2018-01-06 14:13:39 +00:00
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From 9b2405a12593b1ba7894cf249ddeada92a658463 Mon Sep 17 00:00:00 2001
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From: Andi Kleen <ak@linux.intel.com>
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Date: Fri, 13 Oct 2017 14:56:45 -0700
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2018-01-08 10:50:09 +00:00
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Subject: [PATCH 069/242] x86/fpu: Remove the explicit clearing of XSAVE
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2018-01-06 14:13:39 +00:00
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dependent features
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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CVE-2017-5754
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Clearing a CPU feature with setup_clear_cpu_cap() clears all features
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which depend on it. Expressing feature dependencies in one place is
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easier to maintain than keeping functions like
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fpu__xstate_clear_all_cpu_caps() up to date.
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The features which depend on XSAVE have their dependency expressed in the
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dependency table, so its sufficient to clear X86_FEATURE_XSAVE.
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Remove the explicit clearing of XSAVE dependent features.
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Signed-off-by: Andi Kleen <ak@linux.intel.com>
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Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
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Cc: Linus Torvalds <torvalds@linux-foundation.org>
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Cc: Peter Zijlstra <peterz@infradead.org>
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Link: http://lkml.kernel.org/r/20171013215645.23166-6-andi@firstfloor.org
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Signed-off-by: Ingo Molnar <mingo@kernel.org>
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(cherry picked from commit 73e3a7d2a7c3be29a5a22b85026f6cfa5664267f)
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Signed-off-by: Andy Whitcroft <apw@canonical.com>
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Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>
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(cherry picked from commit af445f9ba8bb30b47ccb5247b8f5ba28c9f2be3e)
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Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
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---
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arch/x86/kernel/fpu/xstate.c | 20 --------------------
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1 file changed, 20 deletions(-)
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diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c
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index 3abe85b08234..fd6882c42246 100644
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--- a/arch/x86/kernel/fpu/xstate.c
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+++ b/arch/x86/kernel/fpu/xstate.c
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@@ -73,26 +73,6 @@ unsigned int fpu_user_xstate_size;
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void fpu__xstate_clear_all_cpu_caps(void)
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{
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setup_clear_cpu_cap(X86_FEATURE_XSAVE);
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- setup_clear_cpu_cap(X86_FEATURE_XSAVEOPT);
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- setup_clear_cpu_cap(X86_FEATURE_XSAVEC);
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- setup_clear_cpu_cap(X86_FEATURE_XSAVES);
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- setup_clear_cpu_cap(X86_FEATURE_AVX);
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- setup_clear_cpu_cap(X86_FEATURE_AVX2);
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- setup_clear_cpu_cap(X86_FEATURE_AVX512F);
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- setup_clear_cpu_cap(X86_FEATURE_AVX512IFMA);
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- setup_clear_cpu_cap(X86_FEATURE_AVX512PF);
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- setup_clear_cpu_cap(X86_FEATURE_AVX512ER);
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- setup_clear_cpu_cap(X86_FEATURE_AVX512CD);
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- setup_clear_cpu_cap(X86_FEATURE_AVX512DQ);
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- setup_clear_cpu_cap(X86_FEATURE_AVX512BW);
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- setup_clear_cpu_cap(X86_FEATURE_AVX512VL);
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- setup_clear_cpu_cap(X86_FEATURE_MPX);
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- setup_clear_cpu_cap(X86_FEATURE_XGETBV1);
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- setup_clear_cpu_cap(X86_FEATURE_AVX512VBMI);
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- setup_clear_cpu_cap(X86_FEATURE_PKU);
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- setup_clear_cpu_cap(X86_FEATURE_AVX512_4VNNIW);
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- setup_clear_cpu_cap(X86_FEATURE_AVX512_4FMAPS);
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- setup_clear_cpu_cap(X86_FEATURE_AVX512_VPOPCNTDQ);
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}
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/*
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--
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2.14.2
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