433 lines
9.9 KiB
C
433 lines
9.9 KiB
C
/*
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* Copyright (c) 1989 The Regents of the University of California.
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* All rights reserved.
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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: @(#)kern_ktrace.c 7.15 (Berkeley) 6/21/91
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* $Id: kern_ktrace.c,v 1.6 1993/09/15 22:30:35 cgd Exp $
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*/
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#include "param.h"
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#include "systm.h"
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#include "proc.h"
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#include "file.h"
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#include "namei.h"
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#include "vnode.h"
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#include "ktrace.h"
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#include "malloc.h"
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#include "syslog.h"
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void ktrwrite __P((struct vnode *vp, struct ktr_header *kth));
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struct ktr_header *
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ktrgetheader(type)
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int type;
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{
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register struct ktr_header *kth;
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struct proc *p = curproc; /* XXX */
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MALLOC(kth, struct ktr_header *, sizeof (struct ktr_header),
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M_TEMP, M_WAITOK);
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kth->ktr_type = type;
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microtime(&kth->ktr_time);
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kth->ktr_pid = p->p_pid;
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bcopy(p->p_comm, kth->ktr_comm, MAXCOMLEN);
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return (kth);
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}
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void
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ktrsyscall(vp, code, narg, args)
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struct vnode *vp;
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int code, narg, args[];
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{
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struct ktr_header *kth = ktrgetheader(KTR_SYSCALL);
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struct ktr_syscall *ktp;
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register len = sizeof(struct ktr_syscall) + (narg * sizeof(int));
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int *argp, i;
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MALLOC(ktp, struct ktr_syscall *, len, M_TEMP, M_WAITOK);
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ktp->ktr_code = code;
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ktp->ktr_narg = narg;
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argp = (int *)((char *)ktp + sizeof(struct ktr_syscall));
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for (i = 0; i < narg; i++)
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*argp++ = args[i];
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kth->ktr_buf = (caddr_t)ktp;
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kth->ktr_len = len;
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ktrwrite(vp, kth);
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FREE(ktp, M_TEMP);
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FREE(kth, M_TEMP);
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}
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void
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ktrsysret(vp, code, error, retval)
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struct vnode *vp;
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int code, error, retval;
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{
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struct ktr_header *kth = ktrgetheader(KTR_SYSRET);
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struct ktr_sysret ktp;
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ktp.ktr_code = code;
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ktp.ktr_error = error;
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ktp.ktr_retval = retval; /* what about val2 ? */
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kth->ktr_buf = (caddr_t)&ktp;
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kth->ktr_len = sizeof(struct ktr_sysret);
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ktrwrite(vp, kth);
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FREE(kth, M_TEMP);
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}
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void
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ktrnamei(vp, path)
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struct vnode *vp;
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char *path;
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{
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struct ktr_header *kth = ktrgetheader(KTR_NAMEI);
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kth->ktr_len = strlen(path);
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kth->ktr_buf = path;
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ktrwrite(vp, kth);
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FREE(kth, M_TEMP);
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}
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void
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ktrgenio(vp, fd, rw, iov, len, error)
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struct vnode *vp;
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int fd;
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enum uio_rw rw;
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register struct iovec *iov;
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int len, error;
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{
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struct ktr_header *kth = ktrgetheader(KTR_GENIO);
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register struct ktr_genio *ktp;
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register caddr_t cp;
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register int resid = len, cnt;
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if (error)
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return;
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MALLOC(ktp, struct ktr_genio *, sizeof(struct ktr_genio) + len,
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M_TEMP, M_WAITOK);
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ktp->ktr_fd = fd;
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ktp->ktr_rw = rw;
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cp = (caddr_t)((char *)ktp + sizeof (struct ktr_genio));
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while (resid > 0) {
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if ((cnt = iov->iov_len) > resid)
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cnt = resid;
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if (copyin(iov->iov_base, cp, (unsigned)cnt))
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goto done;
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cp += cnt;
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resid -= cnt;
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iov++;
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}
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kth->ktr_buf = (caddr_t)ktp;
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kth->ktr_len = sizeof (struct ktr_genio) + len;
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ktrwrite(vp, kth);
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done:
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FREE(kth, M_TEMP);
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FREE(ktp, M_TEMP);
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}
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void
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ktrpsig(vp, sig, action, mask, code)
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struct vnode *vp;
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sig_t action;
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int sig, mask, code;
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{
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struct ktr_header *kth = ktrgetheader(KTR_PSIG);
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struct ktr_psig kp;
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kp.signo = (char)sig;
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kp.action = action;
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kp.mask = mask;
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kp.code = code;
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kth->ktr_buf = (caddr_t)&kp;
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kth->ktr_len = sizeof (struct ktr_psig);
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ktrwrite(vp, kth);
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FREE(kth, M_TEMP);
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}
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/* Interface and common routines */
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/*
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* ktrace system call
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*/
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struct ktrace_args {
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char *fname;
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int ops;
