| commit | 3afda967bc78d227b521d945f2ade2475974f1dc | [log] [tgz] |
|---|---|---|
| author | Pierre-Clément Tosi <ptosi@google.com> | Tue Jul 26 15:59:06 2022 +0100 |
| committer | Pierre-Clément Tosi <ptosi@google.com> | Fri Sep 09 15:34:14 2022 +0100 |
| tree | a90a896f90ab14aaafb169210ee770e75230e1c2 | |
| parent | f500e27127cc8f2e9345fceedf2cef604eb38c9d [diff] |
ANDROID: fuzz: Only check valid phandles Ignore invalid phandles from fdt_get_phandle(). Update the assert() to avoid false positives, as per the libfdt API: ``` * fdt_node_offset_by_phandle() returns the offset of the node * which has the given phandle value. If there is more than one node * in the tree with the given phandle (an invalid tree), results are * undefined. ``` Bug: 240612647 Test: SANITIZE_HOST=address m libfdt_fuzzer Signed-off-by: Pierre-Clément Tosi <ptosi@google.com> Change-Id: Ifbb6a25ab6bd1463afccc88f9756d34c3cf59717
The source tree contains the Device Tree Compiler (dtc) toolchain for working with device tree source and binary files and also libfdt, a utility library for reading and manipulating the binary format.
dtc and libfdt are maintained by:
A Python library wrapping libfdt is also available. To build this you will need to install swig and Python development files. On Debian distributions:
$ sudo apt-get install swig python3-dev
The library provides an Fdt class which you can use like this:
$ PYTHONPATH=../pylibfdt python3
>>> import libfdt
>>> fdt = libfdt.Fdt(open('test_tree1.dtb', mode='rb').read())
>>> node = fdt.path_offset('/subnode@1')
>>> print(node)
124
>>> prop_offset = fdt.first_property_offset(node)
>>> prop = fdt.get_property_by_offset(prop_offset)
>>> print('%s=%s' % (prop.name, prop.as_str()))
compatible=subnode1
>>> node2 = fdt.path_offset('/')
>>> print(fdt.getprop(node2, 'compatible').as_str())
test_tree1
You will find tests in tests/pylibfdt_tests.py showing how to use each method. Help is available using the Python help command, e.g.:
$ cd pylibfdt $ python3 -c "import libfdt; help(libfdt)"
If you add new features, please check code coverage:
$ sudo apt-get install python3-coverage $ cd tests # It's just 'coverage' on most other distributions $ python3-coverage run pylibfdt_tests.py $ python3-coverage html # Open 'htmlcov/index.html' in your browser
The library can be installed with pip from a local source tree:
$ pip install . [--user|--prefix=/path/to/install_dir]
Or directly from a remote git repo:
$ pip install git+git://git.kernel.org/pub/scm/utils/dtc/dtc.git@main
The install depends on libfdt shared library being installed on the host system first. Generally, using --user or --prefix is not necessary and pip will use the default location for the Python installation which varies if the user is root or not.
You can also install everything via make if you like, but pip is recommended.
To install both libfdt and pylibfdt you can use:
$ make install [PREFIX=/path/to/install_dir]
To disable building the python library, even if swig and Python are available, use:
$ make NO_PYTHON=1
More work remains to support all of libfdt, including access to numeric values.