang") == 0 ||
strcmp(callname, "afl-clang++") == 0) {
clang_mode = 1;
compiler_mode = CLANG;
if (strcmp(callname, "afl-clang++") == 0) { plusplus_mode = 1; }
}
for (i = 1; i < argc; i++) {
if (strncmp(argv[i], "--afl", 5) == 0) {
if (compiler_mode)
WARNF(
"--afl-... compiler mode supersedes the AFL_CC_COMPILER and "
"symlink compiler selection!");
ptr = argv[i];
ptr += 5;
while (*ptr == '-')
ptr++;
if (strncasecmp(ptr, "LTO", 3) == 0) {
compiler_mode = LTO;
} else if (strncasecmp(ptr, "LLVM", 4) == 0) {
compiler_mode = LLVM;
} else if (strncasecmp(ptr, "PCGUARD", 7) == 0 ||
strncasecmp(ptr, "PC-GUARD", 8) == 0) {
compiler_mode = LLVM;
instrument_mode = INSTRUMENT_PCGUARD;
} else if (strcasecmp(ptr, "INSTRIM") == 0 ||
strcasecmp(ptr, "CFG") == 0) {
compiler_mode = LLVM;
instrument_mode = INSTRUMENT_CFG;
} else if (strcasecmp(ptr, "AFL") == 0 ||
strcasecmp(ptr, "CLASSIC") == 0) {
compiler_mode = LLVM;
instrument_mode = INSTRUMENT_CLASSIC;
} else if (strcasecmp(ptr, "LLVMNATIVE") == 0 ||
strcasecmp(ptr, "LLVM-NATIVE") == 0) {
compiler_mode = LLVM;
instrument_mode = INSTRUMENT_LLVMNATIVE;
} else if (strncasecmp(ptr, "GCC_P", 5) == 0 ||
strncasecmp(ptr, "GCC-P", 5) == 0 ||
strncasecmp(ptr, "GCCP", 4) == 0) {
compiler_mode = GCC_PLUGIN;
} else if (strcasecmp(ptr, "GCC") == 0) {
compiler_mode = GCC;
} else if (strncasecmp(ptr, "CLANG", 5) == 0) {
compiler_mode = CLANG;
} else
FATAL("Unknown --afl-... compiler mode: %s\n", argv[i]);
}
}
if (strlen(callname) > 2 &&
(strncmp(callname + strlen(callname) - 2, "++", 2) == 0 ||
strstr(callname, "-g++") != NULL))
plusplus_mode = 1;
if (getenv("USE_TRACE_PC") || getenv("AFL_USE_TRACE_PC") ||
getenv("AFL_LLVM_USE_TRACE_PC") || getenv("AFL_TRACE_PC")) {
if (instrument_mode == 0)
instrument_mode = INSTRUMENT_PCGUARD;
else if (instrument_mode != INSTRUMENT_PCGUARD)
FATAL("you cannot set AFL_LLVM_INSTRUMENT and AFL_TRACE_PC together");
}
if (have_instr_env && getenv("AFL_DONT_OPTIMIZE")) {
WARNF(
"AFL_LLVM_ALLOWLIST/DENYLIST and AFL_DONT_OPTIMIZE cannot be combined "
"for file matching, only function matching!");
}
if (getenv("AFL_LLVM_INSTRIM") || getenv("INSTRIM") ||
getenv("INSTRIM_LIB")) {
if (instrument_mode == 0)
instrument_mode = INSTRUMENT_CFG;
else if (instrument_mode != INSTRUMENT_CFG)
FATAL("you cannot set AFL_LLVM_INSTRUMENT and AFL_LLVM_INSTRIM together");
}
if (getenv("AFL_LLVM_CTX")) instrument_opt_mode |= INSTRUMENT_OPT_CTX;
if (getenv("AFL_LLVM_NGRAM_SIZE")) {
instrument_opt_mode |= INSTRUMENT_OPT_NGRAM;
ngram_size = atoi(getenv("AFL_LLVM_NGRAM_SIZE"));
if (ngram_size < 2 || ngram_size > NGRAM_SIZE_MAX)
FATAL(
"NGRAM instrumentation mode must be between 2 and NGRAM_SIZE_MAX "
"(%u)",
NGRAM_SIZE_MAX);
}
if (getenv("AFL_LLVM_INSTRUMENT")) {
u8 *ptr2 = strtok(getenv("AFL_LLVM_INSTRUMENT"), ":,;");
while (ptr2) {
if (strncasecmp(ptr2, "afl", strlen("afl")) == 0 ||
strncasecmp(ptr2, "classic", strlen("classic")) == 0) {
if (instrument_mode == INSTRUMENT_LTO) {
instrument_mode = INSTRUMENT_CLASSIC;
lto_mode = 1;
} else if (!instrument_mode || instrument_mode == INSTRUMENT_AFL)