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int facs;
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int pid;
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};
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/* ARGSUSED */
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int
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ktrace(curp, uap, retval)
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struct proc *curp;
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register struct ktrace_args *uap;
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int *retval;
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{
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register struct vnode *vp = NULL;
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register struct proc *p;
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struct pgrp *pg;
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int facs = uap->facs & ~KTRFAC_ROOT;
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int ops = KTROP(uap->ops);
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int descend = uap->ops & KTRFLAG_DESCEND;
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int ret = 0;
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int error = 0;
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struct nameidata nd;
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if (ops != KTROP_CLEAR) {
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/*
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* an operation which requires a file argument.
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*/
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nd.ni_segflg = UIO_USERSPACE;
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nd.ni_dirp = uap->fname;
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if (error = vn_open(&nd, curp, FREAD|FWRITE, 0))
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return (error);
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vp = nd.ni_vp;
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VOP_UNLOCK(vp);
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if (vp->v_type != VREG) {
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(void) vn_close(vp, FREAD|FWRITE, curp->p_ucred, curp);
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return (EACCES);
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}
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}
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/*
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* Clear all uses of the tracefile
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*/
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if (ops == KTROP_CLEARFILE) {
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for (p = (struct proc *)allproc; p != NULL; p = p->p_nxt) {
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if (p->p_tracep == vp) {
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if (ktrcanset(curp, p)) {
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p->p_tracep = NULL;
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p->p_traceflag = 0;
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(void) vn_close(vp, FREAD|FWRITE,
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p->p_ucred, p);
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} else
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error = EPERM;
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}
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}
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goto done;
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}
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/*
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* need something to (un)trace (XXX - why is this here?)
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*/
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if (!facs) {
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error = EINVAL;
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goto done;
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}
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/*
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* do it
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*/
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if (uap->pid < 0) {
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/*
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* by process group
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*/
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pg = pgfind(-uap->pid);
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if (pg == NULL) {
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error = ESRCH;
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goto done;
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}
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for (p = pg->pg_mem; p != NULL; p = p->p_pgrpnxt)
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if (descend)
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ret |= ktrsetchildren(curp, p, ops, facs, vp);
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else
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ret |= ktrops(curp, p, ops, facs, vp);
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} else {
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/*
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* by pid
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*/
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p = pfind(uap->pid);
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if (p == NULL) {
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error = ESRCH;
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goto done;
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}
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if (descend)
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ret |= ktrsetchildren(curp, p, ops, facs, vp);
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else
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ret |= ktrops(curp, p, ops, facs, vp);
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}
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if (!ret)
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error = EPERM;
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done:
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if (vp != NULL)
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(void) vn_close(vp, FWRITE, curp->p_ucred, curp);
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return (error);
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}
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int
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ktrops(curp, p, ops, facs, vp)
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struct proc *curp, *p;
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int ops, facs;
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struct vnode *vp;
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{
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if (!ktrcanset(curp, p))
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return (0);
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if (ops == KTROP_SET) {
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if (p->p_tracep != vp) {
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/*
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* if trace file already in use, relinquish
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*/
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if (p->p_tracep != NULL)
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vrele(p->p_tracep);
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VREF(vp);
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p->p_tracep = vp;
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}
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p->p_traceflag |= facs;
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if (curp->p_ucred->cr_uid == 0)
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p->p_traceflag |= KTRFAC_ROOT;
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} else {
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/* KTROP_CLEAR */
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if (((p->p_traceflag &= ~facs) & KTRFAC_MASK) == 0) {
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/* no more tracing */
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p->p_traceflag = 0;
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if (p->p_tracep != NULL) {
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vrele(p->p_tracep);
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p->p_tracep = NULL;
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}
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}
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}
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return (1);
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}
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int
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ktrsetchildren(curp, top, ops, facs, vp)
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struct proc *curp, *top;
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int ops, facs;
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struct vnode *vp;
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{
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register struct proc *p;
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register int ret = 0;
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p = top;
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for (;;) {
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ret |= ktrops(curp, p, ops, facs, vp);
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/*
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* If this process has children, descend to them next,
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* otherwise do any siblings, and if done with this level,
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* follow back up the tree (but not past top).
