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@ -36,414 +36,378 @@
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*/
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*/
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#define AFL_MAIN
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#define AFL_MAIN // 定义主程序宏
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#include "config.h"
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#include "config.h" // 包含配置文件
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#include "types.h"
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#include "types.h" // 包含类型定义
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#include "debug.h"
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#include "debug.h" // 包含调试工具
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#include "alloc-inl.h"
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#include "alloc-inl.h" // 包含内存分配工具
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#include "afl-as.h"
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#include "afl-as.h" // 包含AFL汇编插桩头文件
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#include <stdio.h>
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#include <stdio.h> // 标准输入输出
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#include <unistd.h>
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#include <unistd.h> // POSIX标准库
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#include <stdlib.h>
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#include <stdlib.h> // 标准库
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#include <string.h>
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#include <string.h> // 字符串处理
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#include <time.h>
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#include <time.h> // 时间处理
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#include <ctype.h>
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#include <ctype.h> // 字符处理
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#include <fcntl.h>
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#include <fcntl.h> // 文件控制
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#include <sys/wait.h>
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#include <sys/wait.h> // 进程等待
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#include <sys/time.h>
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#include <sys/time.h> // 时间处理
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static u8** as_params; /* Parameters passed to the real 'as' */
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static u8** as_params; // 传递给真实 'as' 的参数
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static u8* input_file; /* Originally specified input file */
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static u8* input_file; // 原始输入文件
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static u8* modified_file; /* Instrumented file for the real 'as' */
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static u8* modified_file; // 插桩后的文件
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static u8 be_quiet, /* Quiet mode (no stderr output) */
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static u8 be_quiet, // 静默模式（不输出错误信息）
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clang_mode, /* Running in clang mode? */
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clang_mode, // 是否在clang模式下运行
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pass_thru, /* Just pass data through? */
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pass_thru, // 是否直接传递数据
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just_version, /* Just show version? */
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just_version, // 是否只显示版本
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sanitizer; /* Using ASAN / MSAN */
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sanitizer; // 是否使用ASAN / MSAN
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static u32 inst_ratio = 100, /* Instrumentation probability (%) */
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static u32 inst_ratio = 100, // 插桩概率（%）
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as_par_cnt = 1; /* Number of params to 'as' */
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as_par_cnt = 1; // 传递给 'as' 的参数数量
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/* If we don't find --32 or --64 in the command line, default to
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// 如果命令行中没有找到 --32 或 --64 参数，则默认对编译该工具时使用的模式进行插桩。
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instrumentation for whichever mode we were compiled with. This is not
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// 这不是完美的，但对于大多数使用场景来说已经足够了。
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perfect, but should do the trick for almost all use cases. */
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#ifdef WORD_SIZE_64
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#ifdef WORD_SIZE_64 // 如果是64位系统
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static u8 use_64bit = 1;
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static u8 use_64bit = 1; // 使用64位模式
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#else
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#else // 否则
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static u8 use_64bit = 0;
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static u8 use_64bit = 0; // 使用32位模式
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#ifdef __APPLE__
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#ifdef __APPLE__ // 如果是苹果系统
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# error "Sorry, 32-bit Apple platforms are not supported."
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# error "Sorry, 32-bit Apple platforms are not supported." // 不支持32位苹果平台
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#endif /* __APPLE__ */
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#endif /* __APPLE__ */
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#endif /* ^WORD_SIZE_64 */
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#endif /* ^WORD_SIZE_64 */
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/* Examine and modify parameters to pass to 'as'. Note that the file name
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// 检查并修改传递给 'as' 的参数。注意 GCC 总是将文件名作为最后一个参数传递给 'as'，
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is always the last parameter passed by GCC, so we exploit this property
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// 因此我们利用这一特性来简化代码。
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to keep the code simple. */
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static void edit_params(int argc, char** argv) {
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static void edit_params(int argc, char** argv) {
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u8 *tmp_dir = getenv("TMPDIR"), *afl_as = getenv("AFL_AS");
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u8 *tmp_dir = getenv("TMPDIR"), *afl_as = getenv("AFL_AS"); // 获取临时目录和AFL_AS环境变量
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u32 i;
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u32 i; // 循环变量
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#ifdef __APPLE__
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#ifdef __APPLE__ // 如果是苹果系统
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u8 use_clang_as = 0;
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u8 use_clang_as = 0; // 是否使用clang作为汇编器
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/* On MacOS X, the Xcode cctool 'as' driver is a bit stale and does not work
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// 在 MacOS X 上，Xcode cctool 'as' 驱动程序有点过时，无法处理由用户自己编译的较新版本的 clang
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with the code generated by newer versions of clang that are hand-built
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// 生成的代码。详见此线程：http://goo.gl/HBWDtn.
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by the user. See the thread here: http://goo.gl/HBWDtn.
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To work around this, when using clang and running without AFL_AS
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// 为了绕过这一问题，当使用 clang 且未指定 AFL_AS 时，我们将实际调用 'clang -c' 而不是 'as -q'
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specified, we will actually call 'clang -c' instead of 'as -q' to
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// 来编译汇编文件.
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compile the assembly file.
