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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __ASM_MMAN_H__
#define __ASM_MMAN_H__
#include <uapi/asm/mman.h>
#ifndef BUILD_VDSO
#include <linux/compiler.h>
#include <linux/fs.h>
#include <linux/shmem_fs.h>
#include <linux/types.h>
static inline unsigned long arch_calc_vm_prot_bits(unsigned long prot,
unsigned long pkey)
{
unsigned long ret = 0;
if (system_supports_bti() && (prot & PROT_BTI))
ret |= VM_ARM64_BTI;
if (system_supports_mte() && (prot & PROT_MTE))
ret |= VM_MTE;
#ifdef CONFIG_ARCH_HAS_PKEYS
if (system_supports_poe()) {
ret |= pkey & BIT(0) ? VM_PKEY_BIT0 : 0;
ret |= pkey & BIT(1) ? VM_PKEY_BIT1 : 0;
ret |= pkey & BIT(2) ? VM_PKEY_BIT2 : 0;
}
#endif
return ret;
}
#define arch_calc_vm_prot_bits(prot, pkey) arch_calc_vm_prot_bits(prot, pkey)
static inline unsigned long arch_calc_vm_flag_bits(struct file *file,
unsigned long flags)
{
/*
* Only allow MTE on anonymous mappings as these are guaranteed to be
* backed by tags-capable memory. The vm_flags may be overridden by a
* filesystem supporting MTE (RAM-based).
*/
if (system_supports_mte()) {
if (flags & (MAP_ANONYMOUS | MAP_HUGETLB))
return VM_MTE_ALLOWED;
if (shmem_file(file))
return VM_MTE_ALLOWED;
}
return 0;
}
#define arch_calc_vm_flag_bits(file, flags) arch_calc_vm_flag_bits(file, flags)
static inline bool arch_validate_prot(unsigned long prot,
unsigned long addr __always_unused)
{
unsigned long supported = PROT_READ | PROT_WRITE | PROT_EXEC | PROT_SEM;
if (system_supports_bti())
supported |= PROT_BTI;
if (system_supports_mte())
supported |= PROT_MTE;
return (prot & ~supported) == 0;
}
#define arch_validate_prot(prot, addr) arch_validate_prot(prot, addr)
static inline bool arch_validate_flags(unsigned long vm_flags)
{
if (system_supports_mte()) {
/*
* only allow VM_MTE if VM_MTE_ALLOWED has been set
* previously
*/
if ((vm_flags & VM_MTE) && !(vm_flags & VM_MTE_ALLOWED))
return false;
}
if (system_supports_gcs() && (vm_flags & VM_SHADOW_STACK)) {
/* An executable GCS isn't a good idea. */
if (vm_flags & VM_EXEC)
return false;
/* The memory management core should prevent this */
VM_WARN_ON(vm_flags & VM_SHARED);
}
return true;
}
#define arch_validate_flags(vm_flags) arch_validate_flags(vm_flags)
#endif /* !BUILD_VDSO */
#endif /* ! __ASM_MMAN_H__ */
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