[src/trunk]: src/sys/kern Add a comment describing why we give carte blanche ...

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

details:   https://anonhg.NetBSD.org/src/rev/9e3ab1278321
branches:  trunk
changeset: 1024819:9e3ab1278321
user:      thorpej <thorpej%NetBSD.org@localhost>
date:      Sun Nov 07 01:51:56 2021 +0000

description:
Add a comment describing why we give carte blanche to processes
marked as PK_32.  NFC.

diffstat:

 sys/kern/sys_sig.c |  8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diffs (29 lines):

diff -r 4a5d505c7734 -r 9e3ab1278321 sys/kern/sys_sig.c
--- a/sys/kern/sys_sig.c        Sat Nov 06 23:29:03 2021 +0000
+++ b/sys/kern/sys_sig.c        Sun Nov 07 01:51:56 2021 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: sys_sig.c,v 1.54 2021/11/01 05:07:17 thorpej Exp $     */
+/*     $NetBSD: sys_sig.c,v 1.55 2021/11/07 01:51:56 thorpej Exp $     */
 
 /*-
  * Copyright (c) 2006, 2007, 2008 The NetBSD Foundation, Inc.
@@ -66,7 +66,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: sys_sig.c,v 1.54 2021/11/01 05:07:17 thorpej Exp $");
+__KERNEL_RCSID(0, "$NetBSD: sys_sig.c,v 1.55 2021/11/07 01:51:56 thorpej Exp $");
 
 #include "opt_dtrace.h"
 
@@ -419,6 +419,10 @@
                        }
 #ifdef __HAVE_STRUCT_SIGCONTEXT
                        else if (p->p_flag & PK_32) {
+                               /*
+                                * The 32-bit compat module will have
+                                * pre-validated this for us.
+                                */
                                v0v1valid = true;
                        } else if ((p->p_lflag & PL_SIGCOMPAT) == 0) {
                                kernconfig_lock();