From: Oleg Nesterov <oleg@redhat.com>
Date: Mon, 9 Apr 2012 19:03:50 +0000 (+0200)
Subject: cred: copy_process() should clear child->replacement_session_keyring
X-Git-Tag: v3.4-rc3~45
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=79549c6dfda0603dba9a70a53467ce62d9335c33;p=pandora-kernel.git

cred: copy_process() should clear child->replacement_session_keyring

keyctl_session_to_parent(task) sets ->replacement_session_keyring,
it should be processed and cleared by key_replace_session_keyring().

However, this task can fork before it notices TIF_NOTIFY_RESUME and
the new child gets the bogus ->replacement_session_keyring copied by
dup_task_struct(). This is obviously wrong and, if nothing else, this
leads to put_cred(already_freed_cred).

change copy_creds() to clear this member. If copy_process() fails
before this point the wrong ->replacement_session_keyring doesn't
matter, exit_creds() won't be called.

Cc: <stable@vger.kernel.org>
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: David Howells <dhowells@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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