[PATCH] NOMMU: Check that access_process_vm() has a valid target

Check that access_process_vm() is accessing a valid mapping in the target
process.

This limits ptrace() accesses and accesses through /proc/<pid>/maps to only
those regions actually mapped by a program.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 47 insertions, 0 deletions

diff --git a/mm/nommu.c b/mm/nommu.c
index d99dea31e443..d08acdae0036 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -1206,3 +1206,50 @@ struct page *filemap_nopage(struct vm_area_struct *area,
         BUG();
         return NULL;
 }
+
+/*
+ * Access another process' address space.
+ * - source/target buffer must be kernel space
+ */
+int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write)
+{
+        struct vm_list_struct *vml;
+        struct vm_area_struct *vma;
+        struct mm_struct *mm;
+
+        if (addr + len < addr)
+                return 0;
+
+        mm = get_task_mm(tsk);
+        if (!mm)
+                return 0;
+
+        down_read(&mm->mmap_sem);
+
+        /* the access must start within one of the target process's mappings */
+        for (vml = mm->context.vmlist; vml; vml = vml->next)
+                if (addr >= vml->vma->vm_start && addr < vml->vma->vm_end)
+                        break;
+
+        if (vml) {
+                vma = vml->vma;
+
+                /* don't overrun this mapping */
+                if (addr + len >= vma->vm_end)
+                        len = vma->vm_end - addr;
+
+                /* only read or write mappings where it is permitted */
+                if (write && vma->vm_flags & VM_WRITE)
+                        len -= copy_to_user((void *) addr, buf, len);
+                else if (!write && vma->vm_flags & VM_READ)
+                        len -= copy_from_user(buf, (void *) addr, len);
+                else
+                        len = 0;
+        } else {
+                len = 0;
+        }
+
+        up_read(&mm->mmap_sem);
+        mmput(mm);
+        return len;
+}