diff options
Diffstat (limited to 'arch/arm/kernel/vdso.c')
| -rw-r--r-- | arch/arm/kernel/vdso.c | 18 |
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 { |