+++ /dev/null
-ticket:12888 UText, problems with handling of bad UTF-8
-
-Fixes:
-
-CVE-2017-7867 - International Components for Unicode (ICU) for C/C++ before
-2017-02-13 has an out-of-bounds write caused by a heap-based buffer overflow
-related to the utf8TextAccess function in common/utext.cpp and the
-utext_setNativeIndex* function.
-
-CVE-2017-7868 - International Components for Unicode (ICU) for C/C++ before
-2017-02-13 has an out-of-bounds write caused by a heap-based buffer overflow
-related to the utf8TextAccess function in common/utext.cpp and the
-utext_moveIndex32* function.
-
-Upstream: http://bugs.icu-project.org/trac/changeset/39671
-
-Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
-
-Index: /trunk/icu4c/source/common/utext.cpp
-===================================================================
---- icu4c/source/common/utext.cpp (revision 39670)
-+++ icu4c/source/common/utext.cpp (revision 39671)
-@@ -848,7 +848,13 @@
-
- // Chunk size.
--// Must be less than 85, because of byte mapping from UChar indexes to native indexes.
--// Worst case is three native bytes to one UChar. (Supplemenaries are 4 native bytes
--// to two UChars.)
-+// Must be less than 42 (256/6), because of byte mapping from UChar indexes to native indexes.
-+// Worst case there are six UTF-8 bytes per UChar.
-+// obsolete 6 byte form fd + 5 trails maps to fffd
-+// obsolete 5 byte form fc + 4 trails maps to fffd
-+// non-shortest 4 byte forms maps to fffd
-+// normal supplementaries map to a pair of utf-16, two utf8 bytes per utf-16 unit
-+// mapToUChars array size must allow for the worst case, 6.
-+// This could be brought down to 4, by treating fd and fc as pure illegal,
-+// rather than obsolete lead bytes. But that is not compatible with the utf-8 access macros.
- //
- enum { UTF8_TEXT_CHUNK_SIZE=32 };
-@@ -890,5 +896,5 @@
- // one for a supplementary starting in the last normal position,
- // and one for an entry for the buffer limit position.
-- uint8_t mapToUChars[UTF8_TEXT_CHUNK_SIZE*3+6]; // Map native offset from bufNativeStart to
-+ uint8_t mapToUChars[UTF8_TEXT_CHUNK_SIZE*6+6]; // Map native offset from bufNativeStart to
- // correspoding offset in filled part of buf.
- int32_t align;
-@@ -1033,4 +1039,5 @@
- u8b = (UTF8Buf *)ut->p; // the current buffer
- mapIndex = ix - u8b->toUCharsMapStart;
-+ U_ASSERT(mapIndex < (int32_t)sizeof(UTF8Buf::mapToUChars));
- ut->chunkOffset = u8b->mapToUChars[mapIndex] - u8b->bufStartIdx;
- return TRUE;
-@@ -1299,4 +1306,8 @@
- // If index is at the end, there is no character there to look at.
- if (ix != ut->b) {
-+ // Note: this function will only move the index back if it is on a trail byte
-+ // and there is a preceding lead byte and the sequence from the lead
-+ // through this trail could be part of a valid UTF-8 sequence
-+ // Otherwise the index remains unchanged.
- U8_SET_CP_START(s8, 0, ix);
- }
-@@ -1312,5 +1323,8 @@
- uint8_t *mapToNative = u8b->mapToNative;
- uint8_t *mapToUChars = u8b->mapToUChars;
-- int32_t toUCharsMapStart = ix - (UTF8_TEXT_CHUNK_SIZE*3 + 1);
-+ int32_t toUCharsMapStart = ix - sizeof(UTF8Buf::mapToUChars) + 1;
-+ // Note that toUCharsMapStart can be negative. Happens when the remaining
-+ // text from current position to the beginning is less than the buffer size.
-+ // + 1 because mapToUChars must have a slot at the end for the bufNativeLimit entry.
- int32_t destIx = UTF8_TEXT_CHUNK_SIZE+2; // Start in the overflow region
- // at end of buffer to leave room
-@@ -1339,4 +1353,5 @@
- // Special case ASCII range for speed.
