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NetBSD/sys/compat/mach/mach_message.c

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/* $NetBSD: mach_message.c,v 1.47 2005/12/11 12:20:20 christos Exp $ */
/*-
* Copyright (c) 2002-2003 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Emmanuel Dreyfus
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: mach_message.c,v 1.47 2005/12/11 12:20:20 christos Exp $");
#include "opt_ktrace.h"
#include "opt_compat_mach.h" /* For COMPAT_MACH in <sys/ktrace.h> */
#include "opt_compat_darwin.h"
#include <sys/types.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/signal.h>
#include <sys/proc.h>
#include <sys/kernel.h>
#include <sys/queue.h>
#include <sys/malloc.h>
#include <sys/pool.h>
#ifdef KTRACE
#include <sys/ktrace.h>
#endif
#include <uvm/uvm_extern.h>
#include <uvm/uvm_map.h>
#include <compat/mach/mach_types.h>
#include <compat/mach/mach_message.h>
#include <compat/mach/mach_port.h>
#include <compat/mach/mach_exec.h>
#include <compat/mach/mach_clock.h>
#include <compat/mach/mach_syscallargs.h>
#ifdef COMPAT_DARWIN
#include <compat/darwin/darwin_exec.h>
#endif
/* Mach message pool */
static struct pool mach_message_pool;
static inline
int mach_msg_send(struct lwp *, mach_msg_header_t *, int *, size_t);
static inline int mach_msg_recv(struct lwp *, mach_msg_header_t *,
int, size_t, unsigned int, mach_port_t);
static inline
struct lwp *mach_get_target_task(struct lwp *, struct mach_port *);
static inline void mach_drop_rights(struct mach_right *, int);
static inline
void mach_trade_rights(struct lwp *, struct lwp *, mach_port_t *, int);
static inline
int mach_trade_rights_complex(struct lwp *, struct mach_message *);
int
mach_sys_msg_overwrite_trap(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct mach_sys_msg_overwrite_trap_args /* {
syscallarg(mach_msg_header_t *) msg;
syscallarg(mach_msg_option_t) option;
syscallarg(mach_msg_size_t) send_size;
syscallarg(mach_msg_size_t) rcv_size;
syscallarg(mach_port_name_t) rcv_name;
syscallarg(mach_msg_timeout_t) timeout;
syscallarg(mach_port_name_t) notify;
syscallarg(mach_msg_header_t *) rcv_msg;
syscallarg(mach_msg_size_t) scatter_list_size;
} */ *uap = v;
size_t send_size, recv_size;
mach_msg_header_t *msg;
int opt;
*retval = MACH_MSG_SUCCESS;
send_size = SCARG(uap, send_size);
recv_size = SCARG(uap, rcv_size);
opt = SCARG(uap, option);
/* XXX not safe enough: lots of big messages will kill us */
if (send_size > MACH_MAX_MSG_LEN) {
*retval = MACH_SEND_TOO_LARGE;
return 0;
}
if (recv_size > MACH_MAX_MSG_LEN) {
*retval = MACH_RCV_TOO_LARGE;
return 0;
}
/*
* Two options: receive or send. If both are
* set, we must send, and then receive. If
* send fail, then we skip recieve.
*/
msg = SCARG(uap, msg);
if (opt & MACH_SEND_MSG)
*retval = mach_msg_send(l, msg, &opt, send_size);
if ((opt & MACH_RCV_MSG) && (*retval == MACH_MSG_SUCCESS)) {
/*
* Find a buffer for the reply.
*/
if (SCARG(uap, rcv_msg) != NULL)
msg = SCARG(uap, rcv_msg);
else if (SCARG(uap, msg) != NULL)
msg = SCARG(uap, msg);
else {
*retval = MACH_RCV_INVALID_DATA;
return 0;
}
*retval = mach_msg_recv(l, msg, opt, recv_size,
SCARG(uap, timeout), SCARG(uap, rcv_name));
}
return 0;
}
/*
* Send a Mach message. This returns a Mach message error code.
*/
static inline int
mach_msg_send(l, msg, option, send_size)
struct lwp *l;
mach_msg_header_t *msg;
int *option;
size_t send_size;
{
struct mach_emuldata *med;
struct mach_port *mp;
struct proc *p = l->l_proc;
mach_msg_header_t *sm;
struct mach_service *srv;
mach_port_t ln;
mach_port_t rn;
struct mach_right *lr = NULL;
struct mach_right *rr;
int rights;
int bits;
int ret;
size_t reply_size;
int error = 0;
if (msg == NULL)
return MACH_SEND_INVALID_DATA;
/*
* Allocate memory for the message and its reply,
* and copy the whole message in the kernel.
