46aa3347cb
because it only takes a struct tag which makes it impossible to use unions, typedefs etc. Define __offsetof() in <machine/ansi.h> Define offsetof() in terms of __offsetof() in <stddef.h> and <sys/types.h> Remove myriad of local offsetof() definitions. Remove includes of <stddef.h> in kernel code. NB: Kernelcode should *never* include from /usr/include ! Make <sys/queue.h> include <machine/ansi.h> to avoid polluting the API. Deprecate <struct.h> with a warning. The warning turns into an error on 01-12-2000 and the file gets removed entirely on 01-01-2001. Paritials reviews by: various. Significant brucifications by: bde
538 lines
12 KiB
C
538 lines
12 KiB
C
/*
|
|
* Copyright (c) 1989, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* @(#)kern_ktrace.c 8.2 (Berkeley) 9/23/93
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#include "opt_ktrace.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/sysproto.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/fcntl.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/namei.h>
|
|
#include <sys/vnode.h>
|
|
#include <sys/ktrace.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/syslog.h>
|
|
|
|
static MALLOC_DEFINE(M_KTRACE, "KTRACE", "KTRACE");
|
|
|
|
#ifdef KTRACE
|
|
static struct ktr_header *ktrgetheader __P((int type));
|
|
static void ktrwrite __P((struct vnode *, struct ktr_header *, struct uio *));
|
|
static int ktrcanset __P((struct proc *,struct proc *));
|
|
static int ktrsetchildren __P((struct proc *,struct proc *,int,int,struct vnode *));
|
|
static int ktrops __P((struct proc *,struct proc *,int,int,struct vnode *));
|
|
|
|
|
|
static struct ktr_header *
|
|
ktrgetheader(type)
|
|
int type;
|
|
{
|
|
register struct ktr_header *kth;
|
|
struct proc *p = curproc; /* XXX */
|
|
|
|
MALLOC(kth, struct ktr_header *, sizeof (struct ktr_header),
|
|
M_KTRACE, M_WAITOK);
|
|
kth->ktr_type = type;
|
|
microtime(&kth->ktr_time);
|
|
kth->ktr_pid = p->p_pid;
|
|
bcopy(p->p_comm, kth->ktr_comm, MAXCOMLEN + 1);
|
|
return (kth);
|
|
}
|
|
|
|
void
|
|
ktrsyscall(vp, code, narg, args)
|
|
struct vnode *vp;
|
|
int code, narg;
|
|
register_t args[];
|
|
{
|
|
struct ktr_header *kth;
|
|
struct ktr_syscall *ktp;
|
|
register int len = offsetof(struct ktr_syscall, ktr_args) +
|
|
(narg * sizeof(register_t));
|
|
struct proc *p = curproc; /* XXX */
|
|
register_t *argp;
|
|
int i;
|
|
|
|
p->p_traceflag |= KTRFAC_ACTIVE;
|
|
kth = ktrgetheader(KTR_SYSCALL);
|
|
MALLOC(ktp, struct ktr_syscall *, len, M_KTRACE, M_WAITOK);
|
|
ktp->ktr_code = code;
|
|
ktp->ktr_narg = narg;
|
|
argp = &ktp->ktr_args[0];
|
|
for (i = 0; i < narg; i++)
|
|
*argp++ = args[i];
|
|
kth->ktr_buffer = (caddr_t)ktp;
|
|
kth->ktr_len = len;
|
|
ktrwrite(vp, kth, NULL);
|
|
FREE(ktp, M_KTRACE);
|
|
FREE(kth, M_KTRACE);
|
|
p->p_traceflag &= ~KTRFAC_ACTIVE;
|
|
}
|
|
|
|
void
|
|
ktrsysret(vp, code, error, retval)
|
|
struct vnode *vp;
|
|
int code, error;
|
|
register_t retval;
|
|
{
|
|
struct ktr_header *kth;
|
|
struct ktr_sysret ktp;
|
|
struct proc *p = curproc; /* XXX */
|
|
|
|
p->p_traceflag |= KTRFAC_ACTIVE;
|
|
kth = ktrgetheader(KTR_SYSRET);
