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From: Jaakko Heinonen <jh@FreeBSD.org>
Date: Wed, 13 Jul 2011 06:20:01 +0000 (UTC)
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Subject: svn commit: r223977 - stable/8/sys/kern
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Author: jh
Date: Wed Jul 13 06:20:00 2011
New Revision: 223977
URL: http://svn.freebsd.org/changeset/base/223977

Log:
  MFC r222216:
  
  In init_dynamic_kenv(), ignore environment strings exceeding the
  KENV_MNAMELEN + 1 + KENV_MVALLEN + 1 length limit to avoid buffer
  overflow in getenv(). Currenly loader(8) doesn't limit the length of
  environment strings.
  
  PR:		kern/132104

Modified:
  stable/8/sys/kern/kern_environment.c
Directory Properties:
  stable/8/sys/   (props changed)
  stable/8/sys/amd64/include/xen/   (props changed)
  stable/8/sys/cddl/contrib/opensolaris/   (props changed)
  stable/8/sys/contrib/dev/acpica/   (props changed)
  stable/8/sys/contrib/pf/   (props changed)

Modified: stable/8/sys/kern/kern_environment.c
==============================================================================
--- stable/8/sys/kern/kern_environment.c	Wed Jul 13 05:56:51 2011	(r223976)
+++ stable/8/sys/kern/kern_environment.c	Wed Jul 13 06:20:00 2011	(r223977)
@@ -215,13 +215,19 @@ static void
 init_dynamic_kenv(void *data __unused)
 {
 	char *cp;
-	int len, i;
+	size_t len;
+	int i;
 
 	kenvp = malloc((KENV_SIZE + 1) * sizeof(char *), M_KENV,
 		M_WAITOK | M_ZERO);
 	i = 0;
 	for (cp = kern_envp; cp != NULL; cp = kernenv_next(cp)) {
 		len = strlen(cp) + 1;
+		if (len > KENV_MNAMELEN + 1 + KENV_MVALLEN + 1) {
+			printf("WARNING: too long kenv string, ignoring %s\n",
+			    cp);
+			continue;
+		}
 		if (i < KENV_SIZE) {
 			kenvp[i] = malloc(len, M_KENV, M_WAITOK);
 			strcpy(kenvp[i++], cp);