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/* $OpenBSD: procfs_cmdline.c,v 1.10 2012/03/10 05:54:28 guenther Exp $ */
/* $NetBSD: procfs_cmdline.c,v 1.3 1999/03/13 22:26:48 thorpej Exp $ */
/*
* Copyright (c) 1999 Jaromir Dolecek <dolecek@ics.muni.cz>
* Copyright (c) 1999 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jaromir Dolecek.
*
* 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/param.h>
#include <sys/types.h>
#include <sys/systm.h>
#include <sys/syslimits.h>
#include <sys/proc.h>
#include <sys/vnode.h>
#include <sys/exec.h>
#include <sys/malloc.h>
#include <miscfs/procfs/procfs.h>
#include <uvm/uvm_extern.h>
/*
* code for returning process's command line arguments
*/
int
procfs_docmdline(struct proc *curp, struct proc *p, struct pfsnode *pfs, struct uio *uio)
{
struct ps_strings pss;
int count, error, i;
size_t len, xlen, upper_bound;
struct uio auio;
struct iovec aiov;
struct vmspace *vm;
vaddr_t argv;
char *arg;
/* Don't allow writing. */
if (uio->uio_rw != UIO_READ)
return (EOPNOTSUPP);
/*
* Allocate a temporary buffer to hold the arguments.
*/
arg = malloc(PAGE_SIZE, M_TEMP, M_WAITOK);
/*
* Zombies don't have a stack, so we can't read their psstrings.
* System processes also don't have a user stack. This is what
* ps(1) would display.
*/
if (P_ZOMBIE(p) || (p->p_flag & P_SYSTEM) != 0) {
len = snprintf(arg, PAGE_SIZE, "(%s)", p->p_comm);
if (uio->uio_offset >= (off_t)len)
error = 0;
else
error = uiomove(arg, len - uio->uio_offset, uio);
free(arg, M_TEMP);
return (error);
}
/*
* NOTE: Don't bother doing a process_checkioperm() here
* because the psstrings info is available by using ps(1),
* so it's not like there's anything to protect here.
*/
/*
* Lock the process down in memory.
*/
/* XXXCDC: how should locking work here? */
if ((p->p_p->ps_flags & PS_EXITING) || (p->p_vmspace->vm_refcnt < 1)) {
free(arg, M_TEMP);
return (EFAULT);
}
vm = p->p_vmspace;
vm->vm_refcnt++; /* XXX */
/*
* Read in the ps_strings structure.
*/
aiov.iov_base = &pss;
aiov.iov_len = sizeof(pss);
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_offset = (vaddr_t)PS_STRINGS;
auio.uio_resid = sizeof(pss);
auio.uio_segflg = UIO_SYSSPACE;
auio.uio_rw = UIO_READ;
auio.uio_procp = NULL;
error = uvm_io(&vm->vm_map, &auio, 0);
if (error)
goto bad;
/*
* Now read the address of the argument vector.
*/
aiov.iov_base = &argv;
aiov.iov_len = sizeof(argv);
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_offset = (vaddr_t)pss.ps_argvstr;
auio.uio_resid = sizeof(argv);
auio.uio_segflg = UIO_SYSSPACE;
auio.uio_rw = UIO_READ;
auio.uio_procp = NULL;
error = uvm_io(&vm->vm_map, &auio, 0);
if (error)
goto bad;
/*
* Now copy in the actual argument vector, one byte at a time,
* since we don't know how long the vector is (though, we do
* know how many NUL-terminated strings are in the vector).
*/
len = 0;
count = pss.ps_nargvstr;
upper_bound = round_page(uio->uio_offset + uio->uio_resid);
for (; count && len < upper_bound; len += xlen) {
aiov.iov_base = arg;
aiov.iov_len = PAGE_SIZE;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_offset = argv + len;
xlen = PAGE_SIZE - ((argv + len) & PAGE_MASK);
auio.uio_resid = xlen;
auio.uio_segflg = UIO_SYSSPACE;
auio.uio_rw = UIO_READ;
auio.uio_procp = NULL;
error = uvm_io(&vm->vm_map, &auio, 0);
if (error)
goto bad;
for (i = 0; i < xlen && count != 0; i++) {
if (arg[i] == '\0')
count--; /* one full string */
}
if (count == 0)
i--; /* exclude the final NUL */
if (len + i > uio->uio_offset) {
/* Have data in this page, copy it out */
error = uiomove(arg + uio->uio_offset - len,
i + len - uio->uio_offset, uio);
if (error || uio->uio_resid <= 0)
break;
}
}
bad:
uvmspace_free(vm);
free(arg, M_TEMP);
return (error);
}
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