7d9ace1d46
now use a pool mutex to manage the reference counts. This fixes races resulting in use-after-free. Tested by: kris, David Cornejo dave at dogwood dot com Reported by: bmilekic's MemGuard MFC after: 1 week
131 lines
3.6 KiB
C
131 lines
3.6 KiB
C
/*-
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* Copyright (c) 2001 Jake Burkholder.
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* 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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/sysproto.h>
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#include <machine/md_var.h>
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#include <machine/utrap.h>
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#include <machine/sysarch.h>
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static int sparc_sigtramp_install(struct thread *td, char *args);
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static int sparc_utrap_install(struct thread *td, char *args);
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#ifndef _SYS_SYSPROTO_H_
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struct sysarch_args {
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int op;
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char *parms;
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};
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#endif
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int
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sysarch(struct thread *td, struct sysarch_args *uap)
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{
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int error;
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mtx_lock(&Giant);
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switch (uap->op) {
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case SPARC_SIGTRAMP_INSTALL:
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error = sparc_sigtramp_install(td, uap->parms);
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break;
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case SPARC_UTRAP_INSTALL:
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error = sparc_utrap_install(td, uap->parms);
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break;
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default:
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error = EINVAL;
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break;
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}
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mtx_unlock(&Giant);
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return (error);
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}
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static int
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sparc_sigtramp_install(struct thread *td, char *args)
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{
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struct sparc_sigtramp_install_args sia;
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struct proc *p;
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int error;
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p = td->td_proc;
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if ((error = copyin(args, &sia, sizeof(sia))) != 0)
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return (error);
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if (sia.sia_old != NULL) {
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if (suword(sia.sia_old, (long)p->p_md.md_sigtramp) != 0)
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return (EFAULT);
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}
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p->p_md.md_sigtramp = sia.sia_new;
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return (0);
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}
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static int
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sparc_utrap_install(struct thread *td, char *args)
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{
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struct sparc_utrap_install_args uia;
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struct sparc_utrap_args ua;
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struct md_utrap *ut;
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int error;
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int i;
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ut = td->td_proc->p_md.md_utrap;
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if ((error = copyin(args, &uia, sizeof(uia))) != 0)
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return (error);
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if (uia.num < 0 || uia.num > UT_MAX ||
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(uia.handlers == NULL && uia.num > 0))
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return (EINVAL);
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for (i = 0; i < uia.num; i++) {
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if ((error = copyin(&uia.handlers[i], &ua, sizeof(ua))) != 0)
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return (error);
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if (ua.type != UTH_NOCHANGE &&
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(ua.type < 0 || ua.type >= UT_MAX))
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return (EINVAL);
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if (ua.old_deferred != NULL) {
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if ((error = suword(ua.old_deferred, 0)) != 0)
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return (error);
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}
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if (ua.old_precise != NULL) {
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error = suword(ua.old_precise,
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ut != NULL ? (long)ut->ut_precise[ua.type] : 0);
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if (error != 0)
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return (error);
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}
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if (ua.type != UTH_NOCHANGE) {
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if (ut == NULL) {
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ut = utrap_alloc();
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td->td_proc->p_md.md_utrap = ut;
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}
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ut->ut_precise[ua.type] = ua.new_precise;
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}
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}
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return (0);
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}
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