5abbf990f3
a boot string for firmware that can do this, such as the SPARC and the sun3 models. It is currently silently ignored on all other hardware now, however. The MD function "boot()" has been changed to also take a char *.
666 lines
14 KiB
C
666 lines
14 KiB
C
/* $NetBSD: kern_prot.c,v 1.36 1996/08/09 10:30:23 mrg Exp $ */
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/*
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* Copyright (c) 1982, 1986, 1989, 1990, 1991, 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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* 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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* @(#)kern_prot.c 8.6 (Berkeley) 1/21/94
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*/
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/*
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* System calls related to processes and protection
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*/
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#include <sys/param.h>
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#include <sys/acct.h>
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#include <sys/systm.h>
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#include <sys/ucred.h>
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#include <sys/proc.h>
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#include <sys/timeb.h>
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#include <sys/times.h>
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#include <sys/malloc.h>
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#include <sys/mount.h>
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#include <sys/syscallargs.h>
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/* ARGSUSED */
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int
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sys_getpid(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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*retval = p->p_pid;
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#if defined(COMPAT_43) || defined(COMPAT_SUNOS) || defined(COMPAT_IBCS2) || \
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defined(COMPAT_FREEBSD)
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retval[1] = p->p_pptr->p_pid;
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#endif
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return (0);
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}
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/* ARGSUSED */
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int
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sys_getppid(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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*retval = p->p_pptr->p_pid;
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return (0);
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}
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/* Get process group ID; note that POSIX getpgrp takes no parameter */
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int
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sys_getpgrp(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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*retval = p->p_pgrp->pg_id;
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return (0);
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}
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int
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sys_getpgid(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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register struct sys_getpgid_args /* {
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syscallarg(pid_t) pid;
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} */ *uap = v;
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if (SCARG(uap, pid) == 0)
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goto found;
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if ((p = pfind(SCARG(uap, pid))) == 0)
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return (ESRCH);
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found:
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*retval = p->p_pgid;
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return 0;
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}
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/* ARGSUSED */
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int
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sys_getuid(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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*retval = p->p_cred->p_ruid;
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#if defined(COMPAT_43) || defined(COMPAT_SUNOS) || defined(COMPAT_IBCS2) || \
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defined(COMPAT_FREEBSD)
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retval[1] = p->p_ucred->cr_uid;
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#endif
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return (0);
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}
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/* ARGSUSED */
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int
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sys_geteuid(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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*retval = p->p_ucred->cr_uid;
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return (0);
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}
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/* ARGSUSED */
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int
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sys_getgid(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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*retval = p->p_cred->p_rgid;
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#if defined(COMPAT_43) || defined(COMPAT_SUNOS) || defined(COMPAT_FREEBSD)
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retval[1] = p->p_ucred->cr_gid;
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#endif
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return (0);
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}
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/*
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* Get effective group ID. The "egid" is groups[0], and could be obtained
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* via getgroups. This syscall exists because it is somewhat painful to do
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* correctly in a library function.
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*/
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/* ARGSUSED */
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int
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sys_getegid(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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*retval = p->p_ucred->cr_gid;
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return (0);
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}
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int
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sys_getgroups(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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register struct sys_getgroups_args /* {
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syscallarg(u_int) gidsetsize;
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syscallarg(gid_t *) gidset;
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} */ *uap = v;
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register struct pcred *pc = p->p_cred;
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register u_int ngrp;
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int error;
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if ((ngrp = SCARG(uap, gidsetsize)) == 0) {
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*retval = pc->pc_ucred->cr_ngroups;
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return (0);
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}
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if (ngrp < pc->pc_ucred->cr_ngroups)
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return (EINVAL);
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ngrp = pc->pc_ucred->cr_ngroups;
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error = copyout((caddr_t)pc->pc_ucred->cr_groups,
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(caddr_t)SCARG(uap, gidset), ngrp * sizeof(gid_t));
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if (error)
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return (error);
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*retval = ngrp;
