OpenSystemsDevelopment / qpdf

Commit ad527a64f93dca12f6aabab2ca99ae5eb352ab4b

Authored by Jay Berkenbilt
1 parent 85f05cc5

Parse iteratively to avoid stack overflow (fixes #146)

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Showing 6 changed files with 170 additions and 108 deletions
ChangeLog
  View file @ad527a6
1 1 2017-08-25 Jay Berkenbilt <ejb@ql.org>
2 2  
  3 + * Re-implement parser iteratively to avoid stack overflow on very
  4 + deeply nested arrays and dictionaries. Fixes #146.
  5 +
3 6 * Detect infinite loop while finding additional xref tables. Fixes
4 7 #149.
5 8  
... ...
include/qpdf/QPDFObjectHandle.hh
  View file @ad527a6
... ... @@ -667,7 +667,6 @@ class QPDFObjectHandle
667 667 std::string const& object_description,
668 668 QPDFTokenizer& tokenizer, bool& empty,
669 669 StringDecrypter* decrypter, QPDF* context,
670   - bool in_array, bool in_dictionary,
671 670 bool content_stream);
672 671 static void parseContentStream_internal(
673 672 PointerHolder<Buffer> stream_data,
... ...
libqpdf/QPDFObjectHandle.cc
  View file @ad527a6
... ... @@ -883,8 +883,7 @@ QPDFObjectHandle::parseContentStream_internal(PointerHolder&lt;Buffer&gt; stream_data,
883 883 while (static_cast<size_t>(input->tell()) < length)
884 884 {
885 885 QPDFObjectHandle obj =
886   - parseInternal(input, "content", tokenizer, empty,
887   - 0, 0, false, false, true);
  886 + parseInternal(input, "content", tokenizer, empty, 0, 0, true);
888 887 if (! obj.isInitialized())
889 888 {
890 889 // EOF
... ... @@ -945,7 +944,7 @@ QPDFObjectHandle::parse(PointerHolder&lt;InputSource&gt; input,
945 944 StringDecrypter* decrypter, QPDF* context)
946 945 {
947 946 return parseInternal(input, object_description, tokenizer, empty,
948   - decrypter, context, false, false, false);
  947 + decrypter, context, false);
949 948 }
950 949  
951 950 QPDFObjectHandle
... ... @@ -953,7 +952,6 @@ QPDFObjectHandle::parseInternal(PointerHolder&lt;InputSource&gt; input,
953 952 std::string const& object_description,
954 953 QPDFTokenizer& tokenizer, bool& empty,
955 954 StringDecrypter* decrypter, QPDF* context,
956   - bool in_array, bool in_dictionary,
957 955 bool content_stream)
958 956 {
959 957 // This method must take care not to resolve any objects. Don't
... ... @@ -962,22 +960,23 @@ QPDFObjectHandle::parseInternal(PointerHolder&lt;InputSource&gt; input,
962 960 // of reading the object and changing the file pointer.
963 961  
964 962 empty = false;
965   - if (in_dictionary && in_array)
966   - {
967   - // Although dictionaries and arrays arbitrarily nest, these
968   - // variables indicate what is at the top of the stack right
969   - // now, so they can, by definition, never both be true.
