243e5a88d5
regular user could panic the machine with a simple "tail /proc/curproc/mem" command. The problem was twofold: both kernfs and procfs didn't fill in the mnt_stat statfs struct (which would later lead to an integer divide fault in the vnode pager), and kernfs bogusly paniced if a bmap was attempted. Reviewed by: John Dyson
350 lines
7.4 KiB
C
350 lines
7.4 KiB
C
/*
|
|
* Copyright (c) 1992, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* This code is derived from software donated to Berkeley by
|
|
* Jan-Simon Pendry.
|
|
*
|
|
* 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 University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
|
|
*
|
|
* @(#)kernfs_vfsops.c 8.4 (Berkeley) 1/21/94
|
|
* $Id: kernfs_vfsops.c,v 1.8 1995/03/16 20:23:38 wollman Exp $
|
|
*/
|
|
|
|
/*
|
|
* Kernel params Filesystem
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/conf.h>
|
|
#include <sys/types.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/vnode.h>
|
|
#include <sys/mount.h>
|
|
#include <sys/namei.h>
|
|
#include <sys/malloc.h>
|
|
|
|
#include <miscfs/specfs/specdev.h>
|
|
#include <miscfs/kernfs/kernfs.h>
|
|
|
|
struct vnode *rrootvp;
|
|
|
|
int kernfs_statfs __P((struct mount *, struct statfs *, struct proc *));
|
|
|
|
/*
|
|
* Create a vnode for a character device.
|
|
*/
|
|
int
|
|
cdevvp(dev, vpp)
|
|
dev_t dev;
|
|
struct vnode **vpp;
|
|
{
|
|
register struct vnode *vp;
|
|
struct vnode *nvp;
|
|
int error;
|
|
|
|
if (dev == NODEV)
|
|
return (0);
|
|
error = getnewvnode(VT_NON, (struct mount *)0, spec_vnodeop_p, &nvp);
|
|
if (error) {
|
|
*vpp = 0;
|
|
return (error);
|
|
}
|
|
vp = nvp;
|
|
vp->v_type = VCHR;
|
|
nvp = checkalias(vp, dev, (struct mount *)0);
|
|
if (nvp) {
|
|
vput(vp);
|
|
vp = nvp;
|
|
}
|
|
*vpp = vp;
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
kernfs_init()
|
|
{
|
|
int cmaj;
|
|
int bmaj = major(rootdev);
|
|
int error = ENXIO;
|
|
|
|
#ifdef KERNFS_DIAGNOSTIC
|
|
printf("kernfs_init\n"); /* printed during system boot */
|
|
#endif
|
|
|
|
for (cmaj = 0; cmaj < nchrdev; cmaj++) {
|
|
if (cdevsw[cmaj].d_open == bdevsw[bmaj].d_open) {
|
|
dev_t cdev = makedev(cmaj, minor(rootdev));
|
|
error = cdevvp(cdev, &rrootvp);
|
|
if (error == 0)
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (error) {
|
|
printf("kernfs: no raw boot device\n");
|
|
rrootvp = 0;
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Mount the Kernel params filesystem
|
|
*/
|
|
int
|
|
kernfs_mount(mp, path, data, ndp, p)
|
|
struct mount *mp;
|
|
char *path;
|
|
caddr_t data;
|
|
struct nameidata *ndp;
|
|
struct proc *p;
|
|
{
|
|
int error = 0;
|
|
u_int size;
|
|
struct kernfs_mount *fmp;
|
|
struct vnode *rvp;
|
|
|
|
#ifdef KERNFS_DIAGNOSTIC
|
|
printf("kernfs_mount(mp = %x)\n", mp);
|
|
#endif
|
|
|
|
/*
|
|
* Update is a no-op
|
|
*/
|
|
if (mp->mnt_flag & MNT_UPDATE)
|
|
return (EOPNOTSUPP);
|
|
|
|
error = getnewvnode(VT_KERNFS, mp, kernfs_vnodeop_p, &rvp); /* XXX */
|
|
if (error)
|
|
return (error);
|
|
|
|
MALLOC(fmp, struct kernfs_mount *, sizeof(struct kernfs_mount),
|
|
M_UFSMNT, M_WAITOK); /* XXX */
|
|
rvp->v_type = VDIR;
|
|
rvp->v_flag |= VROOT;
|
|
#ifdef KERNFS_DIAGNOSTIC
|
|
printf("kernfs_mount: root vp = %x\n", rvp);
|
|
#endif
|
|
fmp->kf_root = rvp;
|
|
mp->mnt_flag |= MNT_LOCAL;
|
|
mp->mnt_data = (qaddr_t) fmp;
|
|
getnewfsid(mp, MOUNT_KERNFS);
|
|
|
|
(void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size);
|
|
bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
|
|
bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);
|
|
bcopy("kernfs", mp->mnt_stat.f_mntfromname, sizeof("kernfs"));
|
|
(void)kernfs_statfs(mp, &mp->mnt_stat, p);
|
|
#ifdef KERNFS_DIAGNOSTIC
|
|
printf("kernfs_mount: at %s\n", mp->mnt_stat.f_mntonname);
|
|
#endif
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
kernfs_start(mp, flags, p)
|
|
struct mount *mp;
|
|
int flags;
|
|
struct proc *p;
|
|
{
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
kernfs_unmount(mp, mntflags, p)
|
|
struct mount *mp;
|
|
int mntflags;
|
|
struct proc *p;
|
|
{
|
|
int error;
|
|
int flags = 0;
|
|
struct vnode *rootvp = VFSTOKERNFS(mp)->kf_root;
|
|
|
|
#ifdef KERNFS_DIAGNOSTIC
|
|
printf("kernfs_unmount(mp = %x)\n", mp);
|
|
#endif
|
|
|
|
if (mntflags & MNT_FORCE) {
|
|
/* kernfs can never be rootfs so don't check for it */
|
|
if (!doforce)
|
|
return (EINVAL);
|
|
flags |= FORCECLOSE;
|
|
}
|
|
|
|
/*
|
|
* Clear out buffer cache. I don't think we
|
|
* ever get anything cached at this level at the
|
|
* moment, but who knows...
