diff options
| -rw-r--r-- | utils/argv_fuzzing/Makefile | 8 | ||||
| -rw-r--r-- | utils/argv_fuzzing/README.md | 15 |
2 files changed, 14 insertions, 9 deletions
diff --git a/utils/argv_fuzzing/Makefile b/utils/argv_fuzzing/Makefile index 3ebde54b..fca46b09 100644 --- a/utils/argv_fuzzing/Makefile +++ b/utils/argv_fuzzing/Makefile @@ -11,7 +11,7 @@ # http://www.apache.org/licenses/LICENSE-2.0 # -.PHONY: all install clean +.PHONY: all install clean demo PREFIX ?= /usr/local BIN_PATH = $(PREFIX)/bin @@ -58,5 +58,7 @@ clean: rm -f argvfuzz32.so argvfuzz64.so argv_fuzz_demo argv_fuzz_persistent_demo demo: - ../../afl-clang-fast -o argv_fuzz_demo argv_fuzz_demo.c - ../../afl-clang-fast -o argv_fuzz_persistent_demo argv_fuzz_persistent_demo.c \ No newline at end of file + CC = afl-clang-fast + CFLAGS = -fsanitize=address + -@$(CC) $(CFLAGS) -o argv_fuzz_demo argv_fuzz_demo.c + -@$(CC) $(CFLAGS) -o argv_fuzz_persistent_demo argv_fuzz_persistent_demo.c \ No newline at end of file diff --git a/utils/argv_fuzzing/README.md b/utils/argv_fuzzing/README.md index e22fbe4e..d248cf93 100644 --- a/utils/argv_fuzzing/README.md +++ b/utils/argv_fuzzing/README.md @@ -1,14 +1,16 @@ # argv_fuzzing feature -AFL++ supports fuzzing file inputs or stdin. The argv_fuzzing feature allows for fuzzing of arguments passed to a program from the command line interface, rather than from standard input. +AFL++ supports fuzzing file inputs or stdin. The argv_fuzzing feature allows for the fuzzing of arguments +passed to a program from the command line interface rather than from standard input. ## With source code -When source is available, a macro from the `argv-fuzz-inl.h` header file can be used to change the program's behavior to build argv from STDIN. +When the source code is available, a specific macro from the `argv-fuzz-inl.h` header file can be used to change +the program's behavior to build argv from STDIN. ### Without persistent mode Conditions needed to use the argv_fuzzing feature: 1. Include `argv-fuzz-inl.h` header file (`#include "argv-fuzz-inl.h"`) 2. Identify your main function that parses arguments (for example, `int main(int argc, char **argv)`) -3. Use the one of the following macros (near the beginning of the main function) to initialize argv with the fuzzer's input: +3. Use one of the following macros (near the beginning of the main function) to initialize argv with the fuzzer's input: - `AFL_INIT_ARGV();` or - `AFL_INIT_SET0("prog_name");` to preserve `argv[0]` (the name of the program being executed) @@ -18,7 +20,8 @@ see: [argv_fuzz_demo.c](argv_fuzz_demo.c) Conditions needed to use the argv_fuzzing feature with persistent mode: 1. Ensure your target can handle persistent mode fuzzing 2. Follow instructions in the [llvm_mode persistent mode](https://github.com/AFLplusplus/AFLplusplus/blob/stable/instrumentation/README.persistent_mode.md) -3. Use the one of the following macro near the beginning of the main function and after the buffer initialization (`unsigned char *buf = __AFL_FUZZ_TESTCASE_BUF`): +3. Use one of the following macros near the beginning of the main function and after +the buffer initialization (`unsigned char *buf = __AFL_FUZZ_TESTCASE_BUF`): - `AFL_INIT_ARGV_PERSISTENT(buf)`, if you want to - `AFL_INIT_SET0_PERSISTENT("name_of_binary", buf)` @@ -34,5 +37,5 @@ A few conditions need to be fulfilled for this mechanism to work correctly: 1. As it relies on hooking the loader, it cannot work on static binaries 2. If the target binary does not use the default libc's `_start` implementation (crt1.o), the hook may not run. -3. The hook will replace argv with pointers to `.data` of `argvfuzz.so`. If the - target binary expects argv to be living on the stack, things may go wrong. +3. The hook will replace argv with pointers to `.data` of `argvfuzz.so`. +Things may go wrong if the target binary expects argv to live on the stack. |