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[Xen-devel] [PATCH v1 11/27] x86/power/64: Adapt assembly for PIE support
- To: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>, "David S . Miller" <davem@xxxxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, "H . Peter Anvin" <hpa@xxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Josh Poimboeuf <jpoimboe@xxxxxxxxxx>, Arnd Bergmann <arnd@xxxxxxxx>, Thomas Garnier <thgarnie@xxxxxxxxxx>, Kees Cook <keescook@xxxxxxxxxxxx>, Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>, Matthias Kaehlcke <mka@xxxxxxxxxxxx>, Tom Lendacky <thomas.lendacky@xxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxx>, "Kirill A . Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>, Borislav Petkov <bp@xxxxxxx>, "Rafael J . Wysocki" <rjw@xxxxxxxxxxxxx>, Len Brown <len.brown@xxxxxxxxx>, Pavel Machek <pavel@xxxxxx>, Juergen Gross <jgross@xxxxxxxx>, Chris Wright <chrisw@xxxxxxxxxxxx>, Alok Kataria <akataria@xxxxxxxxxx>, Rusty Russell <rusty@xxxxxxxxxxxxxxx>, Tejun Heo <tj@xxxxxxxxxx>, Christoph Lameter <cl@xxxxxxxxx>, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, Paul Gortmaker <paul.gortmaker@xxxxxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Alexey Dobriyan <adobriyan@xxxxxxxxx>, "Paul E . McKenney" <paulmck@xxxxxxxxxxxxxxxxxx>, Nicolas Pitre <nicolas.pitre@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, "Luis R . Rodriguez" <mcgrof@xxxxxxxxxx>, Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>, Christopher Li <sparse@xxxxxxxxxxx>, Steven Rostedt <rostedt@xxxxxxxxxxx>, Jason Baron <jbaron@xxxxxxxxxx>, Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>, Dou Liyang <douly.fnst@xxxxxxxxxxxxxx>, "Rafael J . Wysocki" <rafael.j.wysocki@xxxxxxxxx>, Lukas Wunner <lukas@xxxxxxxxx>, Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>, Alexei Starovoitov <ast@xxxxxxxxxx>, Daniel Borkmann <daniel@xxxxxxxxxxxxx>, Markus Trippelsdorf <markus@xxxxxxxxxxxxxxx>, Paolo Bonzini <pbonzini@xxxxxxxxxx>, Radim Krčmář <rkrcmar@xxxxxxxxxx>, Joerg Roedel <joro@xxxxxxxxxx>, Rik van Riel <riel@xxxxxxxxxx>, David Howells <dhowells@xxxxxxxxxx>, Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>, Waiman Long <longman@xxxxxxxxxx>, Kyle Huey <me@xxxxxxxxxxxx>, Jonathan Corbet <corbet@xxxxxxx>, Michal Hocko <mhocko@xxxxxxxx>, Peter Foley <pefoley2@xxxxxxxxxxx>, Paul Bolle <pebolle@xxxxxxxxxx>, Jiri Kosina <jkosina@xxxxxxx>, "H . J . Lu" <hjl.tools@xxxxxxxxx>, Rob Landley <rob@xxxxxxxxxxx>, Baoquan He <bhe@xxxxxxxxxx>, Jan H . Schönherr <jschoenh@xxxxxxxxx>, Daniel Micay <danielmicay@xxxxxxxxx>
- From: Thomas Garnier <thgarnie@xxxxxxxxxx>
- Date: Wed, 11 Oct 2017 13:30:11 -0700
- Cc: linux-arch@xxxxxxxxxxxxxxx, kvm@xxxxxxxxxxxxxxx, linux-pm@xxxxxxxxxxxxxxx, x86@xxxxxxxxxx, linux-doc@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx, linux-sparse@xxxxxxxxxxxxxxx, linux-crypto@xxxxxxxxxxxxxxx, kernel-hardening@xxxxxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Wed, 11 Oct 2017 20:31:26 +0000
- List-id: Xen developer discussion <xen-devel.lists.xen.org>
Change the assembly code to use only relative references of symbols for the
kernel to be PIE compatible.
Position Independent Executable (PIE) support will allow to extended the
KASLR randomization range below the -2G memory limit.
Signed-off-by: Thomas Garnier <thgarnie@xxxxxxxxxx>
---
arch/x86/power/hibernate_asm_64.S | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/x86/power/hibernate_asm_64.S
b/arch/x86/power/hibernate_asm_64.S
index ce8da3a0412c..6fdd7bbc3c33 100644
--- a/arch/x86/power/hibernate_asm_64.S
+++ b/arch/x86/power/hibernate_asm_64.S
@@ -24,7 +24,7 @@
#include <asm/frame.h>
ENTRY(swsusp_arch_suspend)
- movq $saved_context, %rax
+ leaq saved_context(%rip), %rax
movq %rsp, pt_regs_sp(%rax)
movq %rbp, pt_regs_bp(%rax)
movq %rsi, pt_regs_si(%rax)
@@ -115,7 +115,7 @@ ENTRY(restore_registers)
movq %rax, %cr4; # turn PGE back on
/* We don't restore %rax, it must be 0 anyway */
- movq $saved_context, %rax
+ leaq saved_context(%rip), %rax
movq pt_regs_sp(%rax), %rsp
movq pt_regs_bp(%rax), %rbp
movq pt_regs_si(%rax), %rsi
--
2.15.0.rc0.271.g36b669edcc-goog
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