[src/netbsd-1-4]: src/sys/arch/vax/vax Apply patch (requested by ragge):

[he <he%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/11540ac97610
branches:  netbsd-1-4
changeset: 470076:11540ac97610
user:      he <he%NetBSD.org@localhost>
date:      Mon Jan 17 18:40:28 2000 +0000

description:
Apply patch (requested by ragge):
  Prevent a crash if a bogus sigcontext pointer is passed to
  sigreturn().

diffstat:

 sys/arch/vax/vax/machdep.c |  6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diffs (27 lines):

diff -r 3784497cc0fd -r 11540ac97610 sys/arch/vax/vax/machdep.c
--- a/sys/arch/vax/vax/machdep.c        Mon Jan 17 18:36:04 2000 +0000
+++ b/sys/arch/vax/vax/machdep.c        Mon Jan 17 18:40:28 2000 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: machdep.c,v 1.76.2.2 1999/12/16 22:49:20 he Exp $   */
+/* $NetBSD: machdep.c,v 1.76.2.3 2000/01/17 18:40:28 he Exp $   */
 
 /*
  * Copyright (c) 1994, 1998 Ludd, University of Lule}, Sweden.
@@ -483,6 +483,8 @@
 
        scf = p->p_addr->u_pcb.framep;
        cntx = SCARG(uap, sigcntxp);
+       if (uvm_useracc((caddr_t)cntx, sizeof (*cntx), B_READ) == 0)
+               return EINVAL;
 
        /* Compatibility mode? */
        if ((cntx->sc_ps & (PSL_IPL | PSL_IS)) ||
@@ -521,6 +523,8 @@
 
        scf = p->p_addr->u_pcb.framep;
        cntx = SCARG(uap, sigcntxp);
+       if (uvm_useracc((caddr_t)cntx, sizeof (*cntx), B_READ) == 0)
+               return EINVAL;
 
        /* Compatibility mode? */
        if ((cntx->sc_ps & (PSL_IPL | PSL_IS)) ||