linux-kernel - [PATCH] x86,vdso: Set VM

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Message-Id: <e4c8bf4bc2725bda22c4a4b7d0c82adcd8f8d9b8.1406330779.git.luto@amacapital.net>
Date:	Fri, 25 Jul 2014 16:27:01 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	hpa@...or.com, x86@...nel.org, linux-kernel@...r.kernel.org
Cc:	Andy Lutomirski <luto@...capital.net>
Subject: [PATCH] x86,vdso: Set VM_MAYREAD for the vvar vma

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@...tor.com>
Signed-off-by: Andy Lutomirski <luto@...capital.net>
---
 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)) {
-- 
1.9.3

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