*/
sm = malloc(send_size, M_EMULDATA, M_WAITOK);
if ((error = copyin(msg, sm, send_size)) != 0) {
ret = MACH_SEND_INVALID_DATA;
goto out1;
}
#ifdef KTRACE
/* Dump the Mach message */
if (KTRPOINT(p, KTR_MMSG))
ktrmmsg(l, (char *)sm, send_size);
#endif
/*
* Handle rights in the message
*/
ln = sm->msgh_local_port;
rn = sm->msgh_remote_port;
lr = mach_right_check(ln, l, MACH_PORT_TYPE_ALL_RIGHTS);
rr = mach_right_check(rn, l, MACH_PORT_TYPE_ALL_RIGHTS);
if ((rr == NULL) || (rr->mr_port == NULL)) {
#ifdef DEBUG_MACH
printf("msg id %d: invalid dest\n", sm->msgh_id);
#endif
ret = MACH_SEND_INVALID_DEST;
goto out1;
}
/*
* Check that the process has a send right on
* the remote port.
*/
rights = (MACH_PORT_TYPE_SEND | MACH_PORT_TYPE_SEND_ONCE);
if (mach_right_check(rn, l, rights) == NULL) {
ret = MACH_SEND_INVALID_RIGHT;
goto out1;
}
/*
* If the remote port is a special port (host, kernel,
* clock, or io_master), the message will be handled
* by the kernel.
*/
med = (struct mach_emuldata *)p->p_emuldata;
mp = rr->mr_port;
if (mp->mp_flags & MACH_MP_INKERNEL) {
struct mach_trap_args args;
mach_msg_header_t *rm;
size_t min_reqlen, max_replen;
/*
* Look for the function that will handle it,
* using the message id.
*/
for (srv = mach_services_table; srv->srv_id; srv++)
if (srv->srv_id == sm->msgh_id)
break;
/*
* If no match, give up, and display a warning.
*/
if (srv->srv_handler == NULL) {
uprintf("No mach server for id = %d\n",
sm->msgh_id);
ret = MACH_SEND_INVALID_DEST;
goto out1;
}
min_reqlen = srv->srv_reqlen;
max_replen = srv->srv_replen;
/*
* Special case when the kernel behaves as
* the client: replies to exceptions and
* notifications. There will be no reply,
* as we already receive a reply.
* - request and reply are swapped
* - there will be no reply, so set lr to NULL.
* - skip the lr == NULL tests
* XXX This is inelegant.
*/
if ((sm->msgh_id >= 2501) && (sm->msgh_id <= 2503)) {
min_reqlen = srv->srv_replen;
max_replen = srv->srv_reqlen;
lr = NULL;
goto skip_null_lr;
}
/*
* Check that the local port is valid, else
* we will not be able to send the reply
*/
if ((lr == NULL) ||
(lr->mr_port == NULL) ||
(lr->mr_port->mp_recv == NULL)) {
#ifdef DEBUG_MACH
printf("msg id %d: invalid src\n", sm->msgh_id);
#endif
ret = MACH_SEND_INVALID_REPLY;
goto out1;
}
skip_null_lr:
/*
* Sanity check message length. We do not want the
* server to:
* 1) use kernel memory located after
* the end of the request message.
*/
if (send_size < min_reqlen) {
#ifdef DEBUG_MACH
printf("mach server %s: smsg overflow: "
"send = %d, min = %d\n",
srv->srv_name, send_size, min_reqlen);
#endif
ret = MACH_SEND_MSG_TOO_SMALL;
goto out1;
}
/*
* 2) Overwrite kernel memory after the end of the
* reply message buffer. This check is the
* responsibility of the server.
*/
/*
* Invoke the server. We give it the opportunity
* to shorten recv_size if there is less data in
* the reply than what the sender expected.
* If lr is NULL, this is a no reply operation.
*/
reply_size = max_replen;
if (lr != NULL)
rm = malloc(reply_size, M_EMULDATA, M_WAITOK | M_ZERO);
else
rm = NULL;
args.l = l;
args.tl = mach_get_target_task(l, mp);
args.smsg = sm;
args.rmsg = rm;
args.rsize = &reply_size;
args.ssize = send_size;
if ((ret = (*srv->srv_handler)(&args)) != 0)
goto out1;
/*
* No-reply opration: everything is done.
* Change option so that we skip the
* receive stage.
*/
if (lr == NULL) {
*option &= ~MACH_RCV_MSG;
return MACH_MSG_SUCCESS;
}
#ifdef DIAGNOSTIC
/*
* Catch potential bug in the server (sanity
* check #2): did it output a larger message
* then the one that was allocated?
*/
if ((*option & MACH_RCV_MSG) && (reply_size > max_replen)) {
uprintf("mach_msg: reply too big in %s\n",
srv->srv_name);
}
#endif
/*
* Queue the reply.
