linux-kernel - [RFC PATCH 02/43] ptrace: cleanup ptrace

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Date:	Fri, 27 Aug 2010 18:41:48 +0900
From:	Namhyung Kim <namhyung@...il.com>
To:	Roland McGrath <roland@...hat.com>,
	Oleg Nesterov <oleg@...hat.com>, Arnd Bergmann <arnd@...db.de>
Cc:	linux-kernel@...r.kernel.org
Subject: [RFC PATCH 02/43] ptrace: cleanup ptrace_request()

use new local variable to remove unnecesary casting, but it requires
put_user() to be changed to copy_to_user().

Signed-off-by: Namhyung Kim <namhyung@...il.com>
---
 kernel/ptrace.c |   13 +++++++------
 1 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index f838afe..1084bef 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -563,6 +563,7 @@ int ptrace_request(struct task_struct *child, long request,
 {
 	int ret = -EIO;
 	siginfo_t siginfo;
+	void __user *datap = (void __user *) data;
 
 	switch (request) {
 	case PTRACE_PEEKTEXT:
@@ -579,19 +580,19 @@ int ptrace_request(struct task_struct *child, long request,
 		ret = ptrace_setoptions(child, data);
 		break;
 	case PTRACE_GETEVENTMSG:
-		ret = put_user(child->ptrace_message, (unsigned long __user *) data);
+		ret = copy_to_user(datap, &child->ptrace_message,
+				   sizeof (child->ptrace_message)) ?
+			-EFAULT : 0;
 		break;
 
 	case PTRACE_GETSIGINFO:
 		ret = ptrace_getsiginfo(child, &siginfo);
 		if (!ret)
-			ret = copy_siginfo_to_user((siginfo_t __user *) data,
-						   &siginfo);
+			ret = copy_siginfo_to_user(datap, &siginfo);
 		break;
 
 	case PTRACE_SETSIGINFO:
-		if (copy_from_user(&siginfo, (siginfo_t __user *) data,
-				   sizeof siginfo))
+		if (copy_from_user(&siginfo, datap, sizeof siginfo))
 			ret = -EFAULT;
 		else
 			ret = ptrace_setsiginfo(child, &siginfo);
@@ -622,7 +623,7 @@ int ptrace_request(struct task_struct *child, long request,
 		}
 		mmput(mm);
 
-		ret = put_user(tmp, (unsigned long __user *) data);
+		ret = copy_to_user(datap, &tmp, sizeof tmp) ? -EFAULT : 0;
 		break;
 	}
 #endif
-- 
1.7.2.2

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