summaryrefslogtreecommitdiffstats
path: root/arch/arm64/mm/pageattr.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm64/mm/pageattr.c')
-rw-r--r--arch/arm64/mm/pageattr.c21
1 files changed, 21 insertions, 0 deletions
diff --git a/arch/arm64/mm/pageattr.c b/arch/arm64/mm/pageattr.c
index a56359373d8b..6cd645edcf35 100644
--- a/arch/arm64/mm/pageattr.c
+++ b/arch/arm64/mm/pageattr.c
@@ -25,6 +25,8 @@ struct page_change_data {
pgprot_t clear_mask;
};
+bool rodata_full __ro_after_init = IS_ENABLED(CONFIG_RODATA_FULL_DEFAULT_ENABLED);
+
static int change_page_range(pte_t *ptep, pgtable_t token, unsigned long addr,
void *data)
{
@@ -64,6 +66,7 @@ static int change_memory_common(unsigned long addr, int numpages,
unsigned long size = PAGE_SIZE*numpages;
unsigned long end = start + size;
struct vm_struct *area;
+ int i;
if (!PAGE_ALIGNED(addr)) {
start &= PAGE_MASK;
@@ -93,6 +96,24 @@ static int change_memory_common(unsigned long addr, int numpages,
if (!numpages)
return 0;
+ /*
+ * If we are manipulating read-only permissions, apply the same
+ * change to the linear mapping of the pages that back this VM area.
+ */
+ if (rodata_full && (pgprot_val(set_mask) == PTE_RDONLY ||
+ pgprot_val(clear_mask) == PTE_RDONLY)) {
+ for (i = 0; i < area->nr_pages; i++) {
+ __change_memory_common((u64)page_address(area->pages[i]),
+ PAGE_SIZE, set_mask, clear_mask);
+ }
+ }
+
+ /*
+ * Get rid of potentially aliasing lazily unmapped vm areas that may
+ * have permissions set that deviate from the ones we are setting here.
+ */
+ vm_unmap_aliases();
+
return __change_memory_common(start, size, set_mask, clear_mask);
}