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Will Deacon a454483137 arm64: fpsimd: Fix copying of FP state from signal frame into task struct Commit `9de52a755c` ("arm64: fpsimd: Fix failure to restore FPSIMD state after signals") fixed an issue reported in our FPSIMD signal restore code but inadvertently introduced another issue which tends to manifest as random SEGVs in userspace. The problem is that when we copy the struct fpsimd_state from the kernel stack (populated from the signal frame) into the struct held in the current thread_struct, we blindly copy uninitialised stack into the "cpu" field, which means that context-switching of the FP registers is no longer reliable. This patch fixes the problem by copying only the user_fpsimd member of struct fpsimd_state. We should really rework the function prototypes to take struct user_fpsimd_state * instead, but let's just get this fixed for now. Cc: Dave Martin <Dave.Martin@arm.com> Fixes: `9de52a755c` ("arm64: fpsimd: Fix failure to restore FPSIMD state after signals") Reported-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Will Deacon <will.deacon@arm.com>		2017-12-15 16:12:35 +00:00
arch	arm64: fpsimd: Fix copying of FP state from signal frame into task struct	2017-12-15 16:12:35 +00:00
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Documentation	arm64: Add software workaround for Falkor erratum 1041	2017-12-12 11:45:19 +00:00
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fs	hpfs: don't bother with the i_version counter or f_version	2017-12-10 12:58:18 -08:00
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kernel	futex: futex_wake_op, fix sign_extend32 sign bits	2017-12-10 12:50:57 -08:00
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Makefile	Linux 4.15-rc3	2017-12-10 17:56:26 -08:00
README

README

Linux kernel
============

This file was moved to Documentation/admin-guide/README.rst

Please notice that there are several guides for kernel developers and users.
These guides can be rendered in a number of formats, like HTML and PDF.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.

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.