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[Xen-devel] [PATCH 1/5] x86-64: Pad vDSO to a page boundary

To: x86@xxxxxxxxxx, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Subject: [Xen-devel] [PATCH 1/5] x86-64: Pad vDSO to a page boundary
From: Andy Lutomirski <luto@xxxxxxx>
Date: Tue, 26 Jul 2011 23:20:35 -0400
Cc: jeremy@xxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxx, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx, keir.xen@xxxxxxxxx, Andy Lutomirski <luto@xxxxxxx>
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This avoids an information leak to userspace.

Signed-off-by: Andy Lutomirski <luto@xxxxxxx>
---
 arch/x86/vdso/vdso.S |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/arch/x86/vdso/vdso.S b/arch/x86/vdso/vdso.S
index 1b979c1..01f5e3b 100644
--- a/arch/x86/vdso/vdso.S
+++ b/arch/x86/vdso/vdso.S
@@ -9,6 +9,7 @@ __PAGE_ALIGNED_DATA
 vdso_start:
        .incbin "arch/x86/vdso/vdso.so"
 vdso_end:
+       .align PAGE_SIZE /* extra data here leaks to userspace. */
 
 .previous
 
-- 
1.7.6


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