linux-master/fs/exec.c

14  * "current->executable", and page faults do the actual loading. Clean.
199 static struct page *get_arg_page(struct linux_binprm *bprm, unsigned long pos,
202 	struct page *page;
229 			&page, NULL);
237 	return page;
240 static void put_arg_page(struct page *page)
242 	put_page(page);
250 		struct page *page)
252 	flush_cache_page(bprm->vma, pos, page_to_pfn(page));
320 static struct page *get_arg_page(struct linux_binprm *bprm, unsigned long pos,
323 	struct page *page;
325 	page = bprm->page[pos / PAGE_SIZE];
326 	if (!page && write) {
327 		page = alloc_page(GFP_HIGHUSER|__GFP_ZERO);
328 		if (!page)
330 		bprm->page[pos / PAGE_SIZE] = page;
333 	return page;
336 static void put_arg_page(struct page *page)
342 	if (bprm->page[i]) {
343 		__free_page(bprm->page[i]);
344 		bprm->page[i] = NULL;
357 		struct page *page)
533  * ensures the destination page is created and not swapped out.
538 	struct page *kmapped_page = NULL;
593 				struct page *page;
595 				page = get_arg_page(bprm, pos, 1);
596 				if (!page) {
606 				kmapped_page = page;
649 		struct page *page;
655 		page = get_arg_page(bprm, pos, 1);
656 		if (!page)
658 		flush_arg_page(bprm, pos & PAGE_MASK, page);
659 		memcpy_to_page(page, offset_in_page(pos), arg, bytes_to_copy);
660 		put_arg_page(page);
691  * 3) Move vma's page tables to the new range.
724 	 * move the page tables downwards, on failure we rely on
860 	 * Align this down to a page boundary as expand_stack
900 		char *src = kmap_local_page(bprm->page[index]) + offset;
1744 	struct page *page;
1751 		page = get_arg_page(bprm, bprm->p, 0);
1752 		if (!page)
1754 		kaddr = kmap_local_page(page);
1761 		put_arg_page(page);