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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
4  Version 8.35-RC1 xx-xxxx-201x  Note that the PCRE 8.xx series (PCRE1) is now in a bugfix-only state. All
5  -----------------------------  development is happening in the PCRE2 10.xx series.
7    Version 8.38 xx-xxx-xxxx
8    ------------------------
10    1.  If a group that contained a recursive back reference also contained a
11        forward reference subroutine call followed by a non-forward-reference
12        subroutine call, for example /.((?2)(?R)\1)()/, pcre2_compile() failed to
13        compile correct code, leading to undefined behaviour or an internally
14        detected error. This bug was discovered by the LLVM fuzzer.
16    2.  Quantification of certain items (e.g. atomic back references) could cause
17        incorrect code to be compiled when recursive forward references were
18        involved. For example, in this pattern: /(?1)()((((((\1++))\x85)+)|))/.
19        This bug was discovered by the LLVM fuzzer.
21    3.  A repeated conditional group whose condition was a reference by name caused
22        a buffer overflow if there was more than one group with the given name.
23        This bug was discovered by the LLVM fuzzer.
25    4.  A recursive back reference by name within a group that had the same name as
26        another group caused a buffer overflow. For example:
27        /(?J)(?'d'(?'d'\g{d}))/. This bug was discovered by the LLVM fuzzer.
29    5.  A forward reference by name to a group whose number is the same as the
30        current group, for example in this pattern: /(?|(\k'Pm')|(?'Pm'))/, caused
31        a buffer overflow at compile time. This bug was discovered by the LLVM
32        fuzzer.
34    6.  A lookbehind assertion within a set of mutually recursive subpatterns could
35        provoke a buffer overflow. This bug was discovered by the LLVM fuzzer.
37    7.  Another buffer overflow bug involved duplicate named groups with a
38        reference between their definition, with a group that reset capture
39        numbers, for example: /(?J:(?|(?'R')(\k'R')|((?'R'))))/. This has been
40        fixed by always allowing for more memory, even if not needed. (A proper fix
41        is implemented in PCRE2, but it involves more refactoring.)
43    8.  There was no check for integer overflow in subroutine calls such as (?123).
45    9.  The table entry for \l in EBCDIC environments was incorrect, leading to its
46        being treated as a literal 'l' instead of causing an error.
48    10. There was a buffer overflow if pcre_exec() was called with an ovector of
49        size 1. This bug was found by american fuzzy lop.
51    11. If a non-capturing group containing a conditional group that could match
52        an empty string was repeated, it was not identified as matching an empty
53        string itself. For example: /^(?:(?(1)x|)+)+$()/.
55    12. In an EBCDIC environment, pcretest was mishandling the escape sequences
56        \a and \e in test subject lines.
58    13. In an EBCDIC environment, \a in a pattern was converted to the ASCII
59        instead of the EBCDIC value.
61    14. The handling of \c in an EBCDIC environment has been revised so that it is
62        now compatible with the specification in Perl's perlebcdic page.
64    15. The EBCDIC character 0x41 is a non-breaking space, equivalent to 0xa0 in
65        ASCII/Unicode. This has now been added to the list of characters that are
66        recognized as white space in EBCDIC.
68    16. When PCRE was compiled without UCP support, the use of \p and \P gave an
69        error (correctly) when used outside a class, but did not give an error
70        within a class.
72    17. \h within a class was incorrectly compiled in EBCDIC environments.
74    18. A pattern with an unmatched closing parenthesis that contained a backward
75        assertion which itself contained a forward reference caused buffer
76        overflow. And example pattern is: /(?=di(?<=(?1))|(?=(.))))/.
78    19. JIT should return with error when the compiled pattern requires more stack
79        space than the maximum.
81    20. A possessively repeated conditional group that could match an empty string,
82        for example, /(?(R))*+/, was incorrectly compiled.
84    21. Fix infinite recursion in the JIT compiler when certain patterns such as
85        /(?:|a|){100}x/ are analysed.
87    22. Some patterns with character classes involving [: and \\ were incorrectly
88        compiled and could cause reading from uninitialized memory or an incorrect
89        error diagnosis.
91    23. Pathological patterns containing many nested occurrences of [: caused
92        pcre_compile() to run for a very long time.
