707 lines
16 KiB
C
707 lines
16 KiB
C
/* $NetBSD: sys_process.c,v 1.80 2003/02/07 21:44:45 nathanw Exp $ */
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/*-
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* Copyright (c) 1993 Jan-Simon Pendry.
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* Copyright (c) 1994 Christopher G. Demetriou. All rights reserved.
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* Copyright (c) 1982, 1986, 1989, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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*
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* This code is derived from software contributed to Berkeley by
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* Jan-Simon Pendry.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)sys_process.c 8.1 (Berkeley) 6/10/93
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*/
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/*
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* References:
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* (1) Bach's "The Design of the UNIX Operating System",
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* (2) sys/miscfs/procfs from UCB's 4.4BSD-Lite distribution,
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* (3) the "4.4BSD Programmer's Reference Manual" published
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* by USENIX and O'Reilly & Associates.
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* The 4.4BSD PRM does a reasonably good job of documenting what the various
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* ptrace() requests should actually do, and its text is quoted several times
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* in this file.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: sys_process.c,v 1.80 2003/02/07 21:44:45 nathanw Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/errno.h>
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#include <sys/ptrace.h>
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#include <sys/uio.h>
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#include <sys/user.h>
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#include <sys/ras.h>
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#include <sys/mount.h>
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#include <sys/sa.h>
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#include <sys/syscallargs.h>
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#include <uvm/uvm_extern.h>
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#include <machine/reg.h>
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/* Macros to clear/set/test flags. */
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#define SET(t, f) (t) |= (f)
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#define CLR(t, f) (t) &= ~(f)
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#define ISSET(t, f) ((t) & (f))
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/*
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* Process debugging system call.
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*/
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int
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sys_ptrace(l, v, retval)
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struct lwp *l;
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void *v;
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register_t *retval;
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{
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struct sys_ptrace_args /* {
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syscallarg(int) req;
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syscallarg(pid_t) pid;
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syscallarg(caddr_t) addr;
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syscallarg(int) data;
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} */ *uap = v;
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struct proc *p = l->l_proc;
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struct lwp *lt, *lr;
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struct proc *t; /* target process */
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struct uio uio;
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struct iovec iov;
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struct ptrace_io_desc piod;
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int s, error, write, tmp;
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/* "A foolish consistency..." XXX */
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if (SCARG(uap, req) == PT_TRACE_ME)
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t = p;
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else {
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/* Find the process we're supposed to be operating on. */
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if ((t = pfind(SCARG(uap, pid))) == NULL)
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return (ESRCH);
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}
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/* Can't trace a process that's currently exec'ing. */
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if ((t->p_flag & P_INEXEC) != 0)
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return EAGAIN;
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/* Make sure we can operate on it. */
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switch (SCARG(uap, req)) {
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case PT_TRACE_ME:
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/* Saying that you're being traced is always legal. */
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break;
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case PT_ATTACH:
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case PT_DUMPCORE:
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/*
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* You can't attach to a process if:
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* (1) it's the process that's doing the attaching,
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*/
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if (t->p_pid == p->p_pid)
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return (EINVAL);
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/*
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* (2) it's a system process
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*/
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if (t->p_flag & P_SYSTEM)
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return (EPERM);
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/*
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* (3) it's already being traced, or
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*/
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if (ISSET(t->p_flag, P_TRACED))
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return (EBUSY);
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/*
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* (4) it's not owned by you, or is set-id on exec
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* (unless you're root), or...