|
|
ktp.ktr_code = code;
|
|
ktp.ktr_error = error;
|
|
ktp.ktr_retval = retval; /* what about val2 ? */
|
|
|
|
kth->ktr_buffer = (caddr_t)&ktp;
|
|
kth->ktr_len = sizeof(struct ktr_sysret);
|
|
|
|
ktrwrite(vp, kth, NULL);
|
|
FREE(kth, M_KTRACE);
|
|
p->p_traceflag &= ~KTRFAC_ACTIVE;
|
|
}
|
|
|
|
void
|
|
ktrnamei(vp, path)
|
|
struct vnode *vp;
|
|
char *path;
|
|
{
|
|
struct ktr_header *kth;
|
|
struct proc *p = curproc; /* XXX */
|
|
|
|
p->p_traceflag |= KTRFAC_ACTIVE;
|
|
kth = ktrgetheader(KTR_NAMEI);
|
|
kth->ktr_len = strlen(path);
|
|
kth->ktr_buffer = path;
|
|
|
|
ktrwrite(vp, kth, NULL);
|
|
FREE(kth, M_KTRACE);
|
|
p->p_traceflag &= ~KTRFAC_ACTIVE;
|
|
}
|
|
|
|
void
|
|
ktrgenio(vp, fd, rw, uio, error)
|
|
struct vnode *vp;
|
|
int fd;
|
|
enum uio_rw rw;
|
|
struct uio *uio;
|
|
int error;
|
|
{
|
|
struct ktr_header *kth;
|
|
struct ktr_genio ktg;
|
|
struct proc *p = curproc; /* XXX */
|
|
|
|
if (error)
|
|
return;
|
|
p->p_traceflag |= KTRFAC_ACTIVE;
|
|
kth = ktrgetheader(KTR_GENIO);
|
|
ktg.ktr_fd = fd;
|
|
ktg.ktr_rw = rw;
|
|
kth->ktr_buffer = (caddr_t)&ktg;
|
|
kth->ktr_len = sizeof(struct ktr_genio);
|
|
uio->uio_offset = 0;
|
|
uio->uio_rw = UIO_WRITE;
|
|
|
|
ktrwrite(vp, kth, uio);
|
|
FREE(kth, M_KTRACE);
|
|
p->p_traceflag &= ~KTRFAC_ACTIVE;
|
|
}
|
|
|
|
void
|
|
ktrpsig(vp, sig, action, mask, code)
|
|
struct vnode *vp;
|
|
int sig;
|
|
sig_t action;
|
|
sigset_t *mask;
|
|
int code;
|
|
{
|
|
struct ktr_header *kth;
|
|
struct ktr_psig kp;
|
|
struct proc *p = curproc; /* XXX */
|
|
|
|
p->p_traceflag |= KTRFAC_ACTIVE;
|
|
kth = ktrgetheader(KTR_PSIG);
|
|
kp.signo = (char)sig;
|
|
kp.action = action;
|
|
kp.mask = *mask;
|
|
kp.code = code;
|
|
kth->ktr_buffer = (caddr_t)&kp;
|
|
kth->ktr_len = sizeof (struct ktr_psig);
|
|
|
|
ktrwrite(vp, kth, NULL);
|
|
FREE(kth, M_KTRACE);
|
|
p->p_traceflag &= ~KTRFAC_ACTIVE;
|
|
}
|
|
|
|
void
|
|
ktrcsw(vp, out, user)
|
|
struct vnode *vp;
|
|
int out, user;
|
|
{
|
|
struct ktr_header *kth;
|
|
struct ktr_csw kc;
|
|
struct proc *p = curproc; /* XXX */
|
|
|
|
p->p_traceflag |= KTRFAC_ACTIVE;
|
|
kth = ktrgetheader(KTR_CSW);
|
|
kc.out = out;
|
|
kc.user = user;
|
|
kth->ktr_buffer = (caddr_t)&kc;
|
|
kth->ktr_len = sizeof (struct ktr_csw);
|
|
|
|
ktrwrite(vp, kth, NULL);
|
|
FREE(kth, M_KTRACE);
|
|
p->p_traceflag &= ~KTRFAC_ACTIVE;
|
|
}
|
|
#endif
|
|
|
|
/* Interface and common routines */
|
|
|
|
/*
|
|
* ktrace system call
|
|
*/
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct ktrace_args {
|
|
char *fname;
|
|
int ops;
|
|
int facs;
|
|
int pid;
|
|
};
|
|
#endif
|
|
/* ARGSUSED */
|
|
int
|
|
ktrace(curp, uap)
|
|
struct proc *curp;
|
|
register struct ktrace_args *uap;
|
|
{
|
|
#ifdef KTRACE
|
|
register struct vnode *vp = NULL;
|
|
register struct proc *p;
|
|
struct pgrp *pg;
|
|
int facs = uap->facs & ~KTRFAC_ROOT;
|
|
int ops = KTROP(uap->ops);
|
|
int descend = uap->ops & KTRFLAG_DESCEND;
|
|
int ret = 0;
|
|
int flags, error = 0;
|
|
struct nameidata nd;
|
|
|
|
curp->p_traceflag |= KTRFAC_ACTIVE;
|
|
if (ops != KTROP_CLEAR) {
|
|
/*
|
|
* an operation which requires a file argument.
