Index: third_party/afl/src/afl-showmap.c |
diff --git a/third_party/afl/src/afl-showmap.c b/third_party/afl/src/afl-showmap.c |
new file mode 100644 |
index 0000000000000000000000000000000000000000..cd66772e1245afa16d6551893aab0ba65fe05987 |
--- /dev/null |
+++ b/third_party/afl/src/afl-showmap.c |
@@ -0,0 +1,728 @@ |
+/* |
+ american fuzzy lop - map display utility |
+ ---------------------------------------- |
+ |
+ Written and maintained by Michal Zalewski <lcamtuf@google.com> |
+ |
+ Copyright 2013, 2014, 2015, 2016 Google Inc. 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 |
+ |
+ A very simple tool that runs the targeted binary and displays |
+ the contents of the trace bitmap in a human-readable form. Useful in |
+ scripts to eliminate redundant inputs and perform other checks. |
+ |
+ Exit code is 2 if the target program crashes; 1 if it times out or |
+ there is a problem executing it; or 0 if execution is successful. |
+ |
+ */ |
+ |
+#define AFL_MAIN |
+ |
+#include "config.h" |
+#include "types.h" |
+#include "debug.h" |
+#include "alloc-inl.h" |
+#include "hash.h" |
+ |
+#include <stdio.h> |
+#include <unistd.h> |
+#include <stdlib.h> |
+#include <string.h> |
+#include <time.h> |
+#include <errno.h> |
+#include <signal.h> |
+#include <dirent.h> |
+#include <fcntl.h> |
+ |
+#include <sys/wait.h> |
+#include <sys/time.h> |
+#include <sys/shm.h> |
+#include <sys/stat.h> |
+#include <sys/types.h> |
+#include <sys/resource.h> |
+ |
+static s32 child_pid; /* PID of the tested program */ |
+ |
+static u8* trace_bits; /* SHM with instrumentation bitmap */ |
+ |
+static u8 *out_file, /* Trace output file */ |
+ *doc_path, /* Path to docs */ |
+ *target_path, /* Path to target binary */ |
+ *at_file; /* Substitution string for @@ */ |
+ |
+static u32 exec_tmout; /* Exec timeout (ms) */ |
+ |
+static u64 mem_limit = MEM_LIMIT; /* Memory limit (MB) */ |
+ |
+static s32 shm_id; /* ID of the SHM region */ |
+ |
+static u8 quiet_mode, /* Hide non-essential messages? */ |
+ edges_only, /* Ignore hit counts? */ |
+ cmin_mode; /* Generate output in afl-cmin mode? */ |
+ |
+static volatile u8 |
+ stop_soon, /* Ctrl-C pressed? */ |
+ child_timed_out, /* Child timed out? */ |
+ child_crashed; /* Child crashed? */ |
+ |
+/* Classify tuple counts. Instead of mapping to individual bits, as in |
+ afl-fuzz.c, we map to more user-friendly numbers between 1 and 8. */ |
+ |
+#define AREP4(_sym) (_sym), (_sym), (_sym), (_sym) |
+#define AREP8(_sym) AREP4(_sym), AREP4(_sym) |
+#define AREP16(_sym) AREP8(_sym), AREP8(_sym) |
+#define AREP32(_sym) AREP16(_sym), AREP16(_sym) |
+#define AREP64(_sym) AREP32(_sym), AREP32(_sym) |
