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x86-64: Pad vDSO to a page boundary
author
Andy Lutomirski
<luto@MIT.EDU>
Wed, 3 Aug 2011 13:31:49 +0000
(09:31 -0400)
committer
H. 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
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diff --git
a/arch/x86/vdso/vdso.S
b/arch/x86/vdso/vdso.S
index
1b979c1
..
01f5e3b
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. */
.previous