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ARM: 8235/1: Support for the PXN CPU feature on ARMv7

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Modern ARMv7-A/R cores optionally implement below new
hardware feature:

- PXN:
Privileged execute-never(PXN) is a security feature. PXN bit
determines whether the processor can execute software from
the region. This is effective solution against ret2usr attack.
On an implementation that does not include the LPAE, PXN is
optionally supported.

This patch set PXN bit on user page table for preventing
user code execution with privilege mode.

Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Jungseung Lee <js07.lee@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Jungseung Lee
2014-11-29 02:33:30 +01:00
committed by Russell King
parent 44cb09c23f
commit 1d4d37159d
4 changed files with 29 additions and 2 deletions
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10
arch/arm/include/asm/pgalloc.h
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@@ -157,7 +157,15 @@ pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep)
static inline void
pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep)
{
__pmd_populate(pmdp, page_to_phys(ptep), _PAGE_USER_TABLE);
extern pmdval_t user_pmd_table;
pmdval_t prot;
if (__LINUX_ARM_ARCH__ >= 6 && !IS_ENABLED(CONFIG_ARM_LPAE))
prot = user_pmd_table;
else
prot = _PAGE_USER_TABLE;
__pmd_populate(pmdp, page_to_phys(ptep), prot);
}
#define pmd_pgtable(pmd) pmd_page(pmd)