*/
mp = lr->mr_port;
(void)mach_message_get(rm, reply_size, mp, NULL);
#ifdef DEBUG_MACH_MSG
printf("pid %d: message queued on port %p (%d) [%p]\n",
p->p_pid, mp, rm->msgh_id,
mp->mp_recv->mr_sethead);
if (sm->msgh_id == 404)
printf("*** msg to bootstrap. port = %p, "
"recv = %p [%p]\n", mach_bootstrap_port,
mach_bootstrap_port->mp_recv,
mach_bootstrap_port->mp_recv->mr_sethead);
#endif
wakeup(mp->mp_recv->mr_sethead);
ret = MACH_MSG_SUCCESS;
out1:
free(sm, M_EMULDATA);
return ret;
}
/*
* The message is not to be handled by the kernel.
* Check that there is a valid receiver, and
* queue the message in the remote port.
*/
mp = rr->mr_port; /* (mp != NULL) already checked */
if (mp->mp_recv == NULL) {
#ifdef DEBUG_MACH
printf("msg id %d: invalid dst\n", sm->msgh_id);
#endif
free(sm, M_EMULDATA);
return MACH_SEND_INVALID_DEST;
}
(void)mach_message_get(sm, send_size, mp, l);
#ifdef DEBUG_MACH_MSG
printf("pid %d: message queued on port %p (%d) [%p]\n",
p->p_pid, mp, sm->msgh_id,
mp->mp_recv->mr_sethead);
#endif
/*
* Drop any right carried by the message.
*/
if (lr != NULL) {
bits = MACH_MSGH_LOCAL_BITS(sm->msgh_bits);
mach_drop_rights(lr, bits);
}
if (rr != NULL) {
bits = MACH_MSGH_REMOTE_BITS(sm->msgh_bits);
mach_drop_rights(rr, bits);
}
/*
* Wakeup any process awaiting for this message.
*/
wakeup(mp->mp_recv->mr_sethead);
return MACH_MSG_SUCCESS;
}
/*
* Receive a Mach message. This returns a Mach message error code.
*/
static inline int
mach_msg_recv(l, urm, option, recv_size, timeout, mn)
struct lwp *l;
mach_msg_header_t *urm;
int option;
size_t recv_size;
unsigned int timeout;
mach_port_t mn;
{
struct mach_port *mp;
struct proc *p = l->l_proc;
struct mach_message *mm;
mach_port_t tmp;
struct mach_right *cmr;
struct mach_right *mr;
int bits;
int ret;
int error = 0;
if (option & MACH_RCV_TIMEOUT)
timeout = timeout * hz / 1000;
else
timeout = 0;
/*
* Check for receive right on the port.
*/
mr = mach_right_check(mn, l, MACH_PORT_TYPE_RECEIVE);
if (mr == NULL) {
/*
* Is it a port set?
*/
mr = mach_right_check(mn, l, MACH_PORT_TYPE_PORT_SET);
if (mr == NULL)
return MACH_RCV_INVALID_NAME;
/*
* This is a port set. For each port in the
* port set, check we have receive right, and
* and check if we have some message.
*/
LIST_FOREACH(cmr, &mr->mr_set, mr_setlist) {
if ((mach_right_check(cmr->mr_name, l,
MACH_PORT_TYPE_RECEIVE)) == NULL)
return MACH_RCV_INVALID_NAME;
mp = cmr->mr_port;
#ifdef DEBUG_MACH
if (mp->mp_recv != cmr)
uprintf("mach_msg_trap: bad receive "
"port/right\n");
#endif
if (mp->mp_count != 0)
break;
}
/*
* If cmr is NULL then we found no message on
* any port. Sleep on the port set until we get
* some or until we get a timeout.
*/
if (cmr == NULL) {
#ifdef DEBUG_MACH_MSG
printf("pid %d: wait on port %p [%p]\n",
p->p_pid, mp, mr->mr_sethead);
#endif
error = tsleep(mr->mr_sethead, PZERO|PCATCH,
"mach_msg", timeout);
if ((error == ERESTART) || (error == EINTR))
return MACH_RCV_INTERRUPTED;
/*
* Check we did not loose the receive right
* while we were sleeping.
*/
if ((mach_right_check(mn, l,
MACH_PORT_TYPE_PORT_SET)) == NULL)
return MACH_RCV_PORT_DIED;
/*
* Is there any pending message for
* a port in the port set?
*/
LIST_FOREACH(cmr, &mr->mr_set, mr_setlist) {
mp = cmr->mr_port;
if (mp->mp_count != 0)
break;
}
if (cmr == NULL)
return MACH_RCV_TIMED_OUT;
}
/*
* We found a port with a pending message.
*/
mp = cmr->mr_port;
} else {
/*
* This is a receive on a simple port (no port set).
