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s390/mmap: randomize mmap base for bottom up direction
Implement mmap base randomization for the bottom up direction, so ASLR works for both mmap layouts on s390. See also commit df54d6f ("x86 get_unmapped_area(): use proper mmap base for bottom-up direction"). Signed-off-by: Heiko Carstens <[email protected]> Cc: Radu Caragea <[email protected]> Cc: Michel Lespinasse <[email protected]> Cc: Catalin Marinas <[email protected]> Cc: Will Deacon <[email protected]> Cc: Chris Metcalf <[email protected]> Cc: Martin Schwidefsky <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
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