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

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Message-ID: <20141004031739.28569.12863.stgit@linux-yegoshin>
Date:	Fri, 3 Oct 2014 20:17:39 -0700
From:	Leonid Yegoshin <Leonid.Yegoshin@...tec.com>
To:	<linux-mips@...ux-mips.org>, <Zubair.Kakakhel@...tec.com>,
	<david.daney@...ium.com>, <peterz@...radead.org>,
	<paul.gortmaker@...driver.com>, <davidlohr@...com>,
	<macro@...ux-mips.org>, <chenhc@...ote.com>, <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>, <manuel.lauss@...il.com>,
	<akpm@...ux-foundation.org>, <lars.persson@...s.com>
Subject: [PATCH 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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