b0f71f1bc5
Interrupt and exception handlers must call kmsan_intr_enter() prior to calling any C code. This is because the KMSAN runtime maintains some TLS in order to track initialization state of function parameters and return values across function calls. Then, to ensure that this state is kept consistent in the face of asynchronous kernel-mode excpeptions, the runtime uses a stack of TLS blocks, and kmsan_intr_enter() and kmsan_intr_leave() push and pop that stack, respectively. Use these functions in amd64 interrupt and exception handlers. Note that handlers for user->kernel transitions need not be annotated. Also ensure that trap frames pushed by the CPU and by handlers are marked as initialized before they are used. Reviewed by: kib Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D31467 |
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