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mm: Implement stack frame object validation

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This creates per-architecture function arch_within_stack_frames() that
should validate if a given object is contained by a kernel stack frame.
Initial implementation is on x86.

This is based on code from PaX.

Signed-off-by: Kees Cook <[email protected]>
This commit is contained in:
Kees Cook 2016-07-12 16:19:48 -07:00
commit 0f60a8efe4
4 changed files with 63 additions and 0 deletions
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9
arch/Kconfig
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@ -424,6 +424,15 @@ config CC_STACKPROTECTOR_STRONG
endchoice
config HAVE_ARCH_WITHIN_STACK_FRAMES
bool
help
An architecture should select this if it can walk the kernel stack
frames to determine if an object is part of either the arguments
or local variables (i.e. that it excludes saved return addresses,
and similar) by implementing an inline arch_within_stack_frames(),
which is used by CONFIG_HARDENED_USERCOPY.
config HAVE_CONTEXT_TRACKING
bool
help