[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Xen-devel] [RFC 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>, Thomas Garnier <thgarnie@xxxxxxxxxx>, Arnd Bergmann <arnd@xxxxxxxx>, Kees Cook <keescook@xxxxxxxxxxxx>, 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>, Alexey Dobriyan <adobriyan@xxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Paul Gortmaker <paul.gortmaker@xxxxxxxxxxxxx>, Chris Metcalf <cmetcalf@xxxxxxxxxxxx>, "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>, Dou Liyang <douly.fnst@xxxxxxxxxxxxxx>, "Rafael J . Wysocki" <rafael.j.wysocki@xxxxxxxxx>, Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>, 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>, Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>, Jonathan Corbet <corbet@xxxxxxx>, Matthew Wilcox <mawilcox@xxxxxxxxxxxxx>, Michal Hocko <mhocko@xxxxxxxx>, Peter Foley <pefoley2@xxxxxxxxxxx>, Paul Bolle <pebolle@xxxxxxxxxx>, Jiri Kosina <jkosina@xxxxxxx>, Rob Landley <rob@xxxxxxxxxxx>, "H . J . Lu" <hjl.tools@xxxxxxxxx>, Baoquan He <bhe@xxxxxxxxxx>, Jan H . Schönherr <jschoenh@xxxxxxxxx>, Daniel Micay <danielmicay@xxxxxxxxx>
- From: Thomas Garnier <thgarnie@xxxxxxxxxx>
- Date: Wed, 4 Oct 2017 14:19:41 -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, 04 Oct 2017 21:20:59 +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/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 307d3bac5f04..2ecbdcbe985b 100644
--- a/arch/x86/kernel/relocate_kernel_64.S
+++ b/arch/x86/kernel/relocate_kernel_64.S
@@ -200,9 +200,11 @@ 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
--
2.14.2.920.gcf0c67979c-goog
_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
https://lists.xen.org/xen-devel
|