instrument_mode = INSTRUMENT_AFL;
else
FATAL("main instrumentation mode already set with %s",
instrument_mode_string[instrument_mode]);
}
if (strncasecmp(ptr2, "pc-guard", strlen("pc-guard")) == 0 ||
strncasecmp(ptr2, "pcguard", strlen("pcguard")) == 0) {
if (!instrument_mode || instrument_mode == INSTRUMENT_PCGUARD)
instrument_mode = INSTRUMENT_PCGUARD;
else
FATAL("main instrumentation mode already set with %s",
instrument_mode_string[instrument_mode]);
}
if (strncasecmp(ptr2, "llvmnative", strlen("llvmnative")) == 0 ||
strncasecmp(ptr2, "llvm-native", strlen("llvm-native")) == 0) {
if (!instrument_mode || instrument_mode == INSTRUMENT_LLVMNATIVE)
instrument_mode = INSTRUMENT_LLVMNATIVE;
else
FATAL("main instrumentation mode already set with %s",
instrument_mode_string[instrument_mode]);
}
if (strncasecmp(ptr2, "cfg", strlen("cfg")) == 0 ||
strncasecmp(ptr2, "instrim", strlen("instrim")) == 0) {
if (instrument_mode == INSTRUMENT_LTO) {
instrument_mode = INSTRUMENT_CFG;
lto_mode = 1;
} else if (!instrument_mode || instrument_mode == INSTRUMENT_CFG)
instrument_mode = INSTRUMENT_CFG;
else
FATAL("main instrumentation mode already set with %s",
instrument_mode_string[instrument_mode]);
}
if (strncasecmp(ptr2, "lto", strlen("lto")) == 0) {
lto_mode = 1;
if (!instrument_mode || instrument_mode == INSTRUMENT_LTO)
instrument_mode = INSTRUMENT_LTO;
else if (instrument_mode != INSTRUMENT_CFG)
FATAL("main instrumentation mode already set with %s",
instrument_mode_string[instrument_mode]);
}
if (strcasecmp(ptr2, "gcc") == 0) {
if (!instrument_mode || instrument_mode == INSTRUMENT_GCC)
instrument_mode = INSTRUMENT_GCC;
else if (instrument_mode != INSTRUMENT_GCC)
FATAL("main instrumentation mode already set with %s",
instrument_mode_string[instrument_mode]);
compiler_mode = GCC;
}
if (strcasecmp(ptr2, "clang") == 0) {
if (!instrument_mode || instrument_mode == INSTRUMENT_CLANG)
instrument_mode = INSTRUMENT_CLANG;
else if (instrument_mode != INSTRUMENT_CLANG)
FATAL("main instrumentation mode already set with %s",
instrument_mode_string[instrument_mode]);
compiler_mode = CLANG;
}
if (strncasecmp(ptr2, "ctx", strlen("ctx")) == 0) {
instrument_opt_mode |= INSTRUMENT_OPT_CTX;
setenv("AFL_LLVM_CTX", "1", 1);
}
if (strncasecmp(ptr2, "ngram", strlen("ngram")) == 0) {
u8 *ptr3 = ptr2 + strlen("ngram");
while (*ptr3 && (*ptr3 < '0' || *ptr3 > '9'))
ptr3++;
if (!*ptr3) {
if ((ptr3 = getenv("AFL_LLVM_NGRAM_SIZE")) == NULL)
FATAL(
"you must set the NGRAM size with (e.g. for value 2) "
"AFL_LLVM_INSTRUMENT=ngram-2");
}
ngram_size = atoi(ptr3);
if (ngram_size < 2 || ngram_size > NGRAM_SIZE_MAX)
FATAL(
"NGRAM instrumentation option must be between 2 and "
"NGRAM_SIZE_MAX (%u)",
NGRAM_SIZE_MAX);
instrument_opt_mode |= (INSTRUMENT_OPT_NGRAM);
u8 *ptr4 = alloc_printf("%u", ngram_size);
setenv("AFL_LLVM_NGRAM_SIZE", ptr4, 1);
}
ptr2 = strtok(NULL, ":,;");
}
}
if (!compiler_mode) {
// lto is not a default because outside of afl-cc RANLIB and AR have to
// be set to llvm versions so this would work
if (have_llvm)
compiler_mode = LLVM;
