linux-kernel - [PATCH v2 3/3] MIPS: set stack/data protection as non-executable

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Date:	Thu, 9 Oct 2014 13:00:26 -0700
From:	Leonid Yegoshin <Leonid.Yegoshin@...tec.com>
To:	<linux-mips@...ux-mips.org>, <Zubair.Kakakhel@...tec.com>,
	<geert+renesas@...der.be>, <david.daney@...ium.com>,
	<peterz@...radead.org>, <paul.gortmaker@...driver.com>,
	<davidlohr@...com>, <macro@...ux-mips.org>, <chenhc@...ote.com>,
	<richard@....at>, <zajec5@...il.com>, <james.hogan@...tec.com>,
	<keescook@...omium.org>, <alex@...x-smith.me.uk>,
	<tglx@...utronix.de>, <blogic@...nwrt.org>,
	<jchandra@...adcom.com>, <paul.burton@...tec.com>,
	<qais.yousef@...tec.com>, <linux-kernel@...r.kernel.org>,
	<ralf@...ux-mips.org>, <markos.chandras@...tec.com>,
	<dengcheng.zhu@...tec.com>, <manuel.lauss@...il.com>,
	<akpm@...ux-foundation.org>, <lars.persson@...s.com>
Subject: [PATCH v2 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 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/mips/include/asm/page.h b/arch/mips/include/asm/page.h
index 3be8180..d49ba81 100644
--- a/arch/mips/include/asm/page.h
+++ b/arch/mips/include/asm/page.h
@@ -230,7 +230,7 @@ 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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