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List:       linux-virtualization
Subject:    [PATCH 1/5] x86-64: Pad vDSO to a page boundary
From:       Andy Lutomirski <luto () mit ! edu>
Date:       2011-07-27 3:20:35
Message-ID: 8a9c7b051547171afd88fc53a6416a001f76ec4a.1311736366.git.luto () mit ! edu
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This avoids an information leak to userspace.

Signed-off-by: Andy Lutomirski <luto@mit.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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