232 lines
6.2 KiB
C
232 lines
6.2 KiB
C
/* $NetBSD: procfs_mem.c,v 1.25 2000/06/28 02:44:07 mrg Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 1993 Jan-Simon Pendry
|
|
* Copyright (c) 1993 Sean Eric Fagan
|
|
* Copyright (c) 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* Jan-Simon Pendry and Sean Eric Fagan.
|
|
*
|
|
* 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.
|
|
*
|
|
* @(#)procfs_mem.c 8.5 (Berkeley) 6/15/94
|
|
*/
|
|
|
|
/*
|
|
* This is a lightly hacked and merged version
|
|
* of sef's pread/pwrite functions
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/time.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/vnode.h>
|
|
|
|
#include <miscfs/procfs/procfs.h>
|
|
|
|
#include <uvm/uvm_extern.h>
|
|
|
|
#define ISSET(t, f) ((t) & (f))
|
|
|
|
/*
|
|
* Copy data in and out of the target process.
|
|
* We do this by mapping the process's page into
|
|
* the kernel and then doing a uiomove direct
|
|
* from the kernel address space.
|
|
*/
|
|
int
|
|
procfs_domem(curp, p, pfs, uio)
|
|
struct proc *curp; /* tracer */
|
|
struct proc *p; /* traced */
|
|
struct pfsnode *pfs;
|
|
struct uio *uio;
|
|
{
|
|
int error;
|
|
|
|
size_t len;
|
|
vaddr_t addr;
|
|
|
|
len = uio->uio_resid;
|
|
|
|
if (len == 0)
|
|
return (0);
|
|
|
|
addr = uio->uio_offset;
|
|
|
|
if ((error = procfs_checkioperm(curp, p)) != 0)
|
|
return (error);
|
|
|
|
/* XXXCDC: how should locking work here? */
|
|
if ((p->p_flag & P_WEXIT) || (p->p_vmspace->vm_refcnt < 1))
|
|
return(EFAULT);
|
|
PHOLD(p);
|
|
p->p_vmspace->vm_refcnt++; /* XXX */
|
|
error = uvm_io(&p->p_vmspace->vm_map, uio);
|
|
PRELE(p);
|
|
uvmspace_free(p->p_vmspace);
|
|
|
|
#ifdef PMAP_NEED_PROCWR
|
|
if (uio->uio_rw == UIO_WRITE)
|
|
pmap_procwr(p, addr, len);
|
|
#endif
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Given process (p), find the vnode from which
|
|
* it's text segment is being executed.
|
|
*
|
|
* It would be nice to grab this information from
|
|
* the VM system, however, there is no sure-fire
|
|
* way of doing that. Instead, fork(), exec() and
|
|
* wait() all maintain the p_textvp field in the
|
|
* process proc structure which contains a held
|
|
* reference to the exec'ed vnode.
|
|
*/
|
|
struct vnode *
|
|
procfs_findtextvp(p)
|
|
struct proc *p;
|
|
{
|
|
|
|
return (p->p_textvp);
|
|
}
|
|
|
|
/*
|
|
* Ensure that a process has permission to perform I/O on another.
|
|
* Arguments:
|
|
* p The process wishing to do the I/O (the tracer).
|
|
* t The process who's memory/registers will be read/written.
|
|
*/
|
|
int
|
|
procfs_checkioperm(p, t)
|
|
struct proc *p, *t;
|
|
{
|
|
int error;
|
|
|
|
/*
|
|
* You cannot attach to a processes mem/regs if:
|
|
*
|
|
* (1) it's not owned by you, or is set-id on exec
|
|
* (unless you're root), or...
|
|
*/
|
|
if ((t->p_cred->p_ruid != p->p_cred->p_ruid ||
|
|
ISSET(t->p_flag, P_SUGID)) &&
|
|
(error = suser(p->p_ucred, &p->p_acflag)) != 0)
|
|
return (error);
|
|
|
|
/*
|
|
* (2) ...it's init, which controls the security level
|
|
* of the entire system, and the system was not
|
|
* compiled with permanetly insecure mode turned on.
|
|
*/
|
|
if (t == initproc && securelevel > -1)
|
|
return (EPERM);
|
|
|
|
/*
|
|
* (3) the tracer is chrooted, and its root directory is
|
|
* not at or above the root directory of the tracee
|
|
*/
|
|
|
|
if (!proc_isunder(t, p))
|
|
return EPERM;
|
|
|
|
return (0);
|
|
}
|
|
|
|
#ifdef probably_never
|
|
/*
|
|
* Given process (p), find the vnode from which
|
|
* it's text segment is being mapped.
|
|
*
|
|
* (This is here, rather than in procfs_subr in order
|
|
* to keep all the VM related code in one place.)
|
|
*/
|
|
struct vnode *
|
|
procfs_findtextvp(p)
|
|
struct proc *p;
|
|
{
|
|
int error;
|
|
vm_object_t object;
|
|
vaddr_t pageno; /* page number */
|
|
|
|
/* find a vnode pager for the user address space */
|
|
|
|
for (pageno = VM_MIN_ADDRESS;
|
|
pageno < VM_MAXUSER_ADDRESS;
|
|
pageno += PAGE_SIZE) {
|
|
vm_map_t map;
|
|
vm_map_entry_t out_entry;
|
|
vm_prot_t out_prot;
|
|
boolean_t wired, single_use;
|
|
vaddr_t off;
|
|
|
|
map = &p->p_vmspace->vm_map;
|
|
error = vm_map_lookup(&map, pageno,
|
|
VM_PROT_READ,
|
|
&out_entry, &object, &off, &out_prot,
|
|
&wired, &single_use);
|
|
|
|
if (!error) {
|
|
vm_pager_t pager;
|
|
|
|
printf("procfs: found vm object\n");
|
|
vm_map_lookup_done(map, out_entry);
|
|
printf("procfs: vm object = %p\n", object);
|
|
|
|
/*
|
|
* At this point, assuming no errors, object
|
|
* is the VM object mapping UVA (pageno).
|
|
* Ensure it has a vnode pager, then grab
|
|
* the vnode from that pager's handle.
|
|
*/
|
|
|
|
pager = object->pager;
|
|
printf("procfs: pager = %p\n", pager);
|
|
if (pager)
|
|
printf("procfs: found pager, type = %d\n",
|
|
pager->pg_type);
|
|
if (pager && pager->pg_type == PG_VNODE) {
|
|
struct vnode *vp;
|
|
|
|
vp = (struct vnode *) pager->pg_handle;
|
|
printf("procfs: vp = %p\n", vp);
|
|
return (vp);
|
|
}
|
|
}
|
|
}
|
|
|
|
printf("procfs: text object not found\n");
|
|
return (0);
|
|
}
|
|
#endif /* probably_never */
|