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return (0);
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}
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/* ARGSUSED */
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int
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sys_setsid(p, v, retval)
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register struct proc *p;
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void *v;
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register_t *retval;
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{
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if (p->p_pgid == p->p_pid || pgfind(p->p_pid)) {
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return (EPERM);
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} else {
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(void)enterpgrp(p, p->p_pid, 1);
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*retval = p->p_pid;
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return (0);
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}
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}
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/*
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* set process group (setpgid/old setpgrp)
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*
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* caller does setpgid(targpid, targpgid)
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*
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* pid must be caller or child of caller (ESRCH)
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* if a child
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* pid must be in same session (EPERM)
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* pid can't have done an exec (EACCES)
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* if pgid != pid
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* there must exist some pid in same session having pgid (EPERM)
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* pid must not be session leader (EPERM)
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*/
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/* ARGSUSED */
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int
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sys_setpgid(curp, v, retval)
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struct proc *curp;
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void *v;
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register_t *retval;
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{
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register struct sys_setpgid_args /* {
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syscallarg(int) pid;
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syscallarg(int) pgid;
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} */ *uap = v;
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register struct proc *targp; /* target process */
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register struct pgrp *pgrp; /* target pgrp */
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#ifdef COMPAT_09
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SCARG(uap, pid) = (short) SCARG(uap, pid); /* XXX */
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SCARG(uap, pgid) = (short) SCARG(uap, pgid); /* XXX */
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#endif
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if (SCARG(uap, pid) != 0 && SCARG(uap, pid) != curp->p_pid) {
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if ((targp = pfind(SCARG(uap, pid))) == 0 || !inferior(targp))
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return (ESRCH);
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if (targp->p_session != curp->p_session)
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return (EPERM);
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if (targp->p_flag & P_EXEC)
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return (EACCES);
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} else
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targp = curp;
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if (SESS_LEADER(targp))
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return (EPERM);
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if (SCARG(uap, pgid) == 0)
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SCARG(uap, pgid) = targp->p_pid;
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else if (SCARG(uap, pgid) != targp->p_pid)
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if ((pgrp = pgfind(SCARG(uap, pgid))) == 0 ||
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pgrp->pg_session != curp->p_session)
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return (EPERM);
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return (enterpgrp(targp, SCARG(uap, pgid), 0));
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}
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/* ARGSUSED */
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int
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sys_setuid(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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struct sys_setuid_args /* {
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syscallarg(uid_t) uid;
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} */ *uap = v;
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register struct pcred *pc = p->p_cred;
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register uid_t uid;
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int error;
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#ifdef COMPAT_09 /* XXX */
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uid = (u_short)SCARG(uap, uid);
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#else
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uid = SCARG(uap, uid);
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#endif
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if (uid != pc->p_ruid &&
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(error = suser(pc->pc_ucred, &p->p_acflag)))
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return (error);
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/*
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* Everything's okay, do it.
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* Transfer proc count to new user.
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* Copy credentials so other references do not see our changes.
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*/
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(void)chgproccnt(pc->p_ruid, -1);
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(void)chgproccnt(uid, 1);
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pc->pc_ucred = crcopy(pc->pc_ucred);
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pc->pc_ucred->cr_uid = uid;
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pc->p_ruid = uid;
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pc->p_svuid = uid;
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p->p_flag |= P_SUGID;
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return (0);
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}
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/* ARGSUSED */
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int
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sys_seteuid(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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struct sys_seteuid_args /* {
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syscallarg(uid_t) euid;
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} */ *uap = v;
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register struct pcred *pc = p->p_cred;
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register uid_t euid;
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int error;
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#ifdef COMPAT_09 /* XXX */
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euid = (u_short)SCARG(uap, euid);
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#else
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euid = SCARG(uap, euid);
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#endif
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if (euid != pc->p_ruid && euid != pc->p_svuid &&
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(error = suser(pc->pc_ucred, &p->p_acflag)))
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return (error);
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/*
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* Everything's okay, do it. Copy credentials so other references do
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* not see our changes.