* If there is no message queued on the port,
* block until we get some.
*/
mp = mr->mr_port;
#ifdef DEBUG_MACH
if (mp->mp_recv != mr)
uprintf("mach_msg_trap: bad receive "
"port/right\n");
#endif
#ifdef DEBUG_MACH_MSG
printf("pid %d: wait on port %p [%p]\n",
p->p_pid, mp, mr->mr_sethead);
#endif
if (mp->mp_count == 0) {
error = tsleep(mr->mr_sethead, PZERO|PCATCH,
"mach_msg", timeout);
if ((error == ERESTART) || (error == EINTR))
return MACH_RCV_INTERRUPTED;
/*
* Check we did not lose the receive right
* while we were sleeping.
*/
if ((mach_right_check(mn, l,
MACH_PORT_TYPE_RECEIVE)) == NULL)
return MACH_RCV_PORT_DIED;
if (mp->mp_count == 0)
return MACH_RCV_TIMED_OUT;
}
}
/*
* Dequeue the message.
* XXX Do we really need to lock here? There could be
* only one reader process, so mm will not disapear
* except if there is a port refcount error in our code.
*/
lockmgr(&mp->mp_msglock, LK_SHARED, NULL);
mm = TAILQ_FIRST(&mp->mp_msglist);
#ifdef DEBUG_MACH_MSG
printf("pid %d: dequeue message on port %p (id %d)\n",
p->p_pid, mp, mm->mm_msg->msgh_id);
#endif
ret = MACH_MSG_SUCCESS;
if (mm->mm_size > recv_size) {
struct mach_short_reply sr;
ret = MACH_RCV_TOO_LARGE;
/*
* If MACH_RCV_LARGE was not set, destroy the message.
*/
if ((option & MACH_RCV_LARGE) == 0) {
free(mm->mm_msg, M_EMULDATA);
mach_message_put_shlocked(mm);
goto unlock;
}
/*
* If MACH_RCV_TOO_LARGE is set, then return
* a message with just header and trailer. The
* size in the header should correspond to the
* whole message, so just copy the whole header.
*/
memcpy(&sr, mm->mm_msg, sizeof(mach_msg_header_t));
mach_set_trailer(&sr, sizeof(sr));
if ((error = copyout(&sr, urm, sizeof(sr))) != 0) {
ret = MACH_RCV_INVALID_DATA;
goto unlock;
}
#ifdef KTRACE
/* Dump the Mach message */
if (KTRPOINT(p, KTR_MMSG))
ktrmmsg(l, (char *)&sr, sizeof(sr));
#endif
goto unlock;
}
/*
* Get rights carried by the message if it is not a
* reply from the kernel.
* XXX mm->mm_l could contain stall data. Reference
* the thread's kernel port instead?
*/
if (mm->mm_l != NULL) {
mach_port_t *mnp;
#ifdef DEBUG_MACH
printf("mach_msg: non kernel-reply message\n");
#endif
/*
* Turn local and remote port names into
* names in the local process namespace.
*/
bits = MACH_MSGH_LOCAL_BITS(mm->mm_msg->msgh_bits);
mnp = &mm->mm_msg->msgh_local_port;
mach_trade_rights(l, mm->mm_l, mnp, bits);
bits = MACH_MSGH_REMOTE_BITS(mm->mm_msg->msgh_bits);
mnp = &mm->mm_msg->msgh_remote_port;
mach_trade_rights(l, mm->mm_l, mnp, bits);
/*
* The same operation must be done to all
* port descriptors carried with the message.
*/
if ((mm->mm_msg->msgh_bits & MACH_MSGH_BITS_COMPLEX) &&
((ret = mach_trade_rights_complex(l, mm)) != 0))
goto unlock;
/*
* swap local and remote ports, and
* corresponding bits as well.
*/
bits = (bits & 0xffff0000) |
((bits & 0xff00) >> 8) |
((bits & 0x00ff) << 8);
tmp = mm->mm_msg->msgh_remote_port;
mm->mm_msg->msgh_remote_port =
mm->mm_msg->msgh_local_port;
mm->mm_msg->msgh_local_port = tmp;
}
/*
* Copy the message to userland.
