From: Thomas Garnier <thgarnie@google.com>
To: "Herbert Xu" <herbert@gondor.apana.org.au>,
"David S . Miller" <davem@davemloft.net>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Ingo Molnar" <mingo@redhat.com>,
"H . Peter Anvin" <hpa@zytor.com>,
"Peter Zijlstra" <peterz@infradead.org>,
"Josh Poimboeuf" <jpoimboe@redhat.com>,
"Thomas Garnier" <thgarnie@google.com>,
"Arnd Bergmann" <arnd@arndb.de>,
"Matthias Kaehlcke" <mka@chromium.org>,
"Boris Ostrovsky" <boris.ostrovsky@oracle.com>,
"Juergen Gross" <jgross@suse.com>,
"Paolo Bonzini" <pbonzini@redhat.com>,
"Radim Krčmář" <rkrcmar@redhat.com>,
"Joerg Roedel" <joro@8bytes.org>,
"Andy Lutomirski" <luto@kernel.org>,
"Borislav Petkov" <bp@alien8.de>,
"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
"Brian Gerst" <brgerst@gmail.com>, "Borislav Petkov" <bp@suse.de>,
"Christian Borntraeger" <borntraeger@de.ibm.com>,
"Rafael J . Wysocki" <rjw@rjwysocki.net>
Cc: linux-arch@vger.kernel.org, kvm@vger.kernel.org,
linux-pm@vger.kernel.org, x86@kernel.org,
linux-kernel@vger.kernel.org, linux-sparse@vger.kernel.org,
linux-crypto@vger.kernel.org,
kernel-hardening@lists.openwall.com,
xen-devel@lists.xenproject.org
Subject: [RFC 19/22] x86/pie: Add option to build the kernel as PIE for x86_64
Date: Tue, 18 Jul 2017 15:33:30 -0700 [thread overview]
Message-ID: <20170718223333.110371-20-thgarnie@google.com> (raw)
In-Reply-To: <20170718223333.110371-1-thgarnie@google.com>
Add the CONFIG_X86_PIE option which builds the kernel as a Position
Independent Executable (PIE). The kernel is currently build with the
mcmodel=kernel option which forces it to stay on the top 2G of the
virtual address space. With PIE, the kernel will be able to move below
the -2G limit increasing the KASLR range from 1GB to 3GB.
The modules do not support PIE due to how they are linked. Disable PIE
for them and default to mcmodel=kernel for now.
The PIE configuration is not yet compatible with XEN_PVH. Xen PVH
generates 32-bit assembly and uses a long jump to transition to 64-bit.
A long jump require an absolute reference that is not compatible with
PIE.
Performance/Size impact:
Hackbench (50% and 1600% loads):
- PIE disabled: no significant change (-0.50% / +0.50%)
- PIE enabled: 7% to 8% on half load, 10% on heavy load.
These results are aligned with the different research on user-mode PIE
impact on cpu intensive benchmarks (around 10% on x86_64).
slab_test (average of 10 runs):
- PIE disabled: no significant change (-1% / +1%)
- PIE enabled: 3% to 4%
Kernbench (average of 10 Half and Optimal runs):
Elapsed Time:
- PIE disabled: no significant change (-0.22% / +0.06%)
- PIE enabled: around 0.50%
System Time:
- PIE disabled: no significant change (-0.99% / -1.28%)
- PIE enabled: 5% to 6%
Size of vmlinux (Ubuntu configuration):
File size:
- PIE disabled: 472928672 bytes (-0.000169% from baseline)
- PIE enabled: 216878461 bytes (-54.14% from baseline)
.text sections:
- PIE disabled: 9373572 bytes (+0.04% from baseline)
- PIE enabled: 9499138 bytes (+1.38% from baseline)
The big decrease in vmlinux file size is due to the lower number of
relocations appended to the file.
Signed-off-by: Thomas Garnier <thgarnie@google.com>
---
arch/x86/Kconfig | 6 ++++++
arch/x86/Makefile | 9 +++++++++
2 files changed, 15 insertions(+)
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 781521b7cf9e..b26ee6751021 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -2080,6 +2080,12 @@ config RANDOMIZE_MEMORY_PHYSICAL_PADDING
If unsure, leave at the default value.
