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  */
  26 static 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 */