970   - throw std::logic_error(
971   - "INTERNAL ERROR: parseInternal: in_dict && in_array");
972   - }
973 963  
974 964 QPDFObjectHandle object;
975 965  
976   - qpdf_offset_t offset = input->tell();
977   - std::vector<QPDFObjectHandle> olist;
  966 + std::vector<std::vector<QPDFObjectHandle> > olist_stack;
  967 + olist_stack.push_back(std::vector<QPDFObjectHandle>());
  968 + enum state_e { st_top, st_start, st_stop, st_eof, st_dictionary, st_array };
  969 + std::vector<state_e> state_stack;
  970 + state_stack.push_back(st_top);
  971 + std::vector<qpdf_offset_t> offset_stack;
  972 + offset_stack.push_back(input->tell());
978 973 bool done = false;
979 974 while (! done)
980 975 {
  976 + std::vector<QPDFObjectHandle>& olist = olist_stack.back();
  977 + state_e state = state_stack.back();
  978 + qpdf_offset_t offset = offset_stack.back();
  979 +
981 980 object = QPDFObjectHandle();
982 981  
983 982 QPDFTokenizer::Token token =
... ... @@ -988,8 +987,7 @@ QPDFObjectHandle::parseInternal(PointerHolder&lt;InputSource&gt; input,
988 987 case QPDFTokenizer::tt_eof:
989 988 if (content_stream)
990 989 {
991   - // Return uninitialized object to indicate EOF
992   - return object;
  990 + state = st_eof;
993 991 }
994 992 else
995 993 {
... ... @@ -1012,9 +1010,9 @@ QPDFObjectHandle::parseInternal(PointerHolder&lt;InputSource&gt; input,
1012 1010 break;
1013 1011  
1014 1012 case QPDFTokenizer::tt_array_close:
1015   - if (in_array)
  1013 + if (state == st_array)
1016 1014 {
1017   - done = true;
  1015 + state = st_stop;
1018 1016 }
1019 1017 else
1020 1018 {
... ... @@ -1029,9 +1027,9 @@ QPDFObjectHandle::parseInternal(PointerHolder&lt;InputSource&gt; input,
1029 1027 break;
1030 1028  
1031 1029 case QPDFTokenizer::tt_dict_close:
1032   - if (in_dictionary)
  1030 + if (state == st_dictionary)
1033 1031 {
1034   - done = true;
  1032 + state = st_stop;
1035 1033 }
1036 1034 else
1037 1035 {
... ... @@ -1046,15 +1044,13 @@ QPDFObjectHandle::parseInternal(PointerHolder&lt;InputSource&gt; input,
1046 1044 break;
1047 1045  
1048 1046 case QPDFTokenizer::tt_array_open:
1049   - object = parseInternal(
1050   - input, object_description, tokenizer, empty,
1051   - decrypter, context, true, false, content_stream);
1052   - break;
1053   -
1054 1047 case QPDFTokenizer::tt_dict_open:
1055   - object = parseInternal(
1056   - input, object_description, tokenizer, empty,
1057   - decrypter, context, false, true, content_stream);
  1048 + olist_stack.push_back(std::vector<QPDFObjectHandle>());
  1049 + state = st_start;
  1050 + offset_stack.push_back(input->tell());
  1051 + state_stack.push_back(
  1052 + (token.getType() == QPDFTokenizer::tt_array_open) ?
  1053 + st_array : st_dictionary);
1058 1054 break;
1059 1055  
1060 1056 case QPDFTokenizer::tt_bool:
... ... @@ -1084,12 +1080,12 @@ QPDFObjectHandle::parseInternal(PointerHolder&lt;InputSource&gt; input,
1084 1080 {
1085 1081 object = QPDFObjectHandle::newOperator(value);
1086 1082 }
1087   - else if ((value == "R") && (in_array || in_dictionary) &&
1088   - (olist.size() >= 2) &&
1089   - (! olist.at(olist.size() - 1).isIndirect()) &&
1090   - (olist.at(olist.size() - 1).isInteger()) &&
1091   - (! olist.at(olist.size() - 2).isIndirect()) &&
1092   - (olist.at(olist.size() - 2).isInteger()))
  1083 + else if ((value == "R") && (state != st_top) &&
  1084 + (olist.size() >= 2) &&
  1085 + (! olist.at(olist.size() - 1).isIndirect()) &&
  1086 + (olist.at(olist.size() - 1).isInteger()) &&
  1087 + (! olist.at(olist.size() - 2).isIndirect()) &&
  1088 + (olist.at(olist.size() - 2).isInteger()))
1093 1089 {
1094 1090 if (context == 0)
1095 1091 {
... ... @@ -1106,8 +1102,7 @@ QPDFObjectHandle::parseInternal(PointerHolder&lt;InputSource&gt; input,
1106 1102 olist.pop_back();
1107 1103 olist.pop_back();
1108 1104 }
1109   - else if ((value == "endobj") &&
1110   - (! (in_array || in_dictionary)))
  1105 + else if ((value == "endobj") && (state == st_top))
1111 1106 {
1112 1107 // We just saw endobj without having read
1113 1108 // anything. Treat this as a null and do not move
... ... @@ -1153,93 +1148,132 @@ QPDFObjectHandle::parseInternal(PointerHolder&lt;InputSource&gt; input,
1153 1148 break;
1154 1149 }
1155 1150  
1156   - if (in_dictionary || in_array)
1157   - {
1158   - if (! done)
1159   - {
1160   - olist.push_back(object);
1161   - }
1162   - }
1163   - else if (! object.isInitialized())
1164   - {
1165   - warn(context,
1166   - QPDFExc(qpdf_e_damaged_pdf, input->getName(),
1167   - object_description,
1168   - input->getLastOffset(),
1169   - "parse error while reading object"));
  1151 + if ((! object.isInitialized()) &&
  1152 + (! ((state == st_start) ||
  1153 + (state == st_stop) ||
  1154 + (state == st_eof))))
  1155 + {
  1156 + throw std::logic_error(
  1157 + "QPDFObjectHandle::parseInternal: "
  1158 + "unexpected uninitialized object");
1170 1159 object = newNull();
1171   - }
1172   - else
1173   - {
1174   - done = true;
1175   - }
1176   - }
  1160 + }
1177 1161  
1178   - if (in_array)
1179   - {
1180   - object = newArray(olist);
1181   - }
1182   - else if (in_dictionary)
1183   - {
1184   - // Convert list to map. Alternating elements are keys. Attempt
1185   - // to recover more or less gracefully from invalid
1186   - // dictionaries.
