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All crypto API algorithms are supposed to support the case where they are called in a context where SIMD instructions are unusable, e.g. IRQ context on some architectures. However, this isn't tested for by the self-tests, causing bugs to go undetected. Now that all algorithms have been converted to use crypto_simd_usable(), update the self-tests to test the no-SIMD case. First, a bool testvec_config::nosimd is added. When set, the crypto operation is executed with preemption disabled and with crypto_simd_usable() mocked out to return false on the current CPU. A bool test_sg_division::nosimd is also added. For hash algorithms it's honored by the corresponding ->update(). By setting just a subset of these bools, the case where some ->update()s are done in SIMD context and some are done in no-SIMD context is also tested. These bools are then randomly set by generate_random_testvec_config(). For now, all no-SIMD testing is limited to the extra crypto self-tests, because it might be a bit too invasive for the regular self-tests. But this could be changed later. This has already found bugs in the arm64 AES-GCM and ChaCha algorithms. This would have found some past bugs as well. Signed-off-by: Eric Biggers <ebiggers@google.com> Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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.