+#define AREP128(_sym) AREP64(_sym), AREP64(_sym) |
+ |
+static u8 count_class_lookup[256] = { |
+ |
+ /* 0 - 3: 4 */ 0, 1, 2, 3, |
+ /* 4 - 7: +4 */ AREP4(4), |
+ /* 8 - 15: +8 */ AREP8(5), |
+ /* 16 - 31: +16 */ AREP16(6), |
+ /* 32 - 127: +96 */ AREP64(7), AREP32(7), |
+ /* 128+: +128 */ AREP128(8) |
+ |
+}; |
+ |
+static void classify_counts(u8* mem) { |
+ |
+ u32 i = MAP_SIZE; |
+ |
+ if (edges_only) { |
+ |
+ while (i--) { |
+ if (*mem) *mem = 1; |
+ mem++; |
+ } |
+ |
+ } else { |
+ |
+ while (i--) { |
+ *mem = count_class_lookup[*mem]; |
+ mem++; |
+ } |
+ |
+ } |
+ |
+} |
+ |
+ |
+/* Get rid of shared memory (atexit handler). */ |
+ |
+static void remove_shm(void) { |
+ |
+ shmctl(shm_id, IPC_RMID, NULL); |
+ |
+} |
+ |
+ |
+/* Configure shared memory. */ |
+ |
+static void setup_shm(void) { |
+ |
+ u8* shm_str; |
+ |
+ shm_id = shmget(IPC_PRIVATE, MAP_SIZE, IPC_CREAT | IPC_EXCL | 0600); |
+ |
+ if (shm_id < 0) PFATAL("shmget() failed"); |
+ |
+ atexit(remove_shm); |
+ |
+ shm_str = alloc_printf("%d", shm_id); |
+ |
+ setenv(SHM_ENV_VAR, shm_str, 1); |
+ |
+ ck_free(shm_str); |
+ |
+ trace_bits = shmat(shm_id, NULL, 0); |
+ |
+ if (!trace_bits) PFATAL("shmat() failed"); |
+ |
+} |
+ |
+/* Write results. */ |
+ |
+static u32 write_results(void) { |
+ |
+ s32 fd; |
+ FILE* f; |
+ u32 i, ret = 0; |
+ u8 cco = !!getenv("AFL_CMIN_CRASHES_ONLY"), |
+ caa = !!getenv("AFL_CMIN_ALLOW_ANY"); |
+ |
+ if (!strncmp(out_file, "/dev/", 5)) { |
+ |
+ fd = open(out_file, O_WRONLY, 0600); |
+ if (fd < 0) PFATAL("Unable to open '%s'", out_file); |
+ |
+ } else if (!strcmp(out_file, "-")) { |
+ |
+ fd = dup(1); |
+ if (fd < 0) PFATAL("Unable to open stdout"); |
+ |
+ } else { |
+ |
+ unlink(out_file); /* Ignore errors */ |
+ fd = open(out_file, O_WRONLY | O_CREAT | O_EXCL, 0600); |
+ if (fd < 0) PFATAL("Unable to create '%s'", out_file); |
+ |
+ } |
+ |
+ f = fdopen(fd, "w"); |
+ |
+ if (!f) PFATAL("fdopen() failed"); |
+ |
+ for (i = 0; i < MAP_SIZE; i++) { |
+ |
+ if (!trace_bits[i]) continue; |
+ ret++; |
+ |
+ if (cmin_mode) { |
+ |
+ if (child_timed_out) break; |
+ if (!caa && child_crashed != cco) break; |
+ |
+ fprintf(f, "%u%u\n", trace_bits[i], i); |
+ |
+ } else fprintf(f, "%06u:%u\n", i, trace_bits[i]); |
+ |
+ } |
+ |
+ fclose(f); |
+ |
+ return ret; |
+ |
+} |
+ |
+ |
+/* Handle timeout signal. */ |
+ |
+static void handle_timeout(int sig) { |
+ |
+ child_timed_out = 1; |
+ if (child_pid > 0) kill(child_pid, SIGKILL); |
+ |
+} |
+ |
+ |
+/* Execute target application. */ |
+ |
+static void run_target(char** argv) { |
+ |
+ static struct itimerval it; |
+ int status = 0; |
+ |
