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freebsd/sys/miscfs/procfs/procfs_status.c
Poul-Henning Kamp a9e0361b4a Introduce the new function
p_trespass(struct proc *p1, struct proc *p2)
which returns zero or an errno depending on the legality of p1 trespassing
on p2.

Replace kern_sig.c:CANSIGNAL() with call to p_trespass() and one
extra signal related check.

Replace procfs.h:CHECKIO() macros with calls to p_trespass().

Only show command lines to process which can trespass on the target
process.
1999-11-21 19:03:20 +00:00

230 lines
6.1 KiB
C

/*
* Copyright (c) 1993 Jan-Simon Pendry
* 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.
*
* 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_status.c 8.4 (Berkeley) 6/15/94
*
* From:
* $FreeBSD$
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/proc.h>
#include <sys/jail.h>
#include <sys/vnode.h>
#include <sys/tty.h>
#include <sys/resourcevar.h>
#include <miscfs/procfs/procfs.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <vm/vm_param.h>
#include <sys/exec.h>
int
procfs_dostatus(curp, p, pfs, uio)
struct proc *curp;
struct proc *p;
struct pfsnode *pfs;
struct uio *uio;
{
struct session *sess;
struct tty *tp;
struct ucred *cr;
char *ps;
char *sep;
int pid, ppid, pgid, sid;
int i;
int xlen;
int error;
char psbuf[256]; /* XXX - conservative */
if (uio->uio_rw != UIO_READ)
return (EOPNOTSUPP);
pid = p->p_pid;
ppid = p->p_pptr ? p->p_pptr->p_pid : 0,
pgid = p->p_pgrp->pg_id;
sess = p->p_pgrp->pg_session;
sid = sess->s_leader ? sess->s_leader->p_pid : 0;
/* comm pid ppid pgid sid maj,min ctty,sldr start ut st wmsg
euid ruid rgid,egid,groups[1 .. NGROUPS]
*/
ps = psbuf;
bcopy(p->p_comm, ps, MAXCOMLEN);
ps[MAXCOMLEN] = '\0';
ps += strlen(ps);
ps += sprintf(ps, " %d %d %d %d ", pid, ppid, pgid, sid);
if ((p->p_flag&P_CONTROLT) && (tp = sess->s_ttyp))
ps += sprintf(ps, "%d,%d ", major(tp->t_dev), minor(tp->t_dev));
else
ps += sprintf(ps, "%d,%d ", -1, -1);
sep = "";
if (sess->s_ttyvp) {
ps += sprintf(ps, "%sctty", sep);
sep = ",";
}
if (SESS_LEADER(p)) {
ps += sprintf(ps, "%ssldr", sep);
sep = ",";
}
if (*sep != ',')
ps += sprintf(ps, "noflags");
if (p->p_flag & P_INMEM) {
struct timeval ut, st;
calcru(p, &ut, &st, (struct timeval *) NULL);
ps += sprintf(ps, " %ld,%ld %ld,%ld %ld,%ld",
p->p_stats->p_start.tv_sec,
p->p_stats->p_start.tv_usec,
ut.tv_sec, ut.tv_usec,
st.tv_sec, st.tv_usec);
} else
ps += sprintf(ps, " -1,-1 -1,-1 -1,-1");
ps += sprintf(ps, " %s",
(p->p_wchan && p->p_wmesg) ? p->p_wmesg : "nochan");
cr = p->p_ucred;
ps += sprintf(ps, " %lu %lu %lu",
(u_long)cr->cr_uid,
(u_long)p->p_cred->p_ruid,
(u_long)p->p_cred->p_rgid);
/* egid (p->p_cred->p_svgid) is equal to cr_ngroups[0]
see also getegid(2) in /sys/kern/kern_prot.c */
for (i = 0; i < cr->cr_ngroups; i++)
ps += sprintf(ps, ",%lu", (u_long)cr->cr_groups[i]);
if (p->p_prison)
ps += sprintf(ps, " %s", p->p_prison->pr_host);
else
ps += sprintf(ps, " -");
ps += sprintf(ps, "\n");
xlen = ps - psbuf;
xlen -= uio->uio_offset;
ps = psbuf + uio->uio_offset;
xlen = imin(xlen, uio->uio_resid);
if (xlen <= 0)
error = 0;
else
error = uiomove(ps, xlen, uio);
return (error);
}
int
procfs_docmdline(curp, p, pfs, uio)
struct proc *curp;
struct proc *p;
struct pfsnode *pfs;
struct uio *uio;
{
char *ps;
int xlen;
int error;
char *buf, *bp;
int buflen;
struct ps_strings pstr;
int i;
size_t bytes_left, done;
if (uio->uio_rw != UIO_READ)
return (EOPNOTSUPP);
/*
* If we are using the ps/cmdline caching, use that. Otherwise
* revert back to the old way which only implements full cmdline
* for the currept process and just p->p_comm for all other
* processes.
* Note that if the argv is no longer available, we deliberately
* don't fall back on p->p_comm or return an error: the authentic
* Linux behaviour is to return zero-length in this case.
*/
if (p->p_args && !p_trespass(curp, p)) {
bp = p->p_args->ar_args;
buflen = p->p_args->ar_length;
buf = 0;
} else if (p != curp) {
bp = p->p_comm;
buflen = MAXCOMLEN;
buf = 0;
} else {
buflen = 256;
MALLOC(buf, char *, buflen + 1, M_TEMP, M_WAITOK);
bp = buf;
ps = buf;
error = copyin((void*)PS_STRINGS, &pstr, sizeof(pstr));
if (error) {
FREE(buf, M_TEMP);
return (error);
}
bytes_left = buflen;
for (i = 0; bytes_left && (i < pstr.ps_nargvstr); i++) {
error = copyinstr(pstr.ps_argvstr[i], ps,
bytes_left, &done);
/* If too long or malformed, just truncate */
if (error) {
error = 0;
break;
}
ps += done;
bytes_left -= done;
}
buflen = ps - buf;
}
buflen -= uio->uio_offset;
ps = bp + uio->uio_offset;
xlen = min(buflen, uio->uio_resid);
if (xlen <= 0)
error = 0;
else
error = uiomove(ps, xlen, uio);
if (buf)
FREE(buf, M_TEMP);
return (error);
}