diff options
| -rw-r--r-- | arch/arm/kernel/process.c | 8 | ||||
| -rw-r--r-- | arch/arm/kernel/vdso.c | 18 | ||||
| -rw-r--r-- | arch/x86/entry/vdso/vma.c | 3 | ||||
| -rw-r--r-- | mm/mmap.c | 4 |
4 files changed, 30 insertions, 3 deletions
diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c index 151cece4a293..d96714e1858c 100644 --- a/arch/arm/kernel/process.c +++ b/arch/arm/kernel/process.c @@ -404,9 +404,17 @@ static unsigned long sigpage_addr(const struct mm_struct *mm, static struct page *signal_page; extern struct page *get_signal_page(void); +static int sigpage_mremap(const struct vm_special_mapping *sm, + struct vm_area_struct *new_vma) +{ + current->mm->context.sigpage = new_vma->vm_start; + return 0; +} + static const struct vm_special_mapping sigpage_mapping = { .name = "[sigpage]", .pages = &signal_page, + .mremap = sigpage_mremap, }; int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp) 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 { diff --git a/arch/x86/entry/vdso/vma.c b/arch/x86/entry/vdso/vma.c index 139ad7726e10..726355ce8497 100644 --- a/arch/x86/entry/vdso/vma.c +++ b/arch/x86/entry/vdso/vma.c @@ -78,9 +78,6 @@ static int vdso_mremap(const struct vm_special_mapping *sm, if (image->size != new_size) return -EINVAL; - if (WARN_ON_ONCE(current->mm != new_vma->vm_mm)) - return -EFAULT; - vdso_fix_landing(image, new_vma); current->mm->context.vdso = (void __user *)new_vma->vm_start; diff --git a/mm/mmap.c b/mm/mmap.c index f82741e199c0..c0a8bf1df665 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -3152,8 +3152,12 @@ static int special_mapping_mremap(struct vm_area_struct *new_vma) { struct vm_special_mapping *sm = new_vma->vm_private_data; + if (WARN_ON_ONCE(current->mm != new_vma->vm_mm)) + return -EFAULT; + if (sm->mremap) return sm->mremap(sm, new_vma); + return 0; } |