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-rw-r--r--fs/namei.c6
-rw-r--r--include/linux/fcntl.h1
2 files changed, 5 insertions, 2 deletions
diff --git a/fs/namei.c b/fs/namei.c
index bb4a3e4..c784e8b 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -2243,14 +2243,16 @@ asmlinkage long sys_linkat(int olddfd, const char __user *oldname,
int error;
char * to;
- if (flags != 0)
+ if ((flags & ~AT_SYMLINK_FOLLOW) != 0)
return -EINVAL;
to = getname(newname);
if (IS_ERR(to))
return PTR_ERR(to);
- error = __user_walk_fd(olddfd, oldname, 0, &old_nd);
+ error = __user_walk_fd(olddfd, oldname,
+ flags & AT_SYMLINK_FOLLOW ? LOOKUP_FOLLOW : 0,
+ &old_nd);
if (error)
goto exit;
error = do_path_lookup(newdfd, to, LOOKUP_PARENT, &nd);
diff --git a/include/linux/fcntl.h b/include/linux/fcntl.h
index c52a637..996f561 100644
--- a/include/linux/fcntl.h
+++ b/include/linux/fcntl.h
@@ -29,6 +29,7 @@
#define AT_SYMLINK_NOFOLLOW 0x100 /* Do not follow symbolic links. */
#define AT_REMOVEDIR 0x200 /* Remove directory instead of
unlinking file. */
+#define AT_SYMLINK_FOLLOW 0x400 /* Follow symbolic links. */
#ifdef __KERNEL__
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