680 lines
15 KiB
C
680 lines
15 KiB
C
/* $NetBSD: kern_ktrace.c,v 1.40 2000/05/08 20:01:05 thorpej Exp $ */
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/*
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. 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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* @(#)kern_ktrace.c 8.5 (Berkeley) 5/14/95
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*/
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#include "opt_ktrace.h"
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#ifdef KTRACE
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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/file.h>
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#include <sys/namei.h>
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#include <sys/vnode.h>
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#include <sys/ktrace.h>
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#include <sys/malloc.h>
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#include <sys/syslog.h>
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#include <sys/filedesc.h>
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#include <sys/mount.h>
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#include <sys/syscallargs.h>
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void ktrinitheader __P((struct ktr_header *, struct proc *, int));
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int ktrops __P((struct proc *, struct proc *, int, int, void *));
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int ktrsetchildren __P((struct proc *, struct proc *, int, int, void *));
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int ktrwrite __P((struct proc *, void *, struct ktr_header *));
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int ktrcanset __P((struct proc *, struct proc *));
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void
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ktrderef(p)
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struct proc *p;
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{
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if (p->p_tracep == NULL)
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return;
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if (p->p_traceflag & KTRFAC_FD) {
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struct file *fp = p->p_tracep;
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FILE_USE(fp);
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closef(fp, NULL);
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} else {
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struct vnode *vp = p->p_tracep;
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vrele(vp);
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}
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p->p_tracep = NULL;
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p->p_traceflag = 0;
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}
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void
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ktradref(p)
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struct proc *p;
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{
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if (p->p_traceflag & KTRFAC_FD) {
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struct file *fp = p->p_tracep;
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fp->f_count++;
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} else {
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struct vnode *vp = p->p_tracep;
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VREF(vp);
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}
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}
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void
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ktrinitheader(kth, p, type)
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struct ktr_header *kth;
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struct proc *p;
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int type;
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{
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memset(kth, 0, sizeof(*kth));
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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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memcpy(kth->ktr_comm, p->p_comm, MAXCOMLEN);
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}
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void
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ktrsyscall(v, code, argsize, args)
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void *v;
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register_t code;
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size_t argsize;
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register_t args[];
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{
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struct ktr_header kth;
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struct ktr_syscall *ktp;
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struct proc *p = curproc; /* XXX */
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register_t *argp;
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size_t len = sizeof(struct ktr_syscall) + argsize;
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int i;
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p->p_traceflag |= KTRFAC_ACTIVE;
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ktrinitheader(&kth, p, KTR_SYSCALL);
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ktp = malloc(len, M_TEMP, M_WAITOK);
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ktp->ktr_code = code;
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ktp->ktr_argsize = argsize;
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argp = (register_t *)((char *)ktp + sizeof(struct ktr_syscall));
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for (i = 0; i < (argsize / sizeof(*argp)); 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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(void) ktrwrite(p, v, &kth);
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free(ktp, M_TEMP);
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p->p_traceflag &= ~KTRFAC_ACTIVE;
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}
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void
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ktrsysret(v, code, error, retval)
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void *v;
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register_t code;
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int error;
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register_t retval;
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{
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struct ktr_header kth;
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struct ktr_sysret ktp;
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struct proc *p = curproc; /* XXX */
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p->p_traceflag |= KTRFAC_ACTIVE;
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ktrinitheader(&kth, p, KTR_SYSRET);
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ktp.ktr_code = code;
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ktp.ktr_eosys = 0; /* XXX unused */
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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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(void) ktrwrite(p, v, &kth);
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p->p_traceflag &= ~KTRFAC_ACTIVE;
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}
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void
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ktrnamei(v, path)
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void *v;
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char *path;
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{
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struct ktr_header kth;
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struct proc *p = curproc; /* XXX */
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p->p_traceflag |= KTRFAC_ACTIVE;
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ktrinitheader(&kth, p, KTR_NAMEI);
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kth.ktr_len = strlen(path);
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kth.ktr_buf = path;
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(void) ktrwrite(p, v, &kth);
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p->p_traceflag &= ~KTRFAC_ACTIVE;
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}
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void
