Patch "[PATCH 25/30] powerpc/speculation: Support 'mitigations=' cmdline" has been added to the 4.19-stable tree
gregkh at linuxfoundation.org
gregkh at linuxfoundation.org
Wed May 15 03:06:14 AEST 2019
This is a note to let you know that I've just added the patch titled
[PATCH 25/30] powerpc/speculation: Support 'mitigations=' cmdline
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
0025-powerpc-speculation-Support-mitigations-cmdline-opti.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable at vger.kernel.org> know about it.
>From 1caa66c02b21ad771c6bfa38327c68ba308a633d Mon Sep 17 00:00:00 2001
From: Josh Poimboeuf <jpoimboe at redhat.com>
Date: Fri, 12 Apr 2019 15:39:30 -0500
Subject: [PATCH 25/30] powerpc/speculation: Support 'mitigations=' cmdline
option
commit 782e69efb3dfed6e8360bc612e8c7827a901a8f9 upstream
Configure powerpc CPU runtime speculation bug mitigations in accordance
with the 'mitigations=' cmdline option. This affects Meltdown, Spectre
v1, Spectre v2, and Speculative Store Bypass.
The default behavior is unchanged.
Signed-off-by: Josh Poimboeuf <jpoimboe at redhat.com>
Signed-off-by: Thomas Gleixner <tglx at linutronix.de>
Tested-by: Jiri Kosina <jkosina at suse.cz> (on x86)
Reviewed-by: Jiri Kosina <jkosina at suse.cz>
Cc: Borislav Petkov <bp at alien8.de>
Cc: "H . Peter Anvin" <hpa at zytor.com>
Cc: Andy Lutomirski <luto at kernel.org>
Cc: Peter Zijlstra <peterz at infradead.org>
Cc: Jiri Kosina <jikos at kernel.org>
Cc: Waiman Long <longman at redhat.com>
Cc: Andrea Arcangeli <aarcange at redhat.com>
Cc: Jon Masters <jcm at redhat.com>
Cc: Benjamin Herrenschmidt <benh at kernel.crashing.org>
Cc: Paul Mackerras <paulus at samba.org>
Cc: Michael Ellerman <mpe at ellerman.id.au>
Cc: linuxppc-dev at lists.ozlabs.org
Cc: Martin Schwidefsky <schwidefsky at de.ibm.com>
Cc: Heiko Carstens <heiko.carstens at de.ibm.com>
Cc: linux-s390 at vger.kernel.org
Cc: Catalin Marinas <catalin.marinas at arm.com>
Cc: Will Deacon <will.deacon at arm.com>
Cc: linux-arm-kernel at lists.infradead.org
Cc: linux-arch at vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
Cc: Tyler Hicks <tyhicks at canonical.com>
Cc: Linus Torvalds <torvalds at linux-foundation.org>
Cc: Randy Dunlap <rdunlap at infradead.org>
Cc: Steven Price <steven.price at arm.com>
Cc: Phil Auld <pauld at redhat.com>
Link: https://lkml.kernel.org/r/245a606e1a42a558a310220312d9b6adb9159df6.1555085500.git.jpoimboe@redhat.com
Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
---
Documentation/admin-guide/kernel-parameters.txt | 9 +++++----
arch/powerpc/kernel/security.c | 6 +++---
arch/powerpc/kernel/setup_64.c | 2 +-
3 files changed, 9 insertions(+), 8 deletions(-)
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 31c17532c219..49aa191979c1 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -2503,7 +2503,7 @@
http://repo.or.cz/w/linux-2.6/mini2440.git
mitigations=
- [X86] Control optional mitigations for CPU
+ [X86,PPC] Control optional mitigations for CPU
vulnerabilities. This is a set of curated,
arch-independent options, each of which is an
aggregation of existing arch-specific options.
@@ -2512,10 +2512,11 @@
Disable all optional CPU mitigations. This
improves system performance, but it may also
expose users to several CPU vulnerabilities.
- Equivalent to: nopti [X86]
- nospectre_v2 [X86]
+ Equivalent to: nopti [X86,PPC]
+ nospectre_v1 [PPC]
+ nospectre_v2 [X86,PPC]
spectre_v2_user=off [X86]
- spec_store_bypass_disable=off [X86]
+ spec_store_bypass_disable=off [X86,PPC]
l1tf=off [X86]
auto (default)
diff --git a/arch/powerpc/kernel/security.c b/arch/powerpc/kernel/security.c
index 1341325599a7..4ccbf611a3c5 100644
--- a/arch/powerpc/kernel/security.c
+++ b/arch/powerpc/kernel/security.c
@@ -56,7 +56,7 @@ void setup_barrier_nospec(void)
enable = security_ftr_enabled(SEC_FTR_FAVOUR_SECURITY) &&
security_ftr_enabled(SEC_FTR_BNDS_CHK_SPEC_BAR);
- if (!no_nospec)
+ if (!no_nospec && !cpu_mitigations_off())
enable_barrier_nospec(enable);
}
@@ -115,7 +115,7 @@ static int __init handle_nospectre_v2(char *p)
early_param("nospectre_v2", handle_nospectre_v2);
void setup_spectre_v2(void)
{
- if (no_spectrev2)
+ if (no_spectrev2 || cpu_mitigations_off())
do_btb_flush_fixups();
else
btb_flush_enabled = true;
@@ -299,7 +299,7 @@ void setup_stf_barrier(void)
stf_enabled_flush_types = type;
- if (!no_stf_barrier)
+ if (!no_stf_barrier && !cpu_mitigations_off())
stf_barrier_enable(enable);
}
diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
index faf00222b324..eaf7300be5ab 100644
--- a/arch/powerpc/kernel/setup_64.c
+++ b/arch/powerpc/kernel/setup_64.c
@@ -955,7 +955,7 @@ void setup_rfi_flush(enum l1d_flush_type types, bool enable)
enabled_flush_types = types;
- if (!no_rfi_flush)
+ if (!no_rfi_flush && !cpu_mitigations_off())
rfi_flush_enable(enable);
}
--
2.21.0
Patches currently in stable-queue which might be from jpoimboe at redhat.com are
queue-4.19/0025-powerpc-speculation-Support-mitigations-cmdline-opti.patch
queue-4.19/0022-x86-speculation-mds-Print-SMT-vulnerable-on-MSBDS-wi.patch
queue-4.19/0024-x86-speculation-Support-mitigations-cmdline-option.patch
queue-4.19/0023-cpu-speculation-Add-mitigations-cmdline-option.patch
queue-4.19/0018-x86-speculation-mds-Add-mds-full-nosmt-cmdline-optio.patch
queue-4.19/0030-x86-speculation-mds-Fix-documentation-typo.patch
queue-4.19/0027-x86-speculation-mds-Add-mitigations-support-for-MDS.patch
queue-4.19/0020-x86-speculation-mds-Add-SMT-warning-message.patch
queue-4.19/0001-Documentation-l1tf-Fix-small-spelling-typo.patch
queue-4.19/0019-x86-speculation-Move-arch_smt_update-call-to-after-m.patch
queue-4.19/0026-s390-speculation-Support-mitigations-cmdline-option.patch
queue-4.19/0021-x86-speculation-mds-Fix-comment.patch
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