else if (have_gcc_plugin)
compiler_mode = GCC_PLUGIN;
else if (have_gcc)
compiler_mode = GCC;
else if (have_lto)
compiler_mode = LTO;
else
FATAL("no compiler mode available");
}
if (compiler_mode == GCC) {
if (clang_mode) {
instrument_mode = INSTRUMENT_CLANG;
} else {
instrument_mode = INSTRUMENT_GCC;
}
}
if (compiler_mode == CLANG) { instrument_mode = INSTRUMENT_CLANG; }
if (argc < 2 || strncmp(argv[1], "-h", 2) == 0) {
printf("afl-cc" VERSION
" by Michal Zalewski, Laszlo Szekeres, Marc Heuse\n");
SAYF(
"\n"
"afl-cc/afl-c++ [options]\n"
"\n"
"This is a helper application for afl-fuzz. It serves as a drop-in "
"replacement\n"
"for gcc and clang, letting you recompile third-party code with the "
"required\n"
"runtime instrumentation. A common use pattern would be one of the "
"following:\n\n"
" CC=afl-cc CXX=afl-c++ ./configure --disable-shared\n"
" cmake -DCMAKE_C_COMPILERC=afl-cc -DCMAKE_CXX_COMPILER=afl-c++ .\n"
" CC=afl-cc CXX=afl-c++ meson\n\n");
SAYF(
" |------------- FEATURES "
"-------------|\n"
"MODES: NCC PERSIST DICT LAF "
"CMPLOG SELECT\n"
" [LTO] llvm LTO: %s%s\n"
" PCGUARD DEFAULT yes yes yes yes yes "
" yes\n"
" CLASSIC yes yes yes yes yes "
" yes\n"
" [LLVM] llvm: %s%s\n"
" PCGUARD %s yes yes module yes yes "
"extern\n"
" CLASSIC %s no yes module yes yes "
"yes\n"
" - NORMAL\n"
" - CTX\n"
" - NGRAM-{2-16}\n"
" INSTRIM no yes module yes yes "
" yes\n"
" - NORMAL\n"
" - CTX\n"
" - NGRAM-{2-16}\n"
" [GCC_PLUGIN] gcc plugin: %s%s\n"
" CLASSIC DEFAULT no yes no no no "
"yes\n"
" [GCC/CLANG] simple gcc/clang: %s%s\n"
" CLASSIC DEFAULT no no no no no "
"no\n\n",
have_lto ? "AVAILABLE" : "unavailable!",
compiler_mode == LTO ? " [SELECTED]" : "",
have_llvm ? "AVAILABLE" : "unavailable!",
compiler_mode == LLVM ? " [SELECTED]" : "",
LLVM_MAJOR > 6 ? "DEFAULT" : " ",
LLVM_MAJOR > 6 ? " " : "DEFAULT",
have_gcc_plugin ? "AVAILABLE" : "unavailable!",
compiler_mode == GCC_PLUGIN ? " [SELECTED]" : "",
have_gcc ? "AVAILABLE" : "unavailable!",
(compiler_mode == GCC || compiler_mode == CLANG) ? " [SELECTED]" : "");
SAYF(
"Modes:\n"
" To select the compiler mode use a symlink version (e.g. "
"afl-clang-fast), set\n"
" the environment variable AFL_CC_COMPILER to a mode (e.g. LLVM) or "
"use the\n"
" command line parameter --afl-MODE (e.g. --afl-llvm). If none is "
"selected,\n"
" afl-cc will select the best available (LLVM -> GCC_PLUGIN -> GCC).\n"
" The best is LTO but it often needs RANLIB and AR settings outside "
"of afl-cc.\n\n");
#if LLVM_MAJOR > 10 || (LLVM_MAJOR == 10 && LLVM_MINOR > 0)
#define NATIVE_MSG \
" NATIVE: use llvm's native PCGUARD instrumentation (less " \
"performant)\n"
#else
#define NATIVE_MSG ""
#endif
SAYF(
"Sub-Modes: (set via env AFL_LLVM_INSTRUMENT, afl-cc selects the best "
"available)\n"
" PCGUARD: Dominator tree instrumentation (best!) (README.llvm.md)\n"
NATIVE_MSG
" CLASSIC: decision target instrumentation (README.llvm.md)\n"
" CTX: CLASSIC + callee context (instrumentation/README.ctx.md)\n"
" NGRAM-x: CLASSIC + previous path "
"((instrumentation/README.ngram.md)\n"
