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Add pcb_onfault handling to address exception handler so users can't crash 

the kernel by passing ludicrous addresses to system calls.
This commit is contained in:
bjh21 2003-11-30 13:22:32 +00:00
parent d8ec3cb507
commit a5bcddc85a
1 changed files with 10 additions and 3 deletions
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13
sys/arch/acorn26/acorn26/except.c
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@ -1,4 +1,4 @@
/* $NetBSD: except.c,v 1.6 2003/11/29 22:03:21 bjh21 Exp $ */
/* $NetBSD: except.c,v 1.7 2003/11/30 13:22:32 bjh21 Exp $ */
/*-
* Copyright (c) 1998, 1999, 2000 Ben Harris
* All rights reserved.
@ -31,7 +31,7 @@
#include <sys/param.h>
__KERNEL_RCSID(0, "$NetBSD: except.c,v 1.6 2003/11/29 22:03:21 bjh21 Exp $");
__KERNEL_RCSID(0, "$NetBSD: except.c,v 1.7 2003/11/30 13:22:32 bjh21 Exp $");
#include "opt_ddb.h"
#include "opt_ktrace.h"
@ -444,7 +444,14 @@ address_exception_handler(struct trapframe *tf)
l = &lwp0;
if ((tf->tf_r15 & R15_MODE) == R15_MODE_USR)
l->l_addr->u_pcb.pcb_tf = tf;
if (curpcb->pcb_onfault != NULL) {
tf->tf_r0 = EFAULT;
tf->tf_r15 = (tf->tf_r15 & ~R15_PC) |
(register_t)curpcb->pcb_onfault;
return;
}
pc = tf->tf_r15 & R15_PC;
if ((tf->tf_r15 & R15_MODE) != R15_MODE_USR) {