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The tools aren't cmdline-compatible, but at least for now, we can
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// 虽然这两个工具不是命令行兼容的，但我们可以通过进行一些小的修改来让它们在某些情况下似乎可以很好地协同工作。
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seemingly get away with this by making only very minor tweaks. Thanks
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// 感谢 Nico Weber 提出这一思路。
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to Nico Weber for the idea. */
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if (clang_mode && !afl_as) {
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if (clang_mode && !afl_as) { // 如果是clang模式且没有指定AFL_AS
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use_clang_as = 1;
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use_clang_as = 1; // 使用clang作为汇编器
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afl_as = getenv("AFL_CC");
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afl_as = getenv("AFL_CC"); // 获取AFL_CC环境变量
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if (!afl_as) afl_as = getenv("AFL_CXX");
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if (!afl_as) afl_as = getenv("AFL_CXX"); // 如果没有AFL_CC，则获取AFL_CXX
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if (!afl_as) afl_as = "clang";
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if (!afl_as) afl_as = "clang"; // 如果都没有，则默认使用clang
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}
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}
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#endif /* __APPLE__ */
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#endif /* __APPLE__ */
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/* Although this is not documented, GCC also uses TEMP and TMP when TMPDIR
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// 虽然这在文档中没有提及，但 GCC 实际上也使用 TEMP 和 TMP（当 TMPDIR 未设置时）。
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is not set. We need to check these non-standard variables to properly
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// 我们需要检查这些非常规变量以正确处理 pass_thru 逻辑。
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handle the pass_thru logic later on. */
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if (!tmp_dir) tmp_dir = getenv("TEMP");
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if (!tmp_dir) tmp_dir = getenv("TEMP"); // 如果没有TMPDIR，则获取TEMP
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if (!tmp_dir) tmp_dir = getenv("TMP");
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if (!tmp_dir) tmp_dir = getenv("TMP"); // 如果没有TEMP，则获取TMP
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if (!tmp_dir) tmp_dir = "/tmp";
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if (!tmp_dir) tmp_dir = "/tmp"; // 如果都没有，则默认使用/tmp
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as_params = ck_alloc((argc + 32) * sizeof(u8*));
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as_params = ck_alloc((argc + 32) * sizeof(u8*)); // 分配参数数组内存
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as_params[0] = afl_as ? afl_as : (u8*)"as";
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as_params[0] = afl_as ? afl_as : (u8*)"as"; // 设置第一个参数为AFL_AS或默认的as
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as_params[argc] = 0;
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as_params[argc] = 0; // 设置最后一个参数为NULL
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for (i = 1; i < argc - 1; i++) {
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for (i = 1; i < argc - 1; i++) { // 遍历参数
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if (!strcmp(argv[i], "--64")) use_64bit = 1;
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if (!strcmp(argv[i], "--64")) use_64bit = 1; // 如果参数是--64，则使用64位模式
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else if (!strcmp(argv[i], "--32")) use_64bit = 0;
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else if (!strcmp(argv[i], "--32")) use_64bit = 0; // 如果参数是--32，则使用32位模式
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#ifdef __APPLE__
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#ifdef __APPLE__ // 如果是苹果系统
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/* The Apple case is a bit different... */
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// MacOS X 的情况有点不同...
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if (!strcmp(argv[i], "-arch") && i + 1 < argc) {
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if (!strcmp(argv[i], "-arch") && i + 1 < argc) { // 如果参数是-arch
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if (!strcmp(argv[i + 1], "x86_64")) use_64bit = 1;
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if (!strcmp(argv[i + 1], "x86_64")) use_64bit = 1; // 如果架构是x86_64，则使用64位模式
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else if (!strcmp(argv[i + 1], "i386"))
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else if (!strcmp(argv[i + 1], "i386")) // 如果架构是i386
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FATAL("Sorry, 32-bit Apple platforms are not supported.");
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FATAL("Sorry, 32-bit Apple platforms are not supported."); // 不支持32位苹果平台
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}
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}
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/* Strip options that set the preference for a particular upstream
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// 移除 Xcode 中设置特定上游汇编器的选项
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assembler in Xcode. */
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if (clang_mode && (!strcmp(argv[i], "-q") || !strcmp(argv[i], "-Q")))
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if (clang_mode && (!strcmp(argv[i], "-q") || !strcmp(argv[i], "-Q"))) // 如果是clang模式且参数是-q或-Q
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continue;
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continue; // 跳过这些参数
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#endif /* __APPLE__ */
