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dongloong 1 month ago
parent ff4848b344
commit 59f47a5e69
2 changed files with 2482 additions and 2502 deletions
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afl-fuzz.c
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afl-gcc.c
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@ -14,6 +14,8 @@
limitations under the License. limitations under the License.
*/ */
// 这部分是版权声明和许可证信息，说明这个文件是在Apache License 2.0下发布的。
/* /*
american fuzzy lop - wrapper for GCC and clang american fuzzy lop - wrapper for GCC and clang
---------------------------------------------- ----------------------------------------------
@ -38,7 +40,7 @@
specify its location via AFL_CC or AFL_CXX. specify its location via AFL_CC or AFL_CXX.
*/ */
// 这部分是注释，提供了关于这个程序的概述和使用说明。
#define AFL_MAIN #define AFL_MAIN
#include "config.h" #include "config.h"
@ -51,6 +53,8 @@
#include <stdlib.h> #include <stdlib.h>
#include <string.h> #include <string.h>
// 这些是包含的头文件，其中一些是AFL自己的头文件，其他的是C标准库的头文件
static u8* as_path; /* Path to the AFL 'as' wrapper */ static u8* as_path; /* Path to the AFL 'as' wrapper */
static u8** cc_params; /* Parameters passed to the real CC */ static u8** cc_params; /* Parameters passed to the real CC */
static u32 cc_par_cnt = 1; /* Param count, including argv0 */ static u32 cc_par_cnt = 1; /* Param count, including argv0 */
@ -58,11 +62,14 @@ static u8 be_quiet, /* Quiet mode */
clang_mode; /* Invoked as afl-clang*? */ clang_mode; /* Invoked as afl-clang*? */
// 这些是全局变量声明。`as_path`存储AFL汇编器的路径，`cc_params`存储传递给实际编译器的参数，`cc_par_cnt`是参数计数器，`be_quiet`用于控制
// 是否静默模式，`clang_mode`指示是否以`afl-clang`或`afl-clang++`模式调用。
/* Try to find our "fake" GNU assembler in AFL_PATH or at the location derived /* Try to find our "fake" GNU assembler in AFL_PATH or at the location derived
from argv[0]. If that fails, abort. */ from argv[0]. If that fails, abort. */
static void find_as(u8* argv0) { static void find_as(u8* argv0) {
// 这个函数尝试在AFL_PATH环境变量指定的路径或从argv[0]派生的路径中找到AFL的“假”GNU汇编器。如果找不到，程序将终止。
u8 *afl_path = getenv("AFL_PATH"); u8 *afl_path = getenv("AFL_PATH");
u8 *slash, *tmp; u8 *slash, *tmp;
@ -116,31 +123,32 @@ static void find_as(u8* argv0) {
/* Copy argv to cc_params, making the necessary edits. */ /* Copy argv to cc_params, making the necessary edits. */
static void edit_params(u32 argc, char** argv) { static void edit_params(u32 argc, char** argv) {
//定义了一个函数edit_params，它接受两个参数：argc是参数的数量，argv是参数的数组。
u8 fortify_set = 0, asan_set = 0; u8 fortify_set = 0, asan_set = 0;//声明两个变量fortify_set和asan_set，用于跟踪是否已经设置了FORTIFY_SOURCE和address sanitizer（ASan）标志
u8 *name; u8 *name;//用于存储程序的名称
#if defined(__FreeBSD__) && defined(__x86_64__) #if defined(__FreeBSD__) && defined(__x86_64__)
