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x86/uaccess: Provide untagged_addr() and remove tags before address c…
…heck untagged_addr() is a helper used by the core-mm to strip tag bits and get the address to the canonical shape based on rules of the current thread. It only handles userspace addresses. The untagging mask is stored in per-CPU variable and set on context switching to the task. The tags must not be included into check whether it's okay to access the userspace address. Strip tags in access_ok(). Signed-off-by: Kirill A. Shutemov <[email protected]> Signed-off-by: Dave Hansen <[email protected]> Acked-by: Peter Zijlstra (Intel) <[email protected]> Tested-by: Alexander Potapenko <[email protected]> Link: https://lore.kernel.org/all/20230312112612.31869-7-kirill.shutemov%40linux.intel.com
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