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If the alternate signal stack is protected by a different PKEY than the current execution stack, copying XSAVE data to the sigaltstack will fail if its PKEY is not enabled in the PKRU register. It's unknown which pkey was used by the application for the altstack, so enable all PKEYS before XSAVE. But this updated PKRU value is also pushed onto the sigframe, which means the register value restored from sigcontext will be different from the user-defined one, which is incorrect. Fix that by overwriting the PKRU value on the sigframe with the original, user-defined PKRU. Signed-off-by: Aruna Ramakrishna <aruna.ramakrishna@oracle.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lore.kernel.org/all/20240802061318.2140081-4-aruna.ramakrishna@oracle.com
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.