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https://github.com/AFLplusplus/AFLplusplus.git
synced 2025-06-16 11:58:08 +00:00
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This commit is contained in:
Andrea Fioraldi
@ -34,16 +34,15 @@
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#include <string.h>
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#include <assert.h>
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static u8* obj_path; /* Path to runtime libraries */
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static u8** cc_params; /* Parameters passed to the real CC */
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static u32 cc_par_cnt = 1; /* Param count, including argv0 */
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static u8* obj_path; /* Path to runtime libraries */
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static u8** cc_params; /* Parameters passed to the real CC */
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static u32 cc_par_cnt = 1; /* Param count, including argv0 */
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/* Try to find the runtime libraries. If that fails, abort. */
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static void find_obj(u8* argv0) {
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u8 *afl_path = getenv("AFL_PATH");
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u8* afl_path = getenv("AFL_PATH");
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u8 *slash, *tmp;
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if (afl_path) {
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@ -51,9 +50,11 @@ static void find_obj(u8* argv0) {
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tmp = alloc_printf("%s/afl-llvm-rt.o", afl_path);
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if (!access(tmp, R_OK)) {
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obj_path = afl_path;
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ck_free(tmp);
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return;
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}
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ck_free(tmp);
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@ -64,7 +65,7 @@ static void find_obj(u8* argv0) {
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if (slash) {
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u8 *dir;
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u8* dir;
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*slash = 0;
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dir = ck_strdup(argv0);
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@ -73,9 +74,11 @@ static void find_obj(u8* argv0) {
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tmp = alloc_printf("%s/afl-llvm-rt.o", dir);
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if (!access(tmp, R_OK)) {
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obj_path = dir;
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ck_free(tmp);
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return;
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}
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ck_free(tmp);
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@ -84,33 +87,43 @@ static void find_obj(u8* argv0) {
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}
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if (!access(AFL_PATH "/afl-llvm-rt.o", R_OK)) {
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obj_path = AFL_PATH;
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return;
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}
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FATAL("Unable to find 'afl-llvm-rt.o' or 'afl-llvm-pass.so.cc'. Please set AFL_PATH");
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}
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FATAL(
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"Unable to find 'afl-llvm-rt.o' or 'afl-llvm-pass.so.cc'. Please set "
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"AFL_PATH");
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}
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/* Copy argv to cc_params, making the necessary edits. */
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static void edit_params(u32 argc, char** argv) {
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u8 fortify_set = 0, asan_set = 0, x_set = 0, maybe_linking = 1, bit_mode = 0;
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u8 *name;
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u8 fortify_set = 0, asan_set = 0, x_set = 0, maybe_linking = 1, bit_mode = 0;
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u8* name;
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cc_params = ck_alloc((argc + 128) * sizeof(u8*));
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name = strrchr(argv[0], '/');
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if (!name) name = argv[0]; else name++;
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if (!name)
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name = argv[0];
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else
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name++;
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if (!strcmp(name, "afl-clang-fast++")) {
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u8* alt_cxx = getenv("AFL_CXX");
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cc_params[0] = alt_cxx ? alt_cxx : (u8*)"clang++";
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} else {
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u8* alt_cc = getenv("AFL_CC");
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cc_params[0] = alt_cc ? alt_cc : (u8*)"clang";
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}
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/* There are three ways to compile with afl-clang-fast. In the traditional
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@ -118,36 +131,50 @@ static void edit_params(u32 argc, char** argv) {
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much faster but has less coverage. Finally tere is the experimental
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'trace-pc-guard' mode, we use native LLVM instrumentation callbacks
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instead. For trace-pc-guard see:
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http://clang.llvm.org/docs/SanitizerCoverage.html#tracing-pcs-with-guards */
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http://clang.llvm.org/docs/SanitizerCoverage.html#tracing-pcs-with-guards
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*/
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// laf
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if (getenv("LAF_SPLIT_SWITCHES")||getenv("AFL_LLVM_LAF_SPLIT_SWITCHES")) {
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if (getenv("LAF_SPLIT_SWITCHES") || getenv("AFL_LLVM_LAF_SPLIT_SWITCHES")) {
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cc_params[cc_par_cnt++] = "-Xclang";
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cc_params[cc_par_cnt++] = "-load";
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cc_params[cc_par_cnt++] = "-Xclang";
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cc_params[cc_par_cnt++] = alloc_printf("%s/split-switches-pass.so", obj_path);
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cc_params[cc_par_cnt++] =
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alloc_printf("%s/split-switches-pass.so", obj_path);
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}
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if (getenv("LAF_TRANSFORM_COMPARES")||getenv("AFL_LLVM_LAF_TRANSFORM_COMPARES")) {
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if (getenv("LAF_TRANSFORM_COMPARES") ||
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getenv("AFL_LLVM_LAF_TRANSFORM_COMPARES")) {
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cc_params[cc_par_cnt++] = "-Xclang";
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cc_params[cc_par_cnt++] = "-load";
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cc_params[cc_par_cnt++] = "-Xclang";
