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Mykyta Yatsenko says:
====================
Introduce kfuncs for memory reads into dynptrs
From: Mykyta Yatsenko <yatsenko@meta.com>
This patch adds new kfuncs that enable reading variable-length
user or kernel data directly into dynptrs.
These kfuncs provide a way to perform dynamically-sized reads
while maintaining memory safety. Unlike existing
`bpf_probe_read_{user|kernel}` APIs, which are limited to constant-sized
reads, these new kfuncs allow for more flexible data access.
v4 -> v5
* Fix pointers annotations, use __user where necessary, cast where needed
v3 -> v4
* Added pid filtering in selftests
v2 -> v3
* Add KF_TRUSTED_ARGS for kfuncs that take pointer to task_struct
as an argument
* Remove checks for non-NULL task, where it was not necessary
* Added comments on constants used in selftests, etc.
v1 -> v2
* Renaming helper functions to use "user_str" instead of "user_data_str"
suffix
====================
Link: https://patch.msgid.link/20250512205348.191079-1-mykyta.yatsenko5@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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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 reStructuredText 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.