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mm/page_poisoning.c: allow for zero poisoning

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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]>
This commit is contained in:
Laura Abbott 2016-03-15 14:56:30 -07:00 • committed by Linus Torvalds
commit 1414c7f4f7
7 changed files with 60 additions and 5 deletions
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14
mm/Kconfig.debug
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@ -65,3 +65,17 @@ config PAGE_POISONING_NO_SANITY
If you are only interested in sanitization, say Y. Otherwise
say N.
config PAGE_POISONING_ZERO
bool "Use zero for poisoning instead of random data"
depends on PAGE_POISONING
---help---
Instead of using the existing poison value, fill the pages with
zeros. This makes it harder to detect when errors are occurring
due to sanitization but the zeroing at free means that it is
no longer necessary to write zeros when GFP_ZERO is used on
allocation.
Enabling page poisoning with this option will disable hibernation
If unsure, say N