From 61eeaf511b19621324fea5e74b6bddfb26c82732 Mon Sep 17 00:00:00 2001
From: "Eric W. Biederman" <ebiederm@xmission.com>
Date: Thu, 18 Oct 2007 03:05:23 -0700
Subject: [PATCH] --- yaml --- r: 71144 b: refs/heads/master c:
 49a0c45833c9aa9852ba02c9df0f18029509d0a9 h: refs/heads/master v: v3

---
 [refs]                       |  2 +-
 trunk/include/linux/sysctl.h |  1 +
 trunk/kernel/sysctl.c        | 66 +++++++++++++++++++++++++-----------
 3 files changed, 48 insertions(+), 21 deletions(-)

diff --git a/[refs] b/[refs]
index b6a4069b9964..1eb2ed832cd1 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: d8217f076b73441dd3869c0c880df000655084cc
+refs/heads/master: 49a0c45833c9aa9852ba02c9df0f18029509d0a9
diff --git a/trunk/include/linux/sysctl.h b/trunk/include/linux/sysctl.h
index f73be4cd662e..5ca510b3cbe2 100644
--- a/trunk/include/linux/sysctl.h
+++ b/trunk/include/linux/sysctl.h
@@ -972,6 +972,7 @@ extern int do_sysctl_strategy (struct ctl_table *table,
 			       void __user *oldval, size_t __user *oldlenp,
 			       void __user *newval, size_t newlen);
 
+extern ctl_handler sysctl_data;
 extern ctl_handler sysctl_string;
 extern ctl_handler sysctl_intvec;
 extern ctl_handler sysctl_jiffies;
diff --git a/trunk/kernel/sysctl.c b/trunk/kernel/sysctl.c
index 73c84b6e7a35..88c8ea8f5e8c 100644
--- a/trunk/kernel/sysctl.c
+++ b/trunk/kernel/sysctl.c
@@ -1443,7 +1443,6 @@ int do_sysctl_strategy (struct ctl_table *table,
 			void __user *newval, size_t newlen)
 {
 	int op = 0, rc;
-	size_t len;
 
 	if (oldval)
 		op |= 004;
@@ -1464,25 +1463,10 @@ int do_sysctl_strategy (struct ctl_table *table,
 	/* If there is no strategy routine, or if the strategy returns
 	 * zero, proceed with automatic r/w */
 	if (table->data && table->maxlen) {
-		if (oldval && oldlenp) {
-			if (get_user(len, oldlenp))
-				return -EFAULT;
-			if (len) {
-				if (len > table->maxlen)
-					len = table->maxlen;
-				if(copy_to_user(oldval, table->data, len))
-					return -EFAULT;
-				if(put_user(len, oldlenp))
-					return -EFAULT;
-			}
-		}
-		if (newval && newlen) {
-			len = newlen;
-			if (len > table->maxlen)
-				len = table->maxlen;
-			if(copy_from_user(table->data, newval, len))
-				return -EFAULT;
-		}
+		rc = sysctl_data(table, name, nlen, oldval, oldlenp,
+				 newval, newlen);
+		if (rc < 0)
+			return rc;
 	}
 	return 0;
 }
@@ -2381,6 +2365,40 @@ int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
  * General sysctl support routines 
  */
 
+/* The generic sysctl data routine (used if no strategy routine supplied) */
+int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
+		void __user *oldval, size_t __user *oldlenp,
+		void __user *newval, size_t newlen)
+{
+	size_t len;
+
+	/* Get out of I don't have a variable */
+	if (!table->data || !table->maxlen)
+		return -ENOTDIR;
+
+	if (oldval && oldlenp) {
+		if (get_user(len, oldlenp))
+			return -EFAULT;
+		if (len) {
+			if (len > table->maxlen)
+				len = table->maxlen;
+			if (copy_to_user(oldval, table->data, len))
+				return -EFAULT;
+			if (put_user(len, oldlenp))
+				return -EFAULT;
+		}
+	}
+
+	if (newval && newlen) {
+		if (newlen > table->maxlen)
+			newlen = table->maxlen;
+
+		if (copy_from_user(table->data, newval, newlen))
+			return -EFAULT;
+	}
+	return 1;
+}
+
 /* The generic string strategy routine: */
 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
 		  void __user *oldval, size_t __user *oldlenp,
@@ -2569,6 +2587,13 @@ asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
 	return -ENOSYS;
 }
 
+int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
+		  void __user *oldval, size_t __user *oldlenp,
+		  void __user *newval, size_t newlen)
+{
+	return -ENOSYS;
+}
+
 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
 		  void __user *oldval, size_t __user *oldlenp,
 		  void __user *newval, size_t newlen)
@@ -2616,4 +2641,5 @@ EXPORT_SYMBOL(sysctl_intvec);
 EXPORT_SYMBOL(sysctl_jiffies);
 EXPORT_SYMBOL(sysctl_ms_jiffies);
 EXPORT_SYMBOL(sysctl_string);
+EXPORT_SYMBOL(sysctl_data);
 EXPORT_SYMBOL(unregister_sysctl_table);