+config X86_PIE
+ bool
+ depends on X86_64 && !XEN_PVH
+ select DEFAULT_HIDDEN
+ select MODULE_REL_CRCS if MODVERSIONS
+
config HOTPLUG_CPU
bool "Support for hot-pluggable CPUs"
depends on SMP
diff --git a/arch/x86/Makefile b/arch/x86/Makefile
index 1e902f926be3..452a9621af8f 100644
--- a/arch/x86/Makefile
+++ b/arch/x86/Makefile
@@ -45,8 +45,12 @@ export REALMODE_CFLAGS
export BITS
ifdef CONFIG_X86_NEED_RELOCS
+ifdef CONFIG_X86_PIE
+ LDFLAGS_vmlinux := -pie -shared -Bsymbolic
+else
LDFLAGS_vmlinux := --emit-relocs
endif
+endif
#
# Prevent GCC from generating any FP code by mistake.
@@ -132,7 +136,12 @@ else
KBUILD_CFLAGS += $(cflags-y)
KBUILD_CFLAGS += -mno-red-zone
+ifdef CONFIG_X86_PIE
+ KBUILD_CFLAGS += -fPIC
+ KBUILD_CFLAGS_MODULE += -fno-PIC -mcmodel=kernel
+else
KBUILD_CFLAGS += -mcmodel=kernel
+endif
# -funit-at-a-time shrinks the kernel .text considerably
# unfortunately it makes reading oopses harder.
--
2.13.2.932.g7449e964c-goog
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
https://lists.xen.org/xen-devel
WARNING: multiple messages have this Message-ID (diff)
From: Thomas Garnier <thgarnie@google.com>
To: "Herbert Xu" <herbert@gondor.apana.org.au>,
"David S . Miller" <davem@davemloft.net>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Ingo Molnar" <mingo@redhat.com>,
"H . Peter Anvin" <hpa@zytor.com>,
"Peter Zijlstra" <peterz@infradead.org>,
"Josh Poimboeuf" <jpoimboe@redhat.com>,
"Thomas Garnier" <thgarnie@google.com>,
"Arnd Bergmann" <arnd@arndb.de>,
"Matthias Kaehlcke" <mka@chromium.org>,
"Boris Ostrovsky" <boris.ostrovsky@oracle.com>,
"Juergen Gross" <jgross@suse.com>,
"Paolo Bonzini" <pbonzini@redhat.com>,
"Radim Krčmář" <rkrcmar@redhat.com>,
"Joerg Roedel" <joro@8bytes.org>,
"Andy Lutomirski" <luto@kernel.org>,
"Borislav Petkov" <bp@alien8.de>,
"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
"Brian Gerst" <brgerst@gmail.com>, "Borislav Petkov" <bp@suse.de>,
"Christian Borntraeger" <borntraeger@de.ibm.com>,
"Rafael J . Wysocki" <rjw@rjwysocki.net>,
"Len Brown" <len.brown@intel.com>, "Pavel Machek" <pavel@ucw.cz>,
"Tejun Heo" <tj@kernel.org>, "Christoph Lameter" <cl@linux.com>,
"Kees Cook" <keescook@chromium.org>,
"Paul Gortmaker" <paul.gortmaker@windriver.com>,
"Chris Metcalf" <cmetcalf@mellanox.com>,
"Paul E . McKenney" <paulmck@linux.vnet.ibm.com>,
"Andrew Morton" <akpm@linux-foundation.org>,
"Christopher Li" <sparse@chrisli.org>,
"Dou Liyang" <douly.fnst@cn.fujitsu.com>,
"Masahiro Yamada" <yamada.masahiro@socionext.com>,
"Daniel Borkmann" <daniel@iogearbox.net>,
"Markus Trippelsdorf" <markus@trippelsdorf.de>,
"Peter Foley" <pefoley2@pefoley.com>,
"Steven Rostedt" <rostedt@goodmis.org>,
"Tim Chen" <tim.c.chen@linux.intel.com>,
"Ard Biesheuvel" <ard.biesheuvel@linaro.org>,
"Catalin Marinas" <catalin.marinas@arm.com>,
"Matthew Wilcox" <mawilcox@microsoft.com>,