" INSTRIM: Dominator tree (for LLVM <= 6.0) "
"(instrumentation/README.instrim.md)\n\n");
#undef NATIVE_MSG
SAYF(
"Features: (see documentation links)\n"
" NCC: non-colliding coverage [automatic] (that is an amazing "
"thing!)\n"
" (instrumentation/README.lto.md)\n"
" PERSIST: persistent mode support [code] (huge speed increase!)\n"
" (instrumentation/README.persistent_mode.md)\n"
" DICT: dictionary in the target [yes=automatic or llvm module "
"pass]\n"
" (instrumentation/README.lto.md + "
"instrumentation/README.llvm.md)\n"
" LAF: comparison splitting [env] "
"(instrumentation/README.laf-intel.md)\n"
" CMPLOG: input2state exploration [env] "
"(instrumentation/README.cmplog.md)\n"
" SELECT: selective instrumentation (allow/deny) on filename or "
"function [env]\n"
" (instrumentation/README.instrument_list.md)\n\n");
if (argc < 2 || strncmp(argv[1], "-hh", 3)) {
SAYF(
"To see all environment variables for the configuration of afl-cc "
"use \"-hh\".\n");
} else {
SAYF(
"Environment variables used:\n"
" AFL_CC: path to the C compiler to use\n"
" AFL_CXX: path to the C++ compiler to use\n"
" AFL_DEBUG: enable developer debugging output\n"
" AFL_DONT_OPTIMIZE: disable optimization instead of -O3\n"
" AFL_NO_BUILTIN: no builtins for string compare functions (for "
"libtokencap.so)\n"
" AFL_PATH: path to instrumenting pass and runtime "
"(afl-compiler-rt.*o)\n"
" AFL_IGNORE_UNKNOWN_ENVS: don't warn on unknown env vars\n"
" AFL_INST_RATIO: percentage of branches to instrument\n"
" AFL_QUIET: suppress verbose output\n"
" AFL_HARDEN: adds code hardening to catch memory bugs\n"
" AFL_USE_ASAN: activate address sanitizer\n"
" AFL_USE_CFISAN: activate control flow sanitizer\n"
" AFL_USE_MSAN: activate memory sanitizer\n"
" AFL_USE_UBSAN: activate undefined behaviour sanitizer\n");
if (have_gcc_plugin)
SAYF(
"\nGCC Plugin-specific environment variables:\n"
" AFL_GCC_OUT_OF_LINE: disable inlined instrumentation\n"
" AFL_GCC_SKIP_NEVERZERO: do not skip zero on trace counters\n"
" AFL_GCC_INSTRUMENT_FILE: enable selective instrumentation by "
"filename\n");
#if LLVM_MAJOR < 9
#define COUNTER_BEHAVIOUR \
" AFL_LLVM_NOT_ZERO: use cycling trace counters that skip zero\n"
#else
#define COUNTER_BEHAVIOUR \
" AFL_LLVM_SKIP_NEVERZERO: do not skip zero on trace counters\n"
#endif
if (have_llvm)
SAYF(
"\nLLVM/LTO/afl-clang-fast/afl-clang-lto specific environment "
"variables:\n"
COUNTER_BEHAVIOUR
" AFL_LLVM_DICT2FILE: generate an afl dictionary based on found "
"comparisons\n"
" AFL_LLVM_LAF_ALL: enables all LAF splits/transforms\n"
" AFL_LLVM_LAF_SPLIT_COMPARES: enable cascaded comparisons\n"
" AFL_LLVM_LAF_SPLIT_COMPARES_BITW: size limit (default 8)\n"
" AFL_LLVM_LAF_SPLIT_SWITCHES: cascaded comparisons on switches\n"
" AFL_LLVM_LAF_SPLIT_FLOATS: cascaded comparisons on floats\n"
" AFL_LLVM_LAF_TRANSFORM_COMPARES: cascade comparisons for string "
"functions\n"
" AFL_LLVM_ALLOWLIST/AFL_LLVM_DENYLIST: enable "
"instrument allow/\n"
" deny listing (selective instrumentation)\n");
if (have_llvm)
SAYF(
" AFL_LLVM_CMPLOG: log operands of comparisons (RedQueen "
