[src/netbsd-7]: src/usr.bin/find Pull up the following revisions(s) (requeste...

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

details:   https://anonhg.NetBSD.org/src/rev/a0d64aa9183d
branches:  netbsd-7
changeset: 800551:a0d64aa9183d
user:      sborrill <sborrill%NetBSD.org@localhost>
date:      Tue Oct 30 10:07:08 2018 +0000

description:
Pull up the following revisions(s) (requested by mrg in ticket #1642):
        usr.bin/find/function.c:        revision 1.77

When calculating the length of the args that can be
appended in a "find .... -exec something {} +"
usage, remember to allow for the arg pointers, which
form part of what is allowed in ARG_MAX.

diffstat:

 usr.bin/find/function.c |  12 ++++++++----
 1 files changed, 8 insertions(+), 4 deletions(-)

diffs (40 lines):

diff -r 2cbb5b858c52 -r a0d64aa9183d usr.bin/find/function.c
--- a/usr.bin/find/function.c   Tue Oct 30 09:57:05 2018 +0000
+++ b/usr.bin/find/function.c   Tue Oct 30 10:07:08 2018 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: function.c,v 1.72 2013/05/04 06:29:32 uebayasi Exp $   */
+/*     $NetBSD: function.c,v 1.72.6.1 2018/10/30 10:07:08 sborrill Exp $       */
 
 /*-
  * Copyright (c) 1990, 1993
@@ -37,7 +37,7 @@
 #if 0
 static char sccsid[] = "from: @(#)function.c   8.10 (Berkeley) 5/4/95";
 #else
-__RCSID("$NetBSD: function.c,v 1.72 2013/05/04 06:29:32 uebayasi Exp $");
+__RCSID("$NetBSD: function.c,v 1.72.6.1 2018/10/30 10:07:08 sborrill Exp $");
 #endif
 #endif /* not lint */
 
@@ -669,7 +669,9 @@
                size_t c, bufsize;
 
                cnt = ap - *argvp - 1;                  /* units are words */
-               new->ep_maxargs = 5000;
+               new->ep_maxargs = ARG_MAX / (sizeof (char *) + 16);
+               if (new->ep_maxargs > 5000)
+                       new->ep_maxargs = 5000;
                new->e_argv = emalloc((cnt + new->ep_maxargs)
                    * sizeof(*new->e_argv));
 
@@ -690,7 +692,9 @@
                                errx(1, "Arguments too long");
                        new->e_argv[cnt] = *argv;
                }
-               bufsize = MAXARG - c;
+               if (c + new->ep_maxargs * sizeof (char *) >= MAXARG)
+                       errx(1, "Arguments too long");
+               bufsize = MAXARG - c - new->ep_maxargs * sizeof (char *);
 
                /*
                 * Allocate, and then initialize current, base, and