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openSUSE:Leap:15.4:Update
libxml2.31448
libxml2-CVE-2022-40303.patch
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File libxml2-CVE-2022-40303.patch of Package libxml2.31448
From ffaec75809a315457891a0e54f8828bc6e056067 Mon Sep 17 00:00:00 2001 From: Nick Wellnhofer <wellnhofer@aevum.de> Date: Thu, 25 Aug 2022 17:43:08 +0200 Subject: [PATCH] Fix integer overflows with XML_PARSE_HUGE Also impose size limits when XML_PARSE_HUGE is set. Limit size of names to XML_MAX_TEXT_LENGTH (10 million bytes) and other content to XML_MAX_HUGE_LENGTH (1 billion bytes). Move some the length checks to the end of the respective loop to make them strict. xmlParseEntityValue didn't have a length limitation at all. But without XML_PARSE_HUGE, this should eventually trigger an error in xmlGROW. Thanks to Maddie Stone working with Google Project Zero for the report! --- parser.c | 233 +++++++++++++++++++++++++++++-------------------------- 1 file changed, 121 insertions(+), 112 deletions(-) Index: libxml2-2.9.14/parser.c =================================================================== --- libxml2-2.9.14.orig/parser.c +++ libxml2-2.9.14/parser.c @@ -115,6 +115,8 @@ xmlParseElementEnd(xmlParserCtxtPtr ctxt * * ************************************************************************/ +#define XML_MAX_HUGE_LENGTH 1000000000 + #define XML_PARSER_BIG_ENTITY 1000 #define XML_PARSER_LOT_ENTITY 5000 @@ -565,7 +567,7 @@ xmlFatalErr(xmlParserCtxtPtr ctxt, xmlPa errmsg = "Malformed declaration expecting version"; break; case XML_ERR_NAME_TOO_LONG: - errmsg = "Name too long use XML_PARSE_HUGE option"; + errmsg = "Name too long"; break; #if 0 case: @@ -3210,6 +3212,9 @@ xmlParseNameComplex(xmlParserCtxtPtr ctx int len = 0, l; int c; int count = 0; + int maxLength = (ctxt->options & XML_PARSE_HUGE) ? + XML_MAX_TEXT_LENGTH : + XML_MAX_NAME_LENGTH; #ifdef DEBUG nbParseNameComplex++; @@ -3275,7 +3280,8 @@ xmlParseNameComplex(xmlParserCtxtPtr ctx if (ctxt->instate == XML_PARSER_EOF) return(NULL); } - len += l; + if (len <= INT_MAX - l) + len += l; NEXTL(l); c = CUR_CHAR(l); } @@ -3301,13 +3307,13 @@ xmlParseNameComplex(xmlParserCtxtPtr ctx if (ctxt->instate == XML_PARSER_EOF) return(NULL); } - len += l; + if (len <= INT_MAX - l) + len += l; NEXTL(l); c = CUR_CHAR(l); } } - if ((len > XML_MAX_NAME_LENGTH) && - ((ctxt->options & XML_PARSE_HUGE) == 0)) { + if (len > maxLength) { xmlFatalErr(ctxt, XML_ERR_NAME_TOO_LONG, "Name"); return(NULL); } @@ -3346,7 +3352,10 @@ const xmlChar * xmlParseName(xmlParserCtxtPtr ctxt) { const xmlChar *in; const xmlChar *ret; - int count = 0; + size_t count = 0; + size_t maxLength = (ctxt->options & XML_PARSE_HUGE) ? + XML_MAX_TEXT_LENGTH : + XML_MAX_NAME_LENGTH; GROW; @@ -3370,8 +3379,7 @@ xmlParseName(xmlParserCtxtPtr