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ktremul(v, p, emul)
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void *v;
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struct proc *p;
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char *emul;
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{
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struct ktr_header kth;
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p->p_traceflag |= KTRFAC_ACTIVE;
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ktrinitheader(&kth, p, KTR_EMUL);
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kth.ktr_len = strlen(emul);
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kth.ktr_buf = emul;
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(void) ktrwrite(p, v, &kth);
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p->p_traceflag &= ~KTRFAC_ACTIVE;
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}
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void
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ktrgenio(v, fd, rw, iov, len, error)
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void *v;
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int fd;
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enum uio_rw rw;
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struct iovec *iov;
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int len, error;
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{
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struct ktr_header kth;
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struct ktr_genio *ktp;
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caddr_t cp;
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int resid = len, cnt;
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struct proc *p = curproc; /* XXX */
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int buflen;
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if (error)
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return;
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p->p_traceflag |= KTRFAC_ACTIVE;
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buflen = min(PAGE_SIZE, len + sizeof(struct ktr_genio));
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ktrinitheader(&kth, p, KTR_GENIO);
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ktp = malloc(buflen, M_TEMP, M_WAITOK);
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ktp->ktr_fd = fd;
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ktp->ktr_rw = rw;
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kth.ktr_buf = (caddr_t)ktp;
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cp = (caddr_t)((char *)ktp + sizeof(struct ktr_genio));
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buflen -= sizeof(struct ktr_genio);
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while (resid > 0) {
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if (p->p_schedflags & PSCHED_SHOULDYIELD)
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preempt(NULL);
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cnt = min(iov->iov_len, buflen);
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if (cnt > resid)
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cnt = resid;
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if (copyin(iov->iov_base, cp, cnt))
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break;
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kth.ktr_len = cnt + sizeof(struct ktr_genio);
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if (__predict_false(ktrwrite(p, v, &kth) != 0))
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break;
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iov->iov_base = (caddr_t)iov->iov_base + cnt;
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iov->iov_len -= cnt;
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if (iov->iov_len == 0)
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iov++;
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resid -= cnt;
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}
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free(ktp, M_TEMP);
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p->p_traceflag &= ~KTRFAC_ACTIVE;
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}
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void
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ktrpsig(v, sig, action, mask, code)
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void *v;
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int sig;
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sig_t action;
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sigset_t *mask;
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int code;
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{
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struct ktr_header kth;
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struct ktr_psig kp;
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struct proc *p = curproc; /* XXX */
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p->p_traceflag |= KTRFAC_ACTIVE;
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ktrinitheader(&kth, p, KTR_PSIG);
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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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(void) ktrwrite(p, v, &kth);
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p->p_traceflag &= ~KTRFAC_ACTIVE;
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}
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void
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ktrcsw(v, out, user)
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void *v;
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int out, user;
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{
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struct ktr_header kth;
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struct ktr_csw kc;
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struct proc *p = curproc; /* XXX */
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p->p_traceflag |= KTRFAC_ACTIVE;
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ktrinitheader(&kth, p, KTR_CSW);
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kc.out = out;
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kc.user = user;
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kth.ktr_buf = (caddr_t)&kc;
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kth.ktr_len = sizeof(struct ktr_csw);
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(void) ktrwrite(p, v, &kth);
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p->p_traceflag &= ~KTRFAC_ACTIVE;
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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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/* ARGSUSED */
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int
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sys_fktrace(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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struct sys_fktrace_args /* {
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syscallarg(int) fd;
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syscallarg(int) ops;
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syscallarg(int) facs;
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syscallarg(int) pid;
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} */ *uap = v;
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struct file *fp = NULL;
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struct proc *p;
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struct filedesc *fdp = curp->p_fd;
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struct pgrp *pg;
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int facs;
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int ops;
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int descend;
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int ret = 0;
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int error = 0;
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if (((u_int)SCARG(uap, fd)) >= fdp->fd_nfiles ||
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(fp = fdp->fd_ofiles[SCARG(uap, fd)]) == NULL ||
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(fp->f_flag & FWRITE) == 0)
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return (EBADF);
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ops = KTROP(SCARG(uap, ops)) | KTRFLAG_FD;
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descend = SCARG(uap, ops) & KTRFLAG_DESCEND;
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facs = SCARG(uap, facs) & ~((unsigned) KTRFAC_ROOT);
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curp->p_traceflag |= KTRFAC_ACTIVE;