"Michal Hocko" <mhocko@suse.com>, "Rob Landley" <rob@landley.net>,
"Jiri Kosina" <jkosina@suse.cz>,
"H . J . Lu" <hjl.tools@gmail.com>,
"Paul Bolle" <pebolle@tiscali.nl>, "Baoquan He" <bhe@redhat.com>,
"Daniel Micay" <danielmicay@gmail.com>
Cc: x86@kernel.org, linux-crypto@vger.kernel.org,
linux-kernel@vger.kernel.org, xen-devel@lists.xenproject.org,
kvm@vger.kernel.org, linux-pm@vger.kernel.org,
linux-arch@vger.kernel.org, linux-sparse@vger.kernel.org,
kernel-hardening@lists.openwall.com
Subject: [kernel-hardening] [RFC 19/22] x86/pie: Add option to build the kernel as PIE for x86_64
Date: Tue, 18 Jul 2017 15:33:30 -0700 [thread overview]
Message-ID: <20170718223333.110371-20-thgarnie@google.com> (raw)
In-Reply-To: <20170718223333.110371-1-thgarnie@google.com>
Add the CONFIG_X86_PIE option which builds the kernel as a Position
Independent Executable (PIE). The kernel is currently build with the
mcmodel=kernel option which forces it to stay on the top 2G of the
virtual address space. With PIE, the kernel will be able to move below
the -2G limit increasing the KASLR range from 1GB to 3GB.
The modules do not support PIE due to how they are linked. Disable PIE
for them and default to mcmodel=kernel for now.
The PIE configuration is not yet compatible with XEN_PVH. Xen PVH
generates 32-bit assembly and uses a long jump to transition to 64-bit.
A long jump require an absolute reference that is not compatible with
PIE.
Performance/Size impact:
Hackbench (50% and 1600% loads):
- PIE disabled: no significant change (-0.50% / +0.50%)
- PIE enabled: 7% to 8% on half load, 10% on heavy load.
These results are aligned with the different research on user-mode PIE
impact on cpu intensive benchmarks (around 10% on x86_64).
slab_test (average of 10 runs):
- PIE disabled: no significant change (-1% / +1%)
- PIE enabled: 3% to 4%
Kernbench (average of 10 Half and Optimal runs):
Elapsed Time:
- PIE disabled: no significant change (-0.22% / +0.06%)
- PIE enabled: around 0.50%
System Time:
- PIE disabled: no significant change (-0.99% / -1.28%)
- PIE enabled: 5% to 6%
Size of vmlinux (Ubuntu configuration):
File size:
- PIE disabled: 472928672 bytes (-0.000169% from baseline)
- PIE enabled: 216878461 bytes (-54.14% from baseline)
.text sections:
- PIE disabled: 9373572 bytes (+0.04% from baseline)
- PIE enabled: 9499138 bytes (+1.38% from baseline)
The big decrease in vmlinux file size is due to the lower number of
relocations appended to the file.
Signed-off-by: Thomas Garnier <thgarnie@google.com>
---
arch/x86/Kconfig | 6 ++++++
arch/x86/Makefile | 9 +++++++++
2 files changed, 15 insertions(+)
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 781521b7cf9e..b26ee6751021 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -2080,6 +2080,12 @@ config RANDOMIZE_MEMORY_PHYSICAL_PADDING
If unsure, leave at the default value.
