| commit | 3c28f3e3a1724c288d19f1b1a139cf57bfe1af33 | [log] [tgz] |
|---|---|---|
| author | Pierre-Clément Tosi <ptosi@google.com> | Tue Sep 13 16:58:15 2022 +0100 |
| committer | Pierre-Clément Tosi <ptosi@google.com> | Wed Sep 14 14:58:36 2022 +0100 |
| tree | c1b128eabf80616a9f45ece7518acf5b4ec96738 | |
| parent | cca1ca7b21869b05b334cd81590c9cdf804c8e4a [diff] |
libfdt: fdt_path_offset_namelen: Reject empty paths Make empty paths result in FDT_ERR_BADPATH. Per the specification (v0.4-rc4): > The convention for specifying a device path is: > /node-name-1/node-name-2/node-name-N > > The path to the root node is /. > > A unit address may be omitted if the full path to the > node is unambiguous. Bug: 246465319 Test: libfdt_fuzzer # clusterfuzz/testcase-detail/4530863420604416 Change-Id: I14ab0a074ab994c1f598243d2d5795d2cd9a853a
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.