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#endif /* __APPLE__ */
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as_params[as_par_cnt++] = argv[i];
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as_params[as_par_cnt++] = argv[i]; // 将参数添加到as_params数组中
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}
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}
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#ifdef __APPLE__
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#ifdef __APPLE__ // 如果是苹果系统
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/* When calling clang as the upstream assembler, append -c -x assembler
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// 当调用 clang 作为上游汇编器时，追加 -c -x assembler 选项并希望一切顺利。
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and hope for the best. */
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if (use_clang_as) {
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if (use_clang_as) { // 如果使用clang作为汇编器
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as_params[as_par_cnt++] = "-c";
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as_params[as_par_cnt++] = "-c"; // 添加-c参数
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as_params[as_par_cnt++] = "-x";
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as_params[as_par_cnt++] = "-x"; // 添加-x参数
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as_params[as_par_cnt++] = "assembler";
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as_params[as_par_cnt++] = "assembler"; // 添加assembler参数
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}
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}
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#endif /* __APPLE__ */
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#endif /* __APPLE__ */
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input_file = argv[argc - 1];
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input_file = argv[argc - 1]; // 获取输入文件
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if (input_file[0] == '-') {
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if (input_file[0] == '-') { // 如果输入文件是标准输入
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if (!strcmp(input_file + 1, "-version")) {
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if (!strcmp(input_file + 1, "-version")) { // 如果参数是-version
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just_version = 1;
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just_version = 1; // 设置只显示版本
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modified_file = input_file;
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modified_file = input_file; // 设置修改后的文件为输入文件
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goto wrap_things_up;
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goto wrap_things_up; // 跳转到结束处理
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}
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}
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if (input_file[1]) FATAL("Incorrect use (not called through afl-gcc?)");
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if (input_file[1]) FATAL("Incorrect use (not called through afl-gcc?)"); // 如果输入文件不是标准输入
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else input_file = NULL;
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else input_file = NULL; // 否则设置为NULL
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} else {
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} else { // 如果输入文件不是标准输入
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/* Check if this looks like a standard invocation as a part of an attempt
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// 检查是否为标准调用，作为编译程序的一部分，而不是使用 gcc 对一个独立的 .s 文件进行编译。
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to compile a program, rather than using gcc on an ad-hoc .s file in
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// 这解决了在编译 NSS 时遇到的问题。
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a format we may not understand. This works around an issue compiling
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NSS. */
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|
|
if (strncmp(input_file, tmp_dir, strlen(tmp_dir)) &&
|
|
|
|
if (strncmp(input_file, tmp_dir, strlen(tmp_dir)) && // 如果输入文件不在临时目录
|
|
|
|
strncmp(input_file, "/var/tmp/", 9) &&
|
|
|
|
strncmp(input_file, "/var/tmp/", 9) && // 且不在/var/tmp/
|
|
|
|
strncmp(input_file, "/tmp/", 5)) pass_thru = 1;
|
|
|
|
strncmp(input_file, "/tmp/", 5)) pass_thru = 1; // 且不在/tmp/，则设置为pass_thru模式
|
|
|
|
|
|
|
|
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
modified_file = alloc_printf("%s/.afl-%u-%u.s", tmp_dir, getpid(),
|
|
|
|
modified_file = alloc_printf("%s/.afl-%u-%u.s", tmp_dir, getpid(), // 生成修改后的文件名
|
|
|
|
(u32)time(NULL));
|
|
|
|
(u32)time(NULL));
|
|
|
|
|
|
|
|
|
|
|
|
wrap_things_up:
|
|
|
|
wrap_things_up: // 结束处理
|
|
|
|
|
|
|
|
|
|
|
|
as_params[as_par_cnt++] = modified_file;
|
|
|
|
as_params[as_par_cnt++] = modified_file; // 将修改后的文件添加到参数数组
|
|
|
|
as_params[as_par_cnt] = NULL;
|
|
|
|
as_params[as_par_cnt] = NULL; // 设置最后一个参数为NULL
|
|
|
|
|
|
|
|
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/* Process input file, generate modified_file. Insert instrumentation in all
|
|
|
|
// 处理输入文件并生成 modified_file。在所有适当的位置插入插桩代码。
|
|
|
|
the appropriate places. */
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
static void add_instrumentation(void) {
|
|
|
|
static void add_instrumentation(void) {
|
|
|
|
|
|
|
|
|
|
|
|
static u8 line[MAX_LINE];
|
|
|
|
static u8 line[MAX_LINE]; // 读取文件的缓冲区
|
|
|
|
|
|
|
|
|
|
|
|
FILE* inf;
|
|
|
|
FILE* inf; // 输入文件指针
|
|
|
|
FILE* outf;
|
|
|
|
FILE* outf; // 输出文件指针
|
|
|
|
s32 outfd;
|
|
|
|
s32 outfd; // 输出文件描述符
|
|
|
|
u32 ins_lines = 0;
|
|
|
|
u32 ins_lines = 0; // 插桩的行数
|
|
|
|
|
|
|
|
|
|
|
|
u8 instr_ok = 0, skip_csect = 0, skip_next_label = 0,
|
|
|
|
u8 instr_ok = 0, skip_csect = 0, skip_next_label = 0, // 插桩状态标志
|
|
|
|
skip_intel = 0, skip_app = 0, instrument_next = 0;
