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John Fastabend says: ==================== This series adds logic to the verifier to handle the case where a pointer is known to be non-null but then the verifier encountesr a instruction, such as 'if ptr == 0 goto X' or 'if ptr != 0 goto X', where the pointer is compared against 0. Because the verifier tracks if a pointer may be null in many cases we can improve the branch tracking by following the case known to be true. The first patch adds the verifier logic and patches 2-4 add the test cases. v1->v2: fix verifier logic to return -1 indicating both paths must still be walked if value is not zero. Move mark_precision skip for this case into caller of mark_precision to ensure mark_precision can still catch other misuses. And add PTR_TYPE_BTF_ID to our list of supported types. Finally add one more test to catch the value not equal zero case. Thanks to Andrii for original review. Also fixed up commit messages hopefully its better now. ==================== Acked-by: Andrii Nakryiko <andriin@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.