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| OTS-VALIDATOR-CHECKER(1) | User Commands | OTS-VALIDATOR-CHECKER(1) |
NAME
ots-validator-checker - font validation checkerSYNOPSIS
ots-validator-checker FONT_FILEDESCRIPTION
ots-validator-checker is a program which is intended to validate malformed fonts. If the program detects that the font is invalid, it prints “OK” and returns with 0 (success). If it couldn’t detect any errors, the program then opens the transcoded font and renders some characters 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 catchsegv(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)| May 2021 | OpenType Sanitizer |
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