diff options
Diffstat (limited to 'arch/arm64/include/asm/mman.h')
| -rw-r--r-- | arch/arm64/include/asm/mman.h | 77 |
1 files changed, 69 insertions, 8 deletions
diff --git a/arch/arm64/include/asm/mman.h b/arch/arm64/include/asm/mman.h index 081ec8de9ea6..8770c7ee759f 100644 --- a/arch/arm64/include/asm/mman.h +++ b/arch/arm64/include/asm/mman.h @@ -2,25 +2,56 @@ #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/hugetlb.h> +#include <linux/shmem_fs.h> #include <linux/types.h> -#include <uapi/asm/mman.h> -static inline unsigned long arch_calc_vm_prot_bits(unsigned long prot, - unsigned long pkey __always_unused) +static inline vm_flags_t arch_calc_vm_prot_bits(unsigned long prot, + unsigned long pkey) { + vm_flags_t ret = 0; + if (system_supports_bti() && (prot & PROT_BTI)) - return VM_ARM64_BTI; + ret |= VM_ARM64_BTI; - return 0; + 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 pgprot_t arch_vm_get_page_prot(unsigned long vm_flags) +static inline vm_flags_t arch_calc_vm_flag_bits(struct file *file, + unsigned long flags) { - return (vm_flags & VM_ARM64_BTI) ? __pgprot(PTE_GP) : __pgprot(0); + /* + * 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) || is_file_hugepages(file)) + return VM_MTE_ALLOWED; + } + + return 0; } -#define arch_vm_get_page_prot(vm_flags) arch_vm_get_page_prot(vm_flags) +#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) @@ -30,8 +61,38 @@ static inline bool arch_validate_prot(unsigned long prot, 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(vm_flags_t 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__ */ |