335 lines
8.6 KiB
C
335 lines
8.6 KiB
C
/* $NetBSD: procfs_ctl.c,v 1.19 2001/01/18 20:28:21 jdolecek Exp $ */
|
|
|
|
/*
|
|
* 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_ctl.c 8.4 (Berkeley) 6/15/94
|
|
*/
|
|
|
|
#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 <sys/ioctl.h>
|
|
#include <sys/tty.h>
|
|
#include <sys/resource.h>
|
|
#include <sys/resourcevar.h>
|
|
#include <sys/signalvar.h>
|
|
#include <sys/ptrace.h>
|
|
#include <miscfs/procfs/procfs.h>
|
|
|
|
#define PROCFS_CTL_ATTACH 1
|
|
#define PROCFS_CTL_DETACH 2
|
|
#define PROCFS_CTL_STEP 3
|
|
#define PROCFS_CTL_RUN 4
|
|
#define PROCFS_CTL_WAIT 5
|
|
|
|
static const vfs_namemap_t ctlnames[] = {
|
|
/* special /proc commands */
|
|
{ "attach", PROCFS_CTL_ATTACH },
|
|
{ "detach", PROCFS_CTL_DETACH },
|
|
{ "step", PROCFS_CTL_STEP },
|
|
{ "run", PROCFS_CTL_RUN },
|
|
{ "wait", PROCFS_CTL_WAIT },
|
|
{ 0 },
|
|
};
|
|
|
|
static const vfs_namemap_t signames[] = {
|
|
/* regular signal names */
|
|
{ "hup", SIGHUP }, { "int", SIGINT },
|
|
{ "quit", SIGQUIT }, { "ill", SIGILL },
|
|
{ "trap", SIGTRAP }, { "abrt", SIGABRT },
|
|
{ "iot", SIGIOT }, { "emt", SIGEMT },
|
|
{ "fpe", SIGFPE }, { "kill", SIGKILL },
|
|
{ "bus", SIGBUS }, { "segv", SIGSEGV },
|
|
{ "sys", SIGSYS }, { "pipe", SIGPIPE },
|
|
{ "alrm", SIGALRM }, { "term", SIGTERM },
|
|
{ "urg", SIGURG }, { "stop", SIGSTOP },
|
|
{ "tstp", SIGTSTP }, { "cont", SIGCONT },
|
|
{ "chld", SIGCHLD }, { "ttin", SIGTTIN },
|
|
{ "ttou", SIGTTOU }, { "io", SIGIO },
|
|
{ "xcpu", SIGXCPU }, { "xfsz", SIGXFSZ },
|
|
{ "vtalrm", SIGVTALRM }, { "prof", SIGPROF },
|
|
{ "winch", SIGWINCH }, { "info", SIGINFO },
|
|
{ "usr1", SIGUSR1 }, { "usr2", SIGUSR2 },
|
|
{ 0 },
|
|
};
|
|
|
|
int procfs_control __P((struct proc *, struct proc *, int, int));
|
|
|
|
/* Macros to clear/set/test flags. */
|
|
#define SET(t, f) (t) |= (f)
|
|
#define CLR(t, f) (t) &= ~(f)
|
|
#define ISSET(t, f) ((t) & (f))
|
|
|
|
int
|
|
procfs_control(curp, p, op, sig)
|
|
struct proc *curp;
|
|
struct proc *p;
|
|
int op, sig;
|
|
{
|
|
int s, error;
|
|
|
|
/*
|
|
* Attach - attaches the target process for debugging
|
|
* by the calling process.
|
|
*/
|
|
switch (op) {
|
|
case PROCFS_CTL_ATTACH:
|
|
/*
|
|
* You can't attach to a process if:
|
|
* (1) it's the process that's doing the attaching,
|
|
*/
|
|
if (p->p_pid == curp->p_pid)
|
|
return (EINVAL);
|
|
|
|
/*
|
|
* (2) it's already being traced, or
|
|
*/
|
|
if (ISSET(p->p_flag, P_TRACED))
|
|
return (EBUSY);
|
|
|
|
/*
|
|
* (3) it's not owned by you, or is set-id on exec
|
|
* (unless you're root), or...
|
|
*/
|
|
if ((p->p_cred->p_ruid != curp->p_cred->p_ruid ||
|
|
ISSET(p->p_flag, P_SUGID)) &&
|
|
(error = suser(curp->p_ucred, &curp->p_acflag)) != 0)
|
|
return (error);
|
|
|
|
/*
|
|
* (4) ...it's init, which controls the security level
|
|
* of the entire system, and the system was not
|
|
* compiled with permanently insecure mode turned
|
|
* on.
|
|
*/
|
|
if (p == initproc && securelevel > -1)
|
|
return (EPERM);
|
|
break;
|
|
|
|
/*
|
|
* Target process must be stopped, owned by (curp) and
|
|
* be set up for tracing (P_TRACED flag set).
|
|
* Allow DETACH to take place at any time for sanity.
|
|
* Allow WAIT any time, of course.
|
|
*
|
|
* Note that the semantics of DETACH are different here
|
|
* from ptrace(2).
|
|
*/
|
|
case PROCFS_CTL_DETACH:
|
|
case PROCFS_CTL_WAIT:
|
|
/*
|
|
* You can't do what you want to the process if:
|
|
* (1) It's not being traced at all,
|
|
*/
|
|
if (!ISSET(p->p_flag, P_TRACED))
|
|
return (EPERM);
|
|
|
|
/*
|
|
* (2) it's being traced by ptrace(2) (which has
|
|
* different signal delivery semantics), or
|
|
*/
|
|
if (!ISSET(p->p_flag, P_FSTRACE))
|
|
return (EBUSY);
|
|
|
|
/*
|
|
* (3) it's not being traced by _you_.
