[PATCH] sysctl: allow sysctl_perm to be called from outside of sysctl.c

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/sysctl.h

@@ -925,8 +925,10 @@ enum
 #include <linux/list.h>
 
 /* For the /proc/sys support */
+struct ctl_table;
 extern struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev);
 extern void sysctl_head_finish(struct ctl_table_header *prev);
+extern int sysctl_perm(struct ctl_table *table, int op);
 
 extern void sysctl_init(void);
 

kernel/sysctl.c

@@ -1157,7 +1157,7 @@ asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
 #endif /* CONFIG_SYSCTL_SYSCALL */
 
 /*
- * ctl_perm does NOT grant the superuser all rights automatically, because
+ * sysctl_perm does NOT grant the superuser all rights automatically, because
  * some sysctl variables are readonly even to root.
  */
 
@@ -1172,7 +1172,7 @@ static int test_perm(int mode, int op)
 	return -EACCES;
 }
 
-static inline int ctl_perm(ctl_table *table, int op)
+int sysctl_perm(ctl_table *table, int op)
 {
 	int error;
 	error = security_sysctl(table, op);
@@ -1199,7 +1199,7 @@ repeat:
 		if (n == table->ctl_name) {
 			int error;
 			if (table->child) {
-				if (ctl_perm(table, 001))
+				if (sysctl_perm(table, 001))
 					return -EPERM;
 				name++;
 				nlen--;
@@ -1228,7 +1228,7 @@ int do_sysctl_strategy (ctl_table *table,
 		op |= 004;
 	if (newval) 
 		op |= 002;
-	if (ctl_perm(table, op))
+	if (sysctl_perm(table, op))
 		return -EPERM;
 
 	if (table->strategy) {
@@ -1498,7 +1498,7 @@ static ssize_t do_rw_proc(int write, struct file * file, char __user * buf,
 			goto out;
 		error = -EPERM;
 		op = (write ? 002 : 004);
-		if (ctl_perm(table, op))
+		if (sysctl_perm(table, op))
 			goto out;
 		
 		/* careful: calling conventions are nasty here */