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Ard Biesheuvel 74d613e046 efi/libstub: Avoid CopyMem/SetMem EFI services after ExitBootServices
Given that memset/memcpy are intrinsics, the compiler might insert calls
to these routines unexpectedly, including in code that executes after
ExitBootServices(). In this case, the respective boot services are no
longer accessible, and calling them will cause a crash.

So fall back to a bytewise copy/store if this happens to occur, even
though no such occurrences are known to exist in the kernel currently.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
History 2025-03-13 11:52:05 +01:00
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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 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.