diff options
Diffstat (limited to 'textproc/libxml2/patches/patch-CVE-2012-0841-aa')
| -rw-r--r-- | textproc/libxml2/patches/patch-CVE-2012-0841-aa | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/textproc/libxml2/patches/patch-CVE-2012-0841-aa b/textproc/libxml2/patches/patch-CVE-2012-0841-aa new file mode 100644 index 00000000000..ec77331faac --- /dev/null +++ b/textproc/libxml2/patches/patch-CVE-2012-0841-aa @@ -0,0 +1,176 @@ +$NetBSD: patch-CVE-2012-0841-aa,v 1.1 2012/03/09 12:12:28 drochner Exp $ + +patch 8973d58b7498fa5100a876815476b81fd1a2412a + +--- dict.c.orig 2010-10-12 06:25:31.000000000 +0000 ++++ dict.c +@@ -2,7 +2,7 @@ + * dict.c: dictionary of reusable strings, just used to avoid allocation + * and freeing operations. + * +- * Copyright (C) 2003 Daniel Veillard. ++ * Copyright (C) 2003-2012 Daniel Veillard. + * + * Permission to use, copy, modify, and distribute this software for any + * purpose with or without fee is hereby granted, provided that the above +@@ -19,6 +19,28 @@ + #define IN_LIBXML + #include "libxml.h" + ++#ifdef HAVE_STDLIB_H ++#include <stdlib.h> ++#endif ++#ifdef HAVE_TIME_H ++#include <time.h> ++#endif ++ ++/* ++ * Following http://www.ocert.org/advisories/ocert-2011-003.html ++ * it seems that having hash randomization might be a good idea ++ * when using XML with untrusted data ++ * Note1: that it works correctly only if compiled with WITH_BIG_KEY ++ * which is the default. ++ * Note2: the fast function used for a small dict won't protect very ++ * well but since the attack is based on growing a very big hash ++ * list we will use the BigKey algo as soon as the hash size grows ++ * over MIN_DICT_SIZE so this actually works ++ */ ++#if defined(HAVE_RAND) && defined(HAVE_SRAND) && defined(HAVE_TIME) ++#define DICT_RANDOMIZATION ++#endif ++ + #include <string.h> + #ifdef HAVE_STDINT_H + #include <stdint.h> +@@ -44,23 +66,23 @@ typedef unsigned __int32 uint32_t; + #define WITH_BIG_KEY + + #ifdef WITH_BIG_KEY +-#define xmlDictComputeKey(dict, name, len) \ +- (((dict)->size == MIN_DICT_SIZE) ? \ +- xmlDictComputeFastKey(name, len) : \ +- xmlDictComputeBigKey(name, len)) +- +-#define xmlDictComputeQKey(dict, prefix, plen, name, len) \ +- (((prefix) == NULL) ? \ +- (xmlDictComputeKey(dict, name, len)) : \ +- (((dict)->size == MIN_DICT_SIZE) ? \ +- xmlDictComputeFastQKey(prefix, plen, name, len) : \ +- xmlDictComputeBigQKey(prefix, plen, name, len))) ++#define xmlDictComputeKey(dict, name, len) \ ++ (((dict)->size == MIN_DICT_SIZE) ? \ ++ xmlDictComputeFastKey(name, len, (dict)->seed) : \ ++ xmlDictComputeBigKey(name, len, (dict)->seed)) ++ ++#define xmlDictComputeQKey(dict, prefix, plen, name, len) \ ++ (((prefix) == NULL) ? \ ++ (xmlDictComputeKey(dict, name, len)) : \ ++ (((dict)->size == MIN_DICT_SIZE) ? \ ++ xmlDictComputeFastQKey(prefix, plen, name, len, (dict)->seed) : \ ++ xmlDictComputeBigQKey(prefix, plen, name, len, (dict)->seed))) + + #else /* !WITH_BIG_KEY */ +-#define xmlDictComputeKey(dict, name, len) \ +- xmlDictComputeFastKey(name, len) +-#define xmlDictComputeQKey(dict, prefix, plen, name, len) \ +- xmlDictComputeFastQKey(prefix, plen, name, len) ++#define xmlDictComputeKey(dict, name, len) \ ++ xmlDictComputeFastKey(name, len, (dict)->seed) ++#define xmlDictComputeQKey(dict, prefix, plen, name, len) \ ++ xmlDictComputeFastQKey(prefix, plen, name, len, (dict)->seed) + #endif /* WITH_BIG_KEY */ + + /* +@@ -98,6 +120,8 @@ struct _xmlDict { + xmlDictStringsPtr strings; + + struct _xmlDict *subdict; ++ /* used for randomization */ ++ int seed; + }; + + /* +@@ -125,6 +149,9 @@ static int xmlInitializeDict(void) { + if ((xmlDictMutex = xmlNewRMutex()) == NULL) + return(0); + ++#ifdef DICT_RANDOMIZATION ++ srand(time(NULL)); ++#endif + xmlDictInitialized = 1; + return(1); + } +@@ -277,13 +304,13 @@ found_pool: + */ + + static uint32_t +-xmlDictComputeBigKey(const xmlChar* data, int namelen) { ++xmlDictComputeBigKey(const xmlChar* data, int namelen, int seed) { + uint32_t hash; + int i; + + if (namelen <= 0 || data == NULL) return(0); + +- hash = 0; ++ hash = seed; + + for (i = 0;i < namelen; i++) { + hash += data[i]; +@@ -310,12 +337,12 @@ xmlDictComputeBigKey(const xmlChar* data + */ + static unsigned long + xmlDictComputeBigQKey(const xmlChar *prefix, int plen, +- const xmlChar *name, int len) ++ const xmlChar *name, int len, int seed) + { + uint32_t hash; + int i; + +- hash = 0; ++ hash = seed; + + for (i = 0;i < plen; i++) { + hash += prefix[i]; +@@ -346,8 +373,8 @@ xmlDictComputeBigQKey(const xmlChar *pre + * for low hash table fill. + */ + static unsigned long +-xmlDictComputeFastKey(const xmlChar *name, int namelen) { +- unsigned long value = 0L; ++xmlDictComputeFastKey(const xmlChar *name, int namelen, int seed) { ++ unsigned long value = seed; + + if (name == NULL) return(0); + value = *name; +@@ -381,9 +408,9 @@ xmlDictComputeFastKey(const xmlChar *nam + */ + static unsigned long + xmlDictComputeFastQKey(const xmlChar *prefix, int plen, +- const xmlChar *name, int len) ++ const xmlChar *name, int len, int seed) + { +- unsigned long value = 0L; ++ unsigned long value = (unsigned long) seed; + + if (plen == 0) + value += 30 * (unsigned long) ':'; +@@ -460,6 +487,11 @@ xmlDictCreate(void) { + dict->subdict = NULL; + if (dict->dict) { + memset(dict->dict, 0, MIN_DICT_SIZE * sizeof(xmlDictEntry)); ++#ifdef DICT_RANDOMIZATION ++ dict->seed = rand(); ++#else ++ dict->seed = 0; ++#endif + return(dict); + } + xmlFree(dict); +@@ -486,6 +518,7 @@ xmlDictCreateSub(xmlDictPtr sub) { + #ifdef DICT_DEBUG_PATTERNS + fprintf(stderr, "R"); + #endif ++ dict->seed = sub->seed; + dict->subdict = sub; + xmlDictReference(dict->subdict); + } |