*/
if ((error = copyout(mm->mm_msg, urm, mm->mm_size)) != 0) {
ret = MACH_RCV_INVALID_DATA;
goto unlock;
}
#ifdef KTRACE
/* Dump the Mach message */
if (KTRPOINT(p, KTR_MMSG))
ktrmmsg(l, (char *)mm->mm_msg, mm->mm_size);
#endif
free(mm->mm_msg, M_EMULDATA);
mach_message_put_shlocked(mm); /* decrease mp_count */
unlock:
lockmgr(&mp->mp_msglock, LK_RELEASE, NULL);
return ret;
}
int
mach_sys_msg_trap(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct mach_sys_msg_trap_args /* {
syscallarg(mach_msg_header_t *) msg;
syscallarg(mach_msg_option_t) option;
syscallarg(mach_msg_size_t) send_size;
syscallarg(mach_msg_size_t) rcv_size;
syscallarg(mach_port_name_t) rcv_name;
syscallarg(mach_msg_timeout_t) timeout;
syscallarg(mach_port_name_t) notify;
} */ *uap = v;
struct mach_sys_msg_overwrite_trap_args cup;
SCARG(&cup, msg) = SCARG(uap, msg);
SCARG(&cup, option) = SCARG(uap, option);
SCARG(&cup, send_size) = SCARG(uap, send_size);
SCARG(&cup, rcv_size) = SCARG(uap, rcv_size);
SCARG(&cup, rcv_name) = SCARG(uap, rcv_name);
SCARG(&cup, timeout) = SCARG(uap, timeout);
SCARG(&cup, notify) = SCARG(uap, notify);
SCARG(&cup, rcv_msg) = NULL;
SCARG(&cup, scatter_list_size) = 0;
return mach_sys_msg_overwrite_trap(l, &cup, retval);
}
static inline struct lwp *
mach_get_target_task(l, mp)
struct lwp *l;
struct mach_port *mp;
{
struct proc *tp;
struct lwp *tl;
switch (mp->mp_datatype) {
case MACH_MP_PROC:
tp = (struct proc *)mp->mp_data;
tl = proc_representative_lwp(tp);
break;
case MACH_MP_LWP:
tl = (struct lwp *)mp->mp_data;
break;
default:
tl = l;
break;
}
return tl;
}
static inline void
mach_drop_rights(mr, bits)
struct mach_right *mr;
int bits;
{
int rights;
switch (bits) {
case MACH_MSG_TYPE_MOVE_SEND:
rights = MACH_PORT_TYPE_SEND;
break;
case MACH_MSG_TYPE_MOVE_SEND_ONCE:
rights = MACH_PORT_TYPE_SEND_ONCE;
break;
case MACH_MSG_TYPE_MOVE_RECEIVE:
/* Recv. right is lost when msg is received */
case MACH_MSG_TYPE_MAKE_SEND:
case MACH_MSG_TYPE_COPY_SEND:
case MACH_MSG_TYPE_MAKE_SEND_ONCE:
default:
rights = 0;
break;
}
if (rights != 0)
mach_right_put(mr, rights);
return;
}
/*
* When a messages is transmitted from one process to another,
* we need to make sure the port names are in the receiver process
* namespace.
*/
static inline void
mach_trade_rights(ll, rl, mnp, bits)
struct lwp *ll; /* local lwp (receiver, current lwp) */
struct lwp *rl; /* remote lwp (sender) */
mach_port_t *mnp; /* pointer to the port name */
int bits; /* right bits */
{
int lr; /* local right type (to be added) */
int rr; /* remote right type */
struct mach_right *lmr; /* right in the local process */
struct mach_right *rmr; /* right in the remote process */
switch (bits) {
case MACH_MSG_TYPE_MAKE_SEND:
rr = MACH_PORT_TYPE_RECEIVE;
lr = MACH_PORT_TYPE_SEND;
break;
case MACH_MSG_TYPE_COPY_SEND:
case MACH_MSG_TYPE_MOVE_SEND:
rr = MACH_PORT_TYPE_SEND;
lr = MACH_PORT_TYPE_SEND;
break;
case MACH_MSG_TYPE_MAKE_SEND_ONCE:
rr = MACH_PORT_TYPE_RECEIVE;
lr = MACH_PORT_TYPE_SEND_ONCE;
break;
case MACH_MSG_TYPE_MOVE_SEND_ONCE:
rr = MACH_PORT_TYPE_SEND_ONCE;
lr = MACH_PORT_TYPE_SEND_ONCE;
break;
case MACH_MSG_TYPE_MOVE_RECEIVE:
rr = MACH_PORT_TYPE_RECEIVE;
lr = MACH_PORT_TYPE_RECEIVE;
break;
default:
rr = 0;
lr = 0;
break;
}
/* Get the right in the remote process (sender) */
rmr = NULL;
if (lr != 0)
rmr = mach_right_check(*mnp, rl, rr);
/* Translate it into a right in the local process (receiver) */
if (rmr != NULL) {
lmr = mach_right_get(rmr->mr_port, ll, lr, 0);
*mnp = lmr->mr_name;
} else {
*mnp = 0;
}
return;
}
/*
* Turn rights carried by complex messages into rights in
* the local namespace. Returns a Mach messsage error
* XXX Nothing is there yet to remove the rights from the
* sender namespace, it should be done at send time and it
* is not done yet.