|
|
|
|
skip_intel = 0, skip_app = 0, instrument_next = 0;
|
|
|
|
|
|
|
|
|
|
|
|
#ifdef __APPLE__
|
|
|
|
#ifdef __APPLE__ // 如果是苹果系统
|
|
|
|
|
|
|
|
|
|
|
|
u8* colon_pos;
|
|
|
|
u8* colon_pos; // 冒号位置
|
|
|
|
|
|
|
|
|
|
|
|
#endif /* __APPLE__ */
|
|
|
|
#endif /* __APPLE__ */
|
|
|
|
|
|
|
|
|
|
|
|
if (input_file) {
|
|
|
|
if (input_file) { // 如果有输入文件
|
|
|
|
|
|
|
|
|
|
|
|
inf = fopen(input_file, "r");
|
|
|
|
inf = fopen(input_file, "r"); // 打开输入文件
|
|
|
|
if (!inf) PFATAL("Unable to read '%s'", input_file);
|
|
|
|
if (!inf) PFATAL("Unable to read '%s'", input_file); // 如果打开失败则报错
|
|
|
|
|
|
|
|
|
|
|
|
} else inf = stdin;
|
|
|
|
} else inf = stdin; // 否则使用标准输入
|
|
|
|
|
|
|
|
|
|
|
|
outfd = open(modified_file, O_WRONLY | O_EXCL | O_CREAT, 0600);
|
|
|
|
outfd = open(modified_file, O_WRONLY | O_EXCL | O_CREAT, 0600); // 打开输出文件
|
|
|
|
|
|
|
|
|
|
|
|
if (outfd < 0) PFATAL("Unable to write to '%s'", modified_file);
|
|
|
|
if (outfd < 0) PFATAL("Unable to write to '%s'", modified_file); // 如果打开失败则报错
|
|
|
|
|
|
|
|
|
|
|
|
outf = fdopen(outfd, "w");
|
|
|
|
outf = fdopen(outfd, "w"); // 将文件描述符转换为文件指针
|
|
|
|
|
|
|
|
|
|
|
|
if (!outf) PFATAL("fdopen() failed");
|
|
|
|
if (!outf) PFATAL("fdopen() failed"); // 如果转换失败则报错
|
|
|
|
|
|
|
|
|
|
|
|
while (fgets(line, MAX_LINE, inf)) {
|
|
|
|
while (fgets(line, MAX_LINE, inf)) { // 逐行读取输入文件
|
|
|
|
|
|
|
|
|
|
|
|
/* In some cases, we want to defer writing the instrumentation trampoline
|
|
|
|
// 在某些情况下，我们希望在所有标签、宏、注释等之后再插入插桩跳板代码。
|
|
|
|
until after all the labels, macros, comments, etc. If we're in this
|
|
|
|
// 如果处于这一模式，且行以制表符开头，后跟一个字母，则现在插入跳板代码。
|
|
|
|
mode, and if the line starts with a tab followed by a character, dump
|
|
|
|
|
|
|
|
the trampoline now. */
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
if (!pass_thru && !skip_intel && !skip_app && !skip_csect && instr_ok &&
|
|
|
|
if (!pass_thru && !skip_intel && !skip_app && !skip_csect && instr_ok &&
|
|
|
|
instrument_next && line[0] == '\t' && isalpha(line[1])) {
|
|
|
|
instrument_next && line[0] == '\t' && isalpha(line[1])) { // 如果满足插桩条件
|
|
|
|
|
|
|
|
|
|
|
|
fprintf(outf, use_64bit ? trampoline_fmt_64 : trampoline_fmt_32,
|
|
|
|
fprintf(outf, use_64bit ? trampoline_fmt_64 : trampoline_fmt_32, // 插入跳板代码
|
|
|
|
R(MAP_SIZE));
|
|
|
|
R(MAP_SIZE));
|
|
|
|
|
|
|
|
|
|
|
|
instrument_next = 0;
|
|
|
|
instrument_next = 0; // 重置插桩标志
|
|
|
|
ins_lines++;
|
|
|
|
ins_lines++; // 增加插桩行数
|
|
|
|
|
|
|
|
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/* Output the actual line, call it a day in pass-thru mode. */
|
|
|
|
// 输出实际的行，在 pass-thru 模式下结束操作。
|
|
|
|
|
|
|
|
|
|
|
|
fputs(line, outf);
|
|
|
|
fputs(line, outf); // 输出当前行
|
|
|
|
|
|
|
|
|
|
|
|
if (pass_thru) continue;
|
|
|
|
if (pass_thru) continue; // 如果是pass-thru模式则跳过
|
|
|
|
|
|
|
|
|
|
|
|
/* All right, this is where the actual fun begins. For one, we only want to
|
|
|
|
// 现在开始真正的插桩操作。首先，我们只希望插桩 .text 部分。
|
|
|
|
instrument the .text section. So, let's keep track of that in processed
|
|
|
|
// 因此，我们需要跟踪处理的汇编文件中各部分的状态，并据此设置 instr_ok。
|
|
|
|
files - and let's set instr_ok accordingly. */
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
if (line[0] == '\t' && line[1] == '.') {
|
|
|
|
if (line[0] == '\t' && line[1] == '.') { // 如果行以制表符和点开头
|
|
|
|
|
|
|
|
|
|
|
|
/* OpenBSD puts jump tables directly inline with the code, which is
|
|
|
|
// OpenBSD 在代码中直接放置跳转表，这稍微有点麻烦。
|
|
|
|
a bit annoying. They use a specific format of p2align directives
|
|
|
|
// 它们使用特定格式的 p2align 指令围绕它们，因此我们可以使用该格式作为信号。
|
|
|
|
around them, so we use that as a signal. */
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
if (!clang_mode && instr_ok && !strncmp(line + 2, "p2align ", 8) &&
|
|
|
|
if (!clang_mode && instr_ok && !strncmp(line + 2, "p2align ", 8) && // 如果是OpenBSD的p2align指令
|
|
|
|
isdigit(line[10]) && line[11] == '\n') skip_next_label = 1;
|
|
|
|
isdigit(line[10]) && line[11] == '\n') skip_next_label = 1; // 设置跳过下一个标签
|
|
|
|
|
|
|
|
|
|
|
|
if (!strncmp(line + 2, "text\n", 5) ||
|
|
|
|
if (!strncmp(line + 2, "text\n", 5) || // 如果是.text部分
|
|
|
|
!strncmp(line + 2, "section\t.text", 13) ||
|
|
|
|
!strncmp(line + 2, "section\t.text", 13) || // 或者section .text
|
|
|
|
!strncmp(line + 2, "section\t__TEXT,__text", 21) ||
|
|
|
|
!strncmp(line + 2, "section\t__TEXT,__text", 21) || // 或者section __TEXT,__text
|
|
|
|
!strncmp(line + 2, "section __TEXT,__text", 21)) {
|
|
|
|
!strncmp(line + 2, "section __TEXT,__text", 21)) { // 或者section __TEXT,__text
|
|
|
|
instr_ok = 1;
|
|
|
|
instr_ok = 1; // 设置插桩标志
|
|
|
|
continue;
|
|
|
|
continue; // 继续
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
if (!strncmp(line + 2, "section\t", 8) ||
|
|
|
|
if (!strncmp(line + 2, "section\t", 8) || // 如果是其他section
|
|
|
|
!strncmp(line + 2, "section ", 8) ||
|
|
|
|
!strncmp(line + 2, "section ", 8) || // 或者其他section
|
|
|
|
!strncmp(line + 2, "bss\n", 4) ||
|
|
|
|
!strncmp(line + 2, "bss\n", 4) || // 或者.bss部分
|
|
|
|
!strncmp(line + 2, "data\n", 5)) {
|
|
|
|
!strncmp(line + 2, "data\n", 5)) { // 或者.data部分
|
|
|
|
instr_ok = 0;
|
|
|
|
instr_ok = 0; // 重置插桩标志
|
|
|
|
continue;
|
|
|
|
continue; // 继续
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/* Detect off-flavor assembly (rare, happens in gdb). When this is
|
|
|
|
// 检测非常规汇编（罕见，例如在 gdb 中）。当遇到这种汇编时，我们设置 skip_csect
|
|
|
|
encountered, we set skip_csect until the opposite directive is
|
|
|
|
// 直到遇到相反的指令，此时我们不进行插桩。
|
|
|
|
seen, and we do not instrument. */
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
if (strstr(line, ".code")) {
|
|
|
|
if (strstr(line, ".code")) { // 如果行包含.code
|
|
|
|
|
|
|
|
|
|
|
|
if (strstr(line, ".code32")) skip_csect = use_64bit;
|
|
|
|
if (strstr(line, ".code32")) skip_csect = use_64bit; // 如果是.code32，则根据64位模式设置skip_csect
|
|
|
|
if (strstr(line, ".code64")) skip_csect = !use_64bit;
|
|
|
|
if (strstr(line, ".code64")) skip_csect = !use_64bit; // 如果是.code64，则根据64位模式设置skip_csect
|
|
|
|
|
|
|
|
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/* Detect syntax changes, as could happen with hand-written assembly.
