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[Xen-devel] [PATCH v3 05/27] x86: relocate_kernel - 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>, Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>, Thomas Garnier <thgarnie@xxxxxxxxxx>, Philippe Ombredanne <pombredanne@xxxxxxxx>, Kate Stewart <kstewart@xxxxxxxxxxxxxxxxxxx>, Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>, Yonghong Song <yhs@xxxxxx>, Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>, Kees Cook <keescook@xxxxxxxxxxxx>, Tom Lendacky <thomas.lendacky@xxxxxxx>, "Kirill A . Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxx>, Dominik Brodowski <linux@xxxxxxxxxxxxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Borislav Petkov <bp@xxxxxxx>, "Rafael J . Wysocki" <rjw@xxxxxxxxxxxxx>, Len Brown <len.brown@xxxxxxxxx>, Pavel Machek <pavel@xxxxxx>, Juergen Gross <jgross@xxxxxxxx>, Alok Kataria <akataria@xxxxxxxxxx>, Steven Rostedt <rostedt@xxxxxxxxxxx>, Jan Kiszka <jan.kiszka@xxxxxxxxxxx>, Tejun Heo <tj@xxxxxxxxxx>, Christoph Lameter <cl@xxxxxxxxx>, Dennis Zhou <dennisszhou@xxxxxxxxx>, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, Alexey Dobriyan <adobriyan@xxxxxxxxx>, Masami Hiramatsu <mhiramat@xxxxxxxxxx>, Cao jin <caoj.fnst@xxxxxxxxxxxxxx>, Francis Deslauriers <francis.deslauriers@xxxxxxxxxxxx>, "Paul E . McKenney" <paulmck@xxxxxxxxxxxxxxxxxx>, Nicolas Pitre <nicolas.pitre@xxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Randy Dunlap <rdunlap@xxxxxxxxxxxxx>, "Luis R . Rodriguez" <mcgrof@xxxxxxxxxx>, Arnd Bergmann <arnd@xxxxxxxx>, Christopher Li <sparse@xxxxxxxxxxx>, Jason Baron <jbaron@xxxxxxxxxx>, Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>, Lukas Wunner <lukas@xxxxxxxxx>, Dou Liyang <douly.fnst@xxxxxxxxxxxxxx>, Sergey Senozhatsky <sergey.senozhatsky.work@xxxxxxxxx>, Petr Mladek <pmladek@xxxxxxxx>, Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Nicholas Piggin <npiggin@xxxxxxxxx>, "H . J . Lu" <hjl.tools@xxxxxxxxx>, Paolo Bonzini <pbonzini@xxxxxxxxxx>, Radim Krčmář <rkrcmar@xxxxxxxxxx>, Joerg Roedel <joro@xxxxxxxxxx>, David Woodhouse <dwmw@xxxxxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, Rik van Riel <riel@xxxxxxxxxx>, Jia Zhang <qianyue.zj@xxxxxxxxxxxxxxx>, Ricardo Neri <ricardo.neri-calderon@xxxxxxxxxxxxxxx>, Jonathan Corbet <corbet@xxxxxxx>, Jan Beulich <JBeulich@xxxxxxxx>, Matthias Kaehlcke <mka@xxxxxxxxxxxx>, Baoquan He <bhe@xxxxxxxxxx>, Jan H . Schönherr <jschoenh@xxxxxxxxx>, Daniel Micay <danielmicay@xxxxxxxxx>
- From: Thomas Garnier <thgarnie@xxxxxxxxxx>
- Date: Wed, 23 May 2018 12:53:59 -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, 23 May 2018 19:55:20 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.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/kernel/relocate_kernel_64.S | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/arch/x86/kernel/relocate_kernel_64.S
b/arch/x86/kernel/relocate_kernel_64.S
index 11eda21eb697..a7227dfe1a2b 100644
--- a/arch/x86/kernel/relocate_kernel_64.S
+++ b/arch/x86/kernel/relocate_kernel_64.S
@@ -208,9 +208,11 @@ identity_mapped:
movq %rax, %cr3
lea PAGE_SIZE(%r8), %rsp
call swap_pages
- movq $virtual_mapped, %rax
- pushq %rax
- ret
+ jmp *virtual_mapped_addr(%rip)
+
+ /* Absolute value for PIE support */
+virtual_mapped_addr:
+ .quad virtual_mapped
virtual_mapped:
movq RSP(%r8), %rsp
--
2.17.0.441.gb46fe60e1d-goog
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