1187   - std::set<std::string> names;
1188   - for (std::vector<QPDFObjectHandle>::iterator iter = olist.begin();
1189   - iter != olist.end(); ++iter)
  1162 + switch (state)
1190 1163 {
1191   - if ((! (*iter).isIndirect()) && (*iter).isName())
  1164 + case st_eof:
  1165 + if (state_stack.size() > 1)
1192 1166 {
1193   - names.insert((*iter).getName());
  1167 + warn(context,
  1168 + QPDFExc(qpdf_e_damaged_pdf, input->getName(),
  1169 + object_description,
  1170 + input->getLastOffset(),
  1171 + "parse error while reading object"));
1194 1172 }
1195   - }
  1173 + done = true;
  1174 + // Leave object uninitialized to indicate EOF
  1175 + break;
1196 1176  
1197   - std::map<std::string, QPDFObjectHandle> dict;
1198   - int next_fake_key = 1;
1199   - for (unsigned int i = 0; i < olist.size(); ++i)
1200   - {
1201   - QPDFObjectHandle key_obj = olist.at(i);
1202   - QPDFObjectHandle val;
1203   - if (key_obj.isIndirect() || (! key_obj.isName()))
  1177 + case st_dictionary:
  1178 + case st_array:
  1179 + olist.push_back(object);
  1180 + break;
  1181 +
  1182 + case st_top:
  1183 + done = true;
  1184 + break;
  1185 +
  1186 + case st_start:
  1187 + break;
  1188 +
  1189 + case st_stop:
  1190 + if ((state_stack.size() < 2) || (olist_stack.size() < 2))
  1191 + {
  1192 + throw std::logic_error(
  1193 + "QPDFObjectHandle::parseInternal: st_stop encountered"
  1194 + " with insufficient elements in stack");
  1195 + }
  1196 + state_e old_state = state_stack.back();
  1197 + state_stack.pop_back();
  1198 + if (old_state == st_array)
1204 1199 {
1205   - bool found_fake = false;
1206   - std::string candidate;
1207   - while (! found_fake)
  1200 + object = newArray(olist);
  1201 + }
  1202 + else if (old_state == st_dictionary)
  1203 + {
  1204 + // Convert list to map. Alternating elements are keys.
  1205 + // Attempt to recover more or less gracefully from
  1206 + // invalid dictionaries.
