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x86: make guard pages ro instead of non-present

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Has the same effect of catching stack overflows, but
makes debugging with GDB simpler since we won't get
errors when inspecting such regions. Making these
areas non-present was more than we needed, read-only
is sufficient.

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
This commit is contained in:
Andrew Boie 2019-07-24 16:59:31 -07:00 • committed by Carles Cufí
commit 76310f6896
2 changed files with 7 additions and 11 deletions
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2
arch/x86/include/ia32/kernel_arch_func.h
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@ -49,7 +49,7 @@ static inline void kernel_arch_init(void)
#endif
#if CONFIG_X86_STACK_PROTECTION
z_x86_mmu_set_flags(&z_x86_kernel_pdpt, _interrupt_stack, MMU_PAGE_SIZE,
MMU_ENTRY_NOT_PRESENT, MMU_PTE_P_MASK);
MMU_ENTRY_READ, MMU_PTE_RW_MASK);
#endif
}