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*/
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if (p->p_cptr)
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p = p->p_cptr;
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else if (p == top)
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return (ret);
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else if (p->p_osptr)
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p = p->p_osptr;
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else for (;;) {
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p = p->p_pptr;
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if (p == top)
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return (ret);
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if (p->p_osptr) {
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p = p->p_osptr;
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break;
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}
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}
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}
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/*NOTREACHED*/
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}
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void
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ktrwrite(vp, kth)
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struct vnode *vp;
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register struct ktr_header *kth;
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{
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struct uio auio;
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struct iovec aiov[2];
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register struct proc *p = curproc; /* XXX */
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int error;
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if (vp == NULL)
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return;
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auio.uio_iov = &aiov[0];
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auio.uio_offset = 0;
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auio.uio_segflg = UIO_SYSSPACE;
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auio.uio_rw = UIO_WRITE;
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aiov[0].iov_base = (caddr_t)kth;
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aiov[0].iov_len = sizeof(struct ktr_header);
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auio.uio_resid = sizeof(struct ktr_header);
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auio.uio_iovcnt = 1;
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auio.uio_procp = (struct proc *)0;
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if (kth->ktr_len > 0) {
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auio.uio_iovcnt++;
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aiov[1].iov_base = kth->ktr_buf;
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aiov[1].iov_len = kth->ktr_len;
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auio.uio_resid += kth->ktr_len;
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}
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VOP_LOCK(vp);
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error = VOP_WRITE(vp, &auio, IO_UNIT|IO_APPEND, p->p_ucred);
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VOP_UNLOCK(vp);
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if (!error)
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return;
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/*
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* If error encountered, give up tracing on this vnode.
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*/
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log(LOG_NOTICE, "ktrace write failed, errno %d, tracing stopped\n",
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error);
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for (p = (struct proc *)allproc; p != NULL; p = p->p_nxt) {
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if (p->p_tracep == vp) {
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p->p_tracep = NULL;
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p->p_traceflag = 0;
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vrele(vp);
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}
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}
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}
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/*
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* Return true if caller has permission to set the ktracing state
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* of target. Essentially, the target can't possess any
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* more permissions than the caller. KTRFAC_ROOT signifies that
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* root previously set the tracing status on the target process, and
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* so, only root may further change it.
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*
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* TODO: check groups. use caller effective gid.
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*/
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int
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ktrcanset(callp, targetp)
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struct proc *callp, *targetp;
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{
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register struct pcred *caller = callp->p_cred;
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register struct pcred *target = targetp->p_cred;
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if ((caller->pc_ucred->cr_uid == target->p_ruid &&
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target->p_ruid == target->p_svuid &&
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caller->p_rgid == target->p_rgid && /* XXX */
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target->p_rgid == target->p_svgid &&
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(targetp->p_traceflag & KTRFAC_ROOT) == 0) ||
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caller->pc_ucred->cr_uid == 0)
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return (1);
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return (0);
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}
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