linux-kernel - [PATCH RESEND v3 04/24] ptrace: cleanup arch

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Date:	Thu, 30 Sep 2010 18:27:39 +0900
From:	Namhyung Kim <namhyung@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Roland McGrath <roland@...hat.com>,
	Oleg Nesterov <oleg@...hat.com>, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: [PATCH RESEND v3 04/24] ptrace: cleanup arch_ptrace() on x86

Remove checking @addr less than 0 because @addr is now unsigned and
use new udescp variable in order to remove unnecessary castings.

Signed-off-by: Namhyung Kim <namhyung@...il.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: "H. Peter Anvin" <hpa@...or.com>
---
 arch/x86/kernel/ptrace.c |   13 +++++--------
 1 files changed, 5 insertions(+), 8 deletions(-)

diff --git a/arch/x86/kernel/ptrace.c b/arch/x86/kernel/ptrace.c
index 1a7ca04..6167a0c 100644
--- a/arch/x86/kernel/ptrace.c
+++ b/arch/x86/kernel/ptrace.c
@@ -806,6 +806,7 @@ long arch_ptrace(struct task_struct *child, long request,
 {
 	int ret;
 	unsigned long __user *datap = (unsigned long __user *)data;
+	struct user_desc __user *udescp = (struct user_desc __user *)data;
 
 	switch (request) {
 	/* read the word at location addr in the USER area. */
@@ -813,8 +814,7 @@ long arch_ptrace(struct task_struct *child, long request,
 		unsigned long tmp;
 
 		ret = -EIO;
-		if ((addr & (sizeof(data) - 1)) || addr < 0 ||
-		    addr >= sizeof(struct user))
+		if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user))
 			break;
 
 		tmp = 0;  /* Default return condition */
@@ -831,8 +831,7 @@ long arch_ptrace(struct task_struct *child, long request,
 
 	case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
 		ret = -EIO;
-		if ((addr & (sizeof(data) - 1)) || addr < 0 ||
-		    addr >= sizeof(struct user))
+		if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user))
 			break;
 
 		if (addr < sizeof(struct user_regs_struct))
@@ -891,15 +890,13 @@ long arch_ptrace(struct task_struct *child, long request,
 	case PTRACE_GET_THREAD_AREA:
 		if ((int) addr < 0)
 			return -EIO;
-		ret = do_get_thread_area(child, addr,
-					 (struct user_desc __user *) data);
+		ret = do_get_thread_area(child, addr, udescp);
 		break;
 
 	case PTRACE_SET_THREAD_AREA:
 		if ((int) addr < 0)
 			return -EIO;
-		ret = do_set_thread_area(child, addr,
-					 (struct user_desc __user *) data, 0);
+		ret = do_set_thread_area(child, addr, udescp, 0);
 		break;
 #endif
 
-- 
1.7.2.2

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