LXR linux/include/linux/pkeys.h

   1#ifndef _LINUX_PKEYS_H
   2#define _LINUX_PKEYS_H
   3
   4#include <linux/mm_types.h>
   5#include <asm/mmu_context.h>
   6
   7#define PKEY_DISABLE_ACCESS     0x1
   8#define PKEY_DISABLE_WRITE      0x2
   9#define PKEY_ACCESS_MASK        (PKEY_DISABLE_ACCESS |\
  10                                 PKEY_DISABLE_WRITE)
  11
  12#ifdef CONFIG_ARCH_HAS_PKEYS
  13#include <asm/pkeys.h>
  14#else /* ! CONFIG_ARCH_HAS_PKEYS */
  15#define arch_max_pkey() (1)
  16#define execute_only_pkey(mm) (0)
  17#define arch_override_mprotect_pkey(vma, prot, pkey) (0)
  18#define PKEY_DEDICATED_EXECUTE_ONLY 0
  19#endif /* ! CONFIG_ARCH_HAS_PKEYS */
  20
  21/*
  22 * This is called from mprotect_pkey().
  23 *
  24 * Returns true if the protection keys is valid.
  25 */
  26static inline bool validate_pkey(int pkey)
  27{
  28        if (pkey < 0)
  29                return false;
  30        return (pkey < arch_max_pkey());
  31}
  32
  33#endif /* _LINUX_PKEYS_H */
  34