"mutator)\n"
" AFL_LLVM_INSTRUMENT: set instrumentation mode:\n"
" CLASSIC, INSTRIM, PCGUARD, LTO, GCC, CLANG, CTX, NGRAM-2 ... "
"NGRAM-16\n"
" You can also use the old environment variables instead:\n"
" AFL_LLVM_USE_TRACE_PC: use LLVM trace-pc-guard instrumentation\n"
" AFL_LLVM_INSTRIM: use light weight instrumentation InsTrim\n"
" AFL_LLVM_INSTRIM_LOOPHEAD: optimize loop tracing for speed "
"(option to INSTRIM)\n"
" AFL_LLVM_CTX: use context sensitive coverage (for CLASSIC and "
"INSTRIM)\n"
" AFL_LLVM_NGRAM_SIZE: use ngram prev_loc count coverage (for "
"CLASSIC & INSTRIM)\n");
#ifdef AFL_CLANG_FLTO
if (have_lto)
SAYF(
"\nLTO/afl-clang-lto specific environment variables:\n"
" AFL_LLVM_MAP_ADDR: use a fixed coverage map address (speed), "
"e.g. "
"0x10000\n"
" AFL_LLVM_DOCUMENT_IDS: write all edge IDs and the corresponding "
"functions\n"
" into this file\n"
" AFL_LLVM_LTO_DONTWRITEID: don't write the highest ID used to a "
"global var\n"
" AFL_LLVM_LTO_STARTID: from which ID to start counting from for "
"a "
"bb\n"
" AFL_REAL_LD: use this lld linker instead of the compiled in "
"path\n"
"If anything fails - be sure to read README.lto.md!\n");
#endif
}
SAYF(
"\nFor any information on the available instrumentations and options "
"please \n"
"consult the README.md, especially section 3.1 about instrumenting "
"targets.\n\n");
#if (LLVM_MAJOR > 2)
if (have_lto)
SAYF("afl-cc LTO with ld=%s %s\n", AFL_REAL_LD, AFL_CLANG_FLTO);
if (have_llvm)
SAYF("afl-cc LLVM version %d using the binary path \"%s\".\n", LLVM_MAJOR,
LLVM_BINDIR);
#endif
#ifdef USEMMAP
#if !defined(__HAIKU__)
SAYF("Compiled with shm_open support.\n");
#else
SAYF("Compiled with shm_open support (adds -lrt when linking).\n");
#endif
#else
SAYF("Compiled with shmat support.\n");
#endif
SAYF("\n");
SAYF(
"Do not be overwhelmed :) afl-cc uses good defaults if no options are "
"selected.\n"
"Read the documentation for FEATURES though, all are good but few are "
"defaults.\n\n");
exit(1);
}
if (compiler_mode == LTO) {
if (instrument_mode == 0 || instrument_mode == INSTRUMENT_LTO ||
instrument_mode == INSTRUMENT_CFG ||
instrument_mode == INSTRUMENT_PCGUARD) {
lto_mode = 1;
// force CFG
// if (!instrument_mode) {
instrument_mode = INSTRUMENT_PCGUARD;
// ptr = instrument_mode_string[instrument_mode];
// }
} else if (instrument_mode == INSTRUMENT_LTO ||
instrument_mode == INSTRUMENT_CLASSIC) {
lto_mode = 1;
} else {
if (!be_quiet)
WARNF("afl-clang-lto called with mode %s, using that mode instead",
instrument_mode_string[instrument_mode]);
}
}
if (instrument_mode == 0 && compiler_mode < GCC_PLUGIN) {
#if LLVM_MAJOR <= 6
instrument_mode = INSTRUMENT_AFL;
#else
#if LLVM_MAJOR < 11 && (LLVM_MAJOR < 10 || LLVM_MINOR < 1)
if (have_instr_env) {
instrument_mode = INSTRUMENT_AFL;
if (!be_quiet)
WARNF(
"Switching to classic instrumentation because "
"AFL_LLVM_ALLOWLIST/DENYLIST does not work with PCGUARD < 10.0.1.");
} else
#endif
instrument_mode = INSTRUMENT_PCGUARD;
#endif
}
if (instrument_opt_mode && compiler_mode != LLVM)
