2c42a14602
----------------------------- The core of the signalling code has been rewritten to operate on the new sigset_t. No methodological changes have been made. Most references to a sigset_t object are through macros (see signalvar.h) to create a level of abstraction and to provide a basis for further improvements. The NSIG constant has not been changed to reflect the maximum number of signals possible. The reason is that it breaks programs (especially shells) which assume that all signals have a non-null name in sys_signame. See src/bin/sh/trap.c for an example. Instead _SIG_MAXSIG has been introduced to hold the maximum signal possible with the new sigset_t. struct sigprop has been moved from signalvar.h to kern_sig.c because a) it is only used there, and b) access must be done though function sigprop(). The latter because the table doesn't holds properties for all signals, but only for the first NSIG signals. signal.h has been reorganized to make reading easier and to add the new and/or modified structures. The "old" structures are moved to signalvar.h to prevent namespace polution. Especially the coda filesystem suffers from the change, because it contained lines like (p->p_sigmask == SIGIO), which is easy to do for integral types, but not for compound types. NOTE: kdump (and port linux_kdump) must be recompiled. Thanks to Garrett Wollman and Daniel Eischen for pressing the importance of changing sigreturn as well.
538 lines
12 KiB
C
538 lines
12 KiB
C
/*
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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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* $FreeBSD$
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*/
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#include "opt_ktrace.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/sysproto.h>
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#include <sys/kernel.h>
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#include <sys/proc.h>
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#include <sys/fcntl.h>
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#include <sys/lock.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 <stddef.h>
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static MALLOC_DEFINE(M_KTRACE, "KTRACE", "KTRACE");
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#ifdef KTRACE
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static struct ktr_header *ktrgetheader __P((int type));
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static void ktrwrite __P((struct vnode *, struct ktr_header *));
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static int ktrcanset __P((struct proc *,struct proc *));
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static int ktrsetchildren __P((struct proc *,struct proc *,int,int,struct vnode *));
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static int ktrops __P((struct proc *,struct proc *,int,int,struct vnode *));
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static 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_KTRACE, 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 + 1);
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return (kth);
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}
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void
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ktrsyscall(vp, code, narg, args)
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struct vnode *vp;
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int code, narg;
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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 int len = offsetof(struct ktr_syscall, ktr_args) +
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(narg * sizeof(register_t));
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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_KTRACE, M_WAITOK);
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ktp->ktr_code = code;
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ktp->ktr_narg = narg;
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argp = &ktp->ktr_args[0];
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for (i = 0; i < narg; i++)
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*argp++ = args[i];
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kth->ktr_buf = (caddr_t)ktp;
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kth->ktr_len = len;
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ktrwrite(vp, kth);
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FREE(ktp, M_KTRACE);
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FREE(kth, M_KTRACE);
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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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int code, 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_KTRACE);
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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_KTRACE);
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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_KTRACE, 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_KTRACE);
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FREE(ktp, M_KTRACE);
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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, code;
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sig_t action;
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sigset_t *mask;
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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_KTRACE);
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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_KTRACE);
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p->p_traceflag &= ~KTRFAC_ACTIVE;
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}
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#endif
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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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#ifndef _SYS_SYSPROTO_H_
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struct ktrace_args {
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char *fname;
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int ops;
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int facs;
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int pid;
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};
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#endif
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/* ARGSUSED */
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int
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ktrace(curp, uap)
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struct proc *curp;
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register struct ktrace_args *uap;
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{
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#ifdef KTRACE
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register struct vnode *vp = NULL;
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register struct proc *p;
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struct pgrp *pg;
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int facs = uap->facs & ~KTRFAC_ROOT;
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int ops = KTROP(uap->ops);
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int descend = uap->ops & KTRFLAG_DESCEND;
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int ret = 0;
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int error = 0;
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struct nameidata nd;
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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, NOFOLLOW, UIO_USERSPACE, uap->fname, curp);
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error = vn_open(&nd, FREAD|FWRITE|O_NOFOLLOW, 0);
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if (error) {
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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, curp);
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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 (uap->pid < 0) {
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/*
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* by process group
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*/
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pg = pgfind(-uap->pid);
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if (pg == NULL) {
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error = ESRCH;
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goto done;
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}
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for (p = pg->pg_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(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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#else
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return ENOSYS;
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#endif
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}
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/*
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* utrace system call
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*/
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/* ARGSUSED */
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int
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utrace(curp, uap)
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struct proc *curp;
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register struct utrace_args *uap;
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{
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#ifdef KTRACE
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struct ktr_header *kth;
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struct proc *p = curproc; /* XXX */
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register caddr_t cp;
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if (!KTRPOINT(p, KTR_USER))
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return (0);
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p->p_traceflag |= KTRFAC_ACTIVE;
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kth = ktrgetheader(KTR_USER);
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MALLOC(cp, caddr_t, uap->len, M_KTRACE, M_WAITOK);
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if (!copyin(uap->addr, cp, uap->len)) {
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kth->ktr_buf = cp;
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kth->ktr_len = uap->len;
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ktrwrite(p->p_tracep, kth);
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}
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FREE(kth, M_KTRACE);
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FREE(cp, M_KTRACE);
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p->p_traceflag &= ~KTRFAC_ACTIVE;
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return (0);
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#else
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return (ENOSYS);
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#endif
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}
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#ifdef KTRACE
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static 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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return (1);
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}
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static 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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static 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 = curproc;
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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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vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
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error = VOP_WRITE(vp, &auio, IO_UNIT|IO_APPEND, p->p_ucred);
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VOP_UNLOCK(vp, 0, p);
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|
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 == vp) {
|
|
p->p_tracep = NULL;
|
|
p->p_traceflag = 0;
|
|
vrele(vp);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
static int
|
|
ktrcanset(callp, targetp)
|
|
struct proc *callp, *targetp;
|
|
{
|
|
register struct pcred *caller = callp->p_cred;
|
|
register struct pcred *target = targetp->p_cred;
|
|
|
|
if (!PRISON_CHECK(callp, targetp))
|
|
return (0);
|
|
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 /* KTRACE */
|