+ if (!quiet_mode) |
+ SAYF("-- Program output begins --\n" cRST); |
+ |
+ MEM_BARRIER(); |
+ |
+ child_pid = fork(); |
+ |
+ if (child_pid < 0) PFATAL("fork() failed"); |
+ |
+ if (!child_pid) { |
+ |
+ struct rlimit r; |
+ |
+ if (quiet_mode) { |
+ |
+ s32 fd = open("/dev/null", O_RDWR); |
+ |
+ if (fd < 0 || dup2(fd, 1) < 0 || dup2(fd, 2) < 0) { |
+ *(u32*)trace_bits = EXEC_FAIL_SIG; |
+ PFATAL("Descriptor initialization failed"); |
+ } |
+ |
+ close(fd); |
+ |
+ } |
+ |
+ if (mem_limit) { |
+ |
+ r.rlim_max = r.rlim_cur = ((rlim_t)mem_limit) << 20; |
+ |
+#ifdef RLIMIT_AS |
+ |
+ setrlimit(RLIMIT_AS, &r); /* Ignore errors */ |
+ |
+#else |
+ |
+ setrlimit(RLIMIT_DATA, &r); /* Ignore errors */ |
+ |
+#endif /* ^RLIMIT_AS */ |
+ |
+ } |
+ |
+ r.rlim_max = r.rlim_cur = 0; |
+ setrlimit(RLIMIT_CORE, &r); /* Ignore errors */ |
+ |
+ execv(target_path, argv); |
+ |
+ *(u32*)trace_bits = EXEC_FAIL_SIG; |
+ exit(0); |
+ |
+ } |
+ |
+ /* Configure timeout, wait for child, cancel timeout. */ |
+ |
+ if (exec_tmout) { |
+ |
+ child_timed_out = 0; |
+ it.it_value.tv_sec = (exec_tmout / 1000); |
+ it.it_value.tv_usec = (exec_tmout % 1000) * 1000; |
+ |
+ } |
+ |
+ setitimer(ITIMER_REAL, &it, NULL); |
+ |
+ if (waitpid(child_pid, &status, 0) <= 0) FATAL("waitpid() failed"); |
+ |
+ child_pid = 0; |
+ it.it_value.tv_sec = 0; |
+ it.it_value.tv_usec = 0; |
+ setitimer(ITIMER_REAL, &it, NULL); |
+ |
+ MEM_BARRIER(); |
+ |
+ /* Clean up bitmap, analyze exit condition, etc. */ |
+ |
+ if (*(u32*)trace_bits == EXEC_FAIL_SIG) |
+ FATAL("Unable to execute '%s'", argv[0]); |
+ |
+ classify_counts(trace_bits); |
+ |
+ if (!quiet_mode) |
+ SAYF(cRST "-- Program output ends --\n"); |
+ |
+ if (!child_timed_out && !stop_soon && WIFSIGNALED(status)) |
+ child_crashed = 1; |
+ |
+ if (!quiet_mode) { |
+ |
+ if (child_timed_out) |
+ SAYF(cLRD "\n+++ Program timed off +++\n" cRST); |
+ else if (stop_soon) |
+ SAYF(cLRD "\n+++ Program aborted by user +++\n" cRST); |
+ else if (child_crashed) |
+ SAYF(cLRD "\n+++ Program killed by signal %u +++\n" cRST, WTERMSIG(status)); |
+ |
+ } |
+ |
+ |
+} |
+ |
+ |
+/* Handle Ctrl-C and the like. */ |
+ |
+static void handle_stop_sig(int sig) { |
+ |
+ stop_soon = 1; |
+ |
+ if (child_pid > 0) kill(child_pid, SIGKILL); |
+ |
+} |
+ |
+ |
+/* Do basic preparations - persistent fds, filenames, etc. */ |
+ |
+static void set_up_environment(void) { |
+ |
+ setenv("ASAN_OPTIONS", "abort_on_error=1:" |
+ "detect_leaks=0:" |
+ "symbolize=0:" |
+ "allocator_may_return_null=1", 0); |
+ |
+ setenv("MSAN_OPTIONS", "exit_code=" STRINGIFY(MSAN_ERROR) ":" |
+ "symbolize=0:" |
+ "abort_on_error=1:" |
