kc3-lang/harfbuzz/test/fuzzing

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  • Hash : 64fa5cd4
    Author : Behdad Esfahbod
    Date : 2023-02-07T15:50:36 

    [GPOS] Fix assert fail introduced recently

Was introduced in 8708b9e081192786c027bb7f5f23d76dbe5c19e8.

If these lookups are recursed to from (Chain)Context out-of-order,
it was possible that last_base > buffer->idx, in which case we
were attaching marks to a base after them... and an assertion
was failing fortunately.

Fixes https://oss-fuzz.com/testcase-detail/6377756666757120

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    Git SSH git@git.kmx.io:kc3-lang/harfbuzz.git
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    Description

    HarfBuzz text shaping engine
    Users
    		 thodg_m kc3_lang_org thodg_w www_kmx_io thodg_l thodg
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  • README.md

  • To build the fuzzers with libFuzzer to perform actual fuzzing, build with:

    CXX=clang++ CXXFLAGS="-fsanitize=address,fuzzer-no-link" meson fuzzbuild --default-library=static -Dfuzzer_ldflags="-fsanitize=address,fuzzer"

ninja -Cfuzzbuild

    Then, run the fuzzer like this:

    fuzzbuild/test/fuzzing/hb-{shape,draw,subset,set}-fuzzer [-max_len=2048] [CORPUS_DIR]

    Where max_len specifies the maximal length of font files to handle. The smaller the faster.

    For more details consult the following locations:

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