diff options
Diffstat (limited to '')
| -rw-r--r-- | arch/arm64/include/asm/mman.h | 33 |
1 files changed, 26 insertions, 7 deletions
diff --git a/arch/arm64/include/asm/mman.h b/arch/arm64/include/asm/mman.h index 798d965760d4..21df8bbd2668 100644 --- a/arch/arm64/include/asm/mman.h +++ b/arch/arm64/include/asm/mman.h @@ -7,6 +7,7 @@ #ifndef BUILD_VDSO #include <linux/compiler.h> #include <linux/fs.h> +#include <linux/hugetlb.h> #include <linux/shmem_fs.h> #include <linux/types.h> @@ -41,9 +42,12 @@ static inline unsigned long arch_calc_vm_flag_bits(struct file *file, * 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) || shmem_file(file))) - return VM_MTE_ALLOWED; + 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; } @@ -66,11 +70,26 @@ static inline bool arch_validate_prot(unsigned long prot, static inline bool arch_validate_flags(unsigned long vm_flags) { - if (!system_supports_mte()) - return true; + 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; - /* 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) |