commit 96840aa00a031069a136ec4c55d0bdd09ac6d3a7
author Davi Arnaut <davi.arnaut@gmail.com> Fri Mar 24 03:18:42 2006 -0800
committer Linus Torvalds <torvalds@g5.osdl.org> Fri Mar 24 07:33:31 2006 -0800
tree f93592ca47f2412aa0cce3ce4c116d1678a42239
parent 6687a97d4041f996f725902d2990e5de6ef5cbe5

[PATCH] strndup_user()

This patch series creates a strndup_user() function to easy copying C strings
from userspace.  Also we avoid common pitfalls like userspace modifying the
final \0 after the strlen_user().

Signed-off-by: Davi Arnaut <davi.arnaut@gmail.com>
Cc: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

include/linux/string.h

diff --git a/include/linux/string.h b/include/linux/string.h
index 369be32..dee2214 100644
--- a/include/linux/string.h
+++ b/include/linux/string.h
@@ -18,6 +18,8 @@
 extern __kernel_size_t strspn(const char *,const char *);
 extern __kernel_size_t strcspn(const char *,const char *);
 
+extern char *strndup_user(const char __user *, long);
+
 /*
  * Include machine specific inline routines
  */