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Re: [PATCH 1/1] userns: unshare_userns(&cred) should not populate cred on failure
From: Andy Lutomirski <luto () amacapital net>
Date: Tue, 6 Aug 2013 11:14:24 -0700

On Tue, Aug 6, 2013 at 10:38 AM, Oleg Nesterov <oleg () redhat com> wrote:
unshare_userns(new_cred) does *new_cred = prepare_creds() before
create_user_ns() which can fail. However, the caller expects that
it doesn't need to take care of new_cred if unshare_userns() fails.

We could change the single caller, sys_unshare(), but I think it
would be more clean to avoid the side effects on failure, so with
this patch unshare_userns() does put_cred() itself and initializes
*new_cred only if create_user_ns() succeeeds.

Cc: stable () vger kernel org
Signed-off-by: Oleg Nesterov <oleg () redhat com>
---
 kernel/user_namespace.c |   13 +++++++++----
 1 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/kernel/user_namespace.c b/kernel/user_namespace.c
index d8c30db..6e50a44 100644
--- a/kernel/user_namespace.c
+++ b/kernel/user_namespace.c
@@ -105,16 +105,21 @@ int create_user_ns(struct cred *new)
 int unshare_userns(unsigned long unshare_flags, struct cred **new_cred)
 {
        struct cred *cred;
+       int err = -ENOMEM;

        if (!(unshare_flags & CLONE_NEWUSER))
                return 0;

        cred = prepare_creds();
-       if (!cred)
-               return -ENOMEM;
+       if (cred) {
+               err = create_user_ns(cred);
+               if (err)
+                       put_cred(cred);
+               else
+                       *new_cred = cred;
+       }

-       *new_cred = cred;
-       return create_user_ns(cred);
+       return err;
 }

 void free_user_ns(struct user_namespace *ns)
--
1.5.5.1



Reviewed-by: Andy Lutomirski <luto () amacapital net>


-- 
Andy Lutomirski
AMA Capital Management, LLC


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