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cc_params[cc_par_cnt++] = alloc_printf("%s/compare-transform-pass.so", obj_path);
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cc_params[cc_par_cnt++] =
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alloc_printf("%s/compare-transform-pass.so", obj_path);
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}
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if (getenv("LAF_SPLIT_COMPARES")||getenv("AFL_LLVM_LAF_SPLIT_COMPARES")) {
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if (getenv("LAF_SPLIT_COMPARES") || getenv("AFL_LLVM_LAF_SPLIT_COMPARES")) {
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cc_params[cc_par_cnt++] = "-Xclang";
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cc_params[cc_par_cnt++] = "-load";
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cc_params[cc_par_cnt++] = "-Xclang";
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cc_params[cc_par_cnt++] = alloc_printf("%s/split-compares-pass.so", obj_path);
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cc_params[cc_par_cnt++] =
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alloc_printf("%s/split-compares-pass.so", obj_path);
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}
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// /laf
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#ifdef USE_TRACE_PC
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cc_params[cc_par_cnt++] = "-fsanitize-coverage=trace-pc-guard"; // edge coverage by default
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//cc_params[cc_par_cnt++] = "-mllvm";
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//cc_params[cc_par_cnt++] = "-fsanitize-coverage=trace-cmp,trace-div,trace-gep";
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//cc_params[cc_par_cnt++] = "-sanitizer-coverage-block-threshold=0";
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cc_params[cc_par_cnt++] =
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"-fsanitize-coverage=trace-pc-guard"; // edge coverage by default
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// cc_params[cc_par_cnt++] = "-mllvm";
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// cc_params[cc_par_cnt++] =
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// "-fsanitize-coverage=trace-cmp,trace-div,trace-gep"; cc_params[cc_par_cnt++]
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// = "-sanitizer-coverage-block-threshold=0";
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#else
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cc_params[cc_par_cnt++] = "-Xclang";
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cc_params[cc_par_cnt++] = "-load";
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@ -165,6 +192,7 @@ static void edit_params(u32 argc, char** argv) {
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if (argc == 1 && !strcmp(argv[1], "-v")) maybe_linking = 0;
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while (--argc) {
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u8* cur = *(++argv);
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if (!strcmp(cur, "-m32")) bit_mode = 32;
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@ -175,15 +203,15 @@ static void edit_params(u32 argc, char** argv) {
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if (!strcmp(cur, "-c") || !strcmp(cur, "-S") || !strcmp(cur, "-E"))
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maybe_linking = 0;
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if (!strcmp(cur, "-fsanitize=address") ||
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!strcmp(cur, "-fsanitize=memory")) asan_set = 1;
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if (!strcmp(cur, "-fsanitize=address") || !strcmp(cur, "-fsanitize=memory"))
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asan_set = 1;
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if (strstr(cur, "FORTIFY_SOURCE")) fortify_set = 1;
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if (!strcmp(cur, "-shared")) maybe_linking = 0;
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if (!strcmp(cur, "-Wl,-z,defs") ||
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!strcmp(cur, "-Wl,--no-undefined")) continue;
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if (!strcmp(cur, "-Wl,-z,defs") || !strcmp(cur, "-Wl,--no-undefined"))
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continue;
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cc_params[cc_par_cnt++] = cur;
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@ -193,8 +221,7 @@ static void edit_params(u32 argc, char** argv) {
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cc_params[cc_par_cnt++] = "-fstack-protector-all";
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if (!fortify_set)
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cc_params[cc_par_cnt++] = "-D_FORTIFY_SOURCE=2";
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if (!fortify_set) cc_params[cc_par_cnt++] = "-D_FORTIFY_SOURCE=2";
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}
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@ -202,8 +229,7 @@ static void edit_params(u32 argc, char** argv) {
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if (getenv("AFL_USE_ASAN")) {
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if (getenv("AFL_USE_MSAN"))
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FATAL("ASAN and MSAN are mutually exclusive");
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if (getenv("AFL_USE_MSAN")) FATAL("ASAN and MSAN are mutually exclusive");
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if (getenv("AFL_HARDEN"))
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FATAL("ASAN and AFL_HARDEN are mutually exclusive");
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@ -213,8 +239,7 @@ static void edit_params(u32 argc, char** argv) {
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} else if (getenv("AFL_USE_MSAN")) {
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if (getenv("AFL_USE_ASAN"))
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FATAL("ASAN and MSAN are mutually exclusive");
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if (getenv("AFL_USE_ASAN")) FATAL("ASAN and MSAN are mutually exclusive");
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if (getenv("AFL_HARDEN"))
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FATAL("MSAN and AFL_HARDEN are mutually exclusive");
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@ -279,35 +304,41 @@ static void edit_params(u32 argc, char** argv) {
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*/
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cc_params[cc_par_cnt++] = "-D__AFL_LOOP(_A)="
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"({ static volatile char *_B __attribute__((used)); "
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" _B = (char*)\"" PERSIST_SIG "\"; "
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cc_params[cc_par_cnt++] =
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"-D__AFL_LOOP(_A)="
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"({ static volatile char *_B __attribute__((used)); "
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" _B = (char*)\"" PERSIST_SIG
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"\"; "
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#ifdef __APPLE__
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"__attribute__((visibility(\"default\"))) "
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"int _L(unsigned int) __asm__(\"___afl_persistent_loop\"); "
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"__attribute__((visibility(\"default\"))) "
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"int _L(unsigned int) __asm__(\"___afl_persistent_loop\"); "
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#else
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"__attribute__((visibility(\"default\"))) "
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"int _L(unsigned int) __asm__(\"__afl_persistent_loop\"); "
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"__attribute__((visibility(\"default\"))) "
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"int _L(unsigned int) __asm__(\"__afl_persistent_loop\"); "