u8 m32_set = 0; u8 m32_set = 0;
#endif #endif
cc_params = ck_alloc((argc + 128) * sizeof(u8*)); cc_params = ck_alloc((argc + 128) * sizeof(u8*));//分配内存以存储修改后的参数列表，大小为argc + 128个u8*类型的指针。
name = strrchr(argv[0], '/'); name = strrchr(argv[0], '/');//找到argv[0]（程序的路径）中最后一个'/'字符，这通常用于获取程序的名称。
if (!name) name = argv[0]; else name++; if (!name) name = argv[0]; else name++;//如果name为NULL（即argv[0]中没有'/'），则name指向argv[0]的开始。否则，name向前移动一个字符，跳过'/'。
if (!strncmp(name, "afl-clang", 9)) { if (!strncmp(name, "afl-clang", 9)) {
clang_mode = 1; clang_mode = 1;//检查程序名称是否以"afl-clang"开头，如果是，设置clang_mode标志为1
setenv(CLANG_ENV_VAR, "1", 1); setenv(CLANG_ENV_VAR, "1", 1);//设置环境变量CLANG_ENV_VAR为"1"，这可能用于通知其他部分的AFL工具链正在使用Clang。
if (!strcmp(name, "afl-clang++")) { if (!strcmp(name, "afl-clang++")) {
u8* alt_cxx = getenv("AFL_CXX"); u8* alt_cxx = getenv("AFL_CXX");
cc_params[0] = alt_cxx ? alt_cxx : (u8*)"clang++"; cc_params[0] = alt_cxx ? alt_cxx : (u8*)"clang++";//如果AFL_CXX设置，将其值作为第一个参数；否则，使用"clang++"。
} else { } else {
u8* alt_cc = getenv("AFL_CC"); u8* alt_cc = getenv("AFL_CC");
cc_params[0] = alt_cc ? alt_cc : (u8*)"clang"; cc_params[0] = alt_cc ? alt_cc : (u8*)"clang";//否则尝试获取环境变量AFL_CC的值。
} }
} else { } else {
@ -152,13 +160,13 @@ static void edit_params(u32 argc, char** argv) {
binaries. Meh. */ binaries. Meh. */
#ifdef __APPLE__ #ifdef __APPLE__
//在Apple系统上，根据程序名称设置不同的编译器。如果AFL_CXX、AFL_GCJ或AFL_CC环境变量设置，使用它们的值；否则，使用默认的编译器名称
if (!strcmp(name, "afl-g++")) cc_params[0] = getenv("AFL_CXX"); 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-gcj")) cc_params[0] = getenv("AFL_GCJ");
else cc_params[0] = getenv("AFL_CC"); else cc_params[0] = getenv("AFL_CC");
if (!cc_params[0]) { if (!cc_params[0]) {
//输出错误信息，指出在MacOS X上需要设置AFL_CC或AFL_CXX环境变量。
SAYF("\n" cLRD "[-] " cRST SAYF("\n" cLRD "[-] " cRST
"On Apple systems, 'gcc' is usually just a wrapper for clang. Please use the\n" "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" " 'afl-clang' utility instead of 'afl-gcc'. If you really have GCC installed,\n"
@ -169,7 +177,7 @@ static void edit_params(u32 argc, char** argv) {
} }
#else #else
//对于非Apple系统，根据程序名称设置不同的编译器。如果相应的环境变量设置，使用它们的值；否则，使用默认的编译器名称。
if (!strcmp(name, "afl-g++")) { if (!strcmp(name, "afl-g++")) {
u8* alt_cxx = getenv("AFL_CXX"); u8* alt_cxx = getenv("AFL_CXX");
cc_params[0] = alt_cxx ? alt_cxx : (u8*)"g++"; cc_params[0] = alt_cxx ? alt_cxx : (u8*)"g++";
@ -188,27 +196,27 @@ static void edit_params(u32 argc, char** argv) {
while (--argc) { while (--argc) {
u8* cur = *(++argv); u8* cur = *(++argv);
if (!strncmp(cur, "-B", 2)) { if (!strncmp(cur, "-B", 2)) {//如果当前参数以"-B"开头，输出警告信息，并跳过后续参数（如果当前参数后面紧跟着的是编译器的路径）。
