freebsd-skq/sys/i386/ibcs2/ibcs2_msg.c
sam 821f72c0a4 correct bounds check of fd parameter
Noticed by:	Coverity Prevent analysis tool
2005-02-25 20:15:11 +00:00

136 lines
3.7 KiB
C

/*-
* Copyright (c) 1995 Steven Wallace
* All rights reserved.
*
* 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. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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>
__FBSDID("$FreeBSD$");
/*
* IBCS2 message compatibility module.
*
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/syscallsubr.h>
#include <sys/sysproto.h>
#include <i386/ibcs2/ibcs2_types.h>
#include <i386/ibcs2/ibcs2_signal.h>
#include <i386/ibcs2/ibcs2_util.h>
#include <i386/ibcs2/ibcs2_poll.h>
#include <i386/ibcs2/ibcs2_proto.h>
int
ibcs2_getmsg(td, uap)
struct thread *td;
struct ibcs2_getmsg_args *uap;
{
return 0; /* fake */
}
int
ibcs2_putmsg(td, uap)
struct thread *td;
struct ibcs2_putmsg_args *uap;
{
return 0; /* fake */
}
int
ibcs2_poll(td, uap)
struct thread *td;
struct ibcs2_poll_args *uap;
{
int error, i, nfds;
fd_set *readfds, *writefds, *exceptfds;
struct timeval timeout, *tp;
struct ibcs2_poll conv;
caddr_t sg = stackgap_init();
if (uap->nfds > FD_SETSIZE)
return EINVAL;
readfds = stackgap_alloc(&sg, sizeof(fd_set *));
writefds = stackgap_alloc(&sg, sizeof(fd_set *));
exceptfds = stackgap_alloc(&sg, sizeof(fd_set *));
FD_ZERO(readfds);
FD_ZERO(writefds);
FD_ZERO(exceptfds);
if (uap->timeout == -1)
tp = NULL;
else {
timeout.tv_usec = (uap->timeout % 1000)*1000;
timeout.tv_sec = uap->timeout / 1000;
tp = &timeout;
}
nfds = 0;
for (i = 0; i < uap->nfds; i++) {
if ((error = copyin(uap->fds + i*sizeof(struct ibcs2_poll),
&conv, sizeof(conv))) != 0)
return error;
conv.revents = 0;
if (conv.fd < 0 || conv.fd >= FD_SETSIZE)
continue;
if (conv.fd >= nfds)
nfds = conv.fd + 1;
if (conv.events & IBCS2_READPOLL)
FD_SET(conv.fd, readfds);
if (conv.events & IBCS2_WRITEPOLL)
FD_SET(conv.fd, writefds);
FD_SET(conv.fd, exceptfds);
}
error = kern_select(td, nfds, readfds, writefds, exceptfds, tp);
if (error != 0)
return error;
if (td->td_retval[0] == 0)
return 0;
td->td_retval[0] = 0;
for (td->td_retval[0] = 0, i = 0; i < uap->nfds; i++) {
copyin(uap->fds + i*sizeof(struct ibcs2_poll),
&conv, sizeof(conv));
conv.revents = 0;
if (conv.fd < 0 || conv.fd > FD_SETSIZE)
/* should check for open as well */
conv.revents |= IBCS2_POLLNVAL;
else {
if (FD_ISSET(conv.fd, readfds))
conv.revents |= IBCS2_POLLIN;
if (FD_ISSET(conv.fd, writefds))
conv.revents |= IBCS2_POLLOUT;
if (FD_ISSET(conv.fd, exceptfds))
conv.revents |= IBCS2_POLLERR;
if (conv.revents)
++td->td_retval[0];
}
if ((error = copyout(&conv,
uap->fds + i*sizeof(struct ibcs2_poll),
sizeof(conv))) != 0)
return error;
}
return 0;
}