diff options
Diffstat (limited to 'arch/powerpc/kernel/vdso.c')
| -rw-r--r-- | arch/powerpc/kernel/vdso.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/vdso.c b/arch/powerpc/kernel/vdso.c index 67fb4c7e504c..2b975759a04d 100644 --- a/arch/powerpc/kernel/vdso.c +++ b/arch/powerpc/kernel/vdso.c @@ -115,13 +115,37 @@ struct lib64_elfinfo unsigned long text; }; +static int vdso_mremap(const struct vm_special_mapping *sm, struct vm_area_struct *new_vma, + unsigned long text_size) +{ + unsigned long new_size = new_vma->vm_end - new_vma->vm_start; + + if (new_size != text_size + PAGE_SIZE) + return -EINVAL; + + current->mm->context.vdso_base = new_vma->vm_start; + + return 0; +} + +static int vdso32_mremap(const struct vm_special_mapping *sm, struct vm_area_struct *new_vma) +{ + return vdso_mremap(sm, new_vma, &vdso32_end - &vdso32_start); +} + +static int vdso64_mremap(const struct vm_special_mapping *sm, struct vm_area_struct *new_vma) +{ + return vdso_mremap(sm, new_vma, &vdso64_end - &vdso64_start); +} static struct vm_special_mapping vdso32_spec __ro_after_init = { .name = "[vdso]", + .mremap = vdso32_mremap, }; static struct vm_special_mapping vdso64_spec __ro_after_init = { .name = "[vdso]", + .mremap = vdso64_mremap, }; /* |