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| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
|---|---|
| 2 | #ifndef __ASM_MMAN_H__ |
| 3 | #define __ASM_MMAN_H__ |
| 4 | |
| 5 | #include <uapi/asm/mman.h> |
| 6 | |
| 7 | #ifndef BUILD_VDSO |
| 8 | #include <linux/compiler.h> |
| 9 | #include <linux/fs.h> |
| 10 | #include <linux/hugetlb.h> |
| 11 | #include <linux/shmem_fs.h> |
| 12 | #include <linux/types.h> |
| 13 | |
| 14 | static inline vm_flags_t arch_calc_vm_prot_bits(unsigned long prot, |
| 15 | unsigned long pkey) |
| 16 | { |
| 17 | vm_flags_t ret = 0; |
| 18 | |
| 19 | if (system_supports_bti() && (prot & PROT_BTI)) |
| 20 | ret |= VM_ARM64_BTI; |
| 21 | |
| 22 | if (system_supports_mte() && (prot & PROT_MTE)) |
| 23 | ret |= VM_MTE; |
| 24 | |
| 25 | #ifdef CONFIG_ARCH_HAS_PKEYS |
| 26 | if (system_supports_poe()) { |
| 27 | ret |= pkey & BIT(0) ? VM_PKEY_BIT0 : 0; |
| 28 | ret |= pkey & BIT(1) ? VM_PKEY_BIT1 : 0; |
| 29 | ret |= pkey & BIT(2) ? VM_PKEY_BIT2 : 0; |
| 30 | } |
| 31 | #endif |
| 32 | |
| 33 | return ret; |
| 34 | } |
| 35 | #define arch_calc_vm_prot_bits(prot, pkey) arch_calc_vm_prot_bits(prot, pkey) |
| 36 | |
| 37 | static inline vm_flags_t arch_calc_vm_flag_bits(struct file *file, |
| 38 | unsigned long flags) |
| 39 | { |
| 40 | /* |
| 41 | * Only allow MTE on anonymous mappings as these are guaranteed to be |
| 42 | * backed by tags-capable memory. The vm_flags may be overridden by a |
| 43 | * filesystem supporting MTE (RAM-based). |
| 44 | */ |
| 45 | if (system_supports_mte()) { |
| 46 | if (flags & (MAP_ANONYMOUS | MAP_HUGETLB)) |
| 47 | return VM_MTE_ALLOWED; |
| 48 | if (shmem_file(file) || is_file_hugepages(file)) |
| 49 | return VM_MTE_ALLOWED; |
| 50 | } |
| 51 | |
| 52 | return 0; |
| 53 | } |
| 54 | #define arch_calc_vm_flag_bits(file, flags) arch_calc_vm_flag_bits(file, flags) |
| 55 | |
| 56 | static inline bool arch_validate_prot(unsigned long prot, |
| 57 | unsigned long addr __always_unused) |
| 58 | { |
| 59 | unsigned long supported = PROT_READ | PROT_WRITE | PROT_EXEC | PROT_SEM; |
| 60 | |
| 61 | if (system_supports_bti()) |
| 62 | supported |= PROT_BTI; |
| 63 | |
| 64 | if (system_supports_mte()) |
| 65 | supported |= PROT_MTE; |
| 66 | |
| 67 | return (prot & ~supported) == 0; |
| 68 | } |
| 69 | #define arch_validate_prot(prot, addr) arch_validate_prot(prot, addr) |
| 70 | |
| 71 | static inline bool arch_validate_flags(vm_flags_t vm_flags) |
| 72 | { |
| 73 | if (system_supports_mte()) { |
| 74 | /* |
| 75 | * only allow VM_MTE if VM_MTE_ALLOWED has been set |
| 76 | * previously |
| 77 | */ |
| 78 | if ((vm_flags & VM_MTE) && !(vm_flags & VM_MTE_ALLOWED)) |
| 79 | return false; |
| 80 | } |
| 81 | |
| 82 | if (system_supports_gcs() && (vm_flags & VM_SHADOW_STACK)) { |
| 83 | /* An executable GCS isn't a good idea. */ |
| 84 | if (vm_flags & VM_EXEC) |
| 85 | return false; |
| 86 | |
| 87 | /* The memory management core should prevent this */ |
| 88 | VM_WARN_ON(vm_flags & VM_SHARED); |
| 89 | } |
| 90 | |
| 91 | return true; |
| 92 | |
| 93 | } |
| 94 | #define arch_validate_flags(vm_flags) arch_validate_flags(vm_flags) |
| 95 | |
| 96 | #endif /* !BUILD_VDSO */ |
| 97 | |
| 98 | #endif /* ! __ASM_MMAN_H__ */ |
| 99 |
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