2f9fa9ef53
This teaches ProcessElfCore to recognise the MTE tag segments. https://www.kernel.org/doc/html/latest/arm64/memory-tagging-extension.html#core-dump-support These segments contain all the tags for a matching memory segment which will have the same size in virtual address terms. In real terms it's 2 tags per byte so the data in the segment is much smaller. Since MTE is the only tag type supported I have hardcoded some things to those values. We could and should support more formats as they appear but doing so now would leave code untested until that happens. A few things to note: * /proc/pid/smaps is not in the core file, only the details you have in "maps". Meaning we mark a region tagged only if it has a tag segment. * A core file supports memory tagging if it has at least 1 memory tag segment, there is no other flag we can check to tell if memory tagging was enabled. (unlike a live process that can support memory tagging even if there are currently no tagged memory regions) Tests have been added at the commands level for a core file with mte and without. There is a lot of overlap between the "memory tag read" tests here and the unit tests for MemoryTagManagerAArch64MTE::UnpackTagsFromCoreFileSegment, but I think it's worth keeping to check ProcessElfCore doesn't cause an assert. Depends on D129487 Reviewed By: omjavaid Differential Revision: https://reviews.llvm.org/D129489 |
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