94    24. A conditional group with only one branch has an implicit empty alternative
95        branch and must therefore be treated as potentially matching an empty
96        string.
98    25. If (?R was followed by - or + incorrect behaviour happened instead of a
99        diagnostic.
101    26. Arrange to give up on finding the minimum matching length for overly
102        complex patterns.
104    27. Similar to (4) above: in a pattern with duplicated named groups and an
105        occurrence of (?| it is possible for an apparently non-recursive back
106        reference to become recursive if a later named group with the relevant
107        number is encountered. This could lead to a buffer overflow. Wen Guanxing
108        from Venustech ADLAB discovered this bug.
110    28. If pcregrep was given the -q option with -c or -l, or when handling a
111        binary file, it incorrectly wrote output to stdout.
113    29. The JIT compiler did not restore the control verb head in case of *THEN
114        control verbs. This issue was found by Karl Skomski with a custom LLVM
115        fuzzer.
117    30. Error messages for syntax errors following \g and \k were giving inaccurate
118        offsets in the pattern.
120    31. Added a check for integer overflow in conditions (?(<digits>) and
121        (?(R<digits>). This omission was discovered by Karl Skomski with the LLVM
122        fuzzer.
124    32. Handling recursive references such as (?2) when the reference is to a group
125        later in the pattern uses code that is very hacked about and error-prone.
126        It has been re-written for PCRE2. Here in PCRE1, a check has been added to
127        give an internal error if it is obvious that compiling has gone wrong.
129    33. The JIT compiler should not check repeats after a {0,1} repeat byte code.
130        This issue was found by Karl Skomski with a custom LLVM fuzzer.
132    34. The JIT compiler should restore the control chain for empty possessive
133        repeats. This issue was found by Karl Skomski with a custom LLVM fuzzer.
135    35. Match limit check added to JIT recursion. This issue was found by Karl
136        Skomski with a custom LLVM fuzzer.
138    36. Yet another case similar to 27 above has been circumvented by an
139        unconditional allocation of extra memory. This issue is fixed "properly" in
140        PCRE2 by refactoring the way references are handled. Wen Guanxing
141        from Venustech ADLAB discovered this bug.
143    37. Fix two assertion fails in JIT. These issues were found by Karl Skomski
144        with a custom LLVM fuzzer.
146    38. Fixed a corner case of range optimization in JIT.
148    39. An incorrect error "overran compiling workspace" was given if there were
149        exactly enough group forward references such that the last one extended
150        into the workspace safety margin. The next one would have expanded the
151        workspace. The test for overflow was not including the safety margin.
153    40. A match limit issue is fixed in JIT which was found by Karl Skomski
154        with a custom LLVM fuzzer.
156    41. Remove the use of /dev/null in testdata/testinput2, because it doesn't
157        work under Windows. (Why has it taken so long for anyone to notice?)
159    42. In a character class such as [\W\p{Any}] where both a negative-type escape
160        ("not a word character") and a property escape were present, the property
161        escape was being ignored.
164    Version 8.37 28-April-2015
165    --------------------------
167    1.  When an (*ACCEPT) is triggered inside capturing parentheses, it arranges
168        for those parentheses to be closed with whatever has been captured so far.
169        However, it was failing to mark any other groups between the hightest
170        capture so far and the currrent group as "unset". Thus, the ovector for
171        those groups contained whatever was previously there. An example is the
172        pattern /(x)|((*ACCEPT))/ when matched against "abcd".
174    2.  If an assertion condition was quantified with a minimum of zero (an odd
175        thing to do, but it happened), SIGSEGV or other misbehaviour could occur.
177    3.  If a pattern in pcretest input had the P (POSIX) modifier followed by an
178        unrecognized modifier, a crash could occur.
180    4.  An attempt to do global matching in pcretest with a zero-length ovector
181        caused a crash.
183    5.  Fixed a memory leak during matching that could occur for a subpattern
184        subroutine call (recursive or otherwise) if the number of captured groups
185        that had to be saved was greater than ten.