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*/
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if ((t->p_cred->p_ruid != p->p_cred->p_ruid ||
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ISSET(t->p_flag, P_SUGID)) &&
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(error = suser(p->p_ucred, &p->p_acflag)) != 0)
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return (error);
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/*
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* (5) ...it's init, which controls the security level
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* of the entire system, and the system was not
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* compiled with permanently insecure mode turned on
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*/
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if (t == initproc && securelevel > -1)
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return (EPERM);
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/*
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* (6) the tracer is chrooted, and its root directory is
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* not at or above the root directory of the tracee
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*/
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if (!proc_isunder(t, p))
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return EPERM;
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break;
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case PT_READ_I:
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case PT_READ_D:
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case PT_WRITE_I:
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case PT_WRITE_D:
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case PT_CONTINUE:
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case PT_IO:
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case PT_KILL:
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case PT_DETACH:
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#ifdef PT_STEP
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case PT_STEP:
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#endif
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#ifdef PT_GETREGS
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case PT_GETREGS:
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#endif
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#ifdef PT_SETREGS
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case PT_SETREGS:
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#endif
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#ifdef PT_GETFPREGS
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case PT_GETFPREGS:
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#endif
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#ifdef PT_SETFPREGS
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case PT_SETFPREGS:
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#endif
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#ifdef __HAVE_PTRACE_MACHDEP
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PTRACE_MACHDEP_REQUEST_CASES
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#endif
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/*
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* You can't do what you want to the process if:
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* (1) It's not being traced at all,
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*/
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if (!ISSET(t->p_flag, P_TRACED))
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return (EPERM);
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/*
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* (2) it's being traced by procfs (which has
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* different signal delivery semantics),
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*/
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if (ISSET(t->p_flag, P_FSTRACE))
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return (EBUSY);
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/*
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* (3) it's not being traced by _you_, or
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*/
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if (t->p_pptr != p)
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return (EBUSY);
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/*
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* (4) it's not currently stopped.
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*/
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if (t->p_stat != SSTOP || !ISSET(t->p_flag, P_WAITED))
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return (EBUSY);
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break;
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default: /* It was not a legal request. */
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return (EINVAL);
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}
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/* Do single-step fixup if needed. */
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FIX_SSTEP(t);
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/*
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* XXX NJWLWP
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*
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* The entire ptrace interface needs work to be useful to a
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* process with multiple LWPs. For the moment, we'll kluge
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* this; memory access will be fine, but register access will
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* be weird.
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*/
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lt = proc_representative_lwp(t);
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/* Now do the operation. */
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write = 0;
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*retval = 0;
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tmp = 0;
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switch (SCARG(uap, req)) {
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case PT_TRACE_ME:
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/* Just set the trace flag. */
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SET(t->p_flag, P_TRACED);
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t->p_opptr = t->p_pptr;
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return (0);
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case PT_WRITE_I: /* XXX no separate I and D spaces */
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case PT_WRITE_D:
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#if defined(__HAVE_RAS)
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/*
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* Can't write to a RAS
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*/
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if ((t->p_nras != 0) &&
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(ras_lookup(t, SCARG(uap, addr)) != (caddr_t)-1)) {
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return (EACCES);
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}
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#endif
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write = 1;
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tmp = SCARG(uap, data);
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case PT_READ_I: /* XXX no separate I and D spaces */
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case PT_READ_D:
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/* write = 0 done above. */
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iov.iov_base = (caddr_t)&tmp;
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iov.iov_len = sizeof(tmp);
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uio.uio_iov = &iov;
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uio.uio_iovcnt = 1;
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uio.uio_offset = (off_t)(long)SCARG(uap, addr);
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uio.uio_resid = sizeof(tmp);
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uio.uio_segflg = UIO_SYSSPACE;
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uio.uio_rw = write ? UIO_WRITE : UIO_READ;
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uio.uio_procp = p;
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error = process_domem(p, t, &uio);
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if (!write)
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*retval = tmp;
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return (error);
