[pcre-dev] [Bug 1786] Possible Stack Corruption from crafted…

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Autor: admin
Data:  
A: pcre-dev
Assumpte: [pcre-dev] [Bug 1786] Possible Stack Corruption from crafted pattern
https://bugs.exim.org/show_bug.cgi?id=1786

Philip Hazel <ph10@???> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |INVALID


--- Comment #1 from Philip Hazel <ph10@???> ---
Your pattern uses \C in UTF-8 mode. This is documented as being not a good
idea. This is what the documentation (man pcre2pattern) says:

Because \C breaks up characters into individual code units, matching one unit
with \C in UTF-8 or UTF-16 mode means that the rest of the string may start
with a malformed UTF character. This has undefined results, because PCRE2
assumes that it is matching character by character in a valid UTF string (by
default it checks the subject string's validity at the start of processing
unless the PCRE2_NO_UTF_CHECK option is used).

An application can lock out the use of \C by setting the
PCRE2_NEVER_BACKSLASH_C option when compiling a pattern. It is also possible to
build PCRE2 with the use of \C permanently disabled.

I suggest that you use PCRE2_NEVER_BACKSLASH_C when generating random patterns
using a fuzzer.

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