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Before Windows Vista, TLS directories were ignored by Ldr* in any module loaded after process creation, which meant that the TLS index in any delay-loaded module remained 0. This means that when running an application targeting Vista and above and its delay-load modules have TLS directories, the following events can happen:
One or more delay-load modules claim ThreadLocalStoragePointer idx 0, resulting in data corruption and possible buffer overflows as data intended for one of the immediate-load modules is overwritten.
None of the immediate-load modules has a TLS directory, so ThreadLocalStoragePointer is not initialized. This means that the program crashes when one of the delay-load modules attempts to access its TLS data.
Adding implicit TLS support improves support for NT 6.x/10 user-mode applications, including all contemporary major web browsers.
JIRA issue: CORE-19413
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Co-authored-by: Justin Miller <justin.miller@reactos.org>