*/
static inline int
mach_trade_rights_complex(l, mm)
struct lwp *l;
struct mach_message *mm;
{
struct mach_complex_msg *mcm;
unsigned int i, count;
unsigned long begin, end;
/*
* Sanity check the descriptor count.
* Note that all descriptor types
* have the same size, hence it is
* safe to not take the descriptor
* type into account here.
*/
mcm = (struct mach_complex_msg *)mm->mm_msg;
count = mcm->mcm_body.msgh_descriptor_count;
begin = (u_long)mcm;
end = (u_long)&mcm->mcm_desc.gen[count];
if ((end - begin) > mm->mm_size) {
#ifdef DEBUG_MACH
printf("msg id %d: invalid count\n", mm->mm_msg->msgh_id);
#endif
return MACH_SEND_INVALID_DATA;
}
for (i = 0; i < count; i++) {
switch (mcm->mcm_desc.gen[i].type) {
case MACH_MSG_PORT_DESCRIPTOR:
mach_trade_rights(l, mm->mm_l,
&mcm->mcm_desc.port[i].name,
mcm->mcm_desc.port[i].disposition);
break;
case MACH_MSG_OOL_PORTS_DESCRIPTOR: { /* XXX untested */
struct lwp *rl; /* remote LWP */
void *lumnp; /* local user address */
void *rumnp; /* remote user address */
int disp; /* disposition*/
size_t size; /* data size */
int mcount; /* descriptor count */
mach_port_t *kmnp;
void *kaddr;
int error;
int j;
rl = mm->mm_l;
disp = mcm->mcm_desc.ool_ports[i].disposition;
rumnp = mcm->mcm_desc.ool_ports[i].address;
mcount = mcm->mcm_desc.ool_ports[i].count;
size = mcount * sizeof(*kmnp);
kaddr = NULL;
lumnp = NULL;
/* This allocates kmnp */
error = mach_ool_copyin(rl, rumnp, &kaddr, size, 0);
if (error != 0)
return MACH_SEND_INVALID_DATA;
kmnp = (mach_port_t *)kaddr;
for (j = 0; j < mcount; j++)
mach_trade_rights(l, mm->mm_l, &kmnp[j], disp);
/* This frees kmnp */
if ((error = mach_ool_copyout(l, kmnp, &lumnp,
size, MACH_OOL_FREE|MACH_OOL_TRACE)) != 0)
return MACH_SEND_INVALID_DATA;
mcm->mcm_desc.ool_ports[i].address = lumnp;
break;
}
case MACH_MSG_OOL_VOLATILE_DESCRIPTOR:
#ifdef DEBUG_MACH
printf("MACH_MSG_OOL_VOLATILE_DESCRIPTOR\n");
#endif
/* FALLTHROUGH */
case MACH_MSG_OOL_DESCRIPTOR: { /* XXX untested */
struct lwp *rl; /* remote LWP */
void *ludata; /* local user address */
void *rudata; /* remote user address */
size_t size; /* data size */
void *kdata;
int error;
rl = mm->mm_l;
rudata = mcm->mcm_desc.ool[i].address;
size = mcm->mcm_desc.ool[i].size;
kdata = NULL;
ludata = NULL;
/*
* XXX This is inefficient for large chunk of OOL
* memory. Think about remapping COW when possible.
*/
/* This allocates kdata */
error = mach_ool_copyin(rl, rudata, &kdata, size, 0);
if (error != 0)
return MACH_SEND_INVALID_DATA;
/* This frees kdata */
if ((error = mach_ool_copyout(l, kdata, &ludata,
size, MACH_OOL_FREE|MACH_OOL_TRACE)) != 0)
return MACH_SEND_INVALID_DATA;
mcm->mcm_desc.ool_ports[i].address = ludata;
break;
}
default:
#ifdef DEBUG_MACH
printf("unknown descriptor type %d\n",
mcm->mcm_desc.gen[i].type);
#endif
break;
}
}
return MACH_MSG_SUCCESS;
}
inline int
mach_ool_copyin(l, uaddr, kaddr, size, flags)
struct lwp *l;
const void *uaddr;
void **kaddr;
size_t size;
int flags;
{
int error;
void *kbuf;
struct proc *p = l->l_proc;
/*
* Sanity check OOL size to avoid DoS on malloc: useless once
* we remap data instead of copying it. In the meantime,
* disabled since it makes some OOL transfer fail.
