linux-kernel - [PATCH v2 0/2] x86/FPU: FPU sanitization for in-kernel use

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Message-Id: <20200624114646.28953-1-bp@alien8.de>
Date:   Wed, 24 Jun 2020 13:46:44 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     X86 ML <x86@...nel.org>
Cc:     Andy Lutomirski <luto@...capital.net>,
        Dave Hansen <dave.hansen@...el.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Petteri Aimonen <jpa@...nelbug.mail.kapsi.fi>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH v2 0/2] x86/FPU: FPU sanitization for in-kernel use

From: Borislav Petkov <bp@...e.de>

Ok,

here's v2 with build fixes and other review comments addressed.

Thx.

Changelog:
----------

v1:
==

Hi all,

here's a proper submission of the work started by Petteri. I think I've
addressed all the feedback so far. I've added the preparation work for
the test to run, to a script run_test_fpu.sh which does some basic
checks, loads the module and runs the test for 1000 times on all CPUs,
by default. Thought this is a sane default, feel free to prove me wrong
and I'll change it.

Thx.

Petteri Aimonen (2):
  x86/fpu: Reset MXCSR to default in kernel_fpu_begin()
  selftests/fpu: Add an FPU selftest

 arch/x86/include/asm/fpu/internal.h         |  5 ++
 arch/x86/kernel/fpu/core.c                  |  6 ++
 lib/Kconfig.debug                           | 11 +++
 lib/Makefile                                | 24 ++++++
 lib/test_fpu.c                              | 89 +++++++++++++++++++++
 tools/testing/selftests/Makefile            |  1 +
 tools/testing/selftests/fpu/.gitignore      |  2 +
 tools/testing/selftests/fpu/Makefile        |  9 +++
 tools/testing/selftests/fpu/run_test_fpu.sh | 46 +++++++++++
 tools/testing/selftests/fpu/test_fpu.c      | 61 ++++++++++++++
 10 files changed, 254 insertions(+)
 create mode 100644 lib/test_fpu.c
 create mode 100644 tools/testing/selftests/fpu/.gitignore
 create mode 100644 tools/testing/selftests/fpu/Makefile
 create mode 100755 tools/testing/selftests/fpu/run_test_fpu.sh
 create mode 100644 tools/testing/selftests/fpu/test_fpu.c

-- 
2.21.0