linux-kernel - [PATCH 1/4] sysctl: clean up char buffer arguments

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Date:	Thu,  1 May 2014 14:26:34 -0700
From:	Kees Cook <keescook@...omium.org>
To:	linux-kernel@...r.kernel.org
Cc:	Kees Cook <keescook@...omium.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Randy Dunlap <rdunlap@...radead.org>,
	Ingo Molnar <mingo@...nel.org>, Rik van Riel <riel@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Mel Gorman <mgorman@...e.de>,
	Aaron Tomlin <atomlin@...hat.com>,
	Li Zefan <lizefan@...wei.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Ryan Mallon <rmallon@...il.com>,
	Wanpeng Li <liwanp@...ux.vnet.ibm.com>,
	Dario Faggioli <raistlin@...ux.it>, Jens Axboe <axboe@...com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Michael Ellerman <michael@...erman.id.au>,
	linux-doc@...r.kernel.org
Subject: [PATCH 1/4] sysctl: clean up char buffer arguments

The char buffer arguments are needlessly cast in weird places. Clean it up
so things are easier to read.

Signed-off-by: Kees Cook <keescook@...omium.org>
---
 kernel/sysctl.c |   14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 74f5b580fe34..e7ff80a73c44 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -1698,8 +1698,8 @@ int __init sysctl_init(void)
 
 #ifdef CONFIG_PROC_SYSCTL
 
-static int _proc_do_string(void* data, int maxlen, int write,
-			   void __user *buffer,
+static int _proc_do_string(char *data, int maxlen, int write,
+			   char __user *buffer,
 			   size_t *lenp, loff_t *ppos)
 {
 	size_t len;
@@ -1725,7 +1725,7 @@ static int _proc_do_string(void* data, int maxlen, int write,
 			len = maxlen-1;
 		if(copy_from_user(data, buffer, len))
 			return -EFAULT;
-		((char *) data)[len] = 0;
+		data[len] = 0;
 		*ppos += *lenp;
 	} else {
 		len = strlen(data);
@@ -1743,10 +1743,10 @@ static int _proc_do_string(void* data, int maxlen, int write,
 		if (len > *lenp)
 			len = *lenp;
 		if (len)
-			if(copy_to_user(buffer, data, len))
+			if (copy_to_user(buffer, data, len))
 				return -EFAULT;
 		if (len < *lenp) {
-			if(put_user('\n', ((char __user *) buffer) + len))
+			if (put_user('\n', buffer + len))
 				return -EFAULT;
 			len++;
 		}
@@ -1776,8 +1776,8 @@ static int _proc_do_string(void* data, int maxlen, int write,
 int proc_dostring(struct ctl_table *table, int write,
 		  void __user *buffer, size_t *lenp, loff_t *ppos)
 {
-	return _proc_do_string(table->data, table->maxlen, write,
-			       buffer, lenp, ppos);
+	return _proc_do_string((char *)(table->data), table->maxlen, write,
+			       (char __user *)buffer, lenp, ppos);
 }
 
 static size_t proc_skip_spaces(char **buf)
-- 
1.7.9.5

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