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mm: SLAB hardened usercopy support

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Under CONFIG_HARDENED_USERCOPY, this adds object size checking to the
SLAB allocator to catch any copies that may span objects.

Based on code from PaX and grsecurity.

Signed-off-by: Kees Cook <keescook@chromium.org>
Tested-by: Valdis Kletnieks <valdis.kletnieks@vt.edu>
This commit is contained in:
Kees Cook
2016-06-23 15:20:59 -07:00
parent 97433ea4fd
commit 04385fc5e8
2 changed files with 31 additions and 0 deletions
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init/Kconfig
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@@ -1758,6 +1758,7 @@ choice
config SLAB
bool "SLAB"
select HAVE_HARDENED_USERCOPY_ALLOCATOR
help
The regular slab allocator that is established and known to work
well in all environments. It organizes cache hot objects in