*/
#if 0
if (size > MACH_MAX_OOL_LEN)
return ENOMEM;
#endif
if (*kaddr == NULL)
kbuf = malloc(size, M_EMULDATA, M_WAITOK);
else
kbuf = *kaddr;
if ((error = copyin_proc(p, uaddr, kbuf, size)) != 0) {
if (*kaddr == NULL)
free(kbuf, M_EMULDATA);
return error;
}
#ifdef KTRACE
if (size > PAGE_SIZE)
size = PAGE_SIZE;
if ((flags & MACH_OOL_TRACE) && KTRPOINT(p, KTR_MOOL))
ktrmool(l, kaddr, size, uaddr);
#endif
*kaddr = kbuf;
return 0;
}
inline int
mach_ool_copyout(l, kaddr, uaddr, size, flags)
struct lwp *l;
const void *kaddr;
void **uaddr;
size_t size;
int flags;
{
vaddr_t ubuf;
int error = 0;
struct proc *p = l->l_proc;
/*
* Sanity check OOL size to avoid DoS on malloc: useless once
* we remap data instead of copying it. In the meantime,
* disabled since it makes some OOL transfer fail.
*/
#if 0
if (size > MACH_MAX_OOL_LEN) {
error = ENOMEM;
goto out;
}
#endif
if (*uaddr == NULL)
ubuf = (vaddr_t)vm_map_min(&p->p_vmspace->vm_map);
else
ubuf = (vaddr_t)*uaddr;
/* Never map anything at address zero: this is a red zone */
if (ubuf == (vaddr_t)NULL)
ubuf += PAGE_SIZE;
if ((error = uvm_map(&p->p_vmspace->vm_map, &ubuf,
round_page(size), NULL, UVM_UNKNOWN_OFFSET, 0,
UVM_MAPFLAG(UVM_PROT_RW, UVM_PROT_ALL,
UVM_INH_COPY, UVM_ADV_NORMAL, UVM_FLAG_COPYONW))) != 0)
goto out;
if ((error = copyout_proc(p, kaddr, (void *)ubuf, size)) != 0)
goto out;
#ifdef KTRACE
if (size > PAGE_SIZE)
size = PAGE_SIZE;
if ((flags & MACH_OOL_TRACE) && KTRPOINT(p, KTR_MOOL))
ktrmool(l, kaddr, size, (void *)ubuf);
#endif
out:
if (flags & MACH_OOL_FREE)
free(__UNCONST(kaddr), M_EMULDATA); /*XXXUNCONST*/
if (error == 0)
*uaddr = (void *)ubuf;
return error;
}
inline void
mach_set_trailer(msgh, size)
void *msgh;
size_t size;
{
mach_msg_trailer_t *trailer;
char *msg = (char *)msgh;
trailer = (mach_msg_trailer_t *)&msg[size - sizeof(*trailer)];
trailer->msgh_trailer_type = MACH_MSG_TRAILER_FORMAT_0;
trailer->msgh_trailer_size = sizeof(*trailer);
return;
}
inline void
mach_set_header(rep, req, size)
void *rep;
void *req;
size_t size;
{
mach_msg_header_t *rephdr = rep;
mach_msg_header_t *reqhdr = req;
rephdr->msgh_bits =
MACH_MSGH_REPLY_LOCAL_BITS(MACH_MSG_TYPE_MOVE_SEND_ONCE);
rephdr->msgh_size = size - sizeof(mach_msg_trailer_t);
rephdr->msgh_local_port = reqhdr->msgh_local_port;
rephdr->msgh_remote_port = 0;
rephdr->msgh_id = reqhdr->msgh_id + 100;
return;
}
inline void
mach_add_port_desc(msg, name)
void *msg;
mach_port_name_t name;
{
struct mach_complex_msg *mcm = msg;
int i;
if ((mcm->mcm_header.msgh_bits & MACH_MSGH_BITS_COMPLEX) == 0) {
mcm->mcm_header.msgh_bits |= MACH_MSGH_BITS_COMPLEX;
mcm->mcm_body.msgh_descriptor_count = 0;
}
i = mcm->mcm_body.msgh_descriptor_count;
mcm->mcm_desc.port[i].name = name;
mcm->mcm_desc.port[i].disposition = MACH_MSG_TYPE_MOVE_SEND;
mcm->mcm_desc.port[i].type = MACH_MSG_PORT_DESCRIPTOR;
mcm->mcm_body.msgh_descriptor_count++;
return;
}
inline void
mach_add_ool_ports_desc(msg, addr, count)
void *msg;
void *addr;
int count;
{
struct mach_complex_msg *mcm = msg;
int i;
if ((mcm->mcm_header.msgh_bits & MACH_MSGH_BITS_COMPLEX) == 0) {
mcm->mcm_header.msgh_bits |= MACH_MSGH_BITS_COMPLEX;
mcm->mcm_body.msgh_descriptor_count = 0;
}
i = mcm->mcm_body.msgh_descriptor_count;