187    6.  Catch a bad opcode during auto-possessification after compiling a bad UTF
188        string with NO_UTF_CHECK. This is a tidyup, not a bug fix, as passing bad
189        UTF with NO_UTF_CHECK is documented as having an undefined outcome.
191    7.  A UTF pattern containing a "not" match of a non-ASCII character and a
192        subroutine reference could loop at compile time. Example: /[^\xff]((?1))/.
194    8. When a pattern is compiled, it remembers the highest back reference so that
195       when matching, if the ovector is too small, extra memory can be obtained to
196       use instead. A conditional subpattern whose condition is a check on a
197       capture having happened, such as, for example in the pattern
198       /^(?:(a)|b)(?(1)A|B)/, is another kind of back reference, but it was not
199       setting the highest backreference number. This mattered only if pcre_exec()
200       was called with an ovector that was too small to hold the capture, and there
201       was no other kind of back reference (a situation which is probably quite
202       rare). The effect of the bug was that the condition was always treated as
203       FALSE when the capture could not be consulted, leading to a incorrect
204       behaviour by pcre_exec(). This bug has been fixed.
206    9. A reference to a duplicated named group (either a back reference or a test
207       for being set in a conditional) that occurred in a part of the pattern where
208       PCRE_DUPNAMES was not set caused the amount of memory needed for the pattern
209       to be incorrectly calculated, leading to overwriting.
211    10. A mutually recursive set of back references such as (\2)(\1) caused a
212        segfault at study time (while trying to find the minimum matching length).
213        The infinite loop is now broken (with the minimum length unset, that is,
214        zero).
216    11. If an assertion that was used as a condition was quantified with a minimum
217        of zero, matching went wrong. In particular, if the whole group had
218        unlimited repetition and could match an empty string, a segfault was
219        likely. The pattern (?(?=0)?)+ is an example that caused this. Perl allows
220        assertions to be quantified, but not if they are being used as conditions,
221        so the above pattern is faulted by Perl. PCRE has now been changed so that
222        it also rejects such patterns.
224    12. A possessive capturing group such as (a)*+ with a minimum repeat of zero
225        failed to allow the zero-repeat case if pcre2_exec() was called with an
226        ovector too small to capture the group.
228    13. Fixed two bugs in pcretest that were discovered by fuzzing and reported by
229        Red Hat Product Security:
231        (a) A crash if /K and /F were both set with the option to save the compiled
232        pattern.
234        (b) Another crash if the option to print captured substrings in a callout
235        was combined with setting a null ovector, for example \O\C+ as a subject
236        string.
238    14. A pattern such as "((?2){0,1999}())?", which has a group containing a
239        forward reference repeated a large (but limited) number of times within a
240        repeated outer group that has a zero minimum quantifier, caused incorrect
241        code to be compiled, leading to the error "internal error:
242        previously-checked referenced subpattern not found" when an incorrect
243        memory address was read. This bug was reported as "heap overflow",
244        discovered by Kai Lu of Fortinet's FortiGuard Labs and given the CVE number
245        CVE-2015-2325.
247    23. A pattern such as "((?+1)(\1))/" containing a forward reference subroutine
248        call within a group that also contained a recursive back reference caused
249        incorrect code to be compiled. This bug was reported as "heap overflow",
250        discovered by Kai Lu of Fortinet's FortiGuard Labs, and given the CVE
251        number CVE-2015-2326.
253    24. Computing the size of the JIT read-only data in advance has been a source
254        of various issues, and new ones are still appear unfortunately. To fix
255        existing and future issues, size computation is eliminated from the code,
256        and replaced by on-demand memory allocation.
258    25. A pattern such as /(?i)[A-`]/, where characters in the other case are
259        adjacent to the end of the range, and the range contained characters with
260        more than one other case, caused incorrect behaviour when compiled in UTF
261        mode. In that example, the range a-j was left out of the class.
263    26. Fix JIT compilation of conditional blocks, which assertion
264        is converted to (*FAIL). E.g: /(?(?!))/.
266    27. The pattern /(?(?!)^)/ caused references to random memory. This bug was
267        discovered by the LLVM fuzzer.
269    28. The assertion (?!) is optimized to (*FAIL). This was not handled correctly
270        when this assertion was used as a condition, for example (?(?!)a|b). In
271        pcre2_match() it worked by luck; in pcre2_dfa_match() it gave an incorrect
272        error about an unsupported item.