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/*
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* Clear all uses of the tracefile
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*/
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if (KTROP(ops) == KTROP_CLEARFILE) {
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proclist_lock_read();
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for (p = LIST_FIRST(&allproc); p != NULL;
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p = LIST_NEXT(p, p_list)) {
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if (p->p_tracep == fp) {
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if (ktrcanset(curp, p))
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ktrderef(p);
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else
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error = EPERM;
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}
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}
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proclist_unlock_read();
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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 (SCARG(uap, pid) < 0) {
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/*
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* by process group
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*/
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pg = pgfind(-SCARG(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 = LIST_FIRST(&pg->pg_members); p != NULL;
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p = LIST_NEXT(p, p_pglist)) {
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if (descend)
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ret |= ktrsetchildren(curp, p, ops, facs, fp);
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else
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ret |= ktrops(curp, p, ops, facs, fp);
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}
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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(SCARG(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, fp);
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else
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ret |= ktrops(curp, p, ops, facs, fp);
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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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curp->p_traceflag &= ~KTRFAC_ACTIVE;
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return (error);
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}
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/*
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* ktrace system call
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*/
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/* ARGSUSED */
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int
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sys_ktrace(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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struct sys_ktrace_args /* {
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syscallarg(const char *) fname;
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syscallarg(int) ops;
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syscallarg(int) facs;
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syscallarg(int) pid;
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} */ *uap = v;
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struct vnode *vp = NULL;
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struct proc *p;
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struct pgrp *pg;
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int facs = SCARG(uap, facs) & ~((unsigned) KTRFAC_ROOT);
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int ops = KTROP(SCARG(uap, ops));
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int descend = SCARG(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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curp->p_traceflag |= KTRFAC_ACTIVE;
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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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NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, fname),
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curp);
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if ((error = vn_open(&nd, FREAD|FWRITE, 0)) != 0) {
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curp->p_traceflag &= ~KTRFAC_ACTIVE;
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return (error);
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}
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vp = nd.ni_vp;
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VOP_UNLOCK(vp, 0);
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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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curp->p_traceflag &= ~KTRFAC_ACTIVE;
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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 (KTROP(ops) == KTROP_CLEARFILE) {
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proclist_lock_read();
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for (p = LIST_FIRST(&allproc); p != NULL;
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p = LIST_NEXT(p, p_list)) {
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if (p->p_tracep == vp &&
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!ktrops(curp, p, KTROP_CLEAR, ~0, vp))
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error = EPERM;
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}
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proclist_unlock_read();
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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 (SCARG(uap, pid) < 0) {
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/*
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* by process group
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*/
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pg = pgfind(-SCARG(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 = LIST_FIRST(&pg->pg_members); p != NULL;
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p = LIST_NEXT(p, p_pglist)) {
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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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} else {
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/*
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* by pid
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*/
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p = pfind(SCARG(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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curp->p_traceflag &= ~KTRFAC_ACTIVE;
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return (error);
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}
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int
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ktrops(curp, p, ops, facs, v)
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struct proc *p, *curp;
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int ops, facs;
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void *v;
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{
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if (!ktrcanset(curp, p))
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return (0);
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if (KTROP(ops) == KTROP_SET) {
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if (p->p_tracep != v) {
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/*
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* if trace file already in use, relinquish
|
|
*/
|
|
ktrderef(p);
|
|
if (ops & KTRFLAG_FD)
|
|
p->p_traceflag = KTRFAC_FD;
|
|
p->p_tracep = v;
|
|
ktradref(p);
|
|
}
|
|
p->p_traceflag |= facs;
|
|
if (curp->p_ucred->cr_uid == 0)
|
|
p->p_traceflag |= KTRFAC_ROOT;
|
|
} else {
|
|
/* KTROP_CLEAR */
|
|
if (((p->p_traceflag &= ~facs) & KTRFAC_MASK) == 0) {
|
|
/* no more tracing */
|
|
ktrderef(p);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Emit an emulation record, every time there is a ktrace
|
|
* change/attach request.
|
|
*/
|
|
if (KTRPOINT(p, KTR_EMUL))
|
|
ktremul(p->p_tracep, p, p->p_emul->e_name);
|
|
|
|
return (1);
|
|
}
|
|
|
|
int
|
|
ktrsetchildren(curp, top, ops, facs, v)
|
|
struct proc *curp, *top;
|
|
int ops, facs;
|
|
void *v;
|
|
{
|
|
struct proc *p;
|
|
int ret = 0;
|
|
|
|
p = top;
|
|
for (;;) {
|
|
ret |= ktrops(curp, p, ops, facs, v);
|
|
/*
|
|
* If this process has children, descend to them next,
|
|
* otherwise do any siblings, and if done with this level,
|
|
* follow back up the tree (but not past top).