mcm->mcm_desc.ool_ports[i].address = addr;
mcm->mcm_desc.ool_ports[i].count = count;
mcm->mcm_desc.ool_ports[i].copy = MACH_MSG_ALLOCATE;
mcm->mcm_desc.ool_ports[i].disposition = MACH_MSG_TYPE_MOVE_SEND;
mcm->mcm_desc.ool_ports[i].type = MACH_MSG_OOL_PORTS_DESCRIPTOR;
mcm->mcm_body.msgh_descriptor_count++;
return;
}
inline void mach_add_ool_desc(msg, addr, size)
void *msg;
void *addr;
size_t size;
{
struct mach_complex_msg *mcm = msg;
int i;
if ((mcm->mcm_header.msgh_bits & MACH_MSGH_BITS_COMPLEX) == 0) {
mcm->mcm_header.msgh_bits |= MACH_MSGH_BITS_COMPLEX;
mcm->mcm_body.msgh_descriptor_count = 0;
}
i = mcm->mcm_body.msgh_descriptor_count;
mcm->mcm_desc.ool[i].address = addr;
mcm->mcm_desc.ool[i].size = size;
mcm->mcm_desc.ool[i].deallocate = 0;
mcm->mcm_desc.ool[i].copy = MACH_MSG_ALLOCATE;
mcm->mcm_desc.ool[i].type = MACH_MSG_OOL_DESCRIPTOR;
mcm->mcm_body.msgh_descriptor_count++;
return;
}
void
mach_message_init(void)
{
pool_init(&mach_message_pool, sizeof (struct mach_message),
0, 0, 0, "mach_message_pool", NULL);
return;
}
struct mach_message *
mach_message_get(msgh, size, mp, l)
mach_msg_header_t *msgh;
size_t size;
struct mach_port *mp;
struct lwp *l;
{
struct mach_message *mm;
mm = (struct mach_message *)pool_get(&mach_message_pool, PR_WAITOK);
bzero(mm, sizeof(*mm));
mm->mm_msg = msgh;
mm->mm_size = size;
mm->mm_port = mp;
mm->mm_l = l;
lockmgr(&mp->mp_msglock, LK_EXCLUSIVE, NULL);
TAILQ_INSERT_TAIL(&mp->mp_msglist, mm, mm_list);
mp->mp_count++;
lockmgr(&mp->mp_msglock, LK_RELEASE, NULL);
return mm;
}
void
mach_message_put(mm)
struct mach_message *mm;
{
struct mach_port *mp;
mp = mm->mm_port;
lockmgr(&mp->mp_msglock, LK_EXCLUSIVE, NULL);
mach_message_put_exclocked(mm);
lockmgr(&mp->mp_msglock, LK_RELEASE, NULL);
return;
}
void
mach_message_put_shlocked(mm)
struct mach_message *mm;
{
struct mach_port *mp;
mp = mm->mm_port;
lockmgr(&mp->mp_msglock, LK_UPGRADE, NULL);
mach_message_put_exclocked(mm);
lockmgr(&mp->mp_msglock, LK_DOWNGRADE, NULL);
return;
}
void
mach_message_put_exclocked(mm)
struct mach_message *mm;
{
struct mach_port *mp;
mp = mm->mm_port;
TAILQ_REMOVE(&mp->mp_msglist, mm, mm_list);
mp->mp_count--;
pool_put(&mach_message_pool, mm);
return;
}
#ifdef DEBUG_MACH
void
mach_debug_message(void)
{
struct lwp *l;
struct mach_emuldata *med;
struct mach_right *mr;
struct mach_right *mrs;
struct mach_port *mp;
struct mach_message *mm;
LIST_FOREACH(l, &alllwp, l_list) {
if ((l->l_proc->p_emul != &emul_mach) &&
#ifdef COMPAT_DARWIN
(l->l_proc->p_emul != &emul_darwin) &&
#endif
1)
continue;
med = l->l_proc->p_emuldata;
LIST_FOREACH(mr, &med->med_right, mr_list)
if ((mr->mr_type & MACH_PORT_TYPE_PORT_SET) == 0) {
mp = mr->mr_port;
if (mp == NULL)
continue;
printf("port %p(%d) ", mp, mp->mp_count);
TAILQ_FOREACH(mm, &mp->mp_msglist, mm_list)
printf("%d ", mm->mm_msg->msgh_id);
printf("\n");
continue;
}
/* Port set... */
LIST_FOREACH(mrs, &mr->mr_set, mr_setlist) {
mp = mrs->mr_port;
if (mp == NULL)
continue;
printf("port %p(%d) ", mp, mp->mp_count);
TAILQ_FOREACH(mm, &mp->mp_msglist, mm_list)
printf("%d ", mm->mm_msg->msgh_id);
printf("\n");
}
}
return;
}
#endif /* DEBUG_MACH */
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