ctxt) { in++; if ((*in > 0) && (*in < 0x80)) { count = in - ctxt->input->cur; - if ((count > XML_MAX_NAME_LENGTH) && - ((ctxt->options & XML_PARSE_HUGE) == 0)) { + if (count > maxLength) { xmlFatalErr(ctxt, XML_ERR_NAME_TOO_LONG, "Name"); return(NULL); } @@ -3392,6 +3400,9 @@ xmlParseNCNameComplex(xmlParserCtxtPtr c int len = 0, l; int c; int count = 0; + int maxLength = (ctxt->options & XML_PARSE_HUGE) ? + XML_MAX_TEXT_LENGTH : + XML_MAX_NAME_LENGTH; size_t startPosition = 0; #ifdef DEBUG @@ -3412,17 +3423,13 @@ xmlParseNCNameComplex(xmlParserCtxtPtr c while ((c != ' ') && (c != '>') && (c != '/') && /* test bigname.xml */ (xmlIsNameChar(ctxt, c) && (c != ':'))) { if (count++ > XML_PARSER_CHUNK_SIZE) { - if ((len > XML_MAX_NAME_LENGTH) && - ((ctxt->options & XML_PARSE_HUGE) == 0)) { - xmlFatalErr(ctxt, XML_ERR_NAME_TOO_LONG, "NCName"); - return(NULL); - } count = 0; GROW; if (ctxt->instate == XML_PARSER_EOF) return(NULL); } - len += l; + if (len <= INT_MAX - l) + len += l; NEXTL(l); c = CUR_CHAR(l); if (c == 0) { @@ -3440,8 +3447,7 @@ xmlParseNCNameComplex(xmlParserCtxtPtr c c = CUR_CHAR(l); } } - if ((len > XML_MAX_NAME_LENGTH) && - ((ctxt->options & XML_PARSE_HUGE) == 0)) { + if (len > maxLength) { xmlFatalErr(ctxt, XML_ERR_NAME_TOO_LONG, "NCName"); return(NULL); } @@ -3467,7 +3473,10 @@ static const xmlChar * xmlParseNCName(xmlParserCtxtPtr ctxt) { const xmlChar *in, *e; const xmlChar *ret; - int count = 0; + size_t count = 0; + size_t maxLength = (ctxt->options & XML_PARSE_HUGE) ? + XML_MAX_TEXT_LENGTH : + XML_MAX_NAME_LENGTH; #ifdef DEBUG nbParseNCName++; @@ -3492,8 +3501,7 @@ xmlParseNCName(xmlParserCtxtPtr ctxt) { goto complex; if ((*in > 0) && (*in < 0x80)) { count = in - ctxt->input->cur; - if ((count > XML_MAX_NAME_LENGTH) && - ((ctxt->options & XML_PARSE_HUGE) == 0)) { + if (count > maxLength) { xmlFatalErr(ctxt, XML_ERR_NAME_TOO_LONG, "NCName"); return(NULL); } @@ -3575,6 +3583,9 @@ xmlParseStringName(xmlParserCtxtPtr ctxt const xmlChar *cur = *str; int len = 0, l; int c; + int maxLength = (ctxt->options & XML_PARSE_HUGE) ? + XML_MAX_TEXT_LENGTH : + XML_MAX_NAME_LENGTH; #ifdef DEBUG nbParseStringName++; @@ -3610,12 +3621,6 @@ xmlParseStringName(xmlParserCtxtPtr ctxt if (len + 10 > max) { xmlChar *tmp; - if ((len > XML_MAX_NAME_LENGTH) && - ((ctxt->options & XML_PARSE_HUGE) == 0)) { - xmlFatalErr(ctxt, XML_ERR_NAME_TOO_LONG, "NCName"); - xmlFree(buffer); - return(NULL); - } max *= 2; tmp = (xmlChar *) xmlRealloc(buffer, max * sizeof(xmlChar)); @@ -3629,14 +3634,18 @@ xmlParseStringName(xmlParserCtxtPtr ctxt COPY_BUF(l,buffer,len,c); cur += l; c = CUR_SCHAR(cur, l); + if (len > maxLength) { + xmlFatalErr(ctxt, XML_ERR_NAME_TOO_LONG, "NCName"); + xmlFree(buffer); + return(NULL); + } } buffer[len] = 0; *str = cur; return(buffer); } } - if ((len > XML_MAX_NAME_LENGTH) && - ((ctxt->options & XML_PARSE_HUGE) == 0)) { + if (len > maxLength) { xmlFatalErr(ctxt, XML_ERR_NAME_TOO_LONG, "NCName"); return(NULL); } @@ -3663,6 +3672,9 @@ xmlParseNmtoken(xmlParserCtxtPtr ctxt) { int len = 0, l; int c; int count = 0; + int maxLength = (ctxt->options & XML_PARSE_HUGE) ? + XML_MAX_TEXT_LENGTH : + XML_MAX_NAME_LENGTH; #ifdef DEBUG nbParseNmToken++; @@ -3714,12 +3726,6 @@ xmlParseNmtoken(xmlParserCtxtPtr ctxt) { if (len + 10 > max) { xmlChar *tmp; - if ((max > XML_MAX_NAME_LENGTH) && - ((ctxt->options & XML_PARSE_HUGE) == 0)) { - xmlFatalErr(ctxt, XML_ERR_NAME_TOO_LONG, "NmToken"); - xmlFree(buffer); - return(NULL); - } max *= 2; tmp = (xmlChar *) xmlRealloc(buffer, max * sizeof(xmlChar)); @@ -3733,6 +3739,11 @@ xmlParseNmtoken(xmlParserCtxtPtr ctxt) { COPY_BUF(l,buffer,len,c); NEXTL(l); c = CUR_CHAR(l); + if (len > maxLength) { + xmlFatalErr(ctxt, XML_ERR_NAME_TOO_LONG, "NmToken"); + xmlFree(buffer); + return(NULL); + } } buffer[len] = 0; return(buffer); @@ -3740,8 +3751,7 @@ xmlParseNmtoken(xmlParserCtxtPtr ctxt) { } if (len == 0) return(NULL); - if ((len > XML_MAX_NAME_LENGTH) && - ((ctxt->options & XML_PARSE_HUGE) == 0)) { + if (len > maxLength) { xmlFatalErr(ctxt, XML_ERR_NAME_TOO_LONG, "NmToken"); return(NULL); } @@ -3767,6 +3777,9 @@ xmlParseEntityValue(xmlParserCtxtPtr ctx int len = 0; int size = XML_PARSER_BUFFER_SIZE; int c, l; + int maxLength = (ctxt->options & XML_PARSE_HUGE) ? + XML_MAX_HUGE_LENGTH : + XML_MAX_TEXT_LENGTH; xmlChar stop; xmlChar *ret = NULL; const xmlChar *cur = NULL; @@ -3826,6 +3839,12 @@ xmlParseEntityValue(xmlParserCtxtPtr ctx GROW; c = CUR_CHAR(l); } + + if (len > maxLength) { + xmlFatalErrMsg(ctxt, XML_ERR_ENTITY_NOT_FINISHED, + "entity value too long\n"); + goto error; + } } buf[len] = 0; if (ctxt->instate == XML_PARSER_EOF) @@ -3913,6 +3932,9 @@ xmlParseAttValueComplex(xmlParserCtxtPtr xmlChar *rep = NULL; size_t len = 0; size_t buf_size = 0; + size_t maxLength = (ctxt->options & XML_PARSE_HUGE) ? + XML_MAX_HUGE_LENGTH : + XML_MAX_TEXT_LENGTH; int c, l, in_space = 0; xmlChar *current = NULL; xmlEntityPtr ent; @@ -3944,16 +3966,6 @@ xmlParseAttValueComplex(xmlParserCtxtPtr while (((NXT(0) != limit) && /* checked */ (IS_CHAR(c)) && (c != '<')) && (ctxt->instate != XML_PARSER_EOF)) { - /* - * Impose a reasonable limit on attribute size, unless XML_PARSE_HUGE - * special option is given - */ - if ((len > XML_MAX_TEXT_LENGTH) && - ((ctxt->options & XML_PARSE_HUGE) == 0)) { - xmlFatalErrMsg(ctxt, XML_ERR_ATTRIBUTE_NOT_FINISHED, - "AttValue length too long\n"); - goto mem_error; - } if (c == '&') { in_space = 0; if (NXT(1) == '#') { @@ -4101,6 +4113,11 @@ xmlParseAttValueComplex(xmlParserCtxtPtr } GROW; c = CUR_CHAR(l); + if (len > maxLength) { + xmlFatalErrMsg(ctxt, XML_ERR_ATTRIBUTE_NOT_FINISHED, + "AttValue