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*/
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pc->pc_ucred = crcopy(pc->pc_ucred);
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pc->pc_ucred->cr_uid = euid;
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p->p_flag |= P_SUGID;
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return (0);
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}
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int
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sys_setreuid(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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struct sys_setreuid_args /* {
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syscallarg(uid_t) ruid;
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syscallarg(uid_t) euid;
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} */ *uap = v;
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register struct pcred *pc = p->p_cred;
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register uid_t ruid, euid;
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int error;
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ruid = SCARG(uap, ruid);
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euid = SCARG(uap, euid);
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if (ruid != (uid_t)-1 &&
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ruid != pc->p_ruid && ruid != pc->pc_ucred->cr_uid &&
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(error = suser(pc->pc_ucred, &p->p_acflag)))
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return (error);
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if (euid != (uid_t)-1 &&
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euid != pc->p_ruid && euid != pc->pc_ucred->cr_uid &&
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euid != pc->p_svuid &&
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(error = suser(pc->pc_ucred, &p->p_acflag)))
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return (error);
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if (euid != (uid_t)-1) {
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pc->pc_ucred = crcopy(pc->pc_ucred);
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pc->pc_ucred->cr_uid = euid;
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}
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if (ruid != (uid_t)-1) {
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(void)chgproccnt(pc->p_ruid, -1);
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(void)chgproccnt(ruid, 1);
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pc->p_ruid = ruid;
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pc->p_svuid = pc->pc_ucred->cr_uid;
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}
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if (euid != (uid_t)-1 && ruid != (uid_t)-1)
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p->p_flag |= P_SUGID;
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return (0);
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}
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/* ARGSUSED */
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int
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sys_setgid(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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struct sys_setgid_args /* {
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syscallarg(gid_t) gid;
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} */ *uap = v;
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register struct pcred *pc = p->p_cred;
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register gid_t gid;
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int error;
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#ifdef COMPAT_09 /* XXX */
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gid = (u_short)SCARG(uap, gid);
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#else
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gid = SCARG(uap, gid);
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#endif
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if (gid != pc->p_rgid &&
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(error = suser(pc->pc_ucred, &p->p_acflag)))
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return (error);
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pc->pc_ucred = crcopy(pc->pc_ucred);
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pc->pc_ucred->cr_gid = gid;
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pc->p_rgid = gid;
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pc->p_svgid = gid;
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p->p_flag |= P_SUGID;
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return (0);
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}
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/* ARGSUSED */
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int
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sys_setegid(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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struct sys_setegid_args /* {
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syscallarg(gid_t) egid;
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} */ *uap = v;
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register struct pcred *pc = p->p_cred;
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register gid_t egid;
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int error;
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#ifdef COMPAT_09 /* XXX */
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egid = (u_short)SCARG(uap, egid);
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#else
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egid = SCARG(uap, egid);
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#endif
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if (egid != pc->p_rgid && egid != pc->p_svgid &&
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(error = suser(pc->pc_ucred, &p->p_acflag)))
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return (error);
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pc->pc_ucred = crcopy(pc->pc_ucred);
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pc->pc_ucred->cr_gid = egid;
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p->p_flag |= P_SUGID;
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return (0);
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}
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int
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sys_setregid(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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struct sys_setregid_args /* {
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syscallarg(gid_t) rgid;
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syscallarg(gid_t) egid;
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} */ *uap = v;
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register struct pcred *pc = p->p_cred;
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register gid_t rgid, egid;
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int error;
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rgid = SCARG(uap, rgid);
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egid = SCARG(uap, egid);
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if (rgid != (gid_t)-1 &&
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rgid != pc->p_rgid && rgid != pc->pc_ucred->cr_gid &&
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(error = suser(pc->pc_ucred, &p->p_acflag)))
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return (error);
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if (egid != (gid_t)-1 &&
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egid != pc->p_rgid && egid != pc->pc_ucred->cr_gid &&
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egid != pc->p_svgid &&
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(error = suser(pc->pc_ucred, &p->p_acflag)))
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return (error);
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if (egid != (gid_t)-1) {
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pc->pc_ucred = crcopy(pc->pc_ucred);
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pc->pc_ucred->cr_gid = egid;
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}
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if (rgid != (gid_t)-1) {
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pc->p_rgid = rgid;
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pc->p_svgid = pc->pc_ucred->cr_gid;
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}
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if (egid != (gid_t)-1 && rgid != (gid_t)-1)
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p->p_flag |= P_SUGID;
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return (0);
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}
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/* ARGSUSED */
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int
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sys_setgroups(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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struct sys_setgroups_args /* {
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syscallarg(u_int) gidsetsize;
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syscallarg(gid_t *) gidset;
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} */ *uap = v;
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register struct pcred *pc = p->p_cred;
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register u_int ngrp;
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int error;
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if ((error = suser(pc->pc_ucred, &p->p_acflag)) != 0)
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return (error);
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ngrp = SCARG(uap, gidsetsize);
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if (ngrp > NGROUPS)
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return (EINVAL);
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pc->pc_ucred = crcopy(pc->pc_ucred);
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error = copyin((caddr_t)SCARG(uap, gidset),
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(caddr_t)pc->pc_ucred->cr_groups, ngrp * sizeof(gid_t));
|
|
if (error)
|
|
return (error);
|
|
pc->pc_ucred->cr_ngroups = ngrp;
|
|
p->p_flag |= P_SUGID;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Check if gid is a member of the group set.
