File openssl-CVE-2016-2108.patch of Package openssl.6981

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File openssl-CVE-2016-2108.patch of Package openssl.6981

From c5e4bc81c5a142cab7f46f69824fa35367999ee8 Mon Sep 17 00:00:00 2001
From: Dr. Stephen Henson <steve@openssl.org>
Date: Fri, 15 Apr 2016 02:37:09 +0100
Subject: [PATCH] Fix ASN1_INTEGER handling.

Only treat an ASN1_ANY type as an integer if it has the V_ASN1_INTEGER
tag: V_ASN1_NEG_INTEGER is an internal only value which is never used
for on the wire encoding.

Thanks to David Benjamin <davidben@google.com> for reporting this bug.

This was found using libFuzzer.

RT#4364 (part)CVE-2016-2108.
---
 crypto/asn1/a_type.c   | 2 --
 crypto/asn1/tasn_dec.c | 2 --
 crypto/asn1/tasn_enc.c | 2 --
 3 files changed, 0 insertions(+), 6 deletions(-)

From 32d3b0f52f77ce86d53f38685336668d47c5bdfe Mon Sep 17 00:00:00 2001
From: "Dr. Stephen Henson" <steve@openssl.org>
Date: Thu, 16 Apr 2015 16:43:09 +0100
Subject: [PATCH] Fix encoding bug in i2c_ASN1_INTEGER
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Fix bug where i2c_ASN1_INTEGER mishandles zero if it is marked as
negative.

Thanks to Huzaifa Sidhpurwala <huzaifas@redhat.com> and
Hanno Böck <hanno@hboeck.de> for reporting this issue.

Reviewed-by: Rich Salz <rsalz@openssl.org>
(cherry picked from commit a0eed48d37a4b7beea0c966caf09ad46f4a92a44)
---
 crypto/asn1/a_int.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

Index: openssl-1.0.1i/crypto/asn1/a_type.c
===================================================================
--- openssl-1.0.1i.orig/crypto/asn1/a_type.c	2016-04-28 15:39:48.512663139 +0200
+++ openssl-1.0.1i/crypto/asn1/a_type.c	2016-04-28 15:42:49.378664932 +0200
@@ -131,9 +131,7 @@ int ASN1_TYPE_cmp(const ASN1_TYPE *a, co
 		result = 0;	/* They do not have content. */
 		break;
 	case V_ASN1_INTEGER:
-	case V_ASN1_NEG_INTEGER:
 	case V_ASN1_ENUMERATED:
-	case V_ASN1_NEG_ENUMERATED:
 	case V_ASN1_BIT_STRING:
 	case V_ASN1_OCTET_STRING:
 	case V_ASN1_SEQUENCE:
Index: openssl-1.0.1i/crypto/asn1/tasn_dec.c
===================================================================
--- openssl-1.0.1i.orig/crypto/asn1/tasn_dec.c	2016-04-28 15:39:48.512663139 +0200
+++ openssl-1.0.1i/crypto/asn1/tasn_dec.c	2016-04-28 15:44:38.059490691 +0200
@@ -1006,9 +1006,7 @@ int asn1_ex_c2i(ASN1_VALUE **pval, const
 		break;
 
 		case V_ASN1_INTEGER:
-		case V_ASN1_NEG_INTEGER:
 		case V_ASN1_ENUMERATED:
-		case V_ASN1_NEG_ENUMERATED:
 		tint = (ASN1_INTEGER **)pval;
 		if (!c2i_ASN1_INTEGER(tint, &cont, len))
 			goto err;
Index: openssl-1.0.1i/crypto/asn1/tasn_enc.c
===================================================================
--- openssl-1.0.1i.orig/crypto/asn1/tasn_enc.c	2016-04-28 15:39:48.512663139 +0200
+++ openssl-1.0.1i/crypto/asn1/tasn_enc.c	2016-04-28 15:45:41.659558469 +0200
@@ -643,9 +643,7 @@ int asn1_ex_i2c(ASN1_VALUE **pval, unsig
 		break;
 
 		case V_ASN1_INTEGER:
-		case V_ASN1_NEG_INTEGER:
 		case V_ASN1_ENUMERATED:
-		case V_ASN1_NEG_ENUMERATED:
 		/* These are all have the same content format
 		 * as ASN1_INTEGER
 		 */
Index: openssl-1.0.1i/crypto/asn1/a_int.c
===================================================================
--- openssl-1.0.1i.orig/crypto/asn1/a_int.c
+++ openssl-1.0.1i/crypto/asn1/a_int.c
@@ -124,6 +124,8 @@ int i2c_ASN1_INTEGER(ASN1_INTEGER *a, un
 		{
 		ret=a->length;
 		i=a->data[0];
+ 		if (ret == 1 && i == 0)
+ 			neg=0;
 		if (!neg && (i > 127)) {
 			pad=1;
 			pb=0;
@@ -157,7 +159,7 @@ int i2c_ASN1_INTEGER(ASN1_INTEGER *a, un
 		p += a->length - 1;
 		i = a->length;
 		/* Copy zeros to destination as long as source is zero */
-		while(!*n) {
+		while(!*n && i > 1) {
 			*(p--) = 0;
 			n--;
 			i--;
@@ -415,7 +417,7 @@ ASN1_INTEGER *BN_to_ASN1_INTEGER(const B
 		ASN1err(ASN1_F_BN_TO_ASN1_INTEGER,ERR_R_NESTED_ASN1_ERROR);
 		goto err;
 		}
-	if (BN_is_negative(bn))
+	if (BN_is_negative(bn) && !BN_is_zero(bn))
 		ret->type = V_ASN1_NEG_INTEGER;
 	else ret->type=V_ASN1_INTEGER;
 	j=BN_num_bits(bn);

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