This patchset adds a new hardware tag-based mode to KASAN [1]. The new mode
is similar to the existing software tag-based KASAN, but relies on arm64
Memory Tagging Extension (MTE) [2] to perform memory and pointer tagging
(instead of shadow memory and compiler instrumentation).
What does one need to do to enable MTE in the kernel? I am trying to color some kernel module data, but when I call mte_get_mem_tag after calling mte_set_mem_tag_range, I get an invalid value. I have assured that mte_assign_mem_tag_range has been called in mte_set_mem_tag_range, so the initial sanity checks pass. Thanks.
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