#include <linux/types.h>
#include <linux/mm.h>
#include <linux/security.h>
-#include <linux/vs_memory.h>
#include <asm/param.h>
#include <asm/signal.h>
extern struct page *ia32_shared_page[];
extern unsigned long *ia32_gdt;
+extern struct page *ia32_gate_page;
struct page *
ia32_install_shared_page (struct vm_area_struct *vma, unsigned long address, int *type)
return pg;
}
+struct page *
+ia32_install_gate_page (struct vm_area_struct *vma, unsigned long address, int *type)
+{
+ struct page *pg = ia32_gate_page;
+ get_page(pg);
+ if (type)
+ *type = VM_FAULT_MINOR;
+ return pg;
+}
+
+
static struct vm_operations_struct ia32_shared_page_vm_ops = {
.nopage = ia32_install_shared_page
};
+static struct vm_operations_struct ia32_gate_page_vm_ops = {
+ .nopage = ia32_install_gate_page
+};
+
void
ia64_elf32_init (struct pt_regs *regs)
{
up_write(¤t->mm->mmap_sem);
}
+ /*
+ * When user stack is not executable, push sigreturn code to stack makes
+ * segmentation fault raised when returning to kernel. So now sigreturn
+ * code is locked in specific gate page, which is pointed by pretcode
+ * when setup_frame_ia32
+ */
+ vma = kmem_cache_alloc(vm_area_cachep, SLAB_KERNEL);
+ if (vma) {
+ memset(vma, 0, sizeof(*vma));
+ vma->vm_mm = current->mm;
+ vma->vm_start = IA32_GATE_OFFSET;
+ vma->vm_end = vma->vm_start + PAGE_SIZE;
+ vma->vm_page_prot = PAGE_COPY_EXEC;
+ vma->vm_flags = VM_READ | VM_MAYREAD | VM_EXEC
+ | VM_MAYEXEC | VM_RESERVED;
+ vma->vm_ops = &ia32_gate_page_vm_ops;
+ down_write(¤t->mm->mmap_sem);
+ {
+ insert_vm_struct(current->mm, vma);
+ }
+ up_write(¤t->mm->mmap_sem);
+ }
+
/*
* Install LDT as anonymous memory. This gives us all-zero segment descriptors
* until a task modifies them via modify_ldt().
mpnt->vm_page_prot = (mpnt->vm_flags & VM_EXEC)?
PAGE_COPY_EXEC: PAGE_COPY;
insert_vm_struct(current->mm, mpnt);
- // current->mm->total_vm = (mpnt->vm_end - mpnt->vm_start) >> PAGE_SHIFT;
- vx_vmpages_sub(current->mm, current->mm->total_vm -
- ((mpnt->vm_end - mpnt->vm_start) >> PAGE_SHIFT));
+ // current->mm->stack_vm = current->mm->total_vm = vma_pages(mpnt);
+ vx_vmpages_sub(current->mm, current->mm->total_vm - vma_pages(mpnt));
+ current->mm->stack_vm = current->mm->total_vm;
}
for (i = 0 ; i < MAX_ARG_PAGES ; i++) {