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Up to now, it was working by chance. Indeed, due to the invalid ASCII check performed before calling FsRtlIsAnsiCharacterLegalHpfs(), the macro is improperly called and overruns the FsRtlLegalAnsiCharacterArray buffer. Fortunately, up to now, right after that buffer in kernel binary there are strings which are more or less consistent with the flags that are expected by the macro, causing a decent behavior of FsRtlIsAnsiCharacterLegalHpfs() even for extended ASCII characters (whereas FsRtlIsAnsiCharacterLegalHpfs() is only designed for ASCII characters). But this is a totally out of control and wrong behavior. A single change in the way the kernel was built could have caused the CDFS driver not to work as previously. I have made the choice to allow any extended ASCII character as done for the unicode characters. This is a good compromise to avoid drastic regressions for users having extended ASCII characters in their CD file names. This imports proposed upstream commit 1b6b625641dffb49951e60398e1a9c672318ea71 See pull request https://github.com/Microsoft/Windows-driver-samples/pull/278 CORE-14067 |
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