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Diffstat (limited to 'arch/arm/kernel/vdso.c')
-rw-r--r--arch/arm/kernel/vdso.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/arch/arm/kernel/vdso.c b/arch/arm/kernel/vdso.c
index 53cf86cf2d1a..a4d6dc0f2427 100644
--- a/arch/arm/kernel/vdso.c
+++ b/arch/arm/kernel/vdso.c
@@ -54,8 +54,26 @@ static const struct vm_special_mapping vdso_data_mapping = {
.pages = &vdso_data_page,
};
+static int vdso_mremap(const struct vm_special_mapping *sm,
+ struct vm_area_struct *new_vma)
+{
+ unsigned long new_size = new_vma->vm_end - new_vma->vm_start;
+ unsigned long vdso_size;
+
+ /* without VVAR page */
+ vdso_size = (vdso_total_pages - 1) << PAGE_SHIFT;
+
+ if (vdso_size != new_size)
+ return -EINVAL;
+
+ current->mm->context.vdso = new_vma->vm_start;
+
+ return 0;
+}
+
static struct vm_special_mapping vdso_text_mapping __ro_after_init = {
.name = "[vdso]",
+ .mremap = vdso_mremap,
};
struct elfinfo {