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

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Message-Id: <8a9c7b051547171afd88fc53a6416a001f76ec4a.1311736366.git.luto@mit.edu>
Date:	Tue, 26 Jul 2011 23:20:35 -0400
From:	Andy Lutomirski <luto@....EDU>
To:	x86@...nel.org, Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	jeremy@...p.org, keir.xen@...il.com, xen-devel@...ts.xensource.com,
	virtualization@...ts.linux-foundation.org,
	Andy Lutomirski <luto@....edu>
Subject: [PATCH 1/5] x86-64: Pad vDSO to a page boundary

This avoids an information leak to userspace.

Signed-off-by: Andy Lutomirski <luto@....edu>
---
 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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