[gnutls-devel] GnuTLS | Fix timeout in gnutls_idna_parser_fuzzer (!881)

Development of GNU's TLS library gnutls-devel at lists.gnutls.org
Sat Jan 19 18:14:58 CET 2019


New Merge Request !881

https://gitlab.com/gnutls/gnutls/merge_requests/881

Branches: tmp-fix-fuzzer-timeout to master
Author:    Tim Rühsen
Assignee:  
Approvers: Simon Josefsson, Nikos Mavrogiannopoulos, Dmitry Eremin-Solenikov, Hubert Kario, Andreas Metzler, Daiki Ueno, Tom, Ander Juaristi, Tomáš Mráz, Anderson Sasaki and GnuTLS devel mailing list


Libidn2 has a O(N^2) behavior in idn2_to_ascii_8z().

    It is fast enough for real world domains, so a limit
    of 1024 for fuzzer corpora seems to be fine.
    
    The reproducer for 25s timeout had a data size of 610k.

## Checklist
 * [ ] Code modified for feature
 * [ ] Test suite updated with functionality tests
 * [ ] Test suite updated with negative tests
 * [ ] Documentation updated / NEWS entry present (for non-trivial changes)

## Reviewer's checklist:
 * [ ] Any issues marked for closing are addressed
 * [ ] There is a test suite reasonably covering new functionality or modifications
 * [ ] Function naming, parameters, return values, types, etc., are consistent and according to `CONTRIBUTION.md`
 * [ ] This feature/change has adequate documentation added
 * [ ] No obvious mistakes in the code

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