274    29. For some types of pattern, for example /Z*(|d*){216}/, the auto-
275        possessification code could take exponential time to complete. A recursion
276        depth limit of 1000 has been imposed to limit the resources used by this
277        optimization.
279    30. A pattern such as /(*UTF)[\S\V\H]/, which contains a negated special class
280        such as \S in non-UCP mode, explicit wide characters (> 255) can be ignored
281        because \S ensures they are all in the class. The code for doing this was
282        interacting badly with the code for computing the amount of space needed to
283        compile the pattern, leading to a buffer overflow. This bug was discovered
284        by the LLVM fuzzer.
286    31. A pattern such as /((?2)+)((?1))/ which has mutual recursion nested inside
287        other kinds of group caused stack overflow at compile time. This bug was
288        discovered by the LLVM fuzzer.
290    32. A pattern such as /(?1)(?#?'){8}(a)/ which had a parenthesized comment
291        between a subroutine call and its quantifier was incorrectly compiled,
292        leading to buffer overflow or other errors. This bug was discovered by the
293        LLVM fuzzer.
295    33. The illegal pattern /(?(?<E>.*!.*)?)/ was not being diagnosed as missing an
296        assertion after (?(. The code was failing to check the character after
297        (?(?< for the ! or = that would indicate a lookbehind assertion. This bug
298        was discovered by the LLVM fuzzer.
300    34. A pattern such as /X((?2)()*+){2}+/ which has a possessive quantifier with
301        a fixed maximum following a group that contains a subroutine reference was
302        incorrectly compiled and could trigger buffer overflow. This bug was
303        discovered by the LLVM fuzzer.
305    35. A mutual recursion within a lookbehind assertion such as (?<=((?2))((?1)))
306        caused a stack overflow instead of the diagnosis of a non-fixed length
307        lookbehind assertion. This bug was discovered by the LLVM fuzzer.
309    36. The use of \K in a positive lookbehind assertion in a non-anchored pattern
310        (e.g. /(?<=\Ka)/) could make pcregrep loop.
312    37. There was a similar problem to 36 in pcretest for global matches.
314    38. If a greedy quantified \X was preceded by \C in UTF mode (e.g. \C\X*),
315        and a subsequent item in the pattern caused a non-match, backtracking over
316        the repeated \X did not stop, but carried on past the start of the subject,
317        causing reference to random memory and/or a segfault. There were also some
318        other cases where backtracking after \C could crash. This set of bugs was
319        discovered by the LLVM fuzzer.
321    39. The function for finding the minimum length of a matching string could take
322        a very long time if mutual recursion was present many times in a pattern,
323        for example, /((?2){73}(?2))((?1))/. A better mutual recursion detection
324        method has been implemented. This infelicity was discovered by the LLVM
325        fuzzer.
327    40. Static linking against the PCRE library using the pkg-config module was
328        failing on missing pthread symbols.
331    Version 8.36 26-September-2014
332    ------------------------------
334    1.  Got rid of some compiler warnings in the C++ modules that were shown up by
335        -Wmissing-field-initializers and -Wunused-parameter.
337    2.  The tests for quantifiers being too big (greater than 65535) were being
338        applied after reading the number, and stupidly assuming that integer
339        overflow would give a negative number. The tests are now applied as the
340        numbers are read.
342    3.  Tidy code in pcre_exec.c where two branches that used to be different are
343        now the same.
345    4.  The JIT compiler did not generate match limit checks for certain
346        bracketed expressions with quantifiers. This may lead to exponential
347        backtracking, instead of returning with PCRE_ERROR_MATCHLIMIT. This
348        issue should be resolved now.
350    5.  Fixed an issue, which occures when nested alternatives are optimized
351        with table jumps.
353    6.  Inserted two casts and changed some ints to size_t in the light of some
354        reported 64-bit compiler warnings (Bugzilla 1477).
356    7.  Fixed a bug concerned with zero-minimum possessive groups that could match
357        an empty string, which sometimes were behaving incorrectly in the
358        interpreter (though correctly in the JIT matcher). This pcretest input is
359        an example:
361          '\A(?:[^"]++|"(?:[^"]*+|"")*+")++'
364        the interpreter was reporting a match of 'NON QUOTED ' only, whereas the
365        JIT matcher and Perl both matched 'NON QUOTED "QUOT""ED" AFTER '. The test
366        for an empty string was breaking the inner loop and carrying on at a lower
367        level, when possessive repeated groups should always return to a higher
368        level as they have no backtrack points in them. The empty string test now
369        occurs at the outer level.
