diff --git a/arch/x86/um/vdso/vma.c b/arch/x86/um/vdso/vma.c index 51a2b9f2eca9..8e1f5ee44f4e 100644 --- a/arch/x86/um/vdso/vma.c +++ b/arch/x86/um/vdso/vma.c @@ -9,6 +9,7 @@ #include #include #include +#include unsigned long um_vdso_addr; static struct page *um_vdso; @@ -20,18 +21,25 @@ static int __init init_vdso(void) { BUG_ON(vdso_end - vdso_start > PAGE_SIZE); - um_vdso_addr = task_size - PAGE_SIZE; - um_vdso = alloc_page(GFP_KERNEL); if (!um_vdso) panic("Cannot allocate vdso\n"); copy_page(page_address(um_vdso), vdso_start); +#ifdef CONFIG_MMU + um_vdso_addr = task_size - PAGE_SIZE; +#else + /* this is fine with NOMMU as everything is accessible */ + um_vdso_addr = (unsigned long)page_address(um_vdso); + os_protect_memory((void *)um_vdso_addr, vdso_end - vdso_start, 1, 0, 1); +#endif + return 0; } subsys_initcall(init_vdso); +#ifdef CONFIG_MMU int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp) { struct vm_area_struct *vma; @@ -53,3 +61,4 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp) return IS_ERR(vma) ? PTR_ERR(vma) : 0; } +#endif /* CONFIG_MMU */