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Kees Cook fa35198f39 fortify: Explicitly check bounds are compile-time constants
In preparation for replacing __builtin_object_size() with
__builtin_dynamic_object_size(), all the compile-time size checks
need to check that the bounds comparisons are, in fact, known at
compile-time. Enforce what was guaranteed with __bos(). In other words,
since all uses of __bos() were constant expressions, it was not required
to test for this. When these change to __bdos(), they _may_ be constant
expressions, and the checks are only valid when the prior condition
holds. This results in no binary differences.

Cc: linux-hardening@vger.kernel.org
Link: https://lore.kernel.org/lkml/20220920192202.190793-3-keescook@chromium.org
Signed-off-by: Kees Cook <keescook@chromium.org>
History 2022-09-26 11:01:32 -07:00
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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 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.