- buf[destIx] = (UChar)c;
-+ U_ASSERT(toUCharsMapStart <= srcIx);
- mapToUChars[srcIx - toUCharsMapStart] = (uint8_t)destIx;
- mapToNative[destIx] = (uint8_t)(srcIx - toUCharsMapStart);
-@@ -1368,4 +1383,5 @@
- mapToUChars[sIx-- - toUCharsMapStart] = (uint8_t)destIx;
- } while (sIx >= srcIx);
-+ U_ASSERT(toUCharsMapStart <= (srcIx+1));
-
- // Set native indexing limit to be the current position.
-@@ -1542,4 +1558,5 @@
- U_ASSERT(index<=ut->chunkNativeLimit);
- int32_t mapIndex = index - u8b->toUCharsMapStart;
-+ U_ASSERT(mapIndex < (int32_t)sizeof(UTF8Buf::mapToUChars));
- int32_t offset = u8b->mapToUChars[mapIndex] - u8b->bufStartIdx;
- U_ASSERT(offset>=0 && offset<=ut->chunkLength);
-Index: /trunk/icu4c/source/test/intltest/utxttest.cpp
-===================================================================
---- icu4c/source/test/intltest/utxttest.cpp (revision 39670)
-+++ icu4c/source/test/intltest/utxttest.cpp (revision 39671)
-@@ -68,4 +68,6 @@
- case 7: name = "Ticket12130";
- if (exec) Ticket12130(); break;
-+ case 8: name = "Ticket12888";
-+ if (exec) Ticket12888(); break;
- default: name = ""; break;
- }
-@@ -1584,2 +1586,62 @@
- utext_close(&ut);
- }
-+
-+// Ticket 12888: bad handling of illegal utf-8 containing many instances of the archaic, now illegal,
-+// six byte utf-8 forms. Original implementation had an assumption that
-+// there would be at most three utf-8 bytes per UTF-16 code unit.
-+// The five and six byte sequences map to a single replacement character.
-+
-+void UTextTest::Ticket12888() {
-+ const char *badString =
-+ "\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80"
-+ "\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80"
-+ "\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80"
-+ "\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80"
-+ "\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80"
-+ "\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80"
-+ "\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80"
-+ "\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80"
-+ "\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80"
-+ "\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80"
-+ "\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80"
-+ "\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80"
-+ "\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80"
-+ "\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80"
-+ "\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80"
-+ "\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80"
-+ "\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80"
-+ "\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80"
-+ "\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80"
-+ "\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80\xfd\x80\x80\x80\x80\x80";
-+
-+ UErrorCode status = U_ZERO_ERROR;
-+ LocalUTextPointer ut(utext_openUTF8(NULL, badString, -1, &status));
-+ TEST_SUCCESS(status);
-+ for (;;) {
-+ UChar32 c = utext_next32(ut.getAlias());
-+ if (c == U_SENTINEL) {
-+ break;
-+ }
-+ }
-+ int32_t endIdx = utext_getNativeIndex(ut.getAlias());
-+ if (endIdx != (int32_t)strlen(badString)) {
-+ errln("%s:%d expected=%d, actual=%d", __FILE__, __LINE__, strlen(badString), endIdx);
-+ return;
-+ }
-+
-+ for (int32_t prevIndex = endIdx; prevIndex>0;) {
-+ UChar32 c = utext_previous32(ut.getAlias());
-+ int32_t currentIndex = utext_getNativeIndex(ut.getAlias());
-+ if (c != 0xfffd) {
-+ errln("%s:%d (expected, actual, index) = (%d, %d, %d)\n",
-+ __FILE__, __LINE__, 0xfffd, c, currentIndex);
-+ break;
-+ }
-+ if (currentIndex != prevIndex - 6) {
-+ errln("%s:%d: wrong index. Expected, actual = %d, %d",
-+ __FILE__, __LINE__, prevIndex - 6, currentIndex);
-+ break;
-+ }
-+ prevIndex = currentIndex;
-+ }
-+}
-Index: /trunk/icu4c/source/test/intltest/utxttest.h
-===================================================================
---- icu4c/source/test/intltest/utxttest.h (revision 39670)
-+++ icu4c/source/test/intltest/utxttest.h (revision 39671)
-@@ -39,4 +39,5 @@
- void Ticket10983();
- void Ticket12130();
-+ void Ticket12888();
-
- private:
projects / buildroot.git / commitdiff