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Linux/arch/x86/include/asm/pkeys.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef _ASM_X86_PKEYS_H
  3 #define _ASM_X86_PKEYS_H
  4 
  5 #define ARCH_DEFAULT_PKEY       0
  6 
  7 #define arch_max_pkey() (boot_cpu_has(X86_FEATURE_OSPKE) ? 16 : 1)
  8 
  9 extern int arch_set_user_pkey_access(struct task_struct *tsk, int pkey,
 10                 unsigned long init_val);
 11 
 12 static inline bool arch_pkeys_enabled(void)
 13 {
 14         return boot_cpu_has(X86_FEATURE_OSPKE);
 15 }
 16 
 17 /*
 18  * Try to dedicate one of the protection keys to be used as an
 19  * execute-only protection key.
 20  */
 21 extern int __execute_only_pkey(struct mm_struct *mm);
 22 static inline int execute_only_pkey(struct mm_struct *mm)
 23 {
 24         if (!boot_cpu_has(X86_FEATURE_OSPKE))
 25                 return ARCH_DEFAULT_PKEY;
 26 
 27         return __execute_only_pkey(mm);
 28 }
 29 
 30 extern int __arch_override_mprotect_pkey(struct vm_area_struct *vma,
 31                 int prot, int pkey);
 32 static inline int arch_override_mprotect_pkey(struct vm_area_struct *vma,
 33                 int prot, int pkey)
 34 {
 35         if (!boot_cpu_has(X86_FEATURE_OSPKE))
 36                 return 0;
 37 
 38         return __arch_override_mprotect_pkey(vma, prot, pkey);
 39 }
 40 
 41 extern int __arch_set_user_pkey_access(struct task_struct *tsk, int pkey,
 42                 unsigned long init_val);
 43 
 44 #define ARCH_VM_PKEY_FLAGS (VM_PKEY_BIT0 | VM_PKEY_BIT1 | VM_PKEY_BIT2 | VM_PKEY_BIT3)
 45 
 46 #define mm_pkey_allocation_map(mm)      (mm->context.pkey_allocation_map)
 47 #define mm_set_pkey_allocated(mm, pkey) do {            \
 48         mm_pkey_allocation_map(mm) |= (1U << pkey);     \
 49 } while (0)
 50 #define mm_set_pkey_free(mm, pkey) do {                 \
 51         mm_pkey_allocation_map(mm) &= ~(1U << pkey);    \
 52 } while (0)
 53 
 54 static inline
 55 bool mm_pkey_is_allocated(struct mm_struct *mm, int pkey)
 56 {
 57         /*
 58          * "Allocated" pkeys are those that have been returned
 59          * from pkey_alloc() or pkey 0 which is allocated
 60          * implicitly when the mm is created.
 61          */
 62         if (pkey < 0)
 63                 return false;
 64         if (pkey >= arch_max_pkey())
 65                 return false;
 66         /*
 67          * The exec-only pkey is set in the allocation map, but
 68          * is not available to any of the user interfaces like
 69          * mprotect_pkey().
 70          */
 71         if (pkey == mm->context.execute_only_pkey)
 72                 return false;
 73 
 74         return mm_pkey_allocation_map(mm) & (1U << pkey);
 75 }
 76 
 77 /*
 78  * Returns a positive, 4-bit key on success, or -1 on failure.
 79  */
 80 static inline
 81 int mm_pkey_alloc(struct mm_struct *mm)
 82 {
 83         /*
 84          * Note: this is the one and only place we make sure
 85          * that the pkey is valid as far as the hardware is
 86          * concerned.  The rest of the kernel trusts that
 87          * only good, valid pkeys come out of here.
 88          */
 89         u16 all_pkeys_mask = ((1U << arch_max_pkey()) - 1);
 90         int ret;
 91 
 92         /*
 93          * Are we out of pkeys?  We must handle this specially
 94          * because ffz() behavior is undefined if there are no
 95          * zeros.
 96          */
 97         if (mm_pkey_allocation_map(mm) == all_pkeys_mask)
 98                 return -1;
 99 
100         ret = ffz(mm_pkey_allocation_map(mm));
101 
102         mm_set_pkey_allocated(mm, ret);
103 
104         return ret;
105 }
106 
107 static inline
108 int mm_pkey_free(struct mm_struct *mm, int pkey)
109 {
110         if (!mm_pkey_is_allocated(mm, pkey))
111                 return -EINVAL;
112 
113         mm_set_pkey_free(mm, pkey);
114 
115         return 0;
116 }
117 
118 extern int arch_set_user_pkey_access(struct task_struct *tsk, int pkey,
119                 unsigned long init_val);
120 extern int __arch_set_user_pkey_access(struct task_struct *tsk, int pkey,
121                 unsigned long init_val);
122 extern void copy_init_pkru_to_fpregs(void);
123 
124 static inline int vma_pkey(struct vm_area_struct *vma)
125 {
126         unsigned long vma_pkey_mask = VM_PKEY_BIT0 | VM_PKEY_BIT1 |
127                                       VM_PKEY_BIT2 | VM_PKEY_BIT3;
128 
129         return (vma->vm_flags & vma_pkey_mask) >> VM_PKEY_SHIFT;
130 }
131 
132 #endif /*_ASM_X86_PKEYS_H */
133 

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