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: firefly_0821_release~7541^2~1403
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=a27f3e06be07cd3719f8c42092de3ebfc9202923;p=firefly-linux-kernel-4.4.55.git

cred: copy_process() should clear child->replacement_session_keyring

commit 79549c6dfda0603dba9a70a53467ce62d9335c33 upstream.

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.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: David Howells <dhowells@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/kernel/cred.c b/kernel/cred.c
index 174fa84eca30..3a55ea4fa983 100644
--- a/kernel/cred.c
+++ b/kernel/cred.c
@@ -385,6 +385,8 @@ int copy_creds(struct task_struct *p, unsigned long clone_flags)
 	struct cred *new;
 	int ret;
 
+	p->replacement_session_keyring = NULL;
+
 	if (
 #ifdef CONFIG_KEYS
 		!p->cred->thread_keyring &&