|
|
|
|
// 检测并跳过手写汇编块（__asm__），同样不进行插桩。
|
|
|
|
Skip Intel blocks, resume instrumentation when back to AT&T. */
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
if (strstr(line, ".intel_syntax")) skip_intel = 1;
|
|
|
|
if (line[0] == '#' || line[1] == '#') { // 如果行以#开头
|
|
|
|
if (strstr(line, ".att_syntax")) skip_intel = 0;
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/* Detect and skip ad-hoc __asm__ blocks, likewise skipping them. */
|
|
|
|
if (strstr(line, "#APP")) skip_app = 1; // 如果包含#APP，则设置skip_app
|
|
|
|
|
|
|
|
if (strstr(line, "#NO_APP")) skip_app = 0; // 如果包含#NO_APP，则重置skip_app
|
|
|
|
if (line[0] == '#' || line[1] == '#') {
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
if (strstr(line, "#APP")) skip_app = 1;
|
|
|
|
|
|
|
|
if (strstr(line, "#NO_APP")) skip_app = 0;
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/* If we're in the right mood for instrumenting, check for function
|
|
|
|
// 如果我们处于插桩模式，检查函数名或条件标签。这里逻辑有些复杂，但基本目标是捕获：
|
|
|
|
names or conditional labels. This is a bit messy, but in essence,
|
|
|
|
|
|
|
|
we want to catch:
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
^main: - function entry point (always instrumented)
|
|
|
|
// ^main: - 函数入口点（总是插桩）
|
|
|
|
^.L0: - GCC branch label
|
|
|
|
// ^.L0: - GCC 分支标签
|
|
|
|
^.LBB0_0: - clang branch label (but only in clang mode)
|
|
|
|
// ^.LBB0_0: - clang 分支标签（但仅在 clang 模式下）
|
|
|
|
^\tjnz foo - conditional branches
|
|
|
|
// ^\tjnz foo - 条件分支
|
|
|
|
|
|
|
|
|
|
|
|
...but not:
|
|
|
|
// ...而不捕获：
|
|
|
|
|
|
|
|
|
|
|
|
^# BB#0: - clang comments
|
|
|
|
// ^# BB#0: - clang 注释
|
|
|
|
^ # BB#0: - ditto
|
|
|
|
// ^ # BB#0: - 同上
|
|
|
|
^.Ltmp0: - clang non-branch labels
|
|
|
|
// ^.Ltmp0: - clang 非分支标签
|
|
|
|
^.LC0 - GCC non-branch labels
|
|
|
|
// ^.LC0 - GCC 非分支标签
|
|
|
|
^.LBB0_0: - ditto (when in GCC mode)
|
|
|
|
// ^.LBB0_0: - 同上（当处于 GCC 模式下）
|
|
|
|
^\tjmp foo - non-conditional jumps
|
|
|
|
// ^\tjmp foo - 非条件跳转
|
|
|
|
|
|
|
|
|
|
|
|
Additionally, clang and GCC on MacOS X follow a different convention
|
|
|
|
// 此外，MacOS X 上的 clang 和 GCC 使用不同的标签格式，没有前导点，因此我们根据这一情况处理。
|
|
|
|
with no leading dots on labels, hence the weird maze of #ifdefs
|
|
|
|
|
|
|
|
later on.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
*/
|
|
|
|
if (skip_intel || skip_app || skip_csect || !instr_ok || // 如果跳过插桩
|
|
|
|
|
|
|
|
line[0] == '#' || line[0] == ' ') continue; // 或者行以#或空格开头，则跳过
|
|
|
|
|
|
|
|
|
|
|
|
if (skip_intel || skip_app || skip_csect || !instr_ok ||
|
|
|
|
// 条件分支指令（jnz 等）。我们会在分支之后插入插桩（以插桩不执行路径），
|
|
|
|
line[0] == '#' || line[0] == ' ') continue;
|
|
|
|
// 并在分支目标标签处插入（稍后处理）。
|
|
|
|
|
|
|
|
|
|
|
|
/* Conditional branch instruction (jnz, etc). We append the instrumentation
|
|
|
|
if (line[0] == '\t') { // 如果行以制表符开头
|
|
|
|
right after the branch (to instrument the not-taken path) and at the
|
|
|
|
|
|
|
|
branch destination label (handled later on). */
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
if (line[0] == '\t') {
