diff options
Diffstat (limited to 'src/afl-gcc.c')
| -rw-r--r-- | src/afl-gcc.c | 488 |
1 files changed, 0 insertions, 488 deletions
diff --git a/src/afl-gcc.c b/src/afl-gcc.c deleted file mode 100644 index 97564aea..00000000 --- a/src/afl-gcc.c +++ /dev/null @@ -1,488 +0,0 @@ -/* - american fuzzy lop++ - wrapper for GCC and clang - ------------------------------------------------ - - Originally written by Michal Zalewski - - Now maintained by Marc Heuse <mh@mh-sec.de>, - Heiko Eißfeldt <heiko.eissfeldt@hexco.de> and - Andrea Fioraldi <andreafioraldi@gmail.com> - - Copyright 2016, 2017 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 - - This program is a drop-in replacement for GCC or clang. The most common way - of using it is to pass the path to afl-gcc or afl-clang via CC when invoking - ./configure. - - (Of course, use CXX and point it to afl-g++ / afl-clang++ for C++ code.) - - The wrapper needs to know the path to afl-as (renamed to 'as'). The default - is /usr/local/lib/afl/. A convenient way to specify alternative directories - would be to set AFL_PATH. - - If AFL_HARDEN is set, the wrapper will compile the target app with various - hardening options that may help detect memory management issues more - reliably. You can also specify AFL_USE_ASAN to enable ASAN. - - If you want to call a non-default compiler as a next step of the chain, - specify its location via AFL_CC or AFL_CXX. - - */ - -#define AFL_MAIN - -#include "config.h" -#include "types.h" -#include "debug.h" -#include "alloc-inl.h" - -#include <stdio.h> -#include <unistd.h> -#include <stdlib.h> -#include <string.h> - -static u8 * as_path; /* Path to the AFL 'as' wrapper */ -static u8 **cc_params; /* Parameters passed to the real CC */ -static u32 cc_par_cnt = 1; /* Param count, including argv0 */ -static u8 be_quiet, /* Quiet mode */ - clang_mode; /* Invoked as afl-clang*? */ - -/* Try to find our "fake" GNU assembler in AFL_PATH or at the location derived - from argv[0]. If that fails, abort. */ - -static void find_as(u8 *argv0) { - - u8 *afl_path = getenv("AFL_PATH"); - u8 *slash, *tmp; - - if (afl_path) { - - tmp = alloc_printf("%s/as", afl_path); - - if (!access(tmp, X_OK)) { - - as_path = afl_path; - ck_free(tmp); - return; - - } - - ck_free(tmp); - - } - - slash = strrchr(argv0, '/'); - - if (slash) { - - u8 *dir; - - *slash = 0; - dir = ck_strdup(argv0); - *slash = '/'; - - tmp = alloc_printf("%s/afl-as", dir); - - if (!access(tmp, X_OK)) { - - as_path = dir; - ck_free(tmp); - return; - - } - - ck_free(tmp); - ck_free(dir); - - } - - if (!access(AFL_PATH "/as", X_OK)) { - - as_path = AFL_PATH; - return; - - } - - FATAL("Unable to find AFL wrapper binary for 'as'. Please set AFL_PATH"); - -} - -/* Copy argv to cc_params, making the necessary edits. */ - -static void edit_params(u32 argc, char **argv) { - - u8 fortify_set = 0, asan_set = 0; - u8 *name; - -#if defined(__FreeBSD__) && defined(WORD_SIZE_64) - u8 m32_set = 0; -#endif - - cc_params = ck_alloc((argc + 128) * sizeof(u8 *)); - - name = strrchr(argv[0], '/'); - if (!name) { - - name = argv[0]; - - /* This should never happen but fixes a scan-build warning */ - if (!name) { FATAL("Empty argv set"); } - - } else { - - ++name; - - } - - if (!strncmp(name, "afl-clang", 9)) { - - clang_mode = 1; - - setenv(CLANG_ENV_VAR, "1", 1); - - if (!strcmp(name, "afl-clang++")) { - - u8 *alt_cxx = getenv("AFL_CXX"); - cc_params[0] = alt_cxx && *alt_cxx ? alt_cxx : (u8 *)"clang++"; - - } else if (!strcmp(name, "afl-clang")) { - - u8 *alt_cc = getenv("AFL_CC"); - cc_params[0] = alt_cc && *alt_cc ? alt_cc : (u8 *)"clang"; - - } else { - - fprintf(stderr, "Name of the binary: %s\n", argv[0]); - FATAL("Name of the binary is not a known name, expected afl-clang(++)"); - - } - - } else { - - /* With GCJ and Eclipse installed, you can actually compile Java! The - instrumentation will work (amazingly). Alas, unhandled exceptions do - not call abort(), so afl-fuzz would need to be modified to equate - non-zero exit codes with crash conditions when working with Java - binaries. Meh. */ - -#ifdef __APPLE__ - - if (!strcmp(name, "afl-g++")) { - - cc_params[0] = getenv("AFL_CXX"); - - } else if (!strcmp(name, "afl-gcj")) { - - cc_params[0] = getenv("AFL_GCJ"); - - } else if (!strcmp(name, "afl-gcc")) { - - cc_params[0] = getenv("AFL_CC"); - - } else { - - fprintf(stderr, "Name of the binary: %s\n", argv[0]); - FATAL("Name of the binary is not a known name, expected afl-gcc/g++/gcj"); - - } - - if (!cc_params[0]) { - - SAYF("\n" cLRD "[-] " cRST - "On Apple systems, 'gcc' is usually just a wrapper for clang. " - "Please use the\n" - " 'afl-clang' utility instead of 'afl-gcc'. If you really have " - "GCC installed,\n" - " set AFL_CC or AFL_CXX to specify the correct path to that " - "compiler.\n"); - - FATAL("AFL_CC or AFL_CXX required on MacOS X"); - - } - -#else - - if (!strcmp(name, "afl-g++")) { - - u8 *alt_cxx = getenv("AFL_CXX"); - cc_params[0] = alt_cxx && *alt_cxx ? alt_cxx : (u8 *)"g++"; - - } else if (!strcmp(name, "afl-gcj")) { - - u8 *alt_cc = getenv("AFL_GCJ"); - cc_params[0] = alt_cc && *alt_cc ? alt_cc : (u8 *)"gcj"; - - } else if (!strcmp(name, "afl-gcc")) { - - u8 *alt_cc = getenv("AFL_CC"); - cc_params[0] = alt_cc && *alt_cc ? alt_cc : (u8 *)"gcc"; - - } else { - - fprintf(stderr, "Name of the binary: %s\n", argv[0]); - FATAL("Name of the binary is not a known name, expected afl-gcc/g++/gcj"); - - } - -#endif /* __APPLE__ */ - - } - - while (--argc) { - - u8 *cur = *(++argv); - - if (!strncmp(cur, "-B", 2)) { - - if (!be_quiet) { WARNF("-B is already set, overriding"); } - - if (!cur[2] && argc > 1) { - - argc--; - argv++; - - } - - continue; - - } - - if (!strcmp(cur, "-integrated-as")) { continue; } - - if (!strcmp(cur, "-pipe")) { continue; } - -#if defined(__FreeBSD__) && defined(WORD_SIZE_64) - if (!strcmp(cur, "-m32")) m32_set = 1; -#endif - - if (!strcmp(cur, "-fsanitize=address") || - !strcmp(cur, "-fsanitize=memory")) { - - asan_set = 1; - - } - - if (strstr(cur, "FORTIFY_SOURCE")) { fortify_set = 1; } - - cc_params[cc_par_cnt++] = cur; - - } - - cc_params[cc_par_cnt++] = "-B"; - cc_params[cc_par_cnt++] = as_path; - - if (clang_mode) { cc_params[cc_par_cnt++] = "-no-integrated-as"; } - - 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) { - - /* Pass this on to afl-as to adjust map density. */ - - setenv("AFL_USE_ASAN", "1", 1); - - } else 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 defined(USEMMAP) && !defined(__HAIKU__) - cc_params[cc_par_cnt++] = "-lrt"; -#endif - - if (!getenv("AFL_DONT_OPTIMIZE")) { - -#if defined(__FreeBSD__) && defined(WORD_SIZE_64) - - /* On 64-bit FreeBSD systems, clang -g -m32 is broken, but -m32 itself - works OK. This has nothing to do with us, but let's avoid triggering - that bug. */ - - if (!clang_mode || !m32_set) cc_params[cc_par_cnt++] = "-g"; - -#else - - cc_params[cc_par_cnt++] = "-g"; - -#endif - - cc_params[cc_par_cnt++] = "-O3"; - cc_params[cc_par_cnt++] = "-funroll-loops"; - - /* Two indicators that you're building for fuzzing; one of them is - AFL-specific, the other is shared with libfuzzer. */ - - cc_params[cc_par_cnt++] = "-D__AFL_COMPILER=1"; - cc_params[cc_par_cnt++] = "-DFUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION=1"; - - } - - if (getenv("AFL_NO_BUILTIN")) { - - 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"; - - } - - cc_params[cc_par_cnt] = NULL; - -} - -/* Main entry point */ - -int main(int argc, char **argv) { - - char *env_info = - "Environment variables used by afl-gcc:\n" - "AFL_CC: path to the C compiler to use\n" - "AFL_CXX: path to the C++ compiler to use\n" - "AFL_GCJ: path to the java compiler to use\n" - "AFL_PATH: path to the instrumenting assembler\n" - "AFL_DONT_OPTIMIZE: disable optimization instead of -O3\n" - "AFL_NO_BUILTIN: compile for use with libtokencap.so\n" - "AFL_QUIET: suppress verbose output\n" - "AFL_CAL_FAST: speed up the initial calibration\n" - "AFL_HARDEN: adds code hardening to catch memory bugs\n" - "AFL_USE_ASAN: activate address sanitizer\n" - "AFL_USE_MSAN: activate memory sanitizer\n" - "AFL_USE_UBSAN: activate undefined behaviour sanitizer\n" - - "\nEnvironment variables used by afl-as (called by afl-gcc):\n" - "AFL_AS: path to the assembler to use\n" - "TMPDIR: set the directory for temporary files of afl-as\n" - "TEMP: fall back path to directory for temporary files\n" - "TMP: fall back path to directory for temporary files\n" - "AFL_INST_RATIO: percentage of branches to instrument\n" - "AFL_QUIET: suppress verbose output\n" - "AFL_KEEP_ASSEMBLY: leave instrumented assembly files\n" - "AFL_AS_FORCE_INSTRUMENT: force instrumentation for asm sources\n"; - - if (argc == 2 && strncmp(argv[1], "-h", 2) == 0) { - - printf("afl-cc" VERSION " by Michal Zalewski\n\n"); - printf("%s \n\n", argv[0]); - printf("afl-gcc has no command line options\n\n%s\n", env_info); - printf( - "NOTE: afl-gcc is deprecated, llvm_mode is much faster and has more " - "options\n"); - return -1; - - } - - if ((isatty(2) && !getenv("AFL_QUIET")) || getenv("AFL_DEBUG") != NULL) { - - SAYF(cCYA "afl-cc" VERSION cRST " by Michal Zalewski\n"); - SAYF(cYEL "[!] " cBRI "NOTE: " cRST - "afl-gcc is deprecated, llvm_mode is much faster and has more " - "options\n"); - - } else { - - be_quiet = 1; - - } - - if (argc < 2) { - - SAYF( - "\n" - "This is a helper application for afl-fuzz. It serves as a drop-in " - "replacement\n" - "for gcc or 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=%s/afl-gcc ./configure\n" - " CXX=%s/afl-g++ ./configure\n\n%s" - - , - BIN_PATH, BIN_PATH, env_info); - - exit(1); - - } - - u8 *ptr; - if (!be_quiet && - ((ptr = getenv("AFL_MAP_SIZE")) || (ptr = getenv("AFL_MAPSIZE")))) { - - u32 map_size = atoi(ptr); - if (map_size != MAP_SIZE) { - - WARNF("AFL_MAP_SIZE is not supported by afl-gcc"); - - } - - } - - find_as(argv[0]); - - edit_params(argc, argv); - - execvp(cc_params[0], (char **)cc_params); - - FATAL("Oops, failed to execute '%s' - check your PATH", cc_params[0]); - - return 0; - -} - |