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authorvanhauser-thc <vh@thc.org>2020-12-01 14:40:30 +0100
committervanhauser-thc <vh@thc.org>2020-12-01 14:40:30 +0100
commitc05e4efbe9b4e7d1ff078b7a392621f2ca7572e6 (patch)
treee005593b09169435cbad53c9990c6485e8fd9d06 /examples/argv_fuzzing/README.md
parent8584f9d2b5de9687c518c672e471f4f8cd9166fa (diff)
downloadafl++-c05e4efbe9b4e7d1ff078b7a392621f2ca7572e6.tar.gz
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-# argvfuzz
-
-afl supports fuzzing file inputs or stdin. When source is available,
-`argv-fuzz-inl.h` can be used to change `main()` to build argv from stdin.
-
-`argvfuzz` tries to provide the same functionality for binaries. When loaded
-using `LD_PRELOAD`, it will hook the call to `__libc_start_main` and replace
-argv using the same logic of `argv-fuzz-inl.h`.
-
-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.