mman.h (9f3419315f3cdc41a7318e4d50ba18a592b30c8c) mman.h (0042090548740921951f31fc0c20dcdb96638cb0)
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __ASM_MMAN_H__
3#define __ASM_MMAN_H__
4
5#include <linux/compiler.h>
6#include <linux/types.h>
7#include <uapi/asm/mman.h>
8

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44
45 /*
46 * There are two conditions required for returning a Normal Tagged
47 * memory type: (1) the user requested it via PROT_MTE passed to
48 * mmap() or mprotect() and (2) the corresponding vma supports MTE. We
49 * register (1) as VM_MTE in the vma->vm_flags and (2) as
50 * VM_MTE_ALLOWED. Note that the latter can only be set during the
51 * mmap() call since mprotect() does not accept MAP_* flags.
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __ASM_MMAN_H__
3#define __ASM_MMAN_H__
4
5#include <linux/compiler.h>
6#include <linux/types.h>
7#include <uapi/asm/mman.h>
8

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44
45 /*
46 * There are two conditions required for returning a Normal Tagged
47 * memory type: (1) the user requested it via PROT_MTE passed to
48 * mmap() or mprotect() and (2) the corresponding vma supports MTE. We
49 * register (1) as VM_MTE in the vma->vm_flags and (2) as
50 * VM_MTE_ALLOWED. Note that the latter can only be set during the
51 * mmap() call since mprotect() does not accept MAP_* flags.
52 * Checking for VM_MTE only is sufficient since arch_validate_flags()
53 * does not permit (VM_MTE & !VM_MTE_ALLOWED).
52 */
54 */
53 if ((vm_flags & VM_MTE) && (vm_flags & VM_MTE_ALLOWED))
55 if (vm_flags & VM_MTE)
54 prot |= PTE_ATTRINDX(MT_NORMAL_TAGGED);
55
56 return __pgprot(prot);
57}
58#define arch_vm_get_page_prot(vm_flags) arch_vm_get_page_prot(vm_flags)
59
60static inline bool arch_validate_prot(unsigned long prot,
61 unsigned long addr __always_unused)

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67
68 if (system_supports_mte())
69 supported |= PROT_MTE;
70
71 return (prot & ~supported) == 0;
72}
73#define arch_validate_prot(prot, addr) arch_validate_prot(prot, addr)
74
56 prot |= PTE_ATTRINDX(MT_NORMAL_TAGGED);
57
58 return __pgprot(prot);
59}
60#define arch_vm_get_page_prot(vm_flags) arch_vm_get_page_prot(vm_flags)
61
62static inline bool arch_validate_prot(unsigned long prot,
63 unsigned long addr __always_unused)

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69
70 if (system_supports_mte())
71 supported |= PROT_MTE;
72
73 return (prot & ~supported) == 0;
74}
75#define arch_validate_prot(prot, addr) arch_validate_prot(prot, addr)
76
77static inline bool arch_validate_flags(unsigned long vm_flags)
78{
79 if (!system_supports_mte())
80 return true;
81
82 /* only allow VM_MTE if VM_MTE_ALLOWED has been set previously */
83 return !(vm_flags & VM_MTE) || (vm_flags & VM_MTE_ALLOWED);
84}
85#define arch_validate_flags(vm_flags) arch_validate_flags(vm_flags)
86
75#endif /* ! __ASM_MMAN_H__ */
87#endif /* ! __ASM_MMAN_H__ */