4b136ef259
KMSAN instrumentation requires thread-local storage to track initialization state for function parameters and return values. This buffer is accessed as part of each function prologue. It is provided by the KMSAN runtime, which looks up a pointer in the current thread's structure. When KMSAN is configured, init_secondary() is instrumented, but this means that GS.base must be initialized first, otherwise the runtime cannot safely access curthread. Work around this by loading GS.base before calling init_secondary(), so that the runtime can at least check curthread == NULL and return a pointer to some dummy storage. Note that init_secondary() still must reload GS.base after calling lgdt(), which loads a selector into %gs, which in turn clears the base register. Reviewed by: kib MFC after: 2 weeks Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D31336 |
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