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commit 253d3194c2b58152fe830fd27c2fd83ebc6fe5ee upstream. Some architectures (e.g. arm64) can have heterogeneous CPUs, and the boot CPU may be able to provide entropy while secondary CPUs cannot. On such systems, arch_get_random_long() and arch_get_random_seed_long() will fail unless support for RNG instructions has been detected on all CPUs. This prevents the boot CPU from being able to provide (potentially) trusted entropy when seeding the primary CRNG. To make it possible to seed the primary CRNG from the boot CPU without adversely affecting the runtime versions of arch_get_random_long() and arch_get_random_seed_long(), this patch adds new early versions of the functions used when initializing the primary CRNG. Default implementations are provided atop of the existing arch_get_random_long() and arch_get_random_seed_long() so that only architectures with such constraints need to provide the new helpers. There should be no functional change as a result of this patch. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Cc: Mark Brown <broonie@kernel.org> Cc: Theodore Ts'o <tytso@mit.edu> Link: https://lore.kernel.org/r/20200210130015.17664-3-mark.rutland@arm.com Signed-off-by: Theodore Ts'o <tytso@mit.edu> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
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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.