371    8.  Fixed a bug that was incorrectly auto-possessifying \w+ in the pattern
372        ^\w+(?>\s*)(?<=\w) which caused it not to match "test test".
374    9.  Give a compile-time error for \o{} (as Perl does) and for \x{} (which Perl
375        doesn't).
377    10. Change 8.34/15 introduced a bug that caused the amount of memory needed
378        to hold a pattern to be incorrectly computed (too small) when there were
379        named back references to duplicated names. This could cause "internal
380        error: code overflow" or "double free or corruption" or other memory
381        handling errors.
383    11. When named subpatterns had the same prefixes, back references could be
384        confused. For example, in this pattern:
386          /(?P<Name>a)?(?P<Name2>b)?(?(<Name>)c|d)*l/
388        the reference to 'Name' was incorrectly treated as a reference to a
389        duplicate name.
391    12. A pattern such as /^s?c/mi8 where the optional character has more than
392        one "other case" was incorrectly compiled such that it would only try to
393        match starting at "c".
395    13. When a pattern starting with \s was studied, VT was not included in the
396        list of possible starting characters; this should have been part of the
397        8.34/18 patch.
399    14. If a character class started [\Qx]... where x is any character, the class
400        was incorrectly terminated at the ].
402    15. If a pattern that started with a caseless match for a character with more
403        than one "other case" was studied, PCRE did not set up the starting code
404        unit bit map for the list of possible characters. Now it does. This is an
405        optimization improvement, not a bug fix.
407    16. The Unicode data tables have been updated to Unicode 7.0.0.
409    17. Fixed a number of memory leaks in pcregrep.
411    18. Avoid a compiler warning (from some compilers) for a function call with
412        a cast that removes "const" from an lvalue by using an intermediate
413        variable (to which the compiler does not object).
415    19. Incorrect code was compiled if a group that contained an internal recursive
416        back reference was optional (had quantifier with a minimum of zero). This
417        example compiled incorrect code: /(((a\2)|(a*)\g<-1>))*/ and other examples
418        caused segmentation faults because of stack overflows at compile time.
420    20. A pattern such as /((?(R)a|(?1)))+/, which contains a recursion within a
421        group that is quantified with an indefinite repeat, caused a compile-time
422        loop which used up all the system stack and provoked a segmentation fault.
423        This was not the same bug as 19 above.
425    21. Add PCRECPP_EXP_DECL declaration to operator<< in pcre_stringpiece.h.
426        Patch by Mike Frysinger.
429    Version 8.35 04-April-2014
430    --------------------------
432  1.  A new flag is set, when property checks are present in an XCLASS.  1.  A new flag is set, when property checks are present in an XCLASS.
433      When this flag is not set, PCRE can perform certain optimizations      When this flag is not set, PCRE can perform certain optimizations
434      such as studying these XCLASS-es.      such as studying these XCLASS-es.
436    2.  The auto-possessification of character sets were improved: a normal
437        and an extended character set can be compared now. Furthermore
438        the JIT compiler optimizes more character set checks.
440    3.  Got rid of some compiler warnings for potentially uninitialized variables
441        that show up only when compiled with -O2.
443    4.  A pattern such as (?=ab\K) that uses \K in an assertion can set the start
444        of a match later then the end of the match. The pcretest program was not
445        handling the case sensibly - it was outputting from the start to the next
446        binary zero. It now reports this situation in a message, and outputs the
447        text from the end to the start.
449    5.  Fast forward search is improved in JIT. Instead of the first three
450        characters, any three characters with fixed position can be searched.
451        Search order: first, last, middle.
453    6.  Improve character range checks in JIT. Characters are read by an inprecise
454        function now, which returns with an unknown value if the character code is
455        above a certain threshold (e.g: 256). The only limitation is that the value
456        must be bigger than the threshold as well. This function is useful when
457        the characters above the threshold are handled in the same way.
