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x86: add CONFIG_X86_STACK_PROTECTION

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This enables the MMU-based stack protection feature,
which will cause a fatal error if a thread overflows
its stack in kernel mode, at a nontrivial cost in memory
(4K per thread).

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
This commit is contained in:
Andrew Boie 2017-07-14 09:37:43 -07:00 • committed by Anas Nashif
commit dff21de082
1 changed files with 10 additions and 0 deletions
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arch/x86/Kconfig
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@ -78,6 +78,16 @@ config X86_MMU
This options enables the memory management unit present in x86. Enabling
this will create boot time page table structure.
config X86_STACK_PROTECTION
bool
default n
depends on X86_MMU
prompt "MMU-based stack overflow protection"
help
This option leverages the MMU to cause a system fatal error if the
bounds of the current process stack are overflowed. This is done
by preceding all stack areas with a 4K guard page.
menu "Floating Point Options"
depends on CPU_HAS_FPU