if (!be_quiet) WARNF("-B is already set, overriding"); if (!be_quiet) WARNF("-B is already set, overriding");//如果程序不在静默模式，输出警告信息。
if (!cur[2] && argc > 1) { argc--; argv++; } if (!cur[2] && argc > 1) { argc--; argv++; }//如果-B后面紧跟着的是编译器的路径，跳过这个路径。
continue; continue;
} }
if (!strcmp(cur, "-integrated-as")) continue; if (!strcmp(cur, "-integrated-as")) continue;//如果参数是"-integrated-as"，跳过它。
if (!strcmp(cur, "-pipe")) continue; if (!strcmp(cur, "-pipe")) continue;//如果参数是"-pipe"，跳过它。
#if defined(__FreeBSD__) && defined(__x86_64__) #if defined(__FreeBSD__) && defined(__x86_64__)
if (!strcmp(cur, "-m32")) m32_set = 1; if (!strcmp(cur, "-m32")) m32_set = 1;
#endif #endif
if (!strcmp(cur, "-fsanitize=address") || if (!strcmp(cur, "-fsanitize=address") ||
!strcmp(cur, "-fsanitize=memory")) asan_set = 1; !strcmp(cur, "-fsanitize=memory")) asan_set = 1;//如果参数是"-fsanitize=address"或"-fsanitize=memory"，设置asan_set标志。
if (strstr(cur, "FORTIFY_SOURCE")) fortify_set = 1; if (strstr(cur, "FORTIFY_SOURCE")) fortify_set = 1;//如果参数包含"FORTIFY_SOURCE"，设置fortify_set标志。
cc_params[cc_par_cnt++] = cur; cc_params[cc_par_cnt++] = cur;
@ -216,9 +224,11 @@ static void edit_params(u32 argc, char** argv) {
cc_params[cc_par_cnt++] = "-B"; cc_params[cc_par_cnt++] = "-B";
cc_params[cc_par_cnt++] = as_path; cc_params[cc_par_cnt++] = as_path;
//向参数列表中添加"-B"和AFL汇编器的路径。
if (clang_mode) if (clang_mode)
cc_params[cc_par_cnt++] = "-no-integrated-as"; cc_params[cc_par_cnt++] = "-no-integrated-as";//如果clang_mode标志设置，向参数列表中添加`"-no-integrated-as"
if (getenv("AFL_HARDEN")) { if (getenv("AFL_HARDEN")) {
@ -229,38 +239,38 @@ static void edit_params(u32 argc, char** argv) {
} }
if (asan_set) { if (asan_set) {//检查是否设置了asan_set标志。
/* Pass this on to afl-as to adjust map density. */ /* Pass this on to afl-as to adjust map density. */
setenv("AFL_USE_ASAN", "1", 1); setenv("AFL_USE_ASAN", "1", 1);//如果设置，设置环境变量AFL_USE_ASAN为"1"
} else if (getenv("AFL_USE_ASAN")) { } else if (getenv("AFL_USE_ASAN")) {//如果asan_set标志未设置，但设置了环境变量AFL_USE_ASAN。
if (getenv("AFL_USE_MSAN")) if (getenv("AFL_USE_MSAN"))
FATAL("ASAN and MSAN are mutually exclusive"); FATAL("ASAN and MSAN are mutually exclusive");//如果同时设置了AFL_USE_MSAN，输出错误信息并终止程序。
if (getenv("AFL_HARDEN")) if (getenv("AFL_HARDEN"))
FATAL("ASAN and AFL_HARDEN are mutually exclusive"); FATAL("ASAN and AFL_HARDEN are mutually exclusive");//如果同时设置了AFL_HARDEN，输出错误信息并终止程序。
cc_params[cc_par_cnt++] = "-U_FORTIFY_SOURCE"; cc_params[cc_par_cnt++] = "-U_FORTIFY_SOURCE";
cc_params[cc_par_cnt++] = "-fsanitize=address"; cc_params[cc_par_cnt++] = "-fsanitize=address";//向参数列表中添加"-U_FORTIFY_SOURCE"和"-fsanitize=address"。
} else if (getenv("AFL_USE_MSAN")) { } else if (getenv("AFL_USE_MSAN")) {
if (getenv("AFL_USE_ASAN")) if (getenv("AFL_USE_ASAN"))
