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This patch is a part of a series that extends kernel ABI to allow to pass tagged user pointers (with the top byte set to something else other than 0x00) as syscall arguments. mm/gup.c provides a kernel interface that accepts user addresses and manipulates user pages directly (for example get_user_pages, that is used by the futex syscall). Since a user can provided tagged addresses, we need to handle this case. Add untagging to gup.c functions that use user addresses for vma lookups. Link: http://lkml.kernel.org/r/4731bddba3c938658c10ff4ed55cc01c60f4c8f8.1563904656.git.andreyknvl@google.com Signed-off-by: Andrey Konovalov <[email protected]> Reviewed-by: Khalid Aziz <[email protected]> Reviewed-by: Vincenzo Frascino <[email protected]> Reviewed-by: Kees Cook <[email protected]> Reviewed-by: Catalin Marinas <[email protected]> Cc: Al Viro <[email protected]> Cc: Dave Hansen <[email protected]> Cc: Eric Auger <[email protected]> Cc: Felix Kuehling <[email protected]> Cc: Jens Wiklander <[email protected]> Cc: Mauro Carvalho Chehab <[email protected]> Cc: Mike Rapoport <[email protected]> Cc: Will Deacon <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
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