459    7.  The macros whose names start with RAWUCHAR are placeholders for a future
460        mode in which only the bottom 21 bits of 32-bit data items are used. To
461        make this more memorable for those maintaining the code, the names have
462        been changed to start with UCHAR21, and an extensive comment has been added
463        to their definition.
465    8.  Add missing (new) files sljitNativeTILEGX.c and sljitNativeTILEGX-encoder.c
466        to the export list in Makefile.am (they were accidentally omitted from the
467        8.34 tarball).
469    9.  The informational output from pcretest used the phrase "starting byte set"
470        which is inappropriate for the 16-bit and 32-bit libraries. As the output
471        for "first char" and "need char" really means "non-UTF-char", I've changed
472        "byte" to "char", and slightly reworded the output. The documentation about
473        these values has also been (I hope) clarified.
475    10. Another JIT related optimization: use table jumps for selecting the correct
476        backtracking path, when more than four alternatives are present inside a
477        bracket.
479    11. Empty match is not possible, when the minimum length is greater than zero,
480        and there is no \K in the pattern. JIT should avoid empty match checks in
481        such cases.
483    12. In a caseless character class with UCP support, when a character with more
484        than one alternative case was not the first character of a range, not all
485        the alternative cases were added to the class. For example, s and \x{17f}
486        are both alternative cases for S: the class [RST] was handled correctly,
487        but [R-T] was not.
489    13. The configure.ac file always checked for pthread support when JIT was
490        enabled. This is not used in Windows, so I have put this test inside a
491        check for the presence of windows.h (which was already tested for).
493    14. Improve pattern prefix search by a simplified Boyer-Moore algorithm in JIT.
494        The algorithm provides a way to skip certain starting offsets, and usually
495        faster than linear prefix searches.
497    15. Change 13 for 8.20 updated RunTest to check for the 'fr' locale as well
498        as for 'fr_FR' and 'french'. For some reason, however, it then used the
499        Windows-specific input and output files, which have 'french' screwed in.
500        So this could never have worked. One of the problems with locales is that
501        they aren't always the same. I have now updated RunTest so that it checks
502        the output of the locale test (test 3) against three different output
503        files, and it allows the test to pass if any one of them matches. With luck
504        this should make the test pass on some versions of Solaris where it was
505        failing. Because of the uncertainty, the script did not used to stop if
506        test 3 failed; it now does. If further versions of a French locale ever
507        come to light, they can now easily be added.
509    16. If --with-pcregrep-bufsize was given a non-integer value such as "50K",
510        there was a message during ./configure, but it did not stop. This now
511        provokes an error. The invalid example in README has been corrected.
512        If a value less than the minimum is given, the minimum value has always
513        been used, but now a warning is given.
515    17. If --enable-bsr-anycrlf was set, the special 16/32-bit test failed. This
516        was a bug in the test system, which is now fixed. Also, the list of various
517        configurations that are tested for each release did not have one with both
518        16/32 bits and --enable-bar-anycrlf. It now does.
520    18. pcretest was missing "-C bsr" for displaying the \R default setting.
522    19. Little endian PowerPC systems are supported now by the JIT compiler.
524    20. The fast forward newline mechanism could enter to an infinite loop on
525        certain invalid UTF-8 input. Although we don't support these cases
526        this issue can be fixed by a performance optimization.
528    21. Change 33 of 8.34 is not sufficient to ensure stack safety because it does
529        not take account if existing stack usage. There is now a new global
530        variable called pcre_stack_guard that can be set to point to an external
531        function to check stack availability. It is called at the start of
532        processing every parenthesized group.
534    22. A typo in the code meant that in ungreedy mode the max/min qualifier
535        behaved like a min-possessive qualifier, and, for example, /a{1,3}b/U did
536        not match "ab".
538    23. When UTF was disabled, the JIT program reported some incorrect compile
539        errors. These messages are silenced now.
541    24. Experimental support for ARM-64 and MIPS-64 has been added to the JIT
542        compiler.
544    25. Change all the temporary files used in RunGrepTest to be different to those
545        used by RunTest so that the tests can be run simultaneously, for example by
546        "make -j check".
549  Version 8.34 15-December-2013  Version 8.34 15-December-2013
550  -----------------------------  -----------------------------

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