FATAL("ASAN and MSAN are mutually exclusive"); FATAL("ASAN and MSAN are mutually exclusive");//如果同时设置了AFL_USE_ASAN，输出错误信息并终止程序。
if (getenv("AFL_HARDEN")) if (getenv("AFL_HARDEN"))
FATAL("MSAN and AFL_HARDEN are mutually exclusive"); FATAL("MSAN and AFL_HARDEN are mutually exclusive");//如果同时设置了AFL_HARDEN，输出错误信息并终止程序。
cc_params[cc_par_cnt++] = "-U_FORTIFY_SOURCE"; cc_params[cc_par_cnt++] = "-U_FORTIFY_SOURCE";
cc_params[cc_par_cnt++] = "-fsanitize=memory"; cc_params[cc_par_cnt++] = "-fsanitize=memory";//向参数列表中添加"-U_FORTIFY_SOURCE"和"-fsanitize=memory"。
} }
if (!getenv("AFL_DONT_OPTIMIZE")) { if (!getenv("AFL_DONT_OPTIMIZE")) {//检查是否设置了环境变量AFL_DONT_OPTIMIZE。
#if defined(__FreeBSD__) && defined(__x86_64__) #if defined(__FreeBSD__) && defined(__x86_64__)
@ -269,22 +279,23 @@ static void edit_params(u32 argc, char** argv) {
that bug. */ that bug. */
if (!clang_mode || !m32_set) if (!clang_mode || !m32_set)
cc_params[cc_par_cnt++] = "-g"; cc_params[cc_par_cnt++] = "-g";//如果不是Clang模式或没有设置m32_set标志，向参数列表中添加"-g"。
#else #else
cc_params[cc_par_cnt++] = "-g"; cc_params[cc_par_cnt++] = "-g";
#endif #endif//结束#if defined(__FreeBSD__) && defined(__x86_64__)条件编译块。
cc_params[cc_par_cnt++] = "-O3"; cc_params[cc_par_cnt++] = "-O3";
cc_params[cc_par_cnt++] = "-funroll-loops"; cc_params[cc_par_cnt++] = "-funroll-loops";//向参数列表中添加"-O3"和"-funroll-loops"，这些是优化选项。
/* Two indicators that you're building for fuzzing; one of them is /* Two indicators that you're building for fuzzing; one of them is
AFL-specific, the other is shared with libfuzzer. */ AFL-specific, the other is shared with libfuzzer. */
cc_params[cc_par_cnt++] = "-D__AFL_COMPILER=1"; cc_params[cc_par_cnt++] = "-D__AFL_COMPILER=1";
cc_params[cc_par_cnt++] = "-DFUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION=1"; cc_params[cc_par_cnt++] = "-DFUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION=1";
//向参数列表中添加两个宏定义，这些宏定义指示编译器代码将用于模糊测试。
} }
@ -297,7 +308,7 @@ static void edit_params(u32 argc, char** argv) {
cc_params[cc_par_cnt++] = "-fno-builtin-memcmp"; cc_params[cc_par_cnt++] = "-fno-builtin-memcmp";
cc_params[cc_par_cnt++] = "-fno-builtin-strstr"; cc_params[cc_par_cnt++] = "-fno-builtin-strstr";
cc_params[cc_par_cnt++] = "-fno-builtin-strcasestr"; cc_params[cc_par_cnt++] = "-fno-builtin-strcasestr";
//如果设置，向参数列表中添加一系列"-fno-builtin-*"选项，这些选项禁用编译器的内置函数。
} }
cc_params[cc_par_cnt] = NULL; cc_params[cc_par_cnt] = NULL;
@ -306,7 +317,7 @@ static void edit_params(u32 argc, char** argv) {
/* Main entry point */ /* Main entry point */
//最后是函数结束语，结束函数定义。
int main(int argc, char** argv) { int main(int argc, char** argv) {
if (isatty(2) && !getenv("AFL_QUIET")) { if (isatty(2) && !getenv("AFL_QUIET")) {

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