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Kees Cook 9f25b1fb1c compiler.h: Introduce __must_be_noncstr() 
In preparation for adding more type checking to the memtostr/strtomem*()
helpers, introduce the ability to check for the "nonstring" attribute.
This is the reverse of what was added to strscpy*() in commit 559048d156
("string: Check for "nonstring" attribute on strscpy() arguments").

Note that __annotated() must be explicitly tested for, as GCC added
__builtin_has_attribute() after it added the "nonstring" attribute. Do
so here to avoid the !__annotated() test triggering build failures
when __builtin_has_attribute() was missing but __nonstring was defined.
(I've opted to squash this fix into this patch so we don't end up with
a possible bisection target that would leave the kernel unbuildable.)

Reported-by: Venkat Rao Bagalkote <venkat88@linux.vnet.ibm.com>
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Reported-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Reported-by: Michael Kelley <mhklinux@outlook.com>
Closes: https://lore.kernel.org/all/adbe8dd1-a725-4811-ae7e-76fe770cf096@linux.vnet.ibm.com/
Tested-by: Michael Kelley <mhklinux@outlook.com>
Signed-off-by: Kees Cook <kees@kernel.org>
History 2025-03-03 09:35:44 -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.