e3669c3393
count is 0, wait for use count to drain before finishing the close. This is necessary in order for multiple processes to safely share file descriptor tables.
654 lines
14 KiB
C
654 lines
14 KiB
C
/* $NetBSD: kern_ktrace.c,v 1.35 1999/05/05 20:01:08 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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struct ktr_header *ktrgetheader __P((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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void 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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struct ktr_header *
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ktrgetheader(type)
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int type;
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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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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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memcpy(kth->ktr_comm, p->p_comm, MAXCOMLEN);
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/* Note: ktr_len and ktr_buf are left to be filled in by the caller. */
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return (kth);
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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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int 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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kth = ktrgetheader(KTR_SYSCALL);
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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_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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ktrwrite(p, v, kth);
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FREE(ktp, M_TEMP);
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FREE(kth, 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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kth = ktrgetheader(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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ktrwrite(p, v, kth);
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FREE(kth, M_TEMP);
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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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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(p, v, kth);
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FREE(kth, M_TEMP);
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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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kth = ktrgetheader(KTR_EMUL);
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kth->ktr_len = strlen(emul);
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kth->ktr_buf = emul;
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ktrwrite(p, v, kth);
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FREE(kth, M_TEMP);
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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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if (error)
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return;
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p->p_traceflag |= KTRFAC_ACTIVE;
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kth = ktrgetheader(KTR_GENIO);
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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(p, v, 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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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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kth = ktrgetheader(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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ktrwrite(p, v, kth);
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FREE(kth, M_TEMP);
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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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kth = ktrgetheader(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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ktrwrite(p, v, kth);
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FREE(kth, M_TEMP);
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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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for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) {
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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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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 = pg->pg_members.lh_first; p != 0; p = p->p_pglist.le_next)
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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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} 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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for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) {
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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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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 = pg->pg_members.lh_first; p != 0; p = p->p_pglist.le_next)
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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(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
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*/
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ktrderef(p);
|
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if (ops & KTRFLAG_FD)
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p->p_traceflag = KTRFAC_FD;
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p->p_tracep = v;
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ktradref(p);
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}
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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 (p->p_children.lh_first)
|
|
p = p->p_children.lh_first;
|
|
else for (;;) {
|
|
if (p == top)
|
|
return (ret);
|
|
if (p->p_sibling.le_next) {
|
|
p = p->p_sibling.le_next;
|
|
break;
|
|
}
|
|
p = p->p_pptr;
|
|
}
|
|
}
|
|
/*NOTREACHED*/
|
|
}
|
|
|
|
void
|
|
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;
|
|
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 (!error)
|
|
return;
|
|
/*
|
|
* If error encountered, give up tracing on this vnode.
|
|
*/
|
|
log(LOG_NOTICE, "ktrace write failed, errno %d, tracing stopped\n",
|
|
error);
|
|
for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) {
|
|
if (p->p_tracep == v)
|
|
ktrderef(p);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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
|