|
|
*/
|
|
if (LIST_FIRST(&p->p_children) != NULL)
|
|
p = LIST_FIRST(&p->p_children);
|
|
else for (;;) {
|
|
if (p == top)
|
|
return (ret);
|
|
if (LIST_NEXT(p, p_sibling) != NULL) {
|
|
p = LIST_NEXT(p, p_sibling);
|
|
break;
|
|
}
|
|
p = p->p_pptr;
|
|
}
|
|
}
|
|
/*NOTREACHED*/
|
|
}
|
|
|
|
int
|
|
ktrwrite(p, v, kth)
|
|
struct proc *p;
|
|
void *v;
|
|
struct ktr_header *kth;
|
|
{
|
|
struct uio auio;
|
|
struct iovec aiov[2];
|
|
int error;
|
|
|
|
if (v == NULL)
|
|
return (0);
|
|
auio.uio_iov = &aiov[0];
|
|
auio.uio_offset = 0;
|
|
auio.uio_segflg = UIO_SYSSPACE;
|
|
auio.uio_rw = UIO_WRITE;
|
|
aiov[0].iov_base = (caddr_t)kth;
|
|
aiov[0].iov_len = sizeof(struct ktr_header);
|
|
auio.uio_resid = sizeof(struct ktr_header);
|
|
auio.uio_iovcnt = 1;
|
|
auio.uio_procp = (struct proc *)0;
|
|
if (kth->ktr_len > 0) {
|
|
auio.uio_iovcnt++;
|
|
aiov[1].iov_base = kth->ktr_buf;
|
|
aiov[1].iov_len = kth->ktr_len;
|
|
auio.uio_resid += kth->ktr_len;
|
|
}
|
|
if (p->p_traceflag & KTRFAC_FD) {
|
|
struct file *fp = v;
|
|
|
|
FILE_USE(fp);
|
|
error = (*fp->f_ops->fo_write)(fp, &fp->f_offset, &auio,
|
|
fp->f_cred, FOF_UPDATE_OFFSET);
|
|
FILE_UNUSE(fp, NULL);
|
|
}
|
|
else {
|
|
struct vnode *vp = v;
|
|
|
|
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
|
|
error = VOP_WRITE(vp, &auio, IO_UNIT|IO_APPEND, p->p_ucred);
|
|
VOP_UNLOCK(vp, 0);
|
|
}
|
|
if (__predict_true(error == 0))
|
|
return (0);
|
|
/*
|
|
* If error encountered, give up tracing on this vnode. Don't report
|
|
* EPIPE as this can easily happen with fktrace()/ktruss.
|
|
*/
|
|
if (error != EPIPE)
|
|
log(LOG_NOTICE,
|
|
"ktrace write failed, errno %d, tracing stopped\n",
|
|
error);
|
|
proclist_lock_read();
|
|
for (p = LIST_FIRST(&allproc); p != NULL; p = LIST_NEXT(p, p_list)) {
|
|
if (p->p_tracep == v)
|
|
ktrderef(p);
|
|
}
|
|
proclist_unlock_read();
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Return true if caller has permission to set the ktracing state
|
|
* of target. Essentially, the target can't possess any
|
|
* more permissions than the caller. KTRFAC_ROOT signifies that
|
|
* root previously set the tracing status on the target process, and
|
|
* so, only root may further change it.
|
|
*
|
|
* TODO: check groups. use caller effective gid.
|
|
*/
|
|
int
|
|
ktrcanset(callp, targetp)
|
|
struct proc *callp, *targetp;
|
|
{
|
|
struct pcred *caller = callp->p_cred;
|
|
struct pcred *target = targetp->p_cred;
|
|
|
|
if ((caller->pc_ucred->cr_uid == target->p_ruid &&
|
|
target->p_ruid == target->p_svuid &&
|
|
caller->p_rgid == target->p_rgid && /* XXX */
|
|
target->p_rgid == target->p_svgid &&
|
|
(targetp->p_traceflag & KTRFAC_ROOT) == 0) ||
|
|
caller->pc_ucred->cr_uid == 0)
|
|
return (1);
|
|
|
|
return (0);
|
|
}
|
|
|
|
#endif
|