linux-kernel - [135/165] Set cred->user_ns in key_replace_session

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Date:	Wed, 01 Jun 2011 17:11:45 +0900
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	"Serge E. Hallyn" <serge.hallyn@...onical.com>,
	David Howells <dhowells@...hat.com>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [135/165] Set cred->user_ns in key_replace_session_keyring

2.6.39-stable review patch.  If anyone has any objections, please let us know.

------------------
Content-Length: 1072
Lines: 31

From: "Serge E. Hallyn" <serge@...lyn.com>

commit f7285b5d631fd6096b11c6af0058ed3a2b30ef4e upstream.

Since this cred was not created with copy_creds(), it needs to get
initialized.  Otherwise use of syscall(__NR_keyctl, KEYCTL_SESSION_TO_PARENT);
can lead to a NULL deref.  Thanks to Robert for finding this.

But introduced by commit 47a150edc2a ("Cache user_ns in struct cred").

Signed-off-by: Serge E. Hallyn <serge.hallyn@...onical.com>
Reported-by: Robert Święcki <robert@...ecki.net>
Cc: David Howells <dhowells@...hat.com>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 security/keys/process_keys.c |    1 +
 1 file changed, 1 insertion(+)

--- a/security/keys/process_keys.c
+++ b/security/keys/process_keys.c
@@ -845,6 +845,7 @@ void key_replace_session_keyring(void)
 	new-> sgid	= old-> sgid;
 	new->fsgid	= old->fsgid;
 	new->user	= get_uid(old->user);
+	new->user_ns	= new->user->user_ns;
 	new->group_info	= get_group_info(old->group_info);

 	new->securebits	= old->securebits;

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