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#endif /* ^__APPLE__ */
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"_L(_A); })";
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"_L(_A); })";
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cc_params[cc_par_cnt++] = "-D__AFL_INIT()="
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"do { static volatile char *_A __attribute__((used)); "
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" _A = (char*)\"" DEFER_SIG "\"; "
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cc_params[cc_par_cnt++] =
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"-D__AFL_INIT()="
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"do { static volatile char *_A __attribute__((used)); "
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" _A = (char*)\"" DEFER_SIG
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"\"; "
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#ifdef __APPLE__
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"__attribute__((visibility(\"default\"))) "
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"void _I(void) __asm__(\"___afl_manual_init\"); "
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"__attribute__((visibility(\"default\"))) "
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"void _I(void) __asm__(\"___afl_manual_init\"); "
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#else
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"__attribute__((visibility(\"default\"))) "
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"void _I(void) __asm__(\"__afl_manual_init\"); "
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"__attribute__((visibility(\"default\"))) "
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"void _I(void) __asm__(\"__afl_manual_init\"); "
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#endif /* ^__APPLE__ */
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"_I(); } while (0)";
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"_I(); } while (0)";
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if (maybe_linking) {
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if (x_set) {
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cc_params[cc_par_cnt++] = "-x";
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cc_params[cc_par_cnt++] = "none";
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}
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switch (bit_mode) {
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@ -340,7 +371,6 @@ static void edit_params(u32 argc, char** argv) {
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}
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/* Main entry point */
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int main(int argc, char** argv) {
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@ -348,46 +378,53 @@ int main(int argc, char** argv) {
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if (isatty(2) && !getenv("AFL_QUIET")) {
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#ifdef USE_TRACE_PC
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SAYF(cCYA "afl-clang-fast" VERSION cRST " [tpcg] by <lszekeres@google.com>\n");
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SAYF(cCYA "afl-clang-fast" VERSION cRST
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" [tpcg] by <lszekeres@google.com>\n");
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#else
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SAYF(cCYA "afl-clang-fast" VERSION cRST " by <lszekeres@google.com>\n");
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SAYF(cCYA "afl-clang-fast" VERSION cRST " by <lszekeres@google.com>\n");
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#endif /* ^USE_TRACE_PC */
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}
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if (argc < 2) {
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SAYF("\n"
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"This is a helper application for afl-fuzz. It serves as a drop-in replacement\n"
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"for clang, letting you recompile third-party code with the required runtime\n"
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"instrumentation. A common use pattern would be one of the following:\n\n"
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SAYF(
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"\n"
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"This is a helper application for afl-fuzz. It serves as a drop-in "
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"replacement\n"
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"for clang, letting you recompile third-party code with the required "
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"runtime\n"
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"instrumentation. A common use pattern would be one of the "
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"following:\n\n"
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" CC=%s/afl-clang-fast ./configure\n"
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" CXX=%s/afl-clang-fast++ ./configure\n\n"
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" CC=%s/afl-clang-fast ./configure\n"
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" CXX=%s/afl-clang-fast++ ./configure\n\n"
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"In contrast to the traditional afl-clang tool, this version is implemented as\n"
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"an LLVM pass and tends to offer improved performance with slow programs.\n\n"
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"In contrast to the traditional afl-clang tool, this version is "
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"implemented as\n"
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"an LLVM pass and tends to offer improved performance with slow "
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"programs.\n\n"
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"You can specify custom next-stage toolchain via AFL_CC and AFL_CXX. Setting\n"
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"AFL_HARDEN enables hardening optimizations in the compiled code.\n\n",
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BIN_PATH, BIN_PATH);
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"You can specify custom next-stage toolchain via AFL_CC and AFL_CXX. "
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"Setting\n"
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"AFL_HARDEN enables hardening optimizations in the compiled code.\n\n",
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BIN_PATH, BIN_PATH);
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exit(1);
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}
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find_obj(argv[0]);
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edit_params(argc, argv);
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/*
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int i = 0;
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printf("EXEC:");
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while (cc_params[i] != NULL)
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printf(" %s", cc_params[i++]);
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printf("\n");
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*/
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/*
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int i = 0;
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printf("EXEC:");
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while (cc_params[i] != NULL)
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printf(" %s", cc_params[i++]);
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printf("\n");
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*/
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execvp(cc_params[0], (char**)cc_params);
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@ -396,3 +433,4 @@ int main(int argc, char** argv) {
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return 0;
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}
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