/* 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;
}
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(¤t->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(¤t->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(¤t->mm->mmap_sem);
return 0;
}
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++) {
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(¤t->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,¤t->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(¤t->mm->mmap_sem);
return 0;
}