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OTS-VALIDATOR-CHECKER(1) User Commands OTS-VALIDATOR-CHECKER(1) NAME ots-validator-checker - font validation checker SYNOPSIS ots-validator-checker FONT_FILE DESCRIPTION ots-validator-checker is a program which is intended to validate mal- formed fonts. If the program detects that the font is invalid, it prints "OK" and returns with 0 (success). If it couldnt detect any er- rors, the program then opens the transcoded font and renders some char- acters using FreeType: transcoded_font = ValidateAndTranscode(malicious_font); if (validation_error) Print("OK"); OpenAndRenderSomeCharacters(transcoded_font); # may cause SIGSEGV Print("OK"); If SEGV doesn't raise inside FreeType library, the program prints "OK" and returns with 0 as well. You should run this tool under the catch- segv(1) or valgrind(1) command so that you can easily verify that all transformed fonts don't crash the library (see the example below). EXAMPLES $ for f in malformed/*.ttf ; do catchsegv ./ots-validator-checker "$f" ; done OK: the malicious font was filtered: malformed/1.ttf OK: the malicious font was filtered: malformed/2.ttf OK: FreeType2 didn't crash: malformed/3.ttf OK: the malicious font was filtered: malformed/4.ttf REPORTING BUGS Report bugs to <https://github.com/khaledhosny/ots/issues> SEE ALSO ots-idempotent(1), ots-perf(1), ots-sanitize(1), ots-side-by-side(1) OpenType Sanitizer May 2021 OTS-VALIDATOR-CHECKER(1)
NAME | SYNOPSIS | DESCRIPTION | EXAMPLES | REPORTING BUGS | SEE ALSO
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