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@ -101,6 +101,21 @@ |
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#include "duk_trans_socket.h" |
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#endif |
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#if defined(DUK_USE_FUZZILLI) |
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/* REPRL Pipe file descriptors for quicker fuzzing */ |
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#define REPRL_CRFD 100 |
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#define REPRL_CWFD 101 |
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#define REPRL_DRFD 102 |
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#define REPRL_DWFD 103 |
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/* Required includes for coverage tracking */ |
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#include <fcntl.h> |
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#include <errno.h> |
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#include <sys/mman.h> |
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#include <sys/stat.h> |
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#include <unistd.h> |
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#endif |
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#define MEM_LIMIT_NORMAL (128*1024*1024) /* 128 MB */ |
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#define MEM_LIMIT_HIGH (2047*1024*1024) /* ~2 GB */ |
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#define LINEBUF_SIZE 65536 |
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@ -974,6 +989,65 @@ static duk_ret_t sys_execute(duk_context *ctx) { |
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} |
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#endif |
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#if defined(DUK_USE_FUZZILLI) |
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/*
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* Custom builtin for Fuzzilli, used to ensure the fuzzer is properly catching crashes and assert failures |
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*/ |
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void duk_assert_wrapper(int x); |
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static duk_ret_t fuzzilli(duk_context *ctx) { |
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duk_idx_t i, nargs; |
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nargs = duk_get_top(ctx); |
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/* Ensure right number of args */ |
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if(nargs != 2){ |
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return -1; |
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} |
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/* Ensure first arg is a string */ |
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if(!duk_is_string(ctx, 0)){ |
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return -1; |
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} |
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const char * first_arg = duk_get_string(ctx, 0); |
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/*
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* This is to enable |
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*/ |
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if(strcmp(first_arg, "FUZZILLI_CRASH") == 0){ |
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duk_int_t second_arg = duk_get_int(ctx, 1); |
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switch(second_arg){ |
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case 0: |
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*((duk_int_t *)0x41414141) = 0x1337; /* intentionally segfault */ |
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break; |
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default: |
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duk_assert_wrapper(0); /* Intentionally fail assertion */ |
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break; |
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} |
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}else if(strcmp(first_arg, "FUZZILLI_PRINT") == 0){ |
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FILE* fzliout = fdopen(REPRL_DWFD, "w"); |
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if (!fzliout) { |
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fprintf(stderr, "Fuzzer output channel not available, printing to stdout instead\n"); |
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fzliout = stdout; |
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} |
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const char * string = duk_get_string(ctx, 1); |
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if (string == NULL) { |
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return -1; |
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} |
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fprintf(fzliout, "%s\n", string); |
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fflush(fzliout); |
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} |
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return 0; |
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} |
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#endif /* DUK_USE_FUZZILLI */ |
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/*
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* String.fromBufferRaw() |
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*/ |
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@ -1245,6 +1319,15 @@ static duk_context *create_duktape_heap(int alloc_provider, int debugger, int lo |
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} |
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#endif |
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#if defined(DUK_USE_FUZZILLI) |
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/*
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* Add the custom function for fuzzilli |
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*/ |
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duk_push_c_function(ctx, fuzzilli, DUK_VARARGS); |
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duk_put_global_string(ctx, "fuzzilli"); |
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#endif /* DUK_USE_FUZZILLI */ |
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return ctx; |
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} |
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@ -1276,6 +1359,93 @@ static void destroy_duktape_heap(duk_context *ctx, int alloc_provider) { |
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#endif |
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} |
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#if defined(DUK_USE_FUZZILLI) |
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/*
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* Enables coverage tracking for fuzzing |
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*/ |
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void __sanitizer_cov_reset_edgeguards(); |
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#define SHM_SIZE 0x100000 |
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#define MAX_EDGES ((SHM_SIZE - 4) * 8) |
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#define CHECK(cond) if (!(cond)) { fprintf(stderr, "\"" #cond "\" failed\n"); _exit(-1); } |
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struct shmem_data { |
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duk_uint32_t num_edges; |
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unsigned char edges[]; |
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}; |
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struct shmem_data* __shmem; |
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duk_uint32_t *__edges_start, *__edges_stop; |
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void __sanitizer_cov_reset_edgeguards() { |
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duk_uint64_t N = 0; |
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for (duk_uint32_t *x = __edges_start; x < __edges_stop && N < MAX_EDGES; x++) |
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*x = ++N; |
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} |
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void __sanitizer_cov_trace_pc_guard_init(duk_uint32_t *start, duk_uint32_t *stop) { |
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/*
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* Avoid duplicate initialization |
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*/ |
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if (start == stop || *start) |
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return; |
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if (__edges_start != NULL || __edges_stop != NULL) { |
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fprintf(stderr, "Coverage instrumentation is only supported for a single module\n"); |
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_exit(-1); |
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} |
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__edges_start = start; |
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__edges_stop = stop; |
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/*
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* Map the shared memory region |
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*/ |
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const char* shm_key = getenv("SHM_ID"); |
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if (!shm_key) { |
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puts("[COV] no shared memory bitmap available, skipping"); |
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__shmem = (struct shmem_data*) malloc(SHM_SIZE); |
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} else { |
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int fd = shm_open(shm_key, O_RDWR, S_IREAD | S_IWRITE); |
