517 lines
12 KiB
C
517 lines
12 KiB
C
/* $NetBSD: kern_ktrace.c,v 1.24 1997/10/19 02:00:28 mycroft 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 8.2 (Berkeley) 9/23/93
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*/
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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/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, struct vnode *));
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int ktrsetchildren __P((struct proc *, struct proc *, int, int,
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struct vnode *));
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void ktrwrite __P((struct vnode *, struct ktr_header *));
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int ktrcanset __P((struct proc *, struct proc *));
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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, argsize, args)
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struct vnode *vp;
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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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register len = sizeof(struct ktr_syscall) + argsize;
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struct proc *p = curproc; /* XXX */
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register_t *argp;
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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(vp, 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(vp, code, error, retval)
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struct vnode *vp;
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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_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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p->p_traceflag &= ~KTRFAC_ACTIVE;
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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;
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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(vp, 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(vp, emul)
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struct vnode *vp;
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char *emul;
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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_EMUL);
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kth->ktr_len = strlen(emul);
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kth->ktr_buf = emul;
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ktrwrite(vp, 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(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;
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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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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(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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p->p_traceflag &= ~KTRFAC_ACTIVE;
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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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int sig;
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sig_t action;
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int mask, 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(vp, 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(vp, out, user)
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struct vnode *vp;
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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(vp, 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_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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register 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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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 = 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);
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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 (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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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 (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, vp)
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struct proc *p, *curp;
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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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/*
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* Emit an emulation record, every time there is a ktrace
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* change/attach request.
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*/
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if (KTRPOINT(p, KTR_EMUL))
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ktremul(p->p_tracep, p->p_emul->e_name);
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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_children.lh_first)
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p = p->p_children.lh_first;
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else for (;;) {
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if (p == top)
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return (ret);
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if (p->p_sibling.le_next) {
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p = p->p_sibling.le_next;
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break;
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}
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p = p->p_pptr;
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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 = allproc.lh_first; p != 0; p = p->p_list.le_next) {
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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 */
|
|
target->p_rgid == target->p_svgid &&
|
|
(targetp->p_traceflag & KTRFAC_ROOT) == 0) ||
|
|
caller->pc_ucred->cr_uid == 0)
|
|
return (1);
|
|
|
|
return (0);
|
|
}
|
|
|
|
#endif
|