jffs2: Add missing capability check for listing trusted xattrs

The vfs checks if a task has the appropriate access for get and set
operations, but it cannot do that for the list operation; the file system
must check for that itself.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: linux-mtd@lists.infradead.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Andreas Gruenbacher 2015-10-04 19:18:50 +02:00 коммит произвёл Al Viro
Родитель e282fb7f3b
Коммит bf781714b3
1 изменённых файлов: 3 добавлений и 0 удалений

Просмотреть файл

@ -39,6 +39,9 @@ static size_t jffs2_trusted_listxattr(struct dentry *dentry, char *list,
{
size_t retlen = XATTR_TRUSTED_PREFIX_LEN + name_len + 1;
if (!capable(CAP_SYS_ADMIN))
return 0;
if (list && retlen<=list_size) {
strcpy(list, XATTR_TRUSTED_PREFIX);
strcpy(list + XATTR_TRUSTED_PREFIX_LEN, name);