linux-kernel - [PATCH v2 2/5] x86: ia32_signal: introduce COPY_SEG

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Message-ID: <4922027A.4060805@ct.jp.nec.com>
Date:	Mon, 17 Nov 2008 15:47:06 -0800
From:	Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>
To:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
Cc:	linux-kernel@...r.kernel.org, xiyou.wangcong@...il.com
Subject: [PATCH v2 2/5] x86: ia32_signal: introduce COPY_SEG_STRICT

From: Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>

Impact: cleanup

Introduce COPY_SEG_STRICT for ia32_restore_sigcontext().

Signed-off-by: Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>
---
 arch/x86/ia32/ia32_signal.c |   12 ++++++++----
 1 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/arch/x86/ia32/ia32_signal.c b/arch/x86/ia32/ia32_signal.c
index a28790a..f74178e 100644
--- a/arch/x86/ia32/ia32_signal.c
+++ b/arch/x86/ia32/ia32_signal.c
@@ -201,6 +201,12 @@ struct rt_sigframe
 	err |= __get_user(regs->x, &sc->x);	\
 }
 
+#define COPY_SEG_STRICT(seg)	{			\
+		unsigned short tmp;			\
+		err |= __get_user(tmp, &sc->seg);	\
+		regs->seg = tmp | 3;			\
+}
+
 #define RELOAD_SEG(seg,mask)						\
 	{ unsigned int cur;						\
 	  unsigned short pre;						\
@@ -246,10 +252,8 @@ static int ia32_restore_sigcontext(struct pt_regs *regs,
 	COPY(dx); COPY(cx); COPY(ip);
 	/* Don't touch extended registers */
 
-	err |= __get_user(regs->cs, &sc->cs);
-	regs->cs |= 3;
-	err |= __get_user(regs->ss, &sc->ss);
-	regs->ss |= 3;
+	COPY_SEG_STRICT(cs);
+	COPY_SEG_STRICT(ss);
 
 	err |= __get_user(tmpflags, &sc->flags);
 	regs->flags = (regs->flags & ~FIX_EFLAGS) | (tmpflags & FIX_EFLAGS);
-- 
1.5.6

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