Commit-ID: ac379835e820de27429b5c4eadf4c1b40320cff4
Gitweb: http://git.kernel.org/tip/ac379835e820de27429b5c4eadf4c1b40320cff4
Author: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
AuthorDate: Fri, 25 Jul 2014 16:27:01 -0700
Committer: H. Peter Anvin <hpa@xxxxxxxxxxxxxxx>
CommitDate: Fri, 25 Jul 2014 16:32:53 -0700
x86/vdso: Set VM_MAYREAD for the vvar vma
The VVAR area can, obviously, be read; that is kind of the point.
AFAIK this has no effect whatsoever unless x86 suddenly turns into a
nommu architecture. Nonetheless, not setting it is suspicious.
Reported-by: Nathan Lynch <Nathan_Lynch@xxxxxxxxxx>
Signed-off-by: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/e4c8bf4bc2725bda22c4a4b7d0c82adcd8f8d9b8.1406330779.git.luto@xxxxxxxxxxxxxx
Signed-off-by: H. Peter Anvin <hpa@xxxxxxxxxxxxxxx>
---
arch/x86/vdso/vma.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/vdso/vma.c b/arch/x86/vdso/vma.c
index dbef622..970463b 100644
--- a/arch/x86/vdso/vma.c
+++ b/arch/x86/vdso/vma.c
@@ -138,7 +138,7 @@ static int map_vdso(const struct vdso_image *image, bool calculate_addr)
vma = _install_special_mapping(mm,
addr,
-image->sym_vvar_start,
- VM_READ,
+ VM_READ|VM_MAYREAD,
&vvar_mapping);
if (IS_ERR(vma)) {
--
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