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lwp_update_creds(): acquire the kernel lock to avoid potential deadlock.

This commit is contained in:
ad 2006-12-23 08:39:47 +00:00
parent d635d897fb
commit 384215762e
1 changed files with 4 additions and 2 deletions
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6
sys/kern/kern_lwp.c
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@ -1,4 +1,4 @@
/* $NetBSD: kern_lwp.c,v 1.50 2006/12/22 08:04:01 ad Exp $ */ /* $NetBSD: kern_lwp.c,v 1.51 2006/12/23 08:39:47 ad Exp $ */
/*- /*-
* Copyright (c) 2001 The NetBSD Foundation, Inc. * Copyright (c) 2001 The NetBSD Foundation, Inc.
@ -37,7 +37,7 @@
*/ */
#include <sys/cdefs.h> #include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: kern_lwp.c,v 1.50 2006/12/22 08:04:01 ad Exp $"); __KERNEL_RCSID(0, "$NetBSD: kern_lwp.c,v 1.51 2006/12/23 08:39:47 ad Exp $");
#include "opt_multiprocessor.h" #include "opt_multiprocessor.h"
@ -755,12 +755,14 @@ lwp_update_creds(struct lwp *l)
p = l->l_proc; p = l->l_proc;
oc = l->l_cred; oc = l->l_cred;
KERNEL_PROC_LOCK(l);
simple_lock(&p->p_lock); simple_lock(&p->p_lock);
kauth_cred_hold(p->p_cred); kauth_cred_hold(p->p_cred);
l->l_cred = p->p_cred; l->l_cred = p->p_cred;
simple_unlock(&p->p_lock); simple_unlock(&p->p_lock);
if (oc != NULL) if (oc != NULL)
kauth_cred_free(oc); kauth_cred_free(oc);
KERNEL_PROC_UNLOCK(l);
} }
/* /*