|
|
|
|
if (line[1] == 'j' && line[2] != 'm' && R(100) < inst_ratio) { // 如果是条件分支指令
|
|
|
|
|
|
|
|
|
|
|
|
if (line[1] == 'j' && line[2] != 'm' && R(100) < inst_ratio) {
|
|
|
|
fprintf(outf, use_64bit ? trampoline_fmt_64 : trampoline_fmt_32, // 插入跳板代码
|
|
|
|
|
|
|
|
|
|
|
|
fprintf(outf, use_64bit ? trampoline_fmt_64 : trampoline_fmt_32,
|
|
|
|
|
|
|
|
R(MAP_SIZE));
|
|
|
|
R(MAP_SIZE));
|
|
|
|
|
|
|
|
|
|
|
|
ins_lines++;
|
|
|
|
ins_lines++; // 增加插桩行数
|
|
|
|
|
|
|
|
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
continue;
|
|
|
|
continue; // 继续
|
|
|
|
|
|
|
|
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/* Label of some sort. This may be a branch destination, but we need to
|
|
|
|
// 某类标签。这可能是分支目标，但我们需要小心处理不同的格式约定。
|
|
|
|
tread carefully and account for several different formatting
|
|
|
|
|
|
|
|
conventions. */
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
#ifdef __APPLE__
|
|
|
|
#ifdef __APPLE__ // 如果是苹果系统
|
|
|
|
|
|
|
|
|
|
|
|
/* Apple: L<whatever><digit>: */
|
|
|
|
// MacOS X: L<whatever><digit>:
|
|
|
|
|
|
|
|
|
|
|
|
if ((colon_pos = strstr(line, ":"))) {
|
|
|
|
if ((colon_pos = strstr(line, ":"))) { // 如果行包含冒号
|
|
|
|
|
|
|
|
|
|
|
|
if (line[0] == 'L' && isdigit(*(colon_pos - 1))) {
|
|
|
|
if (line[0] == 'L' && isdigit(*(colon_pos - 1))) { // 如果标签以L开头且冒号前是数字
|
|
|
|
|
|
|
|
|
|
|
|
#else
|
|
|
|
#else // 否则
|
|
|
|
|
|
|
|
|
|
|
|
/* Everybody else: .L<whatever>: */
|
|
|
|
// 其他人：.L<whatever>:
|
|
|
|
|
|
|
|
|
|
|
|
if (strstr(line, ":")) {
|
|
|
|
if (strstr(line, ":")) { // 如果行包含冒号
|
|
|
|
|
|
|
|
|
|
|
|
if (line[0] == '.') {
|
|
|
|
if (line[0] == '.') { // 如果标签以点开头
|
|
|
|
|
|
|
|
|
|
|
|
#endif /* __APPLE__ */
|
|
|
|
#endif /* __APPLE__ */
|
|
|
|
|
|
|
|
|
|
|
|
/* .L0: or LBB0_0: style jump destination */
|
|
|
|
// .L0: 或 LBB0_0: 风格的分支目标
|
|
|
|
|
|
|
|
|
|
|
|
#ifdef __APPLE__
|
|
|
|
#ifdef __APPLE__ // 如果是苹果系统
|
|
|
|
|
|
|
|
|
|
|
|
/* Apple: L<num> / LBB<num> */
|
|
|
|
// MacOS X: L<num> / LBB<num>
|
|
|
|
|
|
|
|
|
|
|
|
if ((isdigit(line[1]) || (clang_mode && !strncmp(line, "LBB", 3)))
|
|
|
|
if ((isdigit(line[1]) || (clang_mode && !strncmp(line, "LBB", 3))) // 如果标签是L<num>或LBB<num>
|
|
|
|
&& R(100) < inst_ratio) {
|
|
|
|
&& R(100) < inst_ratio) { // 并且随机数小于插桩概率
|
|
|
|
|
|
|
|
|
|
|
|
#else
|
|
|
|
#else // 否则
|
|
|
|
|
|
|
|
|
|
|
|
/* Apple: .L<num> / .LBB<num> */
|
|
|
|
// MacOS X: .L<num> / .LBB<num>
|
|
|
|
|
|
|
|
|
|
|
|
if ((isdigit(line[2]) || (clang_mode && !strncmp(line + 1, "LBB", 3)))
|
|
|
|
if ((isdigit(line[2]) || (clang_mode && !strncmp(line + 1, "LBB", 3))) // 如果标签是.L<num>或.LBB<num>
|
|
|
|
&& R(100) < inst_ratio) {
|
|
|
|
&& R(100) < inst_ratio) { // 并且随机数小于插桩概率
|
|
|
|
|
|
|
|
|
|
|
|
#endif /* __APPLE__ */
|
|
|
|
#endif /* __APPLE__ */
|
|
|
|
|
|
|
|
|
|
|
|
/* An optimization is possible here by adding the code only if the
|
|
|
|
// 在仅需要在标签被引用时（非调用/跳转上下文）才添加代码的情况下可以进行优化。
|
|
|
|
label is mentioned in the code in contexts other than call / jmp.