|
|
*/
|
|
int
|
|
groupmember(gid, cred)
|
|
gid_t gid;
|
|
register struct ucred *cred;
|
|
{
|
|
register gid_t *gp;
|
|
gid_t *egp;
|
|
|
|
egp = &(cred->cr_groups[cred->cr_ngroups]);
|
|
for (gp = cred->cr_groups; gp < egp; gp++)
|
|
if (*gp == gid)
|
|
return (1);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Test whether the specified credentials imply "super-user"
|
|
* privilege; if so, and we have accounting info, set the flag
|
|
* indicating use of super-powers.
|
|
* Returns 0 or error.
|
|
*/
|
|
int
|
|
suser(cred, acflag)
|
|
struct ucred *cred;
|
|
u_short *acflag;
|
|
{
|
|
if (cred->cr_uid == 0) {
|
|
if (acflag)
|
|
*acflag |= ASU;
|
|
return (0);
|
|
}
|
|
return (EPERM);
|
|
}
|
|
|
|
/*
|
|
* Allocate a zeroed cred structure.
|
|
*/
|
|
struct ucred *
|
|
crget()
|
|
{
|
|
register struct ucred *cr;
|
|
|
|
MALLOC(cr, struct ucred *, sizeof(*cr), M_CRED, M_WAITOK);
|
|
bzero((caddr_t)cr, sizeof(*cr));
|
|
cr->cr_ref = 1;
|
|
return (cr);
|
|
}
|
|
|
|
/*
|
|
* Free a cred structure.
|
|
* Throws away space when ref count gets to 0.
|
|
*/
|
|
void
|
|
crfree(cr)
|
|
struct ucred *cr;
|
|
{
|
|
int s;
|
|
|
|
s = splimp(); /* ??? */
|
|
if (--cr->cr_ref == 0)
|
|
FREE((caddr_t)cr, M_CRED);
|
|
(void) splx(s);
|
|
}
|
|
|
|
/*
|
|
* Copy cred structure to a new one and free the old one.
|
|
*/
|
|
struct ucred *
|
|
crcopy(cr)
|
|
struct ucred *cr;
|
|
{
|
|
struct ucred *newcr;
|
|
|
|
if (cr->cr_ref == 1)
|
|
return (cr);
|
|
newcr = crget();
|
|
*newcr = *cr;
|
|
crfree(cr);
|
|
newcr->cr_ref = 1;
|
|
return (newcr);
|
|
}
|
|
|
|
/*
|
|
* Dup cred struct to a new held one.
|
|
*/
|
|
struct ucred *
|
|
crdup(cr)
|
|
struct ucred *cr;
|
|
{
|
|
struct ucred *newcr;
|
|
|
|
newcr = crget();
|
|
*newcr = *cr;
|
|
newcr->cr_ref = 1;
|
|
return (newcr);
|
|
}
|
|
|
|
/*
|
|
* Get login name, if available.
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
sys_getlogin(p, v, retval)
|
|
struct proc *p;
|
|
void *v;
|
|
register_t *retval;
|
|
{
|
|
struct sys_getlogin_args /* {
|
|
syscallarg(char *) namebuf;
|
|
syscallarg(u_int) namelen;
|
|
} */ *uap = v;
|
|
|
|
if (SCARG(uap, namelen) > sizeof (p->p_pgrp->pg_session->s_login))
|
|
SCARG(uap, namelen) = sizeof (p->p_pgrp->pg_session->s_login);
|
|
return (copyout((caddr_t) p->p_pgrp->pg_session->s_login,
|
|
(caddr_t) SCARG(uap, namebuf), SCARG(uap, namelen)));
|
|
}
|
|
|
|
/*
|
|
* Set login name.
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
sys_setlogin(p, v, retval)
|
|
struct proc *p;
|
|
void *v;
|
|
register_t *retval;
|
|
{
|
|
struct sys_setlogin_args /* {
|
|
syscallarg(char *) namebuf;
|
|
} */ *uap = v;
|
|
int error;
|
|
|
|
if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
|
|
return (error);
|
|
error = copyinstr((caddr_t) SCARG(uap, namebuf),
|
|
(caddr_t) p->p_pgrp->pg_session->s_login,
|
|
sizeof (p->p_pgrp->pg_session->s_login) - 1, (size_t *)0);
|
|
if (error == ENAMETOOLONG)
|
|
error = EINVAL;
|
|
return (error);
|
|
}
|