+config X86_PIE
+ bool
+ depends on X86_64 && !XEN_PVH
+ select DEFAULT_HIDDEN
+ select MODULE_REL_CRCS if MODVERSIONS
+
config HOTPLUG_CPU
bool "Support for hot-pluggable CPUs"
depends on SMP
diff --git a/arch/x86/Makefile b/arch/x86/Makefile
index 1e902f926be3..452a9621af8f 100644
--- a/arch/x86/Makefile
+++ b/arch/x86/Makefile
@@ -45,8 +45,12 @@ export REALMODE_CFLAGS
export BITS
ifdef CONFIG_X86_NEED_RELOCS
+ifdef CONFIG_X86_PIE
+ LDFLAGS_vmlinux := -pie -shared -Bsymbolic
+else
LDFLAGS_vmlinux := --emit-relocs
endif
+endif
#
# Prevent GCC from generating any FP code by mistake.
@@ -132,7 +136,12 @@ else
KBUILD_CFLAGS += $(cflags-y)
KBUILD_CFLAGS += -mno-red-zone
+ifdef CONFIG_X86_PIE
+ KBUILD_CFLAGS += -fPIC
+ KBUILD_CFLAGS_MODULE += -fno-PIC -mcmodel=kernel
+else
KBUILD_CFLAGS += -mcmodel=kernel
+endif
# -funit-at-a-time shrinks the kernel .text considerably
# unfortunately it makes reading oopses harder.
--
2.13.2.932.g7449e964c-goog
next prev parent reply other threads:[~2017-07-18 22:33 UTC|newest]
Thread overview: 151+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-07-18 22:33 x86: PIE support and option to extend KASLR randomization Thomas Garnier
2017-07-18 22:33 ` [kernel-hardening] " Thomas Garnier
2017-07-18 22:33 ` [RFC 01/22] x86/crypto: Adapt assembly for PIE support Thomas Garnier
2017-07-18 22:33 ` [kernel-hardening] " Thomas Garnier
2017-07-18 22:33 ` Thomas Garnier
2017-07-18 22:33 ` [RFC 02/22] x86: Use symbol name on bug table " Thomas Garnier
2017-07-18 22:33 ` [kernel-hardening] " Thomas Garnier
2017-07-18 22:33 ` [RFC 03/22] x86: Use symbol name in jump " Thomas Garnier
2017-07-18 22:33 ` [kernel-hardening] " Thomas Garnier
2017-07-18 22:33 ` [RFC 04/22] x86: Add macro to get symbol address " Thomas Garnier
2017-07-18 22:33 ` [kernel-hardening] " Thomas Garnier
2017-07-18 22:33 ` [RFC 05/22] xen: Adapt assembly " Thomas Garnier
2017-07-18 22:33 ` [kernel-hardening] " Thomas Garnier
2017-07-18 22:33 ` [RFC 06/22] kvm: " Thomas Garnier
2017-07-18 22:33 ` [kernel-hardening] " Thomas Garnier
2017-07-19 2:49 ` Brian Gerst
2017-07-19 2:49 ` Brian Gerst
2017-07-19 2:49 ` [kernel-hardening] " Brian Gerst
2017-07-19 15:40 ` Thomas Garnier
2017-07-19 15:40 ` Thomas Garnier
2017-07-19 15:40 ` [kernel-hardening] " Thomas Garnier
2017-07-19 22:27 ` H. Peter Anvin
2017-07-19 22:27 ` H. Peter Anvin
2017-07-19 22:27 ` [kernel-hardening] " H. Peter Anvin
2017-07-19 22:44 ` Thomas Garnier
2017-07-19 22:44 ` [kernel-hardening] " Thomas Garnier
2017-07-19 22:44 ` Thomas Garnier
2017-07-19 22:58 ` Ard Biesheuvel
2017-07-19 22:58 ` [kernel-hardening] " Ard Biesheuvel
2017-07-19 23:47 ` H. Peter Anvin
2017-07-19 23:47 ` H. Peter Anvin
2017-07-19 23:47 ` H. Peter Anvin
2017-07-19 23:47 ` H. Peter Anvin
2017-07-19 23:47 ` H. Peter Anvin
