[tip:x86/vdso] x86/vdso: Set VM_MAYREAD for the vvar vma

From: tip-bot for Andy Lutomirski
Date: Fri Jul 25 2014 - 19:36:49 EST

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,

if (IS_ERR(vma)) {
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/