|
|
*/
|
|
if (rootvp->v_usecount > 1)
|
|
return (EBUSY);
|
|
#ifdef KERNFS_DIAGNOSTIC
|
|
printf("kernfs_unmount: calling vflush\n");
|
|
#endif
|
|
error = vflush(mp, rootvp, flags);
|
|
if (error)
|
|
return (error);
|
|
|
|
#ifdef KERNFS_DIAGNOSTIC
|
|
vprint("kernfs root", rootvp);
|
|
#endif
|
|
/*
|
|
* Release reference on underlying root vnode
|
|
*/
|
|
vrele(rootvp);
|
|
/*
|
|
* And blow it away for future re-use
|
|
*/
|
|
vgone(rootvp);
|
|
/*
|
|
* Finally, throw away the kernfs_mount structure
|
|
*/
|
|
free(mp->mnt_data, M_UFSMNT); /* XXX */
|
|
mp->mnt_data = 0;
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
kernfs_root(mp, vpp)
|
|
struct mount *mp;
|
|
struct vnode **vpp;
|
|
{
|
|
struct vnode *vp;
|
|
|
|
#ifdef KERNFS_DIAGNOSTIC
|
|
printf("kernfs_root(mp = %x)\n", mp);
|
|
#endif
|
|
|
|
/*
|
|
* Return locked reference to root.
|
|
*/
|
|
vp = VFSTOKERNFS(mp)->kf_root;
|
|
VREF(vp);
|
|
VOP_LOCK(vp);
|
|
*vpp = vp;
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
kernfs_quotactl(mp, cmd, uid, arg, p)
|
|
struct mount *mp;
|
|
int cmd;
|
|
uid_t uid;
|
|
caddr_t arg;
|
|
struct proc *p;
|
|
{
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
int
|
|
kernfs_statfs(mp, sbp, p)
|
|
struct mount *mp;
|
|
struct statfs *sbp;
|
|
struct proc *p;
|
|
{
|
|
#ifdef KERNFS_DIAGNOSTIC
|
|
printf("kernfs_statfs(mp = %x)\n", mp);
|
|
#endif
|
|
|
|
sbp->f_type = MOUNT_KERNFS;
|
|
sbp->f_flags = 0;
|
|
sbp->f_bsize = DEV_BSIZE;
|
|
sbp->f_iosize = DEV_BSIZE;
|
|
sbp->f_blocks = 2; /* 1K to keep df happy */
|
|
sbp->f_bfree = 0;
|
|
sbp->f_bavail = 0;
|
|
sbp->f_files = 0;
|
|
sbp->f_ffree = 0;
|
|
if (sbp != &mp->mnt_stat) {
|
|
bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
|
|
bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
|
|
bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
kernfs_sync(mp, waitfor)
|
|
struct mount *mp;
|
|
int waitfor;
|
|
{
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Kernfs flat namespace lookup.
|
|
* Currently unsupported.
|
|
*/
|
|
int
|
|
kernfs_vget(mp, ino, vpp)
|
|
struct mount *mp;
|
|
ino_t ino;
|
|
struct vnode **vpp;
|
|
{
|
|
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
|
|
int
|
|
kernfs_fhtovp(mp, fhp, setgen, vpp)
|
|
struct mount *mp;
|
|
struct fid *fhp;
|
|
int setgen;
|
|
struct vnode **vpp;
|
|
{
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
int
|
|
kernfs_vptofh(vp, fhp)
|
|
struct vnode *vp;
|
|
struct fid *fhp;
|
|
{
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
struct vfsops kernfs_vfsops = {
|
|
kernfs_mount,
|
|
kernfs_start,
|
|
kernfs_unmount,
|
|
kernfs_root,
|
|
kernfs_quotactl,
|
|
kernfs_statfs,
|
|
kernfs_sync,
|
|
kernfs_vget,
|
|
kernfs_fhtovp,
|
|
kernfs_vptofh,
|
|
kernfs_init,
|
|
};
|
|
|
|
VFS_SET(kernfs_vfsops, kernfs, MOUNT_KERNFS, VFCF_SYNTHETIC);
|