diff options
Diffstat (limited to 'examples/afl_proxy')
| -rw-r--r-- | examples/afl_proxy/Makefile | 7 | ||||
| -rw-r--r-- | examples/afl_proxy/README.md | 9 | ||||
| -rw-r--r-- | examples/afl_proxy/afl-proxy.c | 238 |
3 files changed, 0 insertions, 254 deletions
diff --git a/examples/afl_proxy/Makefile b/examples/afl_proxy/Makefile deleted file mode 100644 index 4b368f8d..00000000 --- a/examples/afl_proxy/Makefile +++ /dev/null @@ -1,7 +0,0 @@ -all: afl-proxy - -afl-proxy: afl-proxy.c - $(CC) -I../../include -o afl-proxy afl-proxy.c - -clean: - rm -f afl-proxy *~ core diff --git a/examples/afl_proxy/README.md b/examples/afl_proxy/README.md deleted file mode 100644 index 3c768a19..00000000 --- a/examples/afl_proxy/README.md +++ /dev/null @@ -1,9 +0,0 @@ -# afl-proxy - -afl-proxy is an example skeleton file which can easily be used to fuzz -and instrument non-standard things. - -You only need to change the while() loop of the main() to send the -data of buf[] with length len to the target and write the coverage -information to __afl_area_ptr[__afl_map_size] - diff --git a/examples/afl_proxy/afl-proxy.c b/examples/afl_proxy/afl-proxy.c deleted file mode 100644 index f2dfeac1..00000000 --- a/examples/afl_proxy/afl-proxy.c +++ /dev/null @@ -1,238 +0,0 @@ -/* - american fuzzy lop++ - afl-proxy skeleton example - --------------------------------------------------- - - Written by Marc Heuse <mh@mh-sec.de> - - Copyright 2019-2020 AFLplusplus Project. 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 - - - HOW-TO - ====== - - You only need to change the while() loop of the main() to send the - data of buf[] with length len to the target and write the coverage - information to __afl_area_ptr[__afl_map_size] - - -*/ - -#ifdef __ANDROID__ - #include "android-ashmem.h" -#endif -#include "config.h" -#include "types.h" - -#include <stdio.h> -#include <stdlib.h> -#include <signal.h> -#include <unistd.h> -#include <string.h> -#include <assert.h> -#include <stdint.h> -#include <errno.h> - -#include <sys/mman.h> -#include <sys/shm.h> -#include <sys/wait.h> -#include <sys/types.h> -#include <fcntl.h> - -u8 *__afl_area_ptr; - -#ifdef __ANDROID__ -u32 __afl_map_size = MAP_SIZE; -#else -__thread u32 __afl_map_size = MAP_SIZE; -#endif - -/* Error reporting to forkserver controller */ - -void send_forkserver_error(int error) { - - u32 status; - if (!error || error > 0xffff) return; - status = (FS_OPT_ERROR | FS_OPT_SET_ERROR(error)); - if (write(FORKSRV_FD + 1, (char *)&status, 4) != 4) return; - -} - -/* SHM setup. */ - -static void __afl_map_shm(void) { - - char *id_str = getenv(SHM_ENV_VAR); - char *ptr; - - if ((ptr = getenv("AFL_MAP_SIZE")) != NULL) { - - u32 val = atoi(ptr); - if (val > 0) __afl_map_size = val; - - } - - if (__afl_map_size > MAP_SIZE) { - - if (__afl_map_size > FS_OPT_MAX_MAPSIZE) { - - fprintf(stderr, - "Error: AFL++ tools *require* to set AFL_MAP_SIZE to %u to " - "be able to run this instrumented program!\n", - __afl_map_size); - if (id_str) { - - send_forkserver_error(FS_ERROR_MAP_SIZE); - exit(-1); - - } - - } else { - - fprintf(stderr, - "Warning: AFL++ tools will need to set AFL_MAP_SIZE to %u to " - "be able to run this instrumented program!\n", - __afl_map_size); - - } - - } - - if (id_str) { - -#ifdef USEMMAP - const char * shm_file_path = id_str; - int shm_fd = -1; - unsigned char *shm_base = NULL; - - /* create the shared memory segment as if it was a file */ - shm_fd = shm_open(shm_file_path, O_RDWR, 0600); - if (shm_fd == -1) { - - fprintf(stderr, "shm_open() failed\n"); - send_forkserver_error(FS_ERROR_SHM_OPEN); - exit(1); - - } - - /* map the shared memory segment to the address space of the process */ - shm_base = - mmap(0, __afl_map_size, PROT_READ | PROT_WRITE, MAP_SHARED, shm_fd, 0); - - if (shm_base == MAP_FAILED) { - - close(shm_fd); - shm_fd = -1; - - fprintf(stderr, "mmap() failed\n"); - send_forkserver_error(FS_ERROR_MMAP); - exit(2); - - } - - __afl_area_ptr = shm_base; -#else - u32 shm_id = atoi(id_str); - - __afl_area_ptr = shmat(shm_id, 0, 0); - -#endif - - if (__afl_area_ptr == (void *)-1) { - - send_forkserver_error(FS_ERROR_SHMAT); - exit(1); - - } - - /* Write something into the bitmap so that the parent doesn't give up */ - - __afl_area_ptr[0] = 1; - - } - -} - -/* Fork server logic. */ - -static void __afl_start_forkserver(void) { - - u8 tmp[4] = {0, 0, 0, 0}; - u32 status = 0; - - if (__afl_map_size <= FS_OPT_MAX_MAPSIZE) - status |= (FS_OPT_SET_MAPSIZE(__afl_map_size) | FS_OPT_MAPSIZE); - if (status) status |= (FS_OPT_ENABLED); - memcpy(tmp, &status, 4); - - /* Phone home and tell the parent that we're OK. */ - - if (write(FORKSRV_FD + 1, tmp, 4) != 4) return; - -} - -static u32 __afl_next_testcase(u8 *buf, u32 max_len) { - - s32 status, res = 0xffffff; - - /* Wait for parent by reading from the pipe. Abort if read fails. */ - if (read(FORKSRV_FD, &status, 4) != 4) return 0; - - /* we have a testcase - read it */ - status = read(0, buf, max_len); - - /* report that we are starting the target */ - if (write(FORKSRV_FD + 1, &res, 4) != 4) return 0; - - if (status < 1) - return 0; - else - return status; - -} - -static void __afl_end_testcase(void) { - - int status = 0xffffff; - - if (write(FORKSRV_FD + 1, &status, 4) != 4) exit(1); - -} - -/* you just need to modify the while() loop in this main() */ - -int main(int argc, char *argv[]) { - - /* This is were the testcase data is written into */ - u8 buf[1024]; // this is the maximum size for a test case! set it! - u32 len; - - /* here you specify the map size you need that you are reporting to - afl-fuzz. */ - __afl_map_size = MAP_SIZE; // default is 65536 - - /* then we initialize the shared memory map and start the forkserver */ - __afl_map_shm(); - __afl_start_forkserver(); - - while ((len = __afl_next_testcase(buf, sizeof(buf))) > 0) { - - /* here you have to create the magic that feeds the buf/len to the - target and write the coverage to __afl_area_ptr */ - - // ... the magic ... - - /* report the test case is done and wait for the next */ - __afl_end_testcase(); - - } - - return 0; - -} - |