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case PT_IO:
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error = copyin(SCARG(uap, addr), &piod, sizeof(piod));
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if (error)
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return (error);
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iov.iov_base = piod.piod_addr;
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iov.iov_len = piod.piod_len;
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uio.uio_iov = &iov;
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uio.uio_iovcnt = 1;
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uio.uio_offset = (off_t)(long)piod.piod_offs;
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uio.uio_resid = piod.piod_len;
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uio.uio_segflg = UIO_USERSPACE;
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uio.uio_procp = p;
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switch (piod.piod_op) {
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case PIOD_READ_D:
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case PIOD_READ_I:
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uio.uio_rw = UIO_READ;
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break;
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case PIOD_WRITE_D:
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case PIOD_WRITE_I:
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uio.uio_rw = UIO_WRITE;
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break;
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default:
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return (EINVAL);
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}
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error = process_domem(p, t, &uio);
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piod.piod_len -= uio.uio_resid;
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(void) copyout(&piod, SCARG(uap, addr), sizeof(piod));
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return (error);
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case PT_DUMPCORE:
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return coredump(lt);
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#ifdef PT_STEP
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case PT_STEP:
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/*
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* From the 4.4BSD PRM:
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* "Execution continues as in request PT_CONTINUE; however
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* as soon as possible after execution of at least one
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* instruction, execution stops again. [ ... ]"
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*/
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#endif
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case PT_CONTINUE:
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case PT_DETACH:
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/*
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* From the 4.4BSD PRM:
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* "The data argument is taken as a signal number and the
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* child's execution continues at location addr as if it
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* incurred that signal. Normally the signal number will
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* be either 0 to indicate that the signal that caused the
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* stop should be ignored, or that value fetched out of
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* the process's image indicating which signal caused
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* the stop. If addr is (int *)1 then execution continues
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* from where it stopped."
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*/
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/* Check that the data is a valid signal number or zero. */
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if (SCARG(uap, data) < 0 || SCARG(uap, data) >= NSIG)
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return (EINVAL);
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PHOLD(lt);
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/* If the address parameter is not (int *)1, set the pc. */
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if ((int *)SCARG(uap, addr) != (int *)1)
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if ((error = process_set_pc(lt, SCARG(uap, addr))) != 0)
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goto relebad;
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#ifdef PT_STEP
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/*
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* Arrange for a single-step, if that's requested and possible.
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*/
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error = process_sstep(lt, SCARG(uap, req) == PT_STEP);
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if (error)
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goto relebad;
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#endif
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PRELE(lt);
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if (SCARG(uap, req) == PT_DETACH) {
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/* give process back to original parent or init */
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if (t->p_opptr != t->p_pptr) {
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struct proc *pp = t->p_opptr;
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proc_reparent(t, pp ? pp : initproc);
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}
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/* not being traced any more */
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t->p_opptr = NULL;
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CLR(t->p_flag, P_TRACED|P_WAITED);
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}
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sendsig:
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/* Finally, deliver the requested signal (or none). */
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if (t->p_stat == SSTOP) {
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t->p_xstat = SCARG(uap, data);
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SCHED_LOCK(s);
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lr = proc_unstop(t);
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/*
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* If the target needs to take a signal, there
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* is no running LWP that will see it, and
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* there is a LWP sleeping interruptably, then
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* get it moving.
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*/
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if (lr && (t->p_xstat != 0))
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setrunnable(lr);
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SCHED_UNLOCK(s);
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} else {
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if (SCARG(uap, data) != 0)
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psignal(t, SCARG(uap, data));
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}
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return (0);
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relebad:
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PRELE(lt);
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return (error);
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case PT_KILL:
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/* just send the process a KILL signal. */
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SCARG(uap, data) = SIGKILL;
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goto sendsig; /* in PT_CONTINUE, above. */
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case PT_ATTACH:
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/*
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* Go ahead and set the trace flag.
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* Save the old parent (it's reset in
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* _DETACH, and also in kern_exit.c:wait4()
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* Reparent the process so that the tracing
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* proc gets to see all the action.
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* Stop the target.
