C++ (Cpp) put_dirty_page Examples

Example #1

File: svr3.c Project: shattered/linux-m68k

/*  We don`t use ordinary `setup_arg_pages()' because
   svr3 has another stack start address.
*/
static unsigned long svr3_setup_arg_pages (unsigned long p,
						struct linux_binprm * bprm) {
	unsigned long stack_base;
	struct vm_area_struct *mpnt;
	int i;

	stack_base = SVR3_STACK_TOP - MAX_ARG_PAGES*PAGE_SIZE;

	p += stack_base;

	mpnt = (struct vm_area_struct *) kmalloc (sizeof (*mpnt), GFP_KERNEL);
	if (mpnt) {
		mpnt->vm_mm = current->mm;
		mpnt->vm_start = PAGE_MASK & (unsigned long) p;
		mpnt->vm_end = SVR3_STACK_TOP;
		mpnt->vm_page_prot = PAGE_COPY;
		mpnt->vm_flags = VM_STACK_FLAGS;
		mpnt->vm_ops = NULL;
		mpnt->vm_offset = 0;
		mpnt->vm_inode = NULL;
		mpnt->vm_pte = 0;
		insert_vm_struct (current->mm, mpnt);
		current->mm->total_vm =
			(mpnt->vm_end - mpnt->vm_start) >> PAGE_SHIFT;
	}

	for (i = 0 ; i < MAX_ARG_PAGES ; i++) {
		if (bprm->page[i]) {
			current->mm->rss++;
			put_dirty_page(current,bprm->page[i],stack_base);
		}
		stack_base += PAGE_SIZE;
	}
	return p;
}

Example #2

File: ia32_binfmt.c Project: ProjectZeroSlackr/linux-2.4.32-ipod

int ia32_setup_arg_pages(struct linux_binprm *bprm)
{
	unsigned long stack_base;
	struct vm_area_struct *mpnt;
	int i, ret;

	stack_base = IA32_STACK_TOP - MAX_ARG_PAGES*PAGE_SIZE;

	bprm->p += stack_base;
	if (bprm->loader)
		bprm->loader += stack_base;
	bprm->exec += stack_base;

	mpnt = kmem_cache_alloc(vm_area_cachep, SLAB_KERNEL);
	if (!mpnt) 
		return -ENOMEM; 
	
	down_write(&current->mm->mmap_sem);
	{
		mpnt->vm_mm = current->mm;
		mpnt->vm_start = PAGE_MASK & (unsigned long) bprm->p;
		mpnt->vm_end = IA32_STACK_TOP;
		mpnt->vm_flags = vm_stack_flags32; 
		mpnt->vm_page_prot = (mpnt->vm_flags & VM_EXEC) ? 
			PAGE_COPY_EXEC : PAGE_COPY;
		mpnt->vm_ops = NULL;
		mpnt->vm_pgoff = 0;
		mpnt->vm_file = NULL;
		mpnt->vm_private_data = (void *) 0;
		if ((ret = insert_vm_struct(current->mm, mpnt))) {
			up_write(&current->mm->mmap_sem);
			kmem_cache_free(vm_area_cachep, mpnt);
			return ret;
		}
		current->mm->total_vm = (mpnt->vm_end - mpnt->vm_start) >> PAGE_SHIFT;
	} 

	for (i = 0 ; i < MAX_ARG_PAGES ; i++) {
		struct page *page = bprm->page[i];
		if (page) {
			bprm->page[i] = NULL;
			current->mm->rss++;
			put_dirty_page(current,page,stack_base);
		}
		stack_base += PAGE_SIZE;
	}
	up_write(&current->mm->mmap_sem);
	
	return 0;
}

Example #3

unsigned long setup_arg_pages(unsigned long p, struct linux_binprm * bprm)
{
	unsigned long stack_base;
	struct vm_area_struct *mpnt;
	int i;

	stack_base = STACK_TOP - MAX_ARG_PAGES*PAGE_SIZE;

	p += stack_base;
	if (bprm->loader)
		bprm->loader += stack_base;
	bprm->exec += stack_base;

	mpnt = (struct vm_area_struct *)kmalloc(sizeof(*mpnt), GFP_KERNEL);
	if (mpnt) {
		mpnt->vm_mm = current->mm;
		mpnt->vm_start = PAGE_MASK & (unsigned long) p;
		mpnt->vm_end = STACK_TOP;
		mpnt->vm_page_prot = PAGE_COPY;
		mpnt->vm_flags = VM_STACK_FLAGS;
		mpnt->vm_ops = NULL;
		mpnt->vm_offset = 0;
		mpnt->vm_inode = NULL;
		mpnt->vm_pte = 0;
		insert_vm_struct(current->mm, mpnt);
		current->mm->total_vm = (mpnt->vm_end - mpnt->vm_start) >> PAGE_SHIFT;

		for (i = 0 ; i < MAX_ARG_PAGES ; i++) {
			if (bprm->page[i]) {
				current->mm->rss++;
				put_dirty_page(current,bprm->page[i],stack_base);
			}
			stack_base += PAGE_SIZE;
		}
	} else {
		/*
		 * This one is tricky. We are already in the new context, so we cannot
		 * return with -ENOMEM. So we _have_ to deallocate argument pages here,
		 * if there is no VMA, they wont be freed at exit_mmap() -> memory leak.
		 *
		 * User space then gets a SIGSEGV when it tries to access argument pages.
		 */
		for (i = 0 ; i < MAX_ARG_PAGES ; i++) {

Example #4

File: ia32_binfmt.c Project: Rick33/freevms

int ia32_setup_arg_pages(struct linux_binprm *bprm)
{
	unsigned long stack_base;
	struct _rde *mpnt;
	int i, ret;

#define IA32_STACK_TOP1 STACK_TOP
#define IA32_STACK_TOP1 0x7ffffffffffe0000
	stack_base = IA32_STACK_TOP - MAX_ARG_PAGES*PAGE_SIZE;

	bprm->p += stack_base;
	if (bprm->loader)
		bprm->loader += stack_base;
	bprm->exec += stack_base;

	mpnt = kmem_cache_alloc(vm_area_cachep, SLAB_KERNEL);
	if (!mpnt) 
		return -ENOMEM; 
	
	down_write(&current->mm->mmap_sem);
	{
		mpnt->rde$pq_start_va = PAGE_MASK & (unsigned long) bprm->p;
		mpnt->rde$q_region_size = IA32_STACK_TOP1 - (unsigned long) mpnt->rde$pq_start_va;
		mpnt->rde$r_regprot.regprt$l_region_prot = _PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED;//PAGE_COPY;
		mpnt->rde$l_flags = vm_stack_flags32;
		insrde(mpnt,&current->pcb$l_phd->phd$ps_p0_va_list_flink);
		//flush_tlb_range(current->mm, mpnt->rde$pq_start_va, mpnt->rde$pq_start_va + PAGE_SIZE);
	} 

	for (i = 0 ; i < MAX_ARG_PAGES ; i++) {
		struct page *page = bprm->page[i];
		if (page) {
			bprm->page[i] = NULL;
			current->mm->rss++;
			put_dirty_page(current,page,stack_base);
		}
		stack_base += PAGE_SIZE;
	}
	up_write(&current->mm->mmap_sem);
	
	return 0;
}