|
|
*/
|
|
NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, uap->fname, curp);
|
|
flags = FREAD | FWRITE | O_NOFOLLOW;
|
|
error = vn_open(&nd, &flags, 0);
|
|
if (error) {
|
|
curp->p_traceflag &= ~KTRFAC_ACTIVE;
|
|
return (error);
|
|
}
|
|
NDFREE(&nd, NDF_ONLY_PNBUF);
|
|
vp = nd.ni_vp;
|
|
VOP_UNLOCK(vp, 0, curp);
|
|
if (vp->v_type != VREG) {
|
|
(void) vn_close(vp, FREAD|FWRITE, curp->p_ucred, curp);
|
|
curp->p_traceflag &= ~KTRFAC_ACTIVE;
|
|
return (EACCES);
|
|
}
|
|
}
|
|
/*
|
|
* Clear all uses of the tracefile
|
|
*/
|
|
if (ops == KTROP_CLEARFILE) {
|
|
LIST_FOREACH(p, &allproc, p_list) {
|
|
if (p->p_tracep == vp) {
|
|
if (ktrcanset(curp, p)) {
|
|
p->p_tracep = NULL;
|
|
p->p_traceflag = 0;
|
|
(void) vn_close(vp, FREAD|FWRITE,
|
|
p->p_ucred, p);
|
|
} else
|
|
error = EPERM;
|
|
}
|
|
}
|
|
goto done;
|
|
}
|
|
/*
|
|
* need something to (un)trace (XXX - why is this here?)
|
|
*/
|
|
if (!facs) {
|
|
error = EINVAL;
|
|
goto done;
|
|
}
|
|
/*
|
|
* do it
|
|
*/
|
|
if (uap->pid < 0) {
|
|
/*
|
|
* by process group
|
|
*/
|
|
pg = pgfind(-uap->pid);
|
|
if (pg == NULL) {
|
|
error = ESRCH;
|
|
goto done;
|
|
}
|
|
LIST_FOREACH(p, &pg->pg_members, p_pglist)
|
|
if (descend)
|
|
ret |= ktrsetchildren(curp, p, ops, facs, vp);
|
|
else
|
|
ret |= ktrops(curp, p, ops, facs, vp);
|
|
|
|
} else {
|
|
/*
|
|
* by pid
|
|
*/
|
|
p = pfind(uap->pid);
|
|
if (p == NULL) {
|
|
error = ESRCH;
|
|
goto done;
|
|
}
|
|
if (descend)
|
|
ret |= ktrsetchildren(curp, p, ops, facs, vp);
|
|
else
|
|
ret |= ktrops(curp, p, ops, facs, vp);
|
|
}
|
|
if (!ret)
|
|
error = EPERM;
|
|
done:
|
|
if (vp != NULL)
|
|
(void) vn_close(vp, FWRITE, curp->p_ucred, curp);
|
|
curp->p_traceflag &= ~KTRFAC_ACTIVE;
|
|
return (error);
|
|
#else
|
|
return ENOSYS;
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* utrace system call
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
utrace(curp, uap)
|
|
struct proc *curp;
|
|
register struct utrace_args *uap;
|
|
{
|
|
#ifdef KTRACE
|
|
struct ktr_header *kth;
|
|
struct proc *p = curproc; /* XXX */
|
|
register caddr_t cp;
|
|
|
|
if (!KTRPOINT(p, KTR_USER))
|
|
return (0);
|
|
p->p_traceflag |= KTRFAC_ACTIVE;
|
|
kth = ktrgetheader(KTR_USER);
|
|
MALLOC(cp, caddr_t, uap->len, M_KTRACE, M_WAITOK);
|
|
if (!copyin(uap->addr, cp, uap->len)) {
|
|
kth->ktr_buffer = cp;
|
|
kth->ktr_len = uap->len;
|
|
ktrwrite(p->p_tracep, kth, NULL);
|
|
}
|
|
FREE(kth, M_KTRACE);
|
|
FREE(cp, M_KTRACE);
|
|
p->p_traceflag &= ~KTRFAC_ACTIVE;
|
|
|
|
return (0);
|
|
#else
|
|
return (ENOSYS);
|
|
#endif
|
|
}
|
|
|
|
#ifdef KTRACE
|
|
static int
|
|
ktrops(curp, p, ops, facs, vp)
|
|
struct proc *p, *curp;
