linux-kernel - [PATCH v4 3/3] MIPS: set stack/data protection as non-executable

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Date:	Wed, 5 Aug 2015 16:49:36 -0700
From:	Leonid Yegoshin <Leonid.Yegoshin@...tec.com>
To:	<daniel.sanders@...tec.com>, <linux-mips@...ux-mips.org>,
	<cernekee@...il.com>, <Zubair.Kakakhel@...tec.com>,
	<geert+renesas@...der.be>, <david.daney@...ium.com>,
	<peterz@...radead.org>, <heiko.carstens@...ibm.com>,
	<paul.gortmaker@...driver.com>, <behanw@...verseincode.com>,
	<macro@...ux-mips.org>, <cl@...ux.com>, <pkarat@...sta.com>,
	<linux@...ck-us.net>, <tkhai@...dex.ru>, <james.hogan@...tec.com>,
	<alexinbeijing@...il.com>, <rusty@...tcorp.com.au>,
	<Steven.Hill@...tec.com>, <lars.persson@...s.com>,
	<aleksey.makarov@...iga.com>, <paul.burton@...tec.com>,
	<linux-kernel@...r.kernel.org>, <ralf@...ux-mips.org>,
	<luto@...capital.net>, <dahi@...ux.vnet.ibm.com>,
	<markos.chandras@...tec.com>, <eunb.song@...sung.com>,
	<kumba@...too.org>
Subject: [PATCH v4 3/3] MIPS: set stack/data protection as non-executable

This is a last step of 3 patches which shift FPU emulation out of
stack into protected area. So, it disables a default executable stack.

Additionally, it sets a default data area non-executable protection.

Signed-off-by: Leonid Yegoshin <Leonid.Yegoshin@...tec.com>
---
 arch/mips/include/asm/page.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/mips/include/asm/page.h b/arch/mips/include/asm/page.h
index 89dd7fed1a57..0b6cec4a1b80 100644
--- a/arch/mips/include/asm/page.h
+++ b/arch/mips/include/asm/page.h
@@ -228,7 +228,7 @@ extern int __virt_addr_valid(const volatile void *kaddr);
 #define virt_addr_valid(kaddr)						\
 	__virt_addr_valid((const volatile void *) (kaddr))
 
-#define VM_DATA_DEFAULT_FLAGS	(VM_READ | VM_WRITE | VM_EXEC | \
+#define VM_DATA_DEFAULT_FLAGS	(VM_READ | VM_WRITE | \
 				 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 
 #define UNCAC_ADDR(addr)	((addr) - PAGE_OFFSET + UNCAC_BASE)

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