|
|
|
|
// 这会引入两遍处理过程的复杂性（当使用 stdin 时尤其麻烦），并且通常只能带来不到 10% 的速度提升。
|
|
|
|
That said, this complicates the code by requiring two-pass
|
|
|
|
// 因为编译器通常不会生成不相关的函数内跳转。
|
|
|
|
processing (messy with stdin), and results in a speed gain
|
|
|
|
|
|
|
|
typically under 10%, because compilers are generally pretty good
|
|
|
|
|
|
|
|
about not generating spurious intra-function jumps.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
We use deferred output chiefly to avoid disrupting
|
|
|
|
// 我们使用延迟输出主要是为了避免干扰 MacOS X 上 .Lfunc_begin0 风格异常处理计算的问题。
|
|
|
|
.Lfunc_begin0-style exception handling calculations (a problem on
|
|
|
|
|
|
|
|
MacOS X). */
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
if (!skip_next_label) instrument_next = 1; else skip_next_label = 0;
|
|
|
|
if (!skip_next_label) instrument_next = 1; else skip_next_label = 0; // 设置插桩标志
|
|
|
|
|
|
|
|
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
} else {
|
|
|
|
} else { // 否则
|
|
|
|
|
|
|
|
|
|
|
|
/* Function label (always instrumented, deferred mode). */
|
|
|
|
// 函数标签（总是插桩，延迟模式）。
|
|
|
|
|
|
|
|
|
|
|
|
instrument_next = 1;
|
|
|
|
instrument_next = 1; // 设置插桩标志
|
|
|
|
|
|
|
|
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
@ -451,17 +415,17 @@ static void add_instrumentation(void) {
|
|
|
|
|
|
|
|
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
if (ins_lines)
|
|
|
|
if (ins_lines) // 如果有插桩行
|
|
|
|
fputs(use_64bit ? main_payload_64 : main_payload_32, outf);
|
|
|
|
fputs(use_64bit ? main_payload_64 : main_payload_32, outf); // 插入主插桩代码
|
|
|
|
|
|
|
|
|
|
|
|
if (input_file) fclose(inf);
|
|
|
|
if (input_file) fclose(inf); // 关闭输入文件
|
|
|
|
fclose(outf);
|
|
|
|
fclose(outf); // 关闭输出文件
|
|
|
|
|
|
|
|
|
|
|
|
if (!be_quiet) {
|
|
|
|
if (!be_quiet) { // 如果不是静默模式
|
|
|
|
|
|
|
|
|
|
|
|
if (!ins_lines) WARNF("No instrumentation targets found%s.",
|
|
|
|
if (!ins_lines) WARNF("No instrumentation targets found%s.", // 如果没有插桩目标
|
|
|
|
pass_thru ? " (pass-thru mode)" : "");
|
|
|
|
pass_thru ? " (pass-thru mode)" : "");
|
|
|
|
else OKF("Instrumented %u locations (%s-bit, %s mode, ratio %u%%).",
|
|
|
|
else OKF("Instrumented %u locations (%s-bit, %s mode, ratio %u%%).", // 输出插桩信息
|
|
|
|
ins_lines, use_64bit ? "64" : "32",
|
|
|
|
ins_lines, use_64bit ? "64" : "32",
|
|
|
|
getenv("AFL_HARDEN") ? "hardened" :
|
|
|
|
getenv("AFL_HARDEN") ? "hardened" :
|
|
|
|
(sanitizer ? "ASAN/MSAN" : "non-hardened"),
|
|
|
|
(sanitizer ? "ASAN/MSAN" : "non-hardened"),
|
|
|
|
@ -472,27 +436,27 @@ static void add_instrumentation(void) {
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/* Main entry point */
|
|
|
|
// 程序主入口点
|
|
|
|
|
|
|
|
|
|
|
|
int main(int argc, char** argv) {
|
|
|
|
int main(int argc, char** argv) {
|
|
|
|
|
|
|
|
|
|
|
|
s32 pid;
|
|
|
|
s32 pid; // 进程ID
|
|
|
|
u32 rand_seed;
|
|
|
|
u32 rand_seed; // 随机种子
|
|
|
|
int status;
|
|
|
|
int status; // 进程状态
|
|
|
|
u8* inst_ratio_str = getenv("AFL_INST_RATIO");
|
|
|
|
u8* inst_ratio_str = getenv("AFL_INST_RATIO"); // 获取插桩概率环境变量
|
|
|
|
|
|
|
|
|
|
|
|
struct timeval tv;
|
|
|
|
struct timeval tv; // 时间结构
|
|
|
|
struct timezone tz;
|
|
|
|
struct timezone tz; // 时区结构
|
|
|
|
|
|
|
|
|
|
|
|
clang_mode = !!getenv(CLANG_ENV_VAR);
|
|
|
|
clang_mode = !!getenv(CLANG_ENV_VAR); // 设置clang模式
|
|
|
|
|
|
|
|
|
|
|
|
if (isatty(2) && !getenv("AFL_QUIET")) {
|
|
|
|
if (isatty(2) && !getenv("AFL_QUIET")) { // 如果是终端且没有设置AFL_QUIET
|
|
|
|
|
|
|
|
|
|
|
|
SAYF(cCYA "afl-as " cBRI VERSION cRST " by <lcamtuf@google.com>\n");
|
|
|
|
SAYF(cCYA "afl-as " cBRI VERSION cRST " by <lcamtuf@google.com>\n"); // 输出版本信息
|
|
|
|
|
|
|
|
|
|
|
|
} else be_quiet = 1;
|
|
|
|
} else be_quiet = 1; // 否则设置为静默模式
|
|
|
|
|
|
|
|
|
|
|
|
if (argc < 2) {
|
|
|
|
if (argc < 2) { // 如果参数少于2个
|
|
|
|
|
|
|
|
|
|
|
|
SAYF("\n"
|
|
|
|
SAYF("\n"
|
|
|
|