2017-07-19 23:47 ` H. Peter Anvin
2017-07-19 23:47 ` H. Peter Anvin
2017-07-19 22:58 ` Ard Biesheuvel
2017-07-18 22:33 ` [RFC 07/22] x86: relocate_kernel - " Thomas Garnier
2017-07-18 22:33 ` [kernel-hardening] " Thomas Garnier
2017-07-19 22:58 ` H. Peter Anvin
2017-07-19 22:58 ` [kernel-hardening] " H. Peter Anvin
2017-07-19 23:23 ` Thomas Garnier
2017-07-19 23:23 ` Thomas Garnier
2017-07-19 23:23 ` [kernel-hardening] " Thomas Garnier
2017-07-19 22:58 ` H. Peter Anvin
2017-07-18 22:33 ` [RFC 08/22] x86/entry/64: " Thomas Garnier
2017-07-18 22:33 ` [kernel-hardening] " Thomas Garnier
2017-07-18 22:33 ` [RFC 09/22] x86: pm-trace - " Thomas Garnier
2017-07-18 22:33 ` [kernel-hardening] " Thomas Garnier
2017-07-18 22:33 ` [RFC 10/22] x86/CPU: " Thomas Garnier
2017-07-18 22:33 ` [kernel-hardening] " Thomas Garnier
2017-07-18 22:33 ` [RFC 11/22] x86/acpi: " Thomas Garnier
2017-07-18 22:33 ` [kernel-hardening] " Thomas Garnier
2017-07-18 22:33 ` [RFC 12/22] x86/boot/64: " Thomas Garnier
2017-07-18 22:33 ` [kernel-hardening] " Thomas Garnier
2017-07-18 22:33 ` [RFC 13/22] x86/power/64: " Thomas Garnier
2017-07-18 22:33 ` [kernel-hardening] " Thomas Garnier
2017-07-19 18:41 ` Pavel Machek
2017-07-19 18:41 ` [kernel-hardening] " Pavel Machek
2017-07-19 18:41 ` Pavel Machek
2017-07-18 22:33 ` [RFC 14/22] x86/paravirt: " Thomas Garnier
2017-07-18 22:33 ` [kernel-hardening] " Thomas Garnier
2017-07-18 22:33 ` [RFC 15/22] x86/boot/64: Use _text in a global " Thomas Garnier
2017-07-18 22:33 ` [kernel-hardening] " Thomas Garnier
2017-07-18 22:33 ` [RFC 16/22] x86/percpu: Adapt percpu " Thomas Garnier
2017-07-18 22:33 ` [kernel-hardening] " Thomas Garnier
2017-07-19 3:08 ` Brian Gerst
2017-07-19 3:08 ` Brian Gerst
2017-07-19 3:08 ` [kernel-hardening] " Brian Gerst
2017-07-19 18:26 ` Thomas Garnier
2017-07-19 18:26 ` [kernel-hardening] " Thomas Garnier
2017-07-19 23:33 ` H. Peter Anvin
2017-07-19 23:33 ` [kernel-hardening] " H. Peter Anvin
2017-07-20 2:21 ` H. Peter Anvin
2017-07-20 2:21 ` [kernel-hardening] " H. Peter Anvin
2017-07-20 3:03 ` H. Peter Anvin
2017-07-20 3:03 ` H. Peter Anvin
2017-07-20 3:03 ` [kernel-hardening] " H. Peter Anvin
2017-07-20 2:21 ` H. Peter Anvin
2017-07-20 14:26 ` Thomas Garnier
2017-07-20 14:26 ` Thomas Garnier
2017-07-20 14:26 ` [kernel-hardening] " Thomas Garnier
2017-08-02 16:42 ` Thomas Garnier
2017-08-02 16:42 ` Thomas Garnier
2017-08-02 16:42 ` [kernel-hardening] " Thomas Garnier
2017-08-02 16:56 ` Kees Cook
2017-08-02 16:56 ` [kernel-hardening] " Kees Cook
2017-08-02 18:05 ` Thomas Garnier
2017-08-02 18:05 ` Thomas Garnier
2017-08-02 18:05 ` [kernel-hardening] " Thomas Garnier
2017-08-02 16:56 ` Kees Cook
2017-07-19 23:33 ` H. Peter Anvin
2017-07-19 18:26 ` Thomas Garnier
2017-07-18 22:33 ` [RFC 17/22] compiler: Option to default to hidden symbols Thomas Garnier