+ "allocator_may_return_null=1:" |
+ "msan_track_origins=0", 0); |
+ |
+ if (getenv("AFL_LD_PRELOAD")) |
+ setenv("LD_PRELOAD", getenv("AFL_LD_PRELOAD"), 1); |
+ |
+} |
+ |
+ |
+/* Setup signal handlers, duh. */ |
+ |
+static void setup_signal_handlers(void) { |
+ |
+ struct sigaction sa; |
+ |
+ sa.sa_handler = NULL; |
+ sa.sa_flags = SA_RESTART; |
+ sa.sa_sigaction = NULL; |
+ |
+ sigemptyset(&sa.sa_mask); |
+ |
+ /* Various ways of saying "stop". */ |
+ |
+ sa.sa_handler = handle_stop_sig; |
+ sigaction(SIGHUP, &sa, NULL); |
+ sigaction(SIGINT, &sa, NULL); |
+ sigaction(SIGTERM, &sa, NULL); |
+ |
+ /* Exec timeout notifications. */ |
+ |
+ sa.sa_handler = handle_timeout; |
+ sigaction(SIGALRM, &sa, NULL); |
+ |
+} |
+ |
+ |
+/* Detect @@ in args. */ |
+ |
+static void detect_file_args(char** argv) { |
+ |
+ u32 i = 0; |
+ u8* cwd = getcwd(NULL, 0); |
+ |
+ if (!cwd) PFATAL("getcwd() failed"); |
+ |
+ while (argv[i]) { |
+ |
+ u8* aa_loc = strstr(argv[i], "@@"); |
+ |
+ if (aa_loc) { |
+ |
+ u8 *aa_subst, *n_arg; |
+ |
+ if (!at_file) FATAL("@@ syntax is not supported by this tool."); |
+ |
+ /* Be sure that we're always using fully-qualified paths. */ |
+ |
+ if (at_file[0] == '/') aa_subst = at_file; |
+ else aa_subst = alloc_printf("%s/%s", cwd, at_file); |
+ |
+ /* Construct a replacement argv value. */ |
+ |
+ *aa_loc = 0; |
+ n_arg = alloc_printf("%s%s%s", argv[i], aa_subst, aa_loc + 2); |
+ argv[i] = n_arg; |
+ *aa_loc = '@'; |
+ |
+ if (at_file[0] != '/') ck_free(aa_subst); |
+ |
+ } |
+ |
+ i++; |
+ |
+ } |
+ |
+ free(cwd); /* not tracked */ |
+ |
+} |
+ |
+ |
+/* Show banner. */ |
+ |
+static void show_banner(void) { |
+ |
+ SAYF(cCYA "afl-showmap " cBRI VERSION cRST " by <lcamtuf@google.com>\n"); |
+ |
+} |
+ |
+/* Display usage hints. */ |
+ |
+static void usage(u8* argv0) { |
+ |
+ show_banner(); |
+ |
+ SAYF("\n%s [ options ] -- /path/to/target_app [ ... ]\n\n" |
+ |
+ "Required parameters:\n\n" |
+ |
+ " -o file - file to write the trace data to\n\n" |
+ |
+ "Execution control settings:\n\n" |
+ |
+ " -t msec - timeout for each run (none)\n" |
+ " -m megs - memory limit for child process (%u MB)\n" |
+ " -Q - use binary-only instrumentation (QEMU mode)\n\n" |
+ |
+ "Other settings:\n\n" |
+ |
+ " -q - sink program's output and don't show messages\n" |
+ " -e - show edge coverage only, ignore hit counts\n\n" |
+ |
+ "This tool displays raw tuple data captured by AFL instrumentation.\n" |
+ "For additional help, consult %s/README.\n\n" cRST, |
+ |
+ argv0, MEM_LIMIT, doc_path); |
+ |
+ exit(1); |
+ |
+} |
+ |
+ |
+/* Find binary. */ |
+ |
+static void find_binary(u8* fname) { |
+ |
