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When passing pointer to some map value to kfunc or global func, in verifier we are passing meta as NULL to various functions, which uses meta->raw_mode to check whether memory is being written to. Since some kfunc or global funcs may also write to memory pointers they receive as arguments, we must check for write access to memory. E.g. in some case map may be read only and this will be missed by current checks. However meta->raw_mode allows for uninitialized memory (e.g. on stack), since there is not enough info available through BTF, we must perform one call for read access (raw_mode = false), and one for write access (raw_mode = true). Fixes:e5069b9c23("bpf: Support pointers in global func args") Fixes:d583691c47("bpf: Introduce mem, size argument pair support for kfunc") Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com> Link: https://lore.kernel.org/r/20220319080827.73251-2-memxor@gmail.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.