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137 lines
3.5 KiB
137 lines
3.5 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _ASM_X86_PKEYS_H |
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#define _ASM_X86_PKEYS_H |
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#define ARCH_DEFAULT_PKEY 0 |
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/* |
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* If more than 16 keys are ever supported, a thorough audit |
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* will be necessary to ensure that the types that store key |
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* numbers and masks have sufficient capacity. |
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*/ |
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#define arch_max_pkey() (boot_cpu_has(X86_FEATURE_OSPKE) ? 16 : 1) |
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extern int arch_set_user_pkey_access(struct task_struct *tsk, int pkey, |
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unsigned long init_val); |
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static inline bool arch_pkeys_enabled(void) |
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{ |
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return boot_cpu_has(X86_FEATURE_OSPKE); |
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} |
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/* |
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* Try to dedicate one of the protection keys to be used as an |
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* execute-only protection key. |
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*/ |
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extern int __execute_only_pkey(struct mm_struct *mm); |
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static inline int execute_only_pkey(struct mm_struct *mm) |
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{ |
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if (!boot_cpu_has(X86_FEATURE_OSPKE)) |
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return ARCH_DEFAULT_PKEY; |
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return __execute_only_pkey(mm); |
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} |
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extern int __arch_override_mprotect_pkey(struct vm_area_struct *vma, |
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int prot, int pkey); |
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static inline int arch_override_mprotect_pkey(struct vm_area_struct *vma, |
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int prot, int pkey) |
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{ |
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if (!boot_cpu_has(X86_FEATURE_OSPKE)) |
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return 0; |
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return __arch_override_mprotect_pkey(vma, prot, pkey); |
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} |
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extern int __arch_set_user_pkey_access(struct task_struct *tsk, int pkey, |
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unsigned long init_val); |
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#define ARCH_VM_PKEY_FLAGS (VM_PKEY_BIT0 | VM_PKEY_BIT1 | VM_PKEY_BIT2 | VM_PKEY_BIT3) |
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#define mm_pkey_allocation_map(mm) (mm->context.pkey_allocation_map) |
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#define mm_set_pkey_allocated(mm, pkey) do { \ |
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mm_pkey_allocation_map(mm) |= (1U << pkey); \ |
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} while (0) |
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#define mm_set_pkey_free(mm, pkey) do { \ |
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mm_pkey_allocation_map(mm) &= ~(1U << pkey); \ |
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} while (0) |
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static inline |
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bool mm_pkey_is_allocated(struct mm_struct *mm, int pkey) |
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{ |
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/* |
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* "Allocated" pkeys are those that have been returned |
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* from pkey_alloc() or pkey 0 which is allocated |
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* implicitly when the mm is created. |
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*/ |
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if (pkey < 0) |
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return false; |
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if (pkey >= arch_max_pkey()) |
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return false; |
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/* |
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* The exec-only pkey is set in the allocation map, but |
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* is not available to any of the user interfaces like |
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* mprotect_pkey(). |
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*/ |
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if (pkey == mm->context.execute_only_pkey) |
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return false; |
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return mm_pkey_allocation_map(mm) & (1U << pkey); |
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} |
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/* |
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* Returns a positive, 4-bit key on success, or -1 on failure. |
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*/ |
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static inline |
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int mm_pkey_alloc(struct mm_struct *mm) |
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{ |
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/* |
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* Note: this is the one and only place we make sure |
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* that the pkey is valid as far as the hardware is |
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* concerned. The rest of the kernel trusts that |
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* only good, valid pkeys come out of here. |
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*/ |
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u16 all_pkeys_mask = ((1U << arch_max_pkey()) - 1); |
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int ret; |
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/* |
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* Are we out of pkeys? We must handle this specially |
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* because ffz() behavior is undefined if there are no |
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* zeros. |
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*/ |
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if (mm_pkey_allocation_map(mm) == all_pkeys_mask) |
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return -1; |
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ret = ffz(mm_pkey_allocation_map(mm)); |
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mm_set_pkey_allocated(mm, ret); |
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return ret; |
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} |
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static inline |
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int mm_pkey_free(struct mm_struct *mm, int pkey) |
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{ |
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if (!mm_pkey_is_allocated(mm, pkey)) |
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return -EINVAL; |
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mm_set_pkey_free(mm, pkey); |
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return 0; |
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} |
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extern int arch_set_user_pkey_access(struct task_struct *tsk, int pkey, |
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unsigned long init_val); |
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extern int __arch_set_user_pkey_access(struct task_struct *tsk, int pkey, |
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unsigned long init_val); |
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extern void copy_init_pkru_to_fpregs(void); |
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static inline int vma_pkey(struct vm_area_struct *vma) |
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{ |
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unsigned long vma_pkey_mask = VM_PKEY_BIT0 | VM_PKEY_BIT1 | |
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VM_PKEY_BIT2 | VM_PKEY_BIT3; |
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return (vma->vm_flags & vma_pkey_mask) >> VM_PKEY_SHIFT; |
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} |
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#endif /*_ASM_X86_PKEYS_H */
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