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x86-64: Pad vDSO to a page boundary
authorAndy Lutomirski <luto@MIT.EDU>
Wed, 3 Aug 2011 13:31:49 +0000 (09:31 -0400)
committerH. Peter Anvin <hpa@linux.intel.com>
Thu, 4 Aug 2011 23:13:34 +0000 (16:13 -0700)
This avoids an information leak to userspace.

Signed-off-by: Andy Lutomirski <luto@mit.edu>
Link: http://lkml.kernel.org/r/a63380a3c58a0506a2f5a18ba1b12dbde1f25e58.1312378163.git.luto@mit.edu
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
arch/x86/vdso/vdso.S patch | blob | blame | history

diff --git a/arch/x86/vdso/vdso.S b/arch/x86/vdso/vdso.S
index 1b979c12ba85b0d17443e1037580667649cbee1a..01f5e3b4613cb88212dee66e191711ae8bd814c6 100644 (file)
--- 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. */
 
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