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https://github.com/darlinghq/darling-xnu.git
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142 lines
4.5 KiB
C
142 lines
4.5 KiB
C
/*
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* Copyright (c) 2008 Apple Inc. All rights reserved.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
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*
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* This file contains Original Code and/or Modifications of Original Code
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* as defined in and that are subject to the Apple Public Source License
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* Version 2.0 (the 'License'). You may not use this file except in
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* compliance with the License. The rights granted to you under the License
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* may not be used to create, or enable the creation or redistribution of,
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* unlawful or unlicensed copies of an Apple operating system, or to
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* circumvent, violate, or enable the circumvention or violation of, any
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* terms of an Apple operating system software license agreement.
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*
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* Please obtain a copy of the License at
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* http://www.opensource.apple.com/apsl/ and read it before using this file.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
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* Please see the License for the specific language governing rights and
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* limitations under the License.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
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*/
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#include <mach/mach_types.h>
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#include <mach/notify.h>
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#include <ipc/ipc_port.h>
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#include <kern/ipc_kobject.h>
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#include <kern/audit_sessionport.h>
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#include <libkern/OSAtomic.h>
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#if CONFIG_AUDIT
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/*
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* audit_session_mksend
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*
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* Description: Obtain a send right for given audit session.
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*
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* Parameters: *aia_p Audit session information to assosiate with
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* the new port.
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* *sessionport Pointer to the current session port. This may
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* actually be set to IPC_PORT_NULL.
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*
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* Returns: !NULL Resulting send right.
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* NULL Failed to allocate port (due to lack of memory
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* resources).
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*
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* Assumptions: Caller holds a reference on the session during the call.
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* If there were no outstanding send rights against the port,
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* hold a reference on the session and arm a new no-senders
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* notification to determine when to release that reference.
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* Otherwise, by creating an additional send right, we share
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* the port's reference until all send rights go away.
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*/
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ipc_port_t
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audit_session_mksend(struct auditinfo_addr *aia_p, ipc_port_t *sessionport)
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{
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audit_session_aiaref(aia_p);
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if (!ipc_kobject_make_send_lazy_alloc_port(sessionport,
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(ipc_kobject_t)aia_p, IKOT_AU_SESSIONPORT, IPC_KOBJECT_ALLOC_NONE, false, 0)) {
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audit_session_aiaunref(aia_p);
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}
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return *sessionport;
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}
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/*
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* audit_session_porttoaia
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*
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* Description: Obtain the audit session info associated with the given port.
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*
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* Parameters: port A Mach port.
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*
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* Returns: NULL The given Mach port did not reference audit
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* session info.
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* !NULL The audit session info that is associated with
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* the Mach port.
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*
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* Notes: The caller must have a reference on the sessionport.
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*/
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struct auditinfo_addr *
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audit_session_porttoaia(ipc_port_t port)
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{
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struct auditinfo_addr *aia_p = NULL;
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if (IP_VALID(port)) {
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ip_lock(port);
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if (IKOT_AU_SESSIONPORT == ip_kotype(port)) {
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require_ip_active(port);
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aia_p = (struct auditinfo_addr *)ip_get_kobject(port);
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}
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ip_unlock(port);
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}
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return aia_p;
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}
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/*
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* audit_session_nosenders
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*
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* Description: Handle a no-senders notification for a sessionport.
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*
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* Parameters: msg A Mach no-senders notification message.
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*
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* Notes: It is possible that new send rights are created after a
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* no-senders notification has been sent, but they will be protected
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* by another aia reference.
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*/
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void
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audit_session_nosenders(mach_msg_header_t *msg)
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{
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mach_no_senders_notification_t *notification = (void *)msg;
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ipc_port_t port = notification->not_header.msgh_remote_port;
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struct auditinfo_addr *port_aia_p = NULL;
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require_ip_active(port);
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assert(IKOT_AU_SESSIONPORT == ip_kotype(port));
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port_aia_p = (struct auditinfo_addr *)ip_get_kobject(port);
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assert(NULL != port_aia_p);
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audit_session_aiaunref(port_aia_p);
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}
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void
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audit_session_portdestroy(ipc_port_t *sessionport)
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{
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ipc_port_t port = *sessionport;
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if (IP_VALID(port)) {
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require_ip_active(port);
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assert(IKOT_AU_SESSIONPORT == ip_kotype(port));
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ipc_kobject_set_atomically(port, IKO_NULL, IKOT_NONE);
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ipc_port_dealloc_kernel(port);
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*sessionport = IP_NULL;
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}
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}
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#endif /* CONFIG_AUDIT */
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