|
|
int ops, facs;
|
|
struct vnode *vp;
|
|
{
|
|
|
|
if (!ktrcanset(curp, p))
|
|
return (0);
|
|
if (ops == KTROP_SET) {
|
|
if (p->p_tracep != vp) {
|
|
/*
|
|
* if trace file already in use, relinquish
|
|
*/
|
|
if (p->p_tracep != NULL)
|
|
vrele(p->p_tracep);
|
|
VREF(vp);
|
|
p->p_tracep = vp;
|
|
}
|
|
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 */
|
|
p->p_traceflag = 0;
|
|
if (p->p_tracep != NULL) {
|
|
vrele(p->p_tracep);
|
|
p->p_tracep = NULL;
|
|
}
|
|
}
|
|
}
|
|
|
|
return (1);
|
|
}
|
|
|
|
static int
|
|
ktrsetchildren(curp, top, ops, facs, vp)
|
|
struct proc *curp, *top;
|
|
int ops, facs;
|
|
struct vnode *vp;
|
|
{
|
|
register struct proc *p;
|
|
register int ret = 0;
|
|
|
|
p = top;
|
|
for (;;) {
|
|
ret |= ktrops(curp, p, ops, facs, vp);
|
|
/*
|
|
* If this process has children, descend to them next,
|
|
* otherwise do any siblings, and if done with this level,
|
|
* follow back up the tree (but not past top).
|
|
*/
|
|
if (!LIST_EMPTY(&p->p_children))
|
|
p = LIST_FIRST(&p->p_children);
|
|
else for (;;) {
|
|
if (p == top)
|
|
return (ret);
|
|
if (LIST_NEXT(p, p_sibling)) {
|
|
p = LIST_NEXT(p, p_sibling);
|
|
break;
|
|
}
|
|
p = p->p_pptr;
|
|
}
|
|
}
|
|
/*NOTREACHED*/
|
|
}
|
|
|
|
static void
|
|
ktrwrite(vp, kth, uio)
|
|
struct vnode *vp;
|
|
register struct ktr_header *kth;
|
|
struct uio *uio;
|
|
{
|
|
struct uio auio;
|
|
struct iovec aiov[2];
|
|
struct proc *p = curproc; /* XXX */
|
|
struct mount *mp;
|
|
int error;
|
|
|
|
if (vp == 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 = curproc;
|
|
if (kth->ktr_len > 0) {
|
|
auio.uio_iovcnt++;
|
|
aiov[1].iov_base = kth->ktr_buffer;
|
|
aiov[1].iov_len = kth->ktr_len;
|
|
auio.uio_resid += kth->ktr_len;
|
|
if (uio != NULL)
|
|
kth->ktr_len += uio->uio_resid;
|
|
}
|
|
vn_start_write(vp, &mp, V_WAIT);
|
|
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
|
|
(void)VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
|
|
error = VOP_WRITE(vp, &auio, IO_UNIT | IO_APPEND, p->p_ucred);
|
|
if (error == 0 && uio != NULL) {
|
|
(void)VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
|
|
error = VOP_WRITE(vp, uio, IO_UNIT | IO_APPEND, p->p_ucred);
|
|
}
|
|
VOP_UNLOCK(vp, 0, p);
|
|
vn_finished_write(mp);
|
|
if (!error)
|
|
return;
|
|
/*
|
|
* If error encountered, give up tracing on this vnode.
|
|
*/
|
|
log(LOG_NOTICE, "ktrace write failed, errno %d, tracing stopped\n",
|
|
error);
|
|
LIST_FOREACH(p, &allproc, p_list) {
|
|
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.
|
|
*
|
|
* XXX: These checks are stronger than for ptrace()
|
|
*
|
|
* 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 */
|