forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
89 lines
2.0 KiB
89 lines
2.0 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* |
|
* Copyright (c) 2014, The Linux Foundation. All rights reserved. |
|
*/ |
|
#include <linux/mm.h> |
|
#include <linux/module.h> |
|
|
|
#include <asm/tlbflush.h> |
|
#include <asm/set_memory.h> |
|
|
|
struct page_change_data { |
|
pgprot_t set_mask; |
|
pgprot_t clear_mask; |
|
}; |
|
|
|
static int change_page_range(pte_t *ptep, unsigned long addr, void *data) |
|
{ |
|
struct page_change_data *cdata = data; |
|
pte_t pte = *ptep; |
|
|
|
pte = clear_pte_bit(pte, cdata->clear_mask); |
|
pte = set_pte_bit(pte, cdata->set_mask); |
|
|
|
set_pte_ext(ptep, pte, 0); |
|
return 0; |
|
} |
|
|
|
static bool in_range(unsigned long start, unsigned long size, |
|
unsigned long range_start, unsigned long range_end) |
|
{ |
|
return start >= range_start && start < range_end && |
|
size <= range_end - start; |
|
} |
|
|
|
static int change_memory_common(unsigned long addr, int numpages, |
|
pgprot_t set_mask, pgprot_t clear_mask) |
|
{ |
|
unsigned long start = addr & PAGE_MASK; |
|
unsigned long end = PAGE_ALIGN(addr) + numpages * PAGE_SIZE; |
|
unsigned long size = end - start; |
|
int ret; |
|
struct page_change_data data; |
|
|
|
WARN_ON_ONCE(start != addr); |
|
|
|
if (!size) |
|
return 0; |
|
|
|
if (!in_range(start, size, MODULES_VADDR, MODULES_END) && |
|
!in_range(start, size, VMALLOC_START, VMALLOC_END)) |
|
return -EINVAL; |
|
|
|
data.set_mask = set_mask; |
|
data.clear_mask = clear_mask; |
|
|
|
ret = apply_to_page_range(&init_mm, start, size, change_page_range, |
|
&data); |
|
|
|
flush_tlb_kernel_range(start, end); |
|
return ret; |
|
} |
|
|
|
int set_memory_ro(unsigned long addr, int numpages) |
|
{ |
|
return change_memory_common(addr, numpages, |
|
__pgprot(L_PTE_RDONLY), |
|
__pgprot(0)); |
|
} |
|
|
|
int set_memory_rw(unsigned long addr, int numpages) |
|
{ |
|
return change_memory_common(addr, numpages, |
|
__pgprot(0), |
|
__pgprot(L_PTE_RDONLY)); |
|
} |
|
|
|
int set_memory_nx(unsigned long addr, int numpages) |
|
{ |
|
return change_memory_common(addr, numpages, |
|
__pgprot(L_PTE_XN), |
|
__pgprot(0)); |
|
} |
|
|
|
int set_memory_x(unsigned long addr, int numpages) |
|
{ |
|
return change_memory_common(addr, numpages, |
|
__pgprot(0), |
|
__pgprot(L_PTE_XN)); |
|
}
|
|
|