"This is a helper application for afl-fuzz. It is a wrapper around GNU 'as',\n"
|
|
|
|
"This is a helper application for afl-fuzz. It is a wrapper around GNU 'as',\n"
|
|
|
|
@ -501,57 +465,55 @@ int main(int argc, char** argv) {
|
|
|
|
|
|
|
|
|
|
|
|
"Rarely, when dealing with extremely complex projects, it may be advisable to\n"
|
|
|
|
"Rarely, when dealing with extremely complex projects, it may be advisable to\n"
|
|
|
|
"set AFL_INST_RATIO to a value less than 100 in order to reduce the odds of\n"
|
|
|
|
"set AFL_INST_RATIO to a value less than 100 in order to reduce the odds of\n"
|
|
|
|
"instrumenting every discovered branch.\n\n");
|
|
|
|
"instrumenting every discovered branch.\n\n"); // 输出帮助信息
|
|
|
|
|
|
|
|
|
|
|
|
exit(1);
|
|
|
|
exit(1); // 退出
|
|
|
|
|
|
|
|
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
gettimeofday(&tv, &tz);
|
|
|
|
gettimeofday(&tv, &tz); // 获取当前时间
|
|
|
|
|
|
|
|
|
|
|
|
rand_seed = tv.tv_sec ^ tv.tv_usec ^ getpid();
|
|
|
|
rand_seed = tv.tv_sec ^ tv.tv_usec ^ getpid(); // 生成随机种子
|
|
|
|
|
|
|
|
|
|
|
|
srandom(rand_seed);
|
|
|
|
srandom(rand_seed); // 设置随机种子
|
|
|
|
|
|
|
|
|
|
|
|
edit_params(argc, argv);
|
|
|
|
edit_params(argc, argv); // 编辑参数
|
|
|
|
|
|
|
|
|
|
|
|
if (inst_ratio_str) {
|
|
|
|
if (inst_ratio_str) { // 如果有插桩概率环境变量
|
|
|
|
|
|
|
|
|
|
|
|
if (sscanf(inst_ratio_str, "%u", &inst_ratio) != 1 || inst_ratio > 100)
|
|
|
|
if (sscanf(inst_ratio_str, "%u", &inst_ratio) != 1 || inst_ratio > 100) // 如果解析失败或大于100
|
|
|
|
FATAL("Bad value of AFL_INST_RATIO (must be between 0 and 100)");
|
|
|
|
FATAL("Bad value of AFL_INST_RATIO (must be between 0 and 100)"); // 报错
|
|
|
|
|
|
|
|
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
if (getenv(AS_LOOP_ENV_VAR))
|
|
|
|
if (getenv(AS_LOOP_ENV_VAR)) // 如果设置了AS_LOOP_ENV_VAR
|
|
|
|
FATAL("Endless loop when calling 'as' (remove '.' from your PATH)");
|
|
|
|
FATAL("Endless loop when calling 'as' (remove '.' from your PATH)"); // 报错
|
|
|
|
|
|
|
|
|
|
|
|
setenv(AS_LOOP_ENV_VAR, "1", 1);
|
|
|
|
setenv(AS_LOOP_ENV_VAR, "1", 1); // 设置AS_LOOP_ENV_VAR
|
|
|
|
|
|
|
|
|
|
|
|
/* When compiling with ASAN, we don't have a particularly elegant way to skip
|
|
|
|
// 使用 ASAN 时，我们没有特别优雅的方法来跳过 ASAN 特定的分支。
|
|
|
|
ASAN-specific branches. But we can probabilistically compensate for
|
|
|
|
// 但可以通过按概率补偿来解决这个问题...
|
|
|
|
that... */
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
if (getenv("AFL_USE_ASAN") || getenv("AFL_USE_MSAN")) {
|
|
|
|
if (getenv("AFL_USE_ASAN") || getenv("AFL_USE_MSAN")) { // 如果使用ASAN或MSAN
|
|
|
|
sanitizer = 1;
|
|
|
|
sanitizer = 1; // 设置sanitizer标志
|
|
|
|
inst_ratio /= 3;
|
|
|
|
inst_ratio /= 3; // 降低插桩概率
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
if (!just_version) add_instrumentation();
|
|
|
|
if (!just_version) add_instrumentation(); // 如果不是只显示版本，则进行插桩
|
|
|
|
|
|
|
|
|
|
|
|
if (!(pid = fork())) {
|
|
|
|
if (!(pid = fork())) { // 创建子进程
|
|
|
|
|
|
|
|
|
|
|
|
execvp(as_params[0], (char**)as_params);
|
|
|
|
execvp(as_params[0], (char**)as_params); // 执行as命令
|
|
|
|
FATAL("Oops, failed to execute '%s' - check your PATH", as_params[0]);
|
|
|
|
FATAL("Oops, failed to execute '%s' - check your PATH", as_params[0]); // 如果执行失败则报错
|
|
|
|
|
|
|
|
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
if (pid < 0) PFATAL("fork() failed");
|
|
|
|
if (pid < 0) PFATAL("fork() failed"); // 如果fork失败则报错
|
|
|
|
|
|
|
|
|
|
|
|
if (waitpid(pid, &status, 0) <= 0) PFATAL("waitpid() failed");
|
|
|
|
if (waitpid(pid, &status, 0) <= 0) PFATAL("waitpid() failed"); // 等待子进程结束
|
|
|
|
|
|
|
|
|
|
|
|
if (!getenv("AFL_KEEP_ASSEMBLY")) unlink(modified_file);
|
|
|
|
if (!getenv("AFL_KEEP_ASSEMBLY")) unlink(modified_file); // 如果没有设置AFL_KEEP_ASSEMBLY，则删除修改后的文件
|
|
|
|
|
|
|
|
|
|
|
|
exit(WEXITSTATUS(status));
|
|
|
|
exit(WEXITSTATUS(status)); // 退出
|
|
|
|
|
|
|
|
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