|
|
*/
|
|
if (p->p_pptr != curp)
|
|
return (EBUSY);
|
|
break;
|
|
|
|
default:
|
|
/*
|
|
* You can't do what you want to the process if:
|
|
* (1) It's not being traced at all,
|
|
*/
|
|
if (!ISSET(p->p_flag, P_TRACED))
|
|
return (EPERM);
|
|
|
|
/*
|
|
* (2) it's being traced by ptrace(2) (which has
|
|
* different signal delivery semantics),
|
|
*/
|
|
if (!ISSET(p->p_flag, P_FSTRACE))
|
|
return (EBUSY);
|
|
|
|
/*
|
|
* (3) it's not being traced by _you_, or
|
|
*/
|
|
if (p->p_pptr != curp)
|
|
return (EBUSY);
|
|
|
|
/*
|
|
* (4) it's not currently stopped.
|
|
*/
|
|
if (p->p_stat != SSTOP || !ISSET(p->p_flag, P_WAITED))
|
|
return (EBUSY);
|
|
break;
|
|
}
|
|
|
|
/* Do single-step fixup if needed. */
|
|
FIX_SSTEP(p);
|
|
|
|
switch (op) {
|
|
case PROCFS_CTL_ATTACH:
|
|
/*
|
|
* Go ahead and set the trace flag.
|
|
* Save the old parent (it's reset in
|
|
* _DETACH, and also in kern_exit.c:wait4()
|
|
* Reparent the process so that the tracing
|
|
* proc gets to see all the action.
|
|
* Stop the target.
|
|
*/
|
|
SET(p->p_flag, P_TRACED|P_FSTRACE);
|
|
p->p_oppid = p->p_pptr->p_pid;
|
|
if (p->p_pptr != curp)
|
|
proc_reparent(p, curp);
|
|
sig = SIGSTOP;
|
|
goto sendsig;
|
|
|
|
#ifdef PT_STEP
|
|
case PROCFS_CTL_STEP:
|
|
/*
|
|
* Step. Let the target process execute a single instruction.
|
|
*/
|
|
#endif
|
|
case PROCFS_CTL_RUN:
|
|
case PROCFS_CTL_DETACH:
|
|
#ifdef PT_STEP
|
|
PHOLD(p);
|
|
error = process_sstep(p, op == PROCFS_CTL_STEP);
|
|
PRELE(p);
|
|
if (error)
|
|
return (error);
|
|
#endif
|
|
|
|
if (op == PROCFS_CTL_DETACH) {
|
|
/* give process back to original parent */
|
|
if (p->p_oppid != p->p_pptr->p_pid) {
|
|
struct proc *pp;
|
|
|
|
pp = pfind(p->p_oppid);
|
|
proc_reparent(p, pp ? pp : initproc);
|
|
}
|
|
|
|
/* not being traced any more */
|
|
p->p_oppid = 0;
|
|
CLR(p->p_flag, P_TRACED|P_FSTRACE|P_WAITED);
|
|
}
|
|
|
|
sendsig:
|
|
/* Finally, deliver the requested signal (or none). */
|
|
if (p->p_stat == SSTOP) {
|
|
p->p_xstat = sig;
|
|
SCHED_LOCK(s);
|
|
setrunnable(p);
|
|
SCHED_UNLOCK(s);
|
|
} else {
|
|
if (sig != 0)
|
|
psignal(p, sig);
|
|
}
|
|
return (0);
|
|
|
|
case PROCFS_CTL_WAIT:
|
|
/*
|
|
* Wait for the target process to stop.
|
|
*/
|
|
while (p->p_stat != SSTOP && P_ZOMBIE(p)) {
|
|
error = tsleep(p, PWAIT|PCATCH, "procfsx", 0);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
panic("procfs_control");
|
|
}
|
|
|
|
int
|
|
procfs_doctl(curp, p, pfs, uio)
|
|
struct proc *curp;
|
|
struct pfsnode *pfs;
|
|
struct uio *uio;
|
|
struct proc *p;
|
|
{
|
|
int xlen;
|
|
int error;
|
|
char msg[PROCFS_CTLLEN+1];
|
|
const vfs_namemap_t *nm;
|
|
|
|
if (uio->uio_rw != UIO_WRITE)
|
|
return (EOPNOTSUPP);
|
|
|
|
xlen = PROCFS_CTLLEN;
|
|
error = vfs_getuserstr(uio, msg, &xlen);
|
|
if (error)
|
|
return (error);
|
|
|
|
/*
|
|
* Map signal names into signal generation
|
|
* or debug control. Unknown commands and/or signals
|
|
* return EOPNOTSUPP.
|
|
*
|
|
* Sending a signal while the process is being debugged
|
|
* also has the side effect of letting the target continue
|
|
* to run. There is no way to single-step a signal delivery.
|
|
*/
|
|
error = EOPNOTSUPP;
|
|
|
|
nm = vfs_findname(ctlnames, msg, xlen);
|
|
if (nm) {
|
|
error = procfs_control(curp, p, nm->nm_val, 0);
|
|
} else {
|
|
nm = vfs_findname(signames, msg, xlen);
|
|
if (nm) {
|
|
if (ISSET(p->p_flag, P_TRACED) &&
|
|
p->p_pptr == curp)
|
|
error = procfs_control(curp, p, PROCFS_CTL_RUN,
|
|
nm->nm_val);
|
|
else {
|
|
psignal(p, nm->nm_val);
|
|
error = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
return (error);
|
|
}
|