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Jakub Sitnicki be83105d38 bpf: Make bpf_skb_adjust_room metadata-safe
bpf_skb_adjust_room() may push or pull bytes from skb->data. In both cases,
skb metadata must be moved accordingly to stay accessible.

Replace existing memmove() calls, which only move payload, with a helper
that also handles metadata. Reserve enough space for metadata to fit after
skb_push.

Signed-off-by: Jakub Sitnicki <jakub@cloudflare.com>
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://patch.msgid.link/20251105-skb-meta-rx-path-v4-7-5ceb08a9b37b@cloudflare.com
History 2025-11-10 10:52:32 -08:00
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README

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.