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*/
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SET(t->p_flag, P_TRACED);
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t->p_opptr = t->p_pptr;
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if (t->p_pptr != p) {
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t->p_pptr->p_flag |= P_CHTRACED;
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proc_reparent(t, p);
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}
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SCARG(uap, data) = SIGSTOP;
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goto sendsig;
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#ifdef PT_SETREGS
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case PT_SETREGS:
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write = 1;
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#endif
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#ifdef PT_GETREGS
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case PT_GETREGS:
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/* write = 0 done above. */
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#endif
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#if defined(PT_SETREGS) || defined(PT_GETREGS)
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tmp = SCARG(uap, data);
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if (tmp != 0 && t->p_nlwps > 1) {
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LIST_FOREACH(lt, &t->p_lwps, l_sibling)
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if (lt->l_lid == tmp)
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break;
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if (lt == NULL)
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return (ESRCH);
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}
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if (!process_validregs(t))
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return (EINVAL);
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else {
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iov.iov_base = SCARG(uap, addr);
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iov.iov_len = sizeof(struct reg);
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uio.uio_iov = &iov;
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uio.uio_iovcnt = 1;
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uio.uio_offset = 0;
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uio.uio_resid = sizeof(struct reg);
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uio.uio_segflg = UIO_USERSPACE;
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uio.uio_rw = write ? UIO_WRITE : UIO_READ;
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uio.uio_procp = p;
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return (process_doregs(p, lt, &uio));
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}
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#endif
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#ifdef PT_SETFPREGS
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case PT_SETFPREGS:
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write = 1;
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#endif
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#ifdef PT_GETFPREGS
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case PT_GETFPREGS:
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/* write = 0 done above. */
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#endif
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#if defined(PT_SETFPREGS) || defined(PT_GETFPREGS)
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tmp = SCARG(uap, data);
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if (tmp != 0 && t->p_nlwps > 1) {
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LIST_FOREACH(lt, &t->p_lwps, l_sibling)
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if (lt->l_lid == tmp)
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break;
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if (lt == NULL)
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return (ESRCH);
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}
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if (!process_validfpregs(t))
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return (EINVAL);
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else {
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iov.iov_base = SCARG(uap, addr);
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iov.iov_len = sizeof(struct fpreg);
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uio.uio_iov = &iov;
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uio.uio_iovcnt = 1;
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uio.uio_offset = 0;
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uio.uio_resid = sizeof(struct fpreg);
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uio.uio_segflg = UIO_USERSPACE;