length too long\n"); + goto mem_error; + } } if (ctxt->instate == XML_PARSER_EOF) goto error; @@ -4122,16 +4139,6 @@ xmlParseAttValueComplex(xmlParserCtxtPtr } else NEXT; - /* - * There we potentially risk an overflow, don't allow attribute value of - * length more than INT_MAX it is a very reasonable assumption ! - */ - if (len >= INT_MAX) { - xmlFatalErrMsg(ctxt, XML_ERR_ATTRIBUTE_NOT_FINISHED, - "AttValue length too long\n"); - goto mem_error; - } - if (attlen != NULL) *attlen = (int) len; return(buf); @@ -4202,6 +4209,9 @@ xmlParseSystemLiteral(xmlParserCtxtPtr c int len = 0; int size = XML_PARSER_BUFFER_SIZE; int cur, l; + int maxLength = (ctxt->options & XML_PARSE_HUGE) ? + XML_MAX_TEXT_LENGTH : + XML_MAX_NAME_LENGTH; xmlChar stop; int state = ctxt->instate; int count = 0; @@ -4229,13 +4239,6 @@ xmlParseSystemLiteral(xmlParserCtxtPtr c if (len + 5 >= size) { xmlChar *tmp; - if ((size > XML_MAX_NAME_LENGTH) && - ((ctxt->options & XML_PARSE_HUGE) == 0)) { - xmlFatalErr(ctxt, XML_ERR_NAME_TOO_LONG, "SystemLiteral"); - xmlFree(buf); - ctxt->instate = (xmlParserInputState) state; - return(NULL); - } size *= 2; tmp = (xmlChar *) xmlRealloc(buf, size * sizeof(xmlChar)); if (tmp == NULL) { @@ -4264,6 +4267,12 @@ xmlParseSystemLiteral(xmlParserCtxtPtr c SHRINK; cur = CUR_CHAR(l); } + if (len > maxLength) { + xmlFatalErr(ctxt, XML_ERR_NAME_TOO_LONG, "SystemLiteral"); + xmlFree(buf); + ctxt->instate = (xmlParserInputState) state; + return(NULL); + } } buf[len] = 0; ctxt->instate = (xmlParserInputState) state; @@ -4291,6 +4300,9 @@ xmlParsePubidLiteral(xmlParserCtxtPtr ct xmlChar *buf = NULL; int len = 0; int size = XML_PARSER_BUFFER_SIZE; + int maxLength = (ctxt->options & XML_PARSE_HUGE) ? + XML_MAX_TEXT_LENGTH : + XML_MAX_NAME_LENGTH; xmlChar cur; xmlChar stop; int count = 0; @@ -4318,12 +4330,6 @@ xmlParsePubidLiteral(xmlParserCtxtPtr ct if (len + 1 >= size) { xmlChar *tmp; - if ((size > XML_MAX_NAME_LENGTH) && - ((ctxt->options & XML_PARSE_HUGE) == 0)) { - xmlFatalErr(ctxt, XML_ERR_NAME_TOO_LONG, "Public ID"); - xmlFree(buf); - return(NULL); - } size *= 2; tmp = (xmlChar *) xmlRealloc(buf, size * sizeof(xmlChar)); if (tmp == NULL) { @@ -4351,6 +4357,11 @@ xmlParsePubidLiteral(xmlParserCtxtPtr ct SHRINK; cur = CUR; } + if (len > maxLength) { + xmlFatalErr(ctxt, XML_ERR_NAME_TOO_LONG, "Public ID"); + xmlFree(buf); + return(NULL); + } } buf[len] = 0; if (cur != stop) { @@ -4750,6 +4761,9 @@ xmlParseCommentComplex(xmlParserCtxtPtr int r, rl; int cur, l; size_t count = 0; + size_t maxLength = (ctxt->options & XML_PARSE_HUGE) ? + XML_MAX_HUGE_LENGTH : + XML_MAX_TEXT_LENGTH; int inputid; inputid = ctxt->input->id; @@ -4795,13 +4809,6 @@ xmlParseCommentComplex(xmlParserCtxtPtr if ((r == '-') && (q == '-')) { xmlFatalErr(ctxt, XML_ERR_HYPHEN_IN_COMMENT, NULL); } - if ((len > XML_MAX_TEXT_LENGTH) && - ((ctxt->options & XML_PARSE_HUGE) == 0)) { - xmlFatalErrMsgStr(ctxt, XML_ERR_COMMENT_NOT_FINISHED, - "Comment too big found", NULL); - xmlFree (buf); - return; - } if (len + 5 >= size) { xmlChar *new_buf; size_t new_size; @@ -4839,6 +4846,13 @@ xmlParseCommentComplex(xmlParserCtxtPtr GROW; cur = CUR_CHAR(l); } + + if (len > maxLength) { + xmlFatalErrMsgStr(ctxt, XML_ERR_COMMENT_NOT_FINISHED, + "Comment too big found", NULL); + xmlFree (buf); + return; + } } buf[len] = 0; if (cur == 0) { @@ -4883,6 +4897,9 @@ xmlParseComment(xmlParserCtxtPtr ctxt) { xmlChar *buf = NULL; size_t size = XML_PARSER_BUFFER_SIZE; size_t len = 0; + size_t maxLength = (ctxt->options & XML_PARSE_HUGE) ? + XML_MAX_HUGE_LENGTH : + XML_MAX_TEXT_LENGTH; xmlParserInputState state; const xmlChar *in; size_t nbchar = 0; @@ -4966,8 +4983,7 @@ get_more: buf[len] = 0; } } - if ((len > XML_MAX_TEXT_LENGTH) && - ((ctxt->options & XML_PARSE_HUGE) == 0)) { + if (len > maxLength) { xmlFatalErrMsgStr(ctxt, XML_ERR_COMMENT_NOT_FINISHED, "Comment too big found", NULL); xmlFree (buf); @@ -5167,6 +5183,9 @@ xmlParsePI(xmlParserCtxtPtr ctxt) { xmlChar *buf = NULL; size_t len = 0; size_t size = XML_PARSER_BUFFER_SIZE; + size_t maxLength = (ctxt->options & XML_PARSE_HUGE) ? + XML_MAX_HUGE_LENGTH : + XML_MAX_TEXT_LENGTH; int cur, l; const xmlChar *target; xmlParserInputState state; @@ -5242,14 +5261,6 @@ xmlParsePI(xmlParserCtxtPtr ctxt) { return; } count = 0; - if ((len > XML_MAX_TEXT_LENGTH) && - ((ctxt->options & XML_PARSE_HUGE) == 0)) { - xmlFatalErrMsgStr(ctxt, XML_ERR_PI_NOT_FINISHED, - "PI %s too big found", target); - xmlFree(buf); - ctxt->instate = state; - return; - } } COPY_BUF(l,buf,len,cur); NEXTL(l); @@ -5259,15 +5270,14 @@ xmlParsePI(xmlParserCtxtPtr ctxt) { GROW; cur = CUR_CHAR(l); } + if (len > maxLength) { + xmlFatalErrMsgStr(ctxt, XML_ERR_PI_NOT_FINISHED, + "PI %s too big found", target); + xmlFree(buf); + ctxt->instate = state; + return; + } } - if ((len > XML_MAX_TEXT_LENGTH) && - ((ctxt->options & XML_PARSE_HUGE) == 0)) { - xmlFatalErrMsgStr(ctxt, XML_ERR_PI_NOT_FINISHED, - "PI %s too big found", target); - xmlFree(buf); - ctxt->instate = state; - return; - } buf[len] = 0; if (cur != '?') { xmlFatalErrMsgStr(ctxt, XML_ERR_PI_NOT_FINISHED, @@ -8959,6 +8969,9 @@ xmlParseAttValueInternal(xmlParserCtxtPt const xmlChar *in = NULL, *start, *end, *last; xmlChar *ret = NULL; int line, col; + int maxLength = (ctxt->options & XML_PARSE_HUGE) ? + XML_MAX_HUGE_LENGTH : + XML_MAX_TEXT_LENGTH; GROW; in = (xmlChar *) CUR_PTR; @@ -8998,8 +9011,7 @@ xmlParseAttValueInternal(xmlParserCtxtPt start = in; if (in >= end) { GROW_PARSE_ATT_VALUE_INTERNAL(ctxt, in, start, end) - if (((in - start) > XML_MAX_TEXT_LENGTH) && - ((ctxt->options & XML_PARSE_HUGE) == 