freebsd-dev/sys/i386/isa/spigot.c
Jacques Vidrine 007e25d95a Add or correct range checking of signal numbers in system calls and
ioctls.

In the particular case of ptrace(), this commit more-or-less reverts
revision 1.53 of sys_process.c, which appears to have been erroneous.

Reviewed by:	iedowse, jhb
2003-08-10 23:04:55 +00:00

288 lines
6.8 KiB
C

/*
* Video spigot capture driver.
*
* Copyright (c) 1995, Jim Lowe. 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.
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*
* This is the minimum driver code required to make a spigot work.
* Unfortunatly, I can't include a real driver since the information
* on the spigot is under non-disclosure. You can pick up a library
* that will work with this driver from
* ftp://ftp.cs.uwm.edu/pub/FreeBSD-UWM. The library contains the
* source that I can release as well as several object modules and
* functions that allows one to read spigot data. See the code for
* spigot_grab.c that is included with the library data.
*
* The vendor will not allow me to release the spigot library code.
* Please don't ask me for it.
*
* To use this driver you will need the spigot library. The library is
* available from:
*
* ftp.cs.uwm.edu://pub/FreeBSD-UWM/spigot/spigot.tar.gz
*
* Version 1.7, December 1995.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "spigot.h"
#if NSPIGOT > 1
error "Can only have 1 spigot configured."
#endif
#include "opt_spigot.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/mman.h>
#include <sys/mutex.h>
#include <sys/proc.h>
#include <sys/signalvar.h>
#include <machine/frame.h>
#include <machine/md_var.h>
#include <machine/spigot.h>
#include <machine/psl.h>
#include <i386/isa/isa_device.h>
static struct spigot_softc {
u_long flags;
u_long maddr;
struct proc *p;
u_long signal_num;
u_short irq;
} spigot_softc[NSPIGOT];
/* flags in softc */
#define OPEN 0x01
#define ALIVE 0x02
#define UNIT(dev) minor(dev)
static int spigot_probe(struct isa_device *id);
static int spigot_attach(struct isa_device *id);
struct isa_driver spigotdriver = {
INTR_TYPE_MISC,
spigot_probe,
spigot_attach,
"spigot"
};
COMPAT_ISA_DRIVER(spigot, spigotdriver);
static d_open_t spigot_open;
static d_close_t spigot_close;
static d_read_t spigot_read;
static d_write_t spigot_write;
static d_ioctl_t spigot_ioctl;
static d_mmap_t spigot_mmap;
#define CDEV_MAJOR 11
static struct cdevsw spigot_cdevsw = {
.d_open = spigot_open,
.d_close = spigot_close,
.d_read = spigot_read,
.d_write = spigot_write,
.d_ioctl = spigot_ioctl,
.d_mmap = spigot_mmap,
.d_name = "spigot",
.d_maj = CDEV_MAJOR,
};
static ointhand2_t spigintr;
static int
spigot_probe(struct isa_device *devp)
{
int status;
struct spigot_softc *ss=(struct spigot_softc *)&spigot_softc[devp->id_unit];
ss->flags = 0;
ss->maddr = 0;
ss->irq = 0;
if(devp->id_iobase != 0xad6 || inb(0xad9) == 0xff)
status = 0; /* not found */
else {
status = 1; /* found */
ss->flags |= ALIVE;
}
return(status);
}
static int
spigot_attach(struct isa_device *devp)
{
int unit;
struct spigot_softc *ss= &spigot_softc[unit = devp->id_unit];
devp->id_ointr = spigintr;
ss->maddr = kvtop(devp->id_maddr);
ss->irq = devp->id_irq;
make_dev(&spigot_cdevsw, unit, 0, 0, 0644, "spigot%d", unit);
return 1;
}
static int
spigot_open(dev_t dev, int flags, int fmt, struct thread *td)
{
int error;
struct spigot_softc *ss = (struct spigot_softc *)&spigot_softc[UNIT(dev)];
if((ss->flags & ALIVE) == 0)
return ENXIO;
if(ss->flags & OPEN)
return EBUSY;
#if !defined(SPIGOT_UNSECURE)
/*
* Don't allow open() unless the process has sufficient privileges,
* since mapping the i/o page and granting i/o privilege would
* require sufficient privilege soon and nothing much can be done
* without them.
*/
error = suser(td);
if (error != 0)
return error;
error = securelevel_gt(td->td_ucred, 0);
if (error != 0)
return error;
#endif
ss->flags |= OPEN;
ss->p = 0;
ss->signal_num = 0;
return 0;
}
static int
spigot_close(dev_t dev, int flags, int fmt, struct thread *td)
{
struct spigot_softc *ss = (struct spigot_softc *)&spigot_softc[UNIT(dev)];
ss->flags &= ~OPEN;
ss->p = 0;
ss->signal_num = 0;
outb(0xad6, 0);
return 0;
}
static int
spigot_write(dev_t dev, struct uio *uio, int ioflag)
{
return ENXIO;
}
static int
spigot_read(dev_t dev, struct uio *uio, int ioflag)
{
return ENXIO;
}
static int
spigot_ioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct thread *td)
{
int error;
struct spigot_softc *ss = (struct spigot_softc *)&spigot_softc[UNIT(dev)];
struct spigot_info *info;
if(!data) return(EINVAL);
switch(cmd){
case SPIGOT_SETINT:
if (*(int *)data < 0 || *(int *)data > _SIG_MAXSIG)
return EINVAL;
ss->p = td->td_proc;
ss->signal_num = *((int *)data);
break;
case SPIGOT_IOPL_ON: /* allow access to the IO PAGE */
#if !defined(SPIGOT_UNSECURE)
error = suser(td);
if (error != 0)
return error;
error = securelevel_gt(td->td_ucred, 0);
if (error)
return error;
#endif
td->td_frame->tf_eflags |= PSL_IOPL;
break;
case SPIGOT_IOPL_OFF: /* deny access to the IO PAGE */
td->td_frame->tf_eflags &= ~PSL_IOPL;
break;
case SPIGOT_GET_INFO:
info = (struct spigot_info *)data;
info->maddr = ss->maddr;
info->irq = ss->irq;
break;
default:
return ENOTTY;
}
return 0;
}
/*
* Interrupt procedure.
* Just call a user level interrupt routine.
*/
static void
spigintr(int unit)
{
struct spigot_softc *ss = (struct spigot_softc *)&spigot_softc[unit];
if(ss->p && ss->signal_num) {
PROC_LOCK(ss->p);
psignal(ss->p, ss->signal_num);
PROC_UNLOCK(ss->p);
}
}
static int
spigot_mmap(dev_t dev, vm_offset_t offset, vm_paddr_t *paddr, int nprot)
{
struct spigot_softc *ss = (struct spigot_softc *)&spigot_softc[0];
if(offset != 0) {
printf("spigot mmap failed, offset = 0x%x != 0x0\n", offset);
return -1;
}
if(nprot & PROT_EXEC)
return -1;
*paddr = ss->maddr;
return 0;
}