FATAL("CTX and NGRAM can only be used in LLVM mode");
if (!instrument_opt_mode) {
if (lto_mode && instrument_mode == INSTRUMENT_CFG)
instrument_mode = INSTRUMENT_PCGUARD;
ptr = instrument_mode_string[instrument_mode];
} else {
if (instrument_opt_mode == INSTRUMENT_OPT_CTX)
ptr = alloc_printf("%s + CTX", instrument_mode_string[instrument_mode]);
else if (instrument_opt_mode == INSTRUMENT_OPT_NGRAM)
ptr = alloc_printf("%s + NGRAM-%u",
instrument_mode_string[instrument_mode], ngram_size);
else
ptr = alloc_printf("%s + CTX + NGRAM-%u",
instrument_mode_string[instrument_mode], ngram_size);
}
#ifndef AFL_CLANG_FLTO
if (lto_mode)
FATAL(
"instrumentation mode LTO specified but LLVM support not available "
"(requires LLVM 11 or higher)");
#endif
if (instrument_opt_mode && instrument_mode != INSTRUMENT_CLASSIC &&
instrument_mode != INSTRUMENT_CFG)
FATAL(
"CTX and NGRAM instrumentation options can only be used with CFG "
"(recommended) and CLASSIC instrumentation modes!");
if (getenv("AFL_LLVM_SKIP_NEVERZERO") && getenv("AFL_LLVM_NOT_ZERO"))
FATAL(
"AFL_LLVM_NOT_ZERO and AFL_LLVM_SKIP_NEVERZERO can not be set "
"together");
#if LLVM_MAJOR < 11 && (LLVM_MAJOR < 10 || LLVM_MINOR < 1)
if (instrument_mode == INSTRUMENT_PCGUARD && have_instr_env) {
FATAL(
"Instrumentation type PCGUARD does not support "
"AFL_LLVM_ALLOWLIST/DENYLIST! Use LLVM 10.0.1+ instead.");
}
#endif
u8 *ptr2;
if ((ptr2 = getenv("AFL_LLVM_DICT2FILE")) != NULL && *ptr2 != '/')
FATAL("AFL_LLVM_DICT2FILE must be set to an absolute file path");
if ((isatty(2) && !be_quiet) || debug) {
SAYF(cCYA
"afl-cc " VERSION cRST
" by Michal Zalewski, Laszlo Szekeres, Marc Heuse - mode: %s-%s\n",
compiler_mode_string[compiler_mode], ptr);
}
if (!be_quiet && (compiler_mode == GCC || compiler_mode == CLANG)) {
WARNF(
"You are using outdated instrumentation, install LLVM and/or "
"gcc-plugin and use afl-clang-fast/afl-clang-lto/afl-gcc-fast "
"instead!");
}
if (debug) {
DEBUGF("cd '%s';", getthecwd());
for (i = 0; i < argc; i++)
SAYF(" '%s'", argv[i]);
SAYF("\n");
fflush(stdout);
fflush(stderr);
}
if (getenv("AFL_LLVM_LAF_ALL")) {
setenv("AFL_LLVM_LAF_SPLIT_SWITCHES", "1", 1);
setenv("AFL_LLVM_LAF_SPLIT_COMPARES", "1", 1);
setenv("AFL_LLVM_LAF_SPLIT_FLOATS", "1", 1);
setenv("AFL_LLVM_LAF_TRANSFORM_COMPARES", "1", 1);
}
cmplog_mode = getenv("AFL_CMPLOG") || getenv("AFL_LLVM_CMPLOG");
if (!be_quiet && cmplog_mode)
printf("CmpLog mode by <andreafioraldi@gmail.com>\n");
#ifndef __ANDROID__
ptr = find_object("afl-compiler-rt.o", argv[0]);
if (!ptr) {
FATAL(
"Unable to find 'afl-compiler-rt.o'. Please set the AFL_PATH "
"environment variable.");
}
if (debug) { DEBUGF("rt=%s obj_path=%s\n", ptr, obj_path); }
ck_free(ptr);
#endif
edit_params(argc, argv, envp);
if (debug) {
DEBUGF("cd '%s';", getthecwd());
for (i = 0; i < (s32)cc_par_cnt; i++)
SAYF(" '%s'", cc_params[i]);
SAYF("\n");
fflush(stdout);
fflush(stderr);
}
execvp(cc_params[0], (char **)cc_params);
FATAL("Oops, failed to execute '%s' - check your PATH", cc_params[0]);
return 0;
}
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