  1207 + std::set<std::string> names;
  1208 + for (std::vector<QPDFObjectHandle>::iterator iter =
  1209 + olist.begin();
  1210 + iter != olist.end(); ++iter)
  1211 + {
  1212 + if ((! (*iter).isIndirect()) && (*iter).isName())
  1213 + {
  1214 + names.insert((*iter).getName());
  1215 + }
  1216 + }
  1217 +
  1218 + std::map<std::string, QPDFObjectHandle> dict;
  1219 + int next_fake_key = 1;
  1220 + for (unsigned int i = 0; i < olist.size(); ++i)
1208 1221 {
1209   - candidate =
1210   - "/QPDFFake" + QUtil::int_to_string(next_fake_key++);
1211   - found_fake = (names.count(candidate) == 0);
1212   - QTC::TC("qpdf", "QPDFObjectHandle found fake",
1213   - (found_fake ? 0 : 1));
  1222 + QPDFObjectHandle key_obj = olist.at(i);
  1223 + QPDFObjectHandle val;
  1224 + if (key_obj.isIndirect() || (! key_obj.isName()))
  1225 + {
  1226 + bool found_fake = false;
  1227 + std::string candidate;
  1228 + while (! found_fake)
  1229 + {
  1230 + candidate =
  1231 + "/QPDFFake" +
  1232 + QUtil::int_to_string(next_fake_key++);
  1233 + found_fake = (names.count(candidate) == 0);
  1234 + QTC::TC("qpdf", "QPDFObjectHandle found fake",
  1235 + (found_fake ? 0 : 1));
  1236 + }
  1237 + warn(context,
  1238 + QPDFExc(
  1239 + qpdf_e_damaged_pdf,
  1240 + input->getName(), object_description, offset,
  1241 + "expected dictionary key but found"
  1242 + " non-name object; inserting key " +
  1243 + candidate));
  1244 + val = key_obj;
  1245 + key_obj = newName(candidate);
  1246 + }
  1247 + else if (i + 1 >= olist.size())
  1248 + {
  1249 + QTC::TC("qpdf", "QPDFObjectHandle no val for last key");
  1250 + warn(context,
  1251 + QPDFExc(
  1252 + qpdf_e_damaged_pdf,
  1253 + input->getName(), object_description, offset,
  1254 + "dictionary ended prematurely; "
  1255 + "using null as value for last key"));
  1256 + val = newNull();
  1257 + }
  1258 + else
  1259 + {
  1260 + val = olist.at(++i);
  1261 + }
  1262 + dict[key_obj.getName()] = val;
1214 1263 }
1215   - warn(context,
1216   - QPDFExc(
1217   - qpdf_e_damaged_pdf,
1218   - input->getName(), object_description, offset,
1219   - "expected dictionary key but found"
1220   - " non-name object; inserting key " +
1221   - candidate));
1222   - val = key_obj;
1223   - key_obj = newName(candidate);
  1264 + object = newDictionary(dict);
1224 1265 }
1225   - else if (i + 1 >= olist.size())
  1266 + olist_stack.pop_back();
  1267 + offset_stack.pop_back();
  1268 + if (state_stack.back() == st_top)
1226 1269 {
1227   - QTC::TC("qpdf", "QPDFObjectHandle no val for last key");
1228   - warn(context,
1229   - QPDFExc(
1230   - qpdf_e_damaged_pdf,
1231   - input->getName(), object_description, offset,
1232   - "dictionary ended prematurely; using null as value"
1233   - " for last key"));
1234   - val = newNull();
  1270 + done = true;
1235 1271 }
1236 1272 else
1237 1273 {
1238   - val = olist.at(++i);
  1274 + olist_stack.back().push_back(object);
1239 1275 }
1240   - dict[key_obj.getName()] = val;
1241 1276 }
1242   - object = newDictionary(dict);
1243 1277 }
1244 1278  
1245 1279 return object;
... ...
qpdf/qtest/qpdf.test
  View file @ad527a6
... ... @@ -221,6 +221,7 @@ my @bug_tests = (
221 221 ["141a", "/W entry size 0", 2],
222 222 ["141b", "/W entry size 0", 2],
223 223 ["143", "self-referential ostream", 3],
  224 + ["146", "very deeply nested array", 2],
224 225 ["149", "xref prev pointer loop", 3],
225 226 );
226 227 $n_tests += scalar(@bug_tests);
... ...
qpdf/qtest/qpdf/issue-146.out 0 → 100644
  View file @ad527a6
  1 +WARNING: issue-146.pdf: file is damaged
  2 +WARNING: issue-146.pdf: can't find startxref
  3 +WARNING: issue-146.pdf: Attempting to reconstruct cross-reference table
  4 +WARNING: issue-146.pdf (trailer, file position 20728): unknown token while reading object; treating as string
  5 +issue-146.pdf (trailer, file position 20732): EOF while reading token
... ...
qpdf/qtest/qpdf/issue-146.pdf 0 → 100644
  View file @ad527a6
  1 +%PDF-1.4 0 obj
  2 +
  3 +1 0 obj
  4 +<</Type//Parent 4 0 R/Reces 6 0 R/Meox[092]/S/Trcy/CS/DeRGB/I true>>0 R>1>>
  5 +endobj
  6 +
  7 +7 0 obj
  8 +<</Type/log/s 4 /Opeion[1 0 R =X 0]
  9 +/Lang(en-US)
  10 +>>
  11 +endo>
  12 +endobj 9
  13 +0n
  14 +trailer
  15 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9/Root 7 0 R
  16 +/Info 8 0 R
  17 +/ID [ <F0E> ]
  18 +/Dum /
  19 +>>
  20 +EOF
... ...