https://bugs.exim.org/show_bug.cgi?id=2299
Bug ID: 2299
Summary: PCRE 10.31: Normalize output of
'pcre2_serialize_encode'
Product: PCRE
Version: 10.31 (PCRE2)
Hardware: x86
OS: Linux
Status: NEW
Severity: bug
Priority: medium
Component: Code
Assignee: ph10@???
Reporter: stvar@???
CC: pcre-dev@???
Created attachment 1097
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https://bugs.exim.org/attachment.cgi?id=1097&action=edit
Normalize output of 'pcre2_serialize_encode'
Dear Philip,
First of all thank you very much for your great work!
Using PCRE2 v10.31 within one of my projects [1] (those
parts are to be released soon), I noticed the following
issue of function 'pcre2_serialize_encode':
Different instances of the same program calling this
function on the same input produces non-identical output!
This is to say that 'pcre2_serialize_encode' is in fact
non-deterministic.
Looking into the code, I learned that the reason of this
is that pointers are saved as such within the sequence of
bytes returned by 'pcre2_serialize_encode'. The values of
these pointers have no meaning for serialization as such:
their values will anyway be overwritten by the function
'pcre2_serialize_decode' when reconstructing the pattern
structures.
As far as I can see, there is no ground for these values
be left untouched by 'pcre2_serialize_encode'. On the
contrary, reseting them make the automated testing of
programs using PCRE2 an easier task.
Sincerely,
Stefan Vargyas.
[1] Json-Type,
http://www.nongnu.org/json-type/
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