+ u8* env_path = 0; |
+ struct stat st; |
+ |
+ if (strchr(fname, '/') || !(env_path = getenv("PATH"))) { |
+ |
+ target_path = ck_strdup(fname); |
+ |
+ if (stat(target_path, &st) || !S_ISREG(st.st_mode) || |
+ !(st.st_mode & 0111) || st.st_size < 4) |
+ FATAL("Program '%s' not found or not executable", fname); |
+ |
+ } else { |
+ |
+ while (env_path) { |
+ |
+ u8 *cur_elem, *delim = strchr(env_path, ':'); |
+ |
+ if (delim) { |
+ |
+ cur_elem = ck_alloc(delim - env_path + 1); |
+ memcpy(cur_elem, env_path, delim - env_path); |
+ delim++; |
+ |
+ } else cur_elem = ck_strdup(env_path); |
+ |
+ env_path = delim; |
+ |
+ if (cur_elem[0]) |
+ target_path = alloc_printf("%s/%s", cur_elem, fname); |
+ else |
+ target_path = ck_strdup(fname); |
+ |
+ ck_free(cur_elem); |
+ |
+ if (!stat(target_path, &st) && S_ISREG(st.st_mode) && |
+ (st.st_mode & 0111) && st.st_size >= 4) break; |
+ |
+ ck_free(target_path); |
+ target_path = 0; |
+ |
+ } |
+ |
+ if (!target_path) FATAL("Program '%s' not found or not executable", fname); |
+ |
+ } |
+ |
+} |
+ |
+ |
+/* Fix up argv for QEMU. */ |
+ |
+static char** get_qemu_argv(u8* own_loc, char** argv, int argc) { |
+ |
+ char** new_argv = ck_alloc(sizeof(char*) * (argc + 4)); |
+ u8 *tmp, *cp, *rsl, *own_copy; |
+ |
+ memcpy(new_argv + 3, argv + 1, sizeof(char*) * argc); |
+ |
+ new_argv[2] = target_path; |
+ new_argv[1] = "--"; |
+ |
+ /* Now we need to actually find qemu for argv[0]. */ |
+ |
+ tmp = getenv("AFL_PATH"); |
+ |
+ if (tmp) { |
+ |
+ cp = alloc_printf("%s/afl-qemu-trace", tmp); |
+ |
+ if (access(cp, X_OK)) |
+ FATAL("Unable to find '%s'", tmp); |
+ |
+ target_path = new_argv[0] = cp; |
+ return new_argv; |
+ |
+ } |
+ |
+ own_copy = ck_strdup(own_loc); |
+ rsl = strrchr(own_copy, '/'); |
+ |
+ if (rsl) { |
+ |
+ *rsl = 0; |
+ |
+ cp = alloc_printf("%s/afl-qemu-trace", own_copy); |
+ ck_free(own_copy); |
+ |
+ if (!access(cp, X_OK)) { |
+ |
+ target_path = new_argv[0] = cp; |
+ return new_argv; |
+ |
+ } |
+ |
+ } else ck_free(own_copy); |
+ |
+ if (!access(BIN_PATH "/afl-qemu-trace", X_OK)) { |
+ |
+ target_path = new_argv[0] = BIN_PATH "/afl-qemu-trace"; |
+ return new_argv; |
+ |
+ } |
+ |
+ FATAL("Unable to find 'afl-qemu-trace'."); |
+ |
+} |
+ |
+ |
+/* Main entry point */ |
+ |
+int main(int argc, char** argv) { |
+ |
+ s32 opt; |
+ u8 mem_limit_given = 0, timeout_given = 0, qemu_mode = 0; |
+ u32 tcnt; |
+ char** use_argv; |
+ |
+ doc_path = access(DOC_PATH, F_OK) ? "docs" : DOC_PATH; |
+ |
+ while ((opt = getopt(argc,argv,"+o:m:t:A:eqZQ")) > 0) |
+ |
+ switch (opt) { |
+ |
+ case 'o': |
+ |
+ if (out_file) FATAL("Multiple -o options not supported"); |
