audit: allow audit code to satisfy getname requests from its names_list

Currently, if we call getname() on a userland string more than once,
we'll get multiple copies of the string and multiple audit_names
records.

Add a function that will allow the audit_names code to satisfy getname
requests using info from the audit_names list, avoiding a new allocation
and audit_names records.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 4 insertions, 0 deletions

diff --git a/fs/namei.c b/fs/namei.c
index ec638d27642f..5dbc3f836934 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -130,6 +130,10 @@ getname_flags(const char __user *filename, int flags, int *empty)
         char *kname;
         int len;
 
+        result = audit_reusename(filename);
+        if (result)
+                return result;
+
         /* FIXME: create dedicated slabcache? */
         result = kzalloc(sizeof(*result), GFP_KERNEL);
         if (unlikely(!result))