mirror of
https://github.com/Divested-Mobile/DivestOS-Build.git
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71 lines
2.7 KiB
Diff
71 lines
2.7 KiB
Diff
From 5a0fdfada3a2aa50d7b947a2e958bf00cbe0d830 Mon Sep 17 00:00:00 2001
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From: Catalin Marinas <catalin.marinas@arm.com>
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Date: Fri, 16 May 2014 16:44:32 +0100
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Subject: Revert "arm64: Introduce execute-only page access permissions"
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This reverts commit bc07c2c6e9ed125d362af0214b6313dca180cb08.
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While the aim is increased security for --x memory maps, it does not
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protect against kernel level reads. Until SECCOMP is implemented for
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arm64, revert this patch to avoid giving a false idea of execute-only
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mappings.
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Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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---
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arch/arm64/include/asm/pgtable.h | 11 +++++------
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1 file changed, 5 insertions(+), 6 deletions(-)
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(limited to 'arch/arm64/include/asm/pgtable.h')
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diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
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index e4c60d6..aa150ed 100644
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--- a/arch/arm64/include/asm/pgtable.h
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+++ b/arch/arm64/include/asm/pgtable.h
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@@ -86,13 +86,12 @@ extern void __pgd_error(const char *file, int line, unsigned long val);
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#define PAGE_COPY_EXEC __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN)
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#define PAGE_READONLY __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_UXN)
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#define PAGE_READONLY_EXEC __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN)
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-#define PAGE_EXECONLY __pgprot(_PAGE_DEFAULT | PTE_NG | PTE_PXN)
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#define __P000 PAGE_NONE
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#define __P001 PAGE_READONLY
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#define __P010 PAGE_COPY
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#define __P011 PAGE_COPY
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-#define __P100 PAGE_EXECONLY
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+#define __P100 PAGE_READONLY_EXEC
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#define __P101 PAGE_READONLY_EXEC
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#define __P110 PAGE_COPY_EXEC
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#define __P111 PAGE_COPY_EXEC
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@@ -101,7 +100,7 @@ extern void __pgd_error(const char *file, int line, unsigned long val);
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#define __S001 PAGE_READONLY
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#define __S010 PAGE_SHARED
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#define __S011 PAGE_SHARED
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-#define __S100 PAGE_EXECONLY
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+#define __S100 PAGE_READONLY_EXEC
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#define __S101 PAGE_READONLY_EXEC
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#define __S110 PAGE_SHARED_EXEC
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#define __S111 PAGE_SHARED_EXEC
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@@ -137,8 +136,8 @@ extern struct page *empty_zero_page;
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#define pte_write(pte) (!!(pte_val(pte) & PTE_WRITE))
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#define pte_exec(pte) (!(pte_val(pte) & PTE_UXN))
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-#define pte_valid_ng(pte) \
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- ((pte_val(pte) & (PTE_VALID | PTE_NG)) == (PTE_VALID | PTE_NG))
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+#define pte_valid_user(pte) \
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+ ((pte_val(pte) & (PTE_VALID | PTE_USER)) == (PTE_VALID | PTE_USER))
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static inline pte_t pte_wrprotect(pte_t pte)
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{
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@@ -192,7 +191,7 @@ extern void __sync_icache_dcache(pte_t pteval, unsigned long addr);
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static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
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pte_t *ptep, pte_t pte)
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{
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- if (pte_valid_ng(pte)) {
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+ if (pte_valid_user(pte)) {
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if (!pte_special(pte) && pte_exec(pte))
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__sync_icache_dcache(pte, addr);
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if (pte_dirty(pte) && pte_write(pte))
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--
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cgit v1.1
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