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uio.uio_rw = write ? UIO_WRITE : UIO_READ;
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uio.uio_procp = p;
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return (process_dofpregs(p, lt, &uio));
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}
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#endif
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#ifdef __HAVE_PTRACE_MACHDEP
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PTRACE_MACHDEP_REQUEST_CASES
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return (ptrace_machdep_dorequest(p, lt,
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SCARG(uap, req), SCARG(uap, addr),
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SCARG(uap, data)));
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#endif
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}
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#ifdef DIAGNOSTIC
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panic("ptrace: impossible");
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#endif
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return 0;
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}
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int
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process_doregs(curp, l, uio)
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struct proc *curp; /* tracer */
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struct lwp *l; /* traced */
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struct uio *uio;
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{
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#if defined(PT_GETREGS) || defined(PT_SETREGS)
|
|
int error;
|
|
struct reg r;
|
|
char *kv;
|
|
int kl;
|
|
|
|
if ((error = process_checkioperm(curp, l->l_proc)) != 0)
|
|
return error;
|
|
|
|
kl = sizeof(r);
|
|
kv = (char *) &r;
|
|
|
|
kv += uio->uio_offset;
|
|
kl -= uio->uio_offset;
|
|
if (kl < 0)
|
|
return (EINVAL);
|
|
if ((size_t) kl > uio->uio_resid)
|
|
kl = uio->uio_resid;
|
|
|
|
PHOLD(l);
|
|
|
|
error = process_read_regs(l, &r);
|
|
if (error == 0)
|
|
error = uiomove(kv, kl, uio);
|
|
if (error == 0 && uio->uio_rw == UIO_WRITE) {
|
|
if (l->l_stat != LSSTOP)
|
|
error = EBUSY;
|
|
else
|
|
error = process_write_regs(l, &r);
|
|
}
|
|
|
|
PRELE(l);
|
|
|
|
uio->uio_offset = 0;
|
|
return (error);
|
|
#else
|
|
return (EINVAL);
|
|
#endif
|
|
}
|
|
|
|
int
|
|
process_validregs(p)
|
|
struct proc *p;
|
|
{
|
|
|
|
#if defined(PT_SETREGS) || defined(PT_GETREGS)
|
|
return ((p->p_flag & P_SYSTEM) == 0);
|
|
#else
|
|
return (0);
|
|
#endif
|
|
}
|
|
|
|
int
|
|
process_dofpregs(curp, l, uio)
|
|
struct proc *curp; /* tracer */
|
|
struct lwp *l; /* traced */
|
|
struct uio *uio;
|
|
{
|
|
#if defined(PT_GETFPREGS) || defined(PT_SETFPREGS)
|
|
int error;
|
|
struct fpreg r;
|
|
char *kv;
|
|
int kl;
|
|
|
|
if ((error = process_checkioperm(curp, l->l_proc)) != 0)
|
|
return (error);
|
|
|
|
kl = sizeof(r);
|
|
kv = (char *) &r;
|
|
|
|
kv += uio->uio_offset;
|
|
kl -= uio->uio_offset;
|
|
if (kl < 0)
|
|
return (EINVAL);
|
|
if ((size_t) kl > uio->uio_resid)
|
|
kl = uio->uio_resid;
|
|
|
|
PHOLD(l);
|
|
|
|
error = process_read_fpregs(l, &r);
|
|
if (error == 0)
|
|
error = uiomove(kv, kl, uio);
|
|
if (error == 0 && uio->uio_rw == UIO_WRITE) {
|
|
if (l->l_stat != LSSTOP)
|
|
error = EBUSY;
|
|
else
|
|
error = process_write_fpregs(l, &r);
|
|
}
|
|
|
|
PRELE(l);
|
|
|
|
uio->uio_offset = 0;
|
|
return (error);
|
|
#else
|
|
return (EINVAL);
|
|
#endif
|
|
}
|
|
|
|
int
|
|
process_validfpregs(p)
|
|
struct proc *p;
|
|
{
|
|
|
|
#if defined(PT_SETFPREGS) || defined(PT_GETFPREGS)
|
|
return ((p->p_flag & P_SYSTEM) == 0);
|
|
#else
|
|
return (0);
|
|
#endif
|
|
}
|
|
|
|
int
|
|
process_domem(curp, p, uio)
|
|
struct proc *curp; /* tracer */
|
|
struct proc *p; /* traced */
|
|
struct uio *uio;
|
|
{
|
|
int error;
|
|
|
|
size_t len;
|
|
#ifdef PMAP_NEED_PROCWR
|
|
vaddr_t addr;
|
|
#endif
|
|
|
|
len = uio->uio_resid;
|
|
|
|
if (len == 0)
|
|
return (0);
|
|
|
|
#ifdef PMAP_NEED_PROCWR
|
|
addr = uio->uio_offset;
|
|
#endif
|
|
|
|
if ((error = process_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);
|
|
p->p_vmspace->vm_refcnt++; /* XXX */
|
|
error = uvm_io(&p->p_vmspace->vm_map, uio);
|
|
uvmspace_free(p->p_vmspace);
|
|
|
|
#ifdef PMAP_NEED_PROCWR
|
|
if (uio->uio_rw == UIO_WRITE)
|
|
pmap_procwr(p, addr, len);
|
|
#endif
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* 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
|
|
process_checkioperm(p, t)
|
|
struct proc *p, *t;
|
|
{
|
|
int error;
|
|
|
|
/*
|
|
* You cannot attach to a processes mem/regs if:
|
|
*
|
|
* (1) It is currently exec'ing
|
|
*/
|
|
if (ISSET(t->p_flag, P_INEXEC))
|
|
return (EAGAIN);
|
|
|
|
/*
|
|
* (2) 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);
|
|
|
|
/*
|
|
* (3) ...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);
|
|
|
|
/*
|
|
* (4) 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);
|
|
}
|