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| Filename | Latest commit message | Latest commit date |
|---|---|---|
86df072c74
[ Upstream commit 0b91fda3a1f044141e1e615456ff62508c32b202 ]
Prior to this patch, the mark is sanitized (applying the state's mask to
the state's value) only on inserts when checking if a conflicting XFRM
state or policy exists.
We discovered in Cilium that this same sanitization does not occur
in the hot-path __xfrm_state_lookup. In the hot-path, the sk_buff's mark
is simply compared to the state's value:
if ((mark & x->mark.m) != x->mark.v)
continue;
Therefore, users can define unsanitized marks (ex. 0xf42/0xf00) which will
never match any packet.
This commit updates __xfrm_state_insert and xfrm_policy_insert to store
the sanitized marks, thus removing this footgun.
This has the side effect of changing the ip output, as the
returned mark will have the mask applied to it when printed.
Fixes:
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| include | ||
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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 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.