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if (fd <= -1) { |
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fprintf(stderr, "Failed to open shared memory region: %s\n", strerror(errno)); |
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_exit(-1); |
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} |
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__shmem = (struct shmem_data*) mmap(0, SHM_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); |
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if (__shmem == MAP_FAILED) { |
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fprintf(stderr, "Failed to mmap shared memory region\n"); |
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_exit(-1); |
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} |
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} |
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__sanitizer_cov_reset_edgeguards(); |
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__shmem->num_edges = stop - start; |
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printf("[COV] edge counters initialized. Shared memory: %s with %u edges\n", shm_key, __shmem->num_edges); |
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} |
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void __sanitizer_cov_trace_pc_guard(duk_uint32_t *guard) { |
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/* There's a small race condition here: if this function executes in two threads for the same
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* edge at the same time, the first thread might disable the edge (by setting the guard to zero) |
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* before the second thread fetches the guard value (and thus the index). However, our |
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* instrumentation ignores the first edge (see libcoverage.c) and so the race is unproblematic. |
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*/ |
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duk_uint32_t index = *guard; |
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/*
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* If this function is called before coverage instrumentation is properly initialized we want to return early. |
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*/ |
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if (!index) return; |
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__shmem->edges[index / 8] |= 1 << (index % 8); |
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*guard = 0; |
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} |
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#endif /* DUK_USE_FUZZILLI */ |
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/*
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* Main |
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*/ |
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@ -1296,6 +1466,9 @@ int main(int argc, const char *argv[]) { |
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int run_stdin = 0; |
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const char *compile_filename = NULL; |
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int i; |
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#if defined(DUK_USE_FUZZILLI) |
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int reprl_mode = 0; |
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#endif /* DUK_USE_FUZZILLI */ |
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main_argc = argc; |
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main_argv = (const char **) argv; |
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@ -1410,7 +1583,11 @@ int main(int argc, const char *argv[]) { |
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} else if (strcmp(arg, "--reattach") == 0) { |
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debugger_reattach = 1; |
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#endif |
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} else if (strcmp(arg, "--recreate-heap") == 0) { |
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#if defined(DUK_USE_FUZZILLI) |
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} else if (strcmp(arg, "--reprl") == 0) { |
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reprl_mode = 1; |
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#endif |
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} else if (strcmp(arg, "--recreate-heap") == 0) { |
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recreate_heap = 1; |
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} else if (strcmp(arg, "--no-heap-destroy") == 0) { |
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no_heap_destroy = 1; |
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@ -1502,7 +1679,75 @@ int main(int argc, const char *argv[]) { |
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} |
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} |
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if (run_stdin) { |
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#if defined(DUK_USE_FUZZILLI) |
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/* Run the fuzzilli run-eval-print-repeat loop, and exit at the end*/ |
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if(reprl_mode){ |
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/* REPRL: let parent know we are ready */ |
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char helo[4] = "HELO"; |
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if (write(REPRL_CWFD, helo, 4) != 4 || |
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read(REPRL_CRFD, helo, 4) != 4) { |
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reprl_mode = 0; |
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} |
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if (memcmp(helo, "HELO", 4) != 0) { |
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fprintf(stderr, "Invalid response from parent\n"); |
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_exit(-1); |
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} |
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while(reprl_mode) { |
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unsigned action = 0; |
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duk_int64_t nread = read(REPRL_CRFD, &action, 4); |
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if (nread != 4 || action != 'cexe') { |
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fprintf(stderr, "Unknown action: %u\n", action); |
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duk_assert_wrapper(0); |
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_exit(-1); |
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} |
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duk_size_t script_size; |
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duk_assert_wrapper(read(REPRL_CRFD, &script_size, 8) == 8); |
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char static_buff[4096]; |
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char * buffer; |
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/* In practice, we're never going to get to 4k long input scripts (21 core days got to ~80 bytes) */ |
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if(script_size > 4095) { |
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buffer = (char *) malloc((sizeof(char) * (script_size + 1))); |
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}else{ |
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buffer = static_buff; |
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} |
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char *ptr = buffer; |
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duk_size_t remaining = script_size; |
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while (remaining > 0) { |
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duk_int64_t rv = read(REPRL_DRFD, ptr, remaining); |
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duk_assert_wrapper(rv >= 0); |
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remaining -= rv; |
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ptr += rv; |
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} |
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buffer[script_size] = 0; |
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/* Actually execute */ |
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duk_push_string(ctx, buffer); |
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duk_int_t rc = duk_peval(ctx); |
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/* Return result to parent */ |
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rc <<= 8; |
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duk_assert_wrapper(write(REPRL_CWFD, &rc, 4) == 4); |
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/* Clean up this round */ |
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if(script_size > 4095) { |
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free(buffer); |
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} |
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duk_destroy_heap(ctx); |
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ctx = create_duktape_heap(alloc_provider, debugger, lowmem_log); |
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__sanitizer_cov_reset_edgeguards(); |
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} |
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return 0; |
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} |
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#endif |
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if (run_stdin) { |
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/* Running stdin like a full file (reading all lines before
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* compiling) is useful with emduk: |
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* cat test.js | ./emduk --run-stdin |
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Sami Vaarala
4 years ago
GitHub