0)) { + if ((in - start) > maxLength) { xmlFatalErrMsg(ctxt, XML_ERR_ATTRIBUTE_NOT_FINISHED, "AttValue length too long\n"); return(NULL); @@ -9012,8 +9024,7 @@ xmlParseAttValueInternal(xmlParserCtxtPt if ((*in++ == 0x20) && (*in == 0x20)) break; if (in >= end) { GROW_PARSE_ATT_VALUE_INTERNAL(ctxt, in, start, end) - if (((in - start) > XML_MAX_TEXT_LENGTH) && - ((ctxt->options & XML_PARSE_HUGE) == 0)) { + if ((in - start) > maxLength) { xmlFatalErrMsg(ctxt, XML_ERR_ATTRIBUTE_NOT_FINISHED, "AttValue length too long\n"); return(NULL); @@ -9046,16 +9057,14 @@ xmlParseAttValueInternal(xmlParserCtxtPt last = last + delta; } end = ctxt->input->end; - if (((in - start) > XML_MAX_TEXT_LENGTH) && - ((ctxt->options & XML_PARSE_HUGE) == 0)) { + if ((in - start) > maxLength) { xmlFatalErrMsg(ctxt, XML_ERR_ATTRIBUTE_NOT_FINISHED, "AttValue length too long\n"); return(NULL); } } } - if (((in - start) > XML_MAX_TEXT_LENGTH) && - ((ctxt->options & XML_PARSE_HUGE) == 0)) { + if ((in - start) > maxLength) { xmlFatalErrMsg(ctxt, XML_ERR_ATTRIBUTE_NOT_FINISHED, "AttValue length too long\n"); return(NULL); @@ -9068,8 +9077,7 @@ xmlParseAttValueInternal(xmlParserCtxtPt col++; if (in >= end) { GROW_PARSE_ATT_VALUE_INTERNAL(ctxt, in, start, end) - if (((in - start) > XML_MAX_TEXT_LENGTH) && - ((ctxt->options & XML_PARSE_HUGE) == 0)) { + if ((in - start) > maxLength) { xmlFatalErrMsg(ctxt, XML_ERR_ATTRIBUTE_NOT_FINISHED, "AttValue length too long\n"); return(NULL); @@ -9077,8 +9085,7 @@ xmlParseAttValueInternal(xmlParserCtxtPt } } last = in; - if (((in - start) > XML_MAX_TEXT_LENGTH) && - ((ctxt->options & XML_PARSE_HUGE) == 0)) { + if ((in - start) > maxLength) { xmlFatalErrMsg(ctxt, XML_ERR_ATTRIBUTE_NOT_FINISHED, "AttValue length too long\n"); return(NULL); @@ -9768,6 +9775,9 @@ xmlParseCDSect(xmlParserCtxtPtr ctxt) { int s, sl; int cur, l; int count = 0; + int maxLength = (ctxt->options & XML_PARSE_HUGE) ? + XML_MAX_HUGE_LENGTH : + XML_MAX_TEXT_LENGTH; /* Check 2.6.0 was NXT(0) not RAW */ if (CMP9(CUR_PTR, '<', '!', '[', 'C', 'D', 'A', 'T', 'A', '[')) { @@ -9801,13 +9811,6 @@ xmlParseCDSect(xmlParserCtxtPtr ctxt) { if (len + 5 >= size) { xmlChar *tmp; - if ((size > XML_MAX_TEXT_LENGTH) && - ((ctxt->options & XML_PARSE_HUGE) == 0)) { - xmlFatalErrMsgStr(ctxt, XML_ERR_CDATA_NOT_FINISHED, - "CData section too big found", NULL); - xmlFree (buf); - return; - } tmp = (xmlChar *) xmlRealloc(buf, size * 2 * sizeof(xmlChar)); if (tmp == NULL) { xmlFree(buf); @@ -9834,6 +9837,12 @@ xmlParseCDSect(xmlParserCtxtPtr ctxt) { } NEXTL(l); cur = CUR_CHAR(l); + if (len > maxLength) { + xmlFatalErrMsg(ctxt, XML_ERR_CDATA_NOT_FINISHED, + "CData section too big found\n"); + xmlFree(buf); + return; + } } buf[len] = 0; ctxt->instate = XML_PARSER_CONTENT;
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