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878ba03932
calc_vm_prot_bits() takes PROT_{READ,WRITE,EXECUTE} bits and
turns them in to the vma->vm_flags/VM_* bits. We need to do a
similar thing for protection keys.
We take a protection key (4 bits) and encode it in to the 4
VM_PKEY_* bits.
Note: this code is not new. It was simply a part of the
mprotect_pkey() patch in the past. I broke it out for use
in the execute-only support.
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Dave Hansen <dave@sr71.net>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: linux-mm@kvack.org
Link: http://lkml.kernel.org/r/20160212210237.CFB94AD5@viggo.jf.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
34 lines
1.0 KiB
C
34 lines
1.0 KiB
C
#ifndef _ASM_X86_MMAN_H
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#define _ASM_X86_MMAN_H
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#define MAP_32BIT 0x40 /* only give out 32bit addresses */
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#define MAP_HUGE_2MB (21 << MAP_HUGE_SHIFT)
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#define MAP_HUGE_1GB (30 << MAP_HUGE_SHIFT)
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#ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
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/*
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* Take the 4 protection key bits out of the vma->vm_flags
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* value and turn them in to the bits that we can put in
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* to a pte.
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*
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* Only override these if Protection Keys are available
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* (which is only on 64-bit).
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*/
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#define arch_vm_get_page_prot(vm_flags) __pgprot( \
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((vm_flags) & VM_PKEY_BIT0 ? _PAGE_PKEY_BIT0 : 0) | \
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((vm_flags) & VM_PKEY_BIT1 ? _PAGE_PKEY_BIT1 : 0) | \
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((vm_flags) & VM_PKEY_BIT2 ? _PAGE_PKEY_BIT2 : 0) | \
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((vm_flags) & VM_PKEY_BIT3 ? _PAGE_PKEY_BIT3 : 0))
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#define arch_calc_vm_prot_bits(prot, key) ( \
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((key) & 0x1 ? VM_PKEY_BIT0 : 0) | \
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((key) & 0x2 ? VM_PKEY_BIT1 : 0) | \
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((key) & 0x4 ? VM_PKEY_BIT2 : 0) | \
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((key) & 0x8 ? VM_PKEY_BIT3 : 0))
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#endif
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#include <asm-generic/mman.h>
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#endif /* _ASM_X86_MMAN_H */
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