From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- arch/arm64/include/asm/mman.h | 63 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 63 insertions(+) create mode 100644 arch/arm64/include/asm/mman.h (limited to 'arch/arm64/include/asm/mman.h') diff --git a/arch/arm64/include/asm/mman.h b/arch/arm64/include/asm/mman.h new file mode 100644 index 000000000..5966ee4a6 --- /dev/null +++ b/arch/arm64/include/asm/mman.h @@ -0,0 +1,63 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __ASM_MMAN_H__ +#define __ASM_MMAN_H__ + +#include +#include +#include + +static inline unsigned long arch_calc_vm_prot_bits(unsigned long prot, + unsigned long pkey __always_unused) +{ + 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; + + 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(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() && (flags & MAP_ANONYMOUS)) + return VM_MTE_ALLOWED; + + return 0; +} +#define arch_calc_vm_flag_bits(flags) arch_calc_vm_flag_bits(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()) + return true; + + /* only allow VM_MTE if VM_MTE_ALLOWED has been set previously */ + return !(vm_flags & VM_MTE) || (vm_flags & VM_MTE_ALLOWED); +} +#define arch_validate_flags(vm_flags) arch_validate_flags(vm_flags) + +#endif /* ! __ASM_MMAN_H__ */ -- cgit v1.2.3