keys: kill task_struct->replacement_session_keyring

Kill the no longer used task_struct->replacement_session_keyring, update
copy_creds() and exit_creds().

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: David Howells <dhowells@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Richard Kuo <rkuo@codeaurora.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Alexander Gordeev <agordeev@redhat.com>
Cc: Chris Zankel <chris@zankel.net>
Cc: David Smith <dsmith@redhat.com>
Cc: "Frank Ch. Eigler" <fche@redhat.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Larry Woodman <lwoodman@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/include/linux/sched.h b/include/linux/sched.h
index da013853a62266c1c8e5532f650428d72dd43098..17c6c929ee9421084484d31f17a19dafad142944 100644 (file)
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1357,8 +1357,6 @@ struct task_struct {
                                         * credentials (COW) */
        const struct cred __rcu *cred;  /* effective (overridable) subjective task
                                         * credentials (COW) */
-       struct cred *replacement_session_keyring; /* for KEYCTL_SESSION_TO_PARENT */
-
        char comm[TASK_COMM_LEN]; /* executable name excluding path
                                     - access with [gs]et_task_comm (which lock
                                       it with task_lock())

diff --git a/kernel/cred.c b/kernel/cred.c
index 430557ea488f3625243455afcdd6b2f9f481ac19..de728ac50d821b9f38340534a4ba6202137d55a2 100644 (file)
--- a/kernel/cred.c
+++ b/kernel/cred.c
@@ -207,13 +207,6 @@ void exit_creds(struct task_struct *tsk)
        validate_creds(cred);
        alter_cred_subscribers(cred, -1);
        put_cred(cred);
-
-       cred = (struct cred *) tsk->replacement_session_keyring;
-       if (cred) {
-               tsk->replacement_session_keyring = NULL;
-               validate_creds(cred);
-               put_cred(cred);
-       }
 }
 
 /**
@@ -396,8 +389,6 @@ 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 &&