2017-07-18 22:33 ` [kernel-hardening] " Thomas Garnier
2017-07-18 22:33 ` [RFC 18/22] x86/relocs: Handle DYN relocations for PIE support Thomas Garnier
2017-07-18 22:33 ` [kernel-hardening] " Thomas Garnier
2017-07-18 22:33 ` Thomas Garnier [this message]
2017-07-18 22:33 ` [kernel-hardening] [RFC 19/22] x86/pie: Add option to build the kernel as PIE for x86_64 Thomas Garnier
2017-07-18 22:33 ` [RFC 20/22] x86/relocs: Add option to generate 64-bit relocations Thomas Garnier
2017-07-18 22:33 ` [kernel-hardening] " Thomas Garnier
2017-07-19 22:33 ` H. Peter Anvin
2017-07-19 22:33 ` H. Peter Anvin
2017-07-19 22:33 ` [kernel-hardening] " H. Peter Anvin
2017-07-19 22:47 ` Thomas Garnier
2017-07-19 22:47 ` [kernel-hardening] " Thomas Garnier
2017-07-19 23:08 ` H. Peter Anvin
2017-07-19 23:08 ` H. Peter Anvin
2017-07-19 23:08 ` [kernel-hardening] " H. Peter Anvin
2017-07-19 23:25 ` Thomas Garnier
2017-07-19 23:25 ` [kernel-hardening] " Thomas Garnier
2017-07-19 23:45 ` H. Peter Anvin
2017-07-19 23:45 ` H. Peter Anvin
2017-07-19 23:45 ` H. Peter Anvin
2017-07-19 23:45 ` H. Peter Anvin
2017-07-19 23:45 ` H. Peter Anvin
2017-07-19 23:45 ` H. Peter Anvin
2017-07-19 23:45 ` H. Peter Anvin
2017-07-19 23:25 ` Thomas Garnier
2017-07-19 22:47 ` Thomas Garnier
2017-07-18 22:33 ` [RFC 21/22] x86/module: Add support for mcmodel large and PLTs Thomas Garnier
2017-07-18 22:33 ` [kernel-hardening] " Thomas Garnier
2017-07-19 1:35 ` H. Peter Anvin
2017-07-19 1:35 ` [kernel-hardening] " H. Peter Anvin
2017-07-19 3:59 ` Brian Gerst
2017-07-19 3:59 ` [kernel-hardening] " Brian Gerst
2017-07-19 15:58 ` Thomas Garnier
2017-07-19 15:58 ` Thomas Garnier
2017-07-19 15:58 ` [kernel-hardening] " Thomas Garnier
2017-07-19 17:34 ` Brian Gerst
2017-07-19 17:34 ` [kernel-hardening] " Brian Gerst
2017-07-24 16:32 ` Thomas Garnier
2017-07-24 16:32 ` [kernel-hardening] " Thomas Garnier
2017-07-24 16:32 ` Thomas Garnier
2017-07-19 17:34 ` Brian Gerst
2017-07-19 3:59 ` Brian Gerst
2017-07-19 1:35 ` H. Peter Anvin
2017-07-18 22:33 ` [RFC 22/22] x86/kaslr: Add option to extend KASLR range from 1GB to 3GB Thomas Garnier
2017-07-18 22:33 ` [kernel-hardening] " Thomas Garnier
2017-07-19 12:10 ` Baoquan He
2017-07-19 12:10 ` [kernel-hardening] " Baoquan He
2017-07-19 13:49 ` Baoquan He
2017-07-19 13:49 ` Baoquan He
2017-07-19 13:49 ` [kernel-hardening] " Baoquan He
2017-07-19 12:10 ` Baoquan He
2017-07-19 14:08 ` x86: PIE support and option to extend KASLR randomization Christopher Lameter
2017-07-19 14:08 ` [kernel-hardening] " Christopher Lameter
2017-07-19 19:21 ` Kees Cook
2017-07-19 19:21 ` [kernel-hardening] " Kees Cook
2017-07-19 19:21 ` Kees Cook
2017-07-19 14:08 ` Christopher Lameter
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