64 lines
1.8 KiB
C
64 lines
1.8 KiB
C
|
// SPDX-License-Identifier: GPL-2.0
|
||
|
|
|
||
|
|
#include <linux/export.h>
|
||
|
|
#include <linux/mm.h>
|
||
|
|
#include <asm/pgtable.h>
|
||
|
|
#include <asm/mem_encrypt.h>
|
||
|
|
|
||
|
|
static pgprot_t protection_map[16] __ro_after_init = {
|
||
|
|
[VM_NONE] = PAGE_NONE,
|
||
|
|
[VM_READ] = PAGE_READONLY,
|
||
|
|
[VM_WRITE] = PAGE_COPY,
|
||
|
|
[VM_WRITE | VM_READ] = PAGE_COPY,
|
||
|
|
[VM_EXEC] = PAGE_READONLY_EXEC,
|
||
|
|
[VM_EXEC | VM_READ] = PAGE_READONLY_EXEC,
|
||
|
|
[VM_EXEC | VM_WRITE] = PAGE_COPY_EXEC,
|
||
|
|
[VM_EXEC | VM_WRITE | VM_READ] = PAGE_COPY_EXEC,
|
||
|
|
[VM_SHARED] = PAGE_NONE,
|
||
|
|
[VM_SHARED | VM_READ] = PAGE_READONLY,
|
||
|
|
[VM_SHARED | VM_WRITE] = PAGE_SHARED,
|
||
|
|
[VM_SHARED | VM_WRITE | VM_READ] = PAGE_SHARED,
|
||
|
|
[VM_SHARED | VM_EXEC] = PAGE_READONLY_EXEC,
|
||
|
|
[VM_SHARED | VM_EXEC | VM_READ] = PAGE_READONLY_EXEC,
|
||
|
|
[VM_SHARED | VM_EXEC | VM_WRITE] = PAGE_SHARED_EXEC,
|
||
|
|
[VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = PAGE_SHARED_EXEC
|
||
|
|
};
|
||
|
|
|
||
|
|
void add_encrypt_protection_map(void)
|
||
|
|
{
|
||
|
|
unsigned int i;
|
||
|
|
|
||
|
|
for (i = 0; i < ARRAY_SIZE(protection_map); i++)
|
||
|
|
protection_map[i] = pgprot_encrypted(protection_map[i]);
|
||
|
|
}
|
||
|
|
|
||
|
|
pgprot_t vm_get_page_prot(unsigned long vm_flags)
|
||
|
|
{
|
||
|
|
unsigned long val = pgprot_val(protection_map[vm_flags &
|
||
|
|
(VM_READ|VM_WRITE|VM_EXEC|VM_SHARED)]);
|
||
|
|
|
||
|
|
#ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
|
||
|
|
/*
|
||
|
|
* Take the 4 protection key bits out of the vma->vm_flags value and
|
||
|
|
* turn them in to the bits that we can put in to a pte.
|
||
|
|
*
|
||
|
|
* Only override these if Protection Keys are available (which is only
|
||
|
|
* on 64-bit).
|
||
|
|
*/
|
||
|
|
if (vm_flags & VM_PKEY_BIT0)
|
||
|
|
val |= _PAGE_PKEY_BIT0;
|
||
|
|
if (vm_flags & VM_PKEY_BIT1)
|
||
|
|
val |= _PAGE_PKEY_BIT1;
|
||
|
|
if (vm_flags & VM_PKEY_BIT2)
|
||
|
|
val |= _PAGE_PKEY_BIT2;
|
||
|
|
if (vm_flags & VM_PKEY_BIT3)
|
||
|
|
val |= _PAGE_PKEY_BIT3;
|
||
|
|
#endif
|
||
|
|
|
||
|
|
val = __sme_set(val);
|
||
|
|
if (val & _PAGE_PRESENT)
|
||
|
|
val &= __supported_pte_mask;
|
||
|
|
return __pgprot(val);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(vm_get_page_prot);
|