You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
44 lines
1.8 KiB
44 lines
1.8 KiB
================
|
|
AFL dictionaries
|
|
================
|
|
|
|
(See ../docs/README for the general instruction manual.)
|
|
|
|
This subdirectory contains a set of dictionaries that can be used in
|
|
conjunction with the -x option to allow the fuzzer to effortlessly explore the
|
|
grammar of some of the more verbose data formats or languages. The basic
|
|
principle behind the operation of fuzzer dictionaries is outlined in section 9
|
|
of the "main" README for the project.
|
|
|
|
Custom dictionaries can be added at will. They should consist of a
|
|
reasonably-sized set of rudimentary syntax units that the fuzzer will then try
|
|
to clobber together in various ways. Snippets between 2 and 16 bytes are usually
|
|
the sweet spot.
|
|
|
|
Custom dictionaries can be created in two ways:
|
|
|
|
- By creating a new directory and placing each token in a separate file, in
|
|
which case, there is no need to escape or otherwise format the data.
|
|
|
|
- By creating a flat text file where tokens are listed one per line in the
|
|
format of name="value". The alphanumeric name is ignored and can be omitted,
|
|
although it is a convenient way to document the meaning of a particular
|
|
token. The value must appear in quotes, with hex escaping (\xNN) applied to
|
|
all non-printable, high-bit, or otherwise problematic characters (\\ and \"
|
|
shorthands are recognized, too).
|
|
|
|
The fuzzer auto-selects the appropriate mode depending on whether the -x
|
|
parameter is a file or a directory.
|
|
|
|
In the file mode, every name field can be optionally followed by @<num>, e.g.:
|
|
|
|
keyword_foo@1 = "foo"
|
|
|
|
Such entries will be loaded only if the requested dictionary level is equal or
|
|
higher than this number. The default level is zero; a higher value can be set
|
|
by appending @<num> to the dictionary file name, like so:
|
|
|
|
-x path/to/dictionary.dct@2
|
|
|
|
Good examples of dictionaries can be found in xml.dict and png.dict.
|