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Laura Abbott
1414c7f4f7
By default, page poisoning uses a poison value (0xaa) on free. If this is changed to 0, the page is not only sanitized but zeroing on alloc with __GFP_ZERO can be skipped as well. The tradeoff is that detecting corruption from the poisoning is harder to detect. This feature also cannot be used with hibernation since pages are not guaranteed to be zeroed after hibernation. Credit to Grsecurity/PaX team for inspiring this work Signed-off-by: Laura Abbott <[email protected]> Acked-by: Rafael J. Wysocki <[email protected]> Cc: "Kirill A. Shutemov" <[email protected]> Cc: Vlastimil Babka <[email protected]> Cc: Michal Hocko <[email protected]> Cc: Kees Cook <[email protected]> Cc: Mathias Krause <[email protected]> Cc: Dave Hansen <[email protected]> Cc: Jianyu Zhan <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>