+ out_file = optarg; |
+ break; |
+ |
+ case 'm': { |
+ |
+ u8 suffix = 'M'; |
+ |
+ if (mem_limit_given) FATAL("Multiple -m options not supported"); |
+ mem_limit_given = 1; |
+ |
+ if (!strcmp(optarg, "none")) { |
+ |
+ mem_limit = 0; |
+ break; |
+ |
+ } |
+ |
+ if (sscanf(optarg, "%llu%c", &mem_limit, &suffix) < 1 || |
+ optarg[0] == '-') FATAL("Bad syntax used for -m"); |
+ |
+ switch (suffix) { |
+ |
+ case 'T': mem_limit *= 1024 * 1024; break; |
+ case 'G': mem_limit *= 1024; break; |
+ case 'k': mem_limit /= 1024; break; |
+ case 'M': break; |
+ |
+ default: FATAL("Unsupported suffix or bad syntax for -m"); |
+ |
+ } |
+ |
+ if (mem_limit < 5) FATAL("Dangerously low value of -m"); |
+ |
+ if (sizeof(rlim_t) == 4 && mem_limit > 2000) |
+ FATAL("Value of -m out of range on 32-bit systems"); |
+ |
+ } |
+ |
+ break; |
+ |
+ case 't': |
+ |
+ if (timeout_given) FATAL("Multiple -t options not supported"); |
+ timeout_given = 1; |
+ |
+ if (strcmp(optarg, "none")) { |
+ exec_tmout = atoi(optarg); |
+ |
+ if (exec_tmout < 20 || optarg[0] == '-') |
+ FATAL("Dangerously low value of -t"); |
+ |
+ } |
+ |
+ break; |
+ |
+ case 'e': |
+ |
+ if (edges_only) FATAL("Multiple -e options not supported"); |
+ edges_only = 1; |
+ break; |
+ |
+ case 'q': |
+ |
+ if (quiet_mode) FATAL("Multiple -q options not supported"); |
+ quiet_mode = 1; |
+ break; |
+ |
+ case 'Z': |
+ |
+ /* This is an undocumented option to write data in the syntax expected |
+ by afl-cmin. Nobody else should have any use for this. */ |
+ |
+ cmin_mode = 1; |
+ quiet_mode = 1; |
+ break; |
+ |
+ case 'A': |
+ |
+ /* Another afl-cmin specific feature. */ |
+ at_file = optarg; |
+ break; |
+ |
+ case 'Q': |
+ |
+ if (qemu_mode) FATAL("Multiple -Q options not supported"); |
+ if (!mem_limit_given) mem_limit = MEM_LIMIT_QEMU; |
+ |
+ qemu_mode = 1; |
+ break; |
+ |
+ default: |
+ |
+ usage(argv[0]); |
+ |
+ } |
+ |
+ if (optind == argc || !out_file) usage(argv[0]); |
+ |
+ setup_shm(); |
+ setup_signal_handlers(); |
+ |
+ set_up_environment(); |
+ |
+ find_binary(argv[optind]); |
+ |
+ if (!quiet_mode) { |
+ show_banner(); |
+ ACTF("Executing '%s'...\n", target_path); |
+ } |
+ |
+ detect_file_args(argv + optind); |
+ |
+ if (qemu_mode) |
+ use_argv = get_qemu_argv(argv[0], argv + optind, argc - optind); |
+ else |
+ use_argv = argv + optind; |
+ |
+ run_target(use_argv); |
+ |
+ tcnt = write_results(); |
+ |
+ if (!quiet_mode) { |
+ |
+ if (!tcnt) FATAL("No instrumentation detected" cRST); |
+ OKF("Captured %u tuples in '%s'." cRST, tcnt, out_file); |
+ |
+ } |
+ |
+ exit(child_crashed * 2 + child_timed_out); |
+ |
+} |
+ |