mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2026-05-27 18:22:28 -04:00
49ccf2c3ca
The commit5de195060b("mm: resolve faulty mmap_region() error path behaviour") moved vm flags validation before fop->mmap for file mappings. But when commit25c17c4b55("hugetlb: arm64: add mte support") was rebased on top of it, the hugetlbfs part was missed. Mmapping hugetlbfs file may not have MAP_HUGETLB set. Fixes:25c17c4b55("hugetlb: arm64: add mte support") Signed-off-by: Yang Shi <yang@os.amperecomputing.com> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Link: https://lore.kernel.org/r/20241119200914.1145249-1-yang@os.amperecomputing.com Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
99 lines
2.4 KiB
C
99 lines
2.4 KiB
C
/* 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/hugetlb.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) || is_file_hugepages(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__ */
|