diff options
Diffstat (limited to 'common/recipes-kernel/linux/linux-yocto-4.9.21/0084-x86-cpu-x86-pti-Do-not-enable-PTI-on-AMD-processors.patch')
-rw-r--r-- | common/recipes-kernel/linux/linux-yocto-4.9.21/0084-x86-cpu-x86-pti-Do-not-enable-PTI-on-AMD-processors.patch | 48 |
1 files changed, 0 insertions, 48 deletions
diff --git a/common/recipes-kernel/linux/linux-yocto-4.9.21/0084-x86-cpu-x86-pti-Do-not-enable-PTI-on-AMD-processors.patch b/common/recipes-kernel/linux/linux-yocto-4.9.21/0084-x86-cpu-x86-pti-Do-not-enable-PTI-on-AMD-processors.patch deleted file mode 100644 index 6e315ccf..00000000 --- a/common/recipes-kernel/linux/linux-yocto-4.9.21/0084-x86-cpu-x86-pti-Do-not-enable-PTI-on-AMD-processors.patch +++ /dev/null @@ -1,48 +0,0 @@ -From ebd4f926752058a42c6da41e80b44a82aa4d14f5 Mon Sep 17 00:00:00 2001 -From: Tom Lendacky <thomas.lendacky@amd.com> -Date: Tue, 26 Dec 2017 23:43:54 -0600 -Subject: [PATCH 084/103] x86/cpu, x86/pti: Do not enable PTI on AMD processors - -commit 694d99d40972f12e59a3696effee8a376b79d7c8 upstream. - -AMD processors are not subject to the types of attacks that the kernel -page table isolation feature protects against. The AMD microarchitecture -does not allow memory references, including speculative references, that -access higher privileged data when running in a lesser privileged mode -when that access would result in a page fault. - -Disable page table isolation by default on AMD processors by not setting -the X86_BUG_CPU_INSECURE feature, which controls whether X86_FEATURE_PTI -is set. - -Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com> -Signed-off-by: Thomas Gleixner <tglx@linutronix.de> -Reviewed-by: Borislav Petkov <bp@suse.de> -Cc: Dave Hansen <dave.hansen@linux.intel.com> -Cc: Andy Lutomirski <luto@kernel.org> -Cc: stable@vger.kernel.org -Link: https://lkml.kernel.org/r/20171227054354.20369.94587.stgit@tlendack-t1.amdoffice.net -Cc: Nick Lowe <nick.lowe@gmail.com> -Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> ---- - arch/x86/kernel/cpu/common.c | 4 ++-- - 1 file changed, 2 insertions(+), 2 deletions(-) - -diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c -index 7b9ae04..d198ae0 100644 ---- a/arch/x86/kernel/cpu/common.c -+++ b/arch/x86/kernel/cpu/common.c -@@ -883,8 +883,8 @@ static void __init early_identify_cpu(struct cpuinfo_x86 *c) - - setup_force_cpu_cap(X86_FEATURE_ALWAYS); - -- /* Assume for now that ALL x86 CPUs are insecure */ -- setup_force_cpu_bug(X86_BUG_CPU_MELTDOWN); -+ if (c->x86_vendor != X86_VENDOR_AMD) -+ setup_force_cpu_bug(X86_BUG_CPU_MELTDOWN); - - setup_force_cpu_bug(X86_BUG_SPECTRE_V1); - setup_force_cpu_bug(X86_BUG_SPECTRE_V2); --- -2.7.4 - |