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@mentor.com>
Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Link: http://lkml.kernel.org/r/e4c8bf4bc2725bda22c4a4b7d0c82adcd8f8d9b8.1406330779.git.luto@amacapital.net
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
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 @@
vma = _install_special_mapping(mm,
addr,
-image->sym_vvar_start,
- VM_READ,
+ VM_READ|VM_MAYREAD,
&vvar_mapping);
if (IS_ERR(vma)) {