vfs: ensure page symlinks are NUL-terminated

On-disk data corruption could cause a page link to have its i_size set
to PAGE_SIZE (or a multiple thereof) and its contents all non-NUL.
NUL-terminate the link name to ensure this doesn't cause further
problems for the kernel.

Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Duane Griffin <duaneg@dghda.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/fs/namei.c b/fs/namei.c
index ab441af..9ed5e28 100644 (file)
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -2786,13 +2786,16 @@ int vfs_follow_link(struct nameidata *nd, const char *link)
 /* get the link contents into pagecache */
 static char *page_getlink(struct dentry * dentry, struct page **ppage)
 {
-       struct page * page;
+       char *kaddr;
+       struct page *page;
        struct address_space *mapping = dentry->d_inode->i_mapping;
        page = read_mapping_page(mapping, 0, NULL);
        if (IS_ERR(page))
                return (char*)page;
        *ppage = page;
-       return kmap(page);
+       kaddr = kmap(page);
+       nd_terminate_link(kaddr, dentry->d_inode->i_size, PAGE_SIZE - 1);
+       return kaddr;
 }
 
 int page_readlink(struct dentry *dentry, char __user *buffer, int buflen)