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-rw-r--r--kernel/ptrace.c54
1 files changed, 0 insertions, 54 deletions
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 9a111f70145c..8aad0331d82e 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -241,60 +241,6 @@ int ptrace_detach(struct task_struct *child, unsigned int data)
241 return 0; 241 return 0;
242} 242}
243 243
244/*
245 * Access another process' address space.
246 * Source/target buffer must be kernel space,
247 * Do not walk the page table directly, use get_user_pages
248 */
249
250int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write)
251{
252 struct mm_struct *mm;
253 struct vm_area_struct *vma;
254 struct page *page;
255 void *old_buf = buf;
256
257 mm = get_task_mm(tsk);
258 if (!mm)
259 return 0;
260
261 down_read(&mm->mmap_sem);
262 /* ignore errors, just check how much was sucessfully transfered */
263 while (len) {
264 int bytes, ret, offset;
265 void *maddr;
266
267 ret = get_user_pages(tsk, mm, addr, 1,
268 write, 1, &page, &vma);
269 if (ret <= 0)
270 break;
271
272 bytes = len;
273 offset = addr & (PAGE_SIZE-1);
274 if (bytes > PAGE_SIZE-offset)
275 bytes = PAGE_SIZE-offset;
276
277 maddr = kmap(page);
278 if (write) {
279 copy_to_user_page(vma, page, addr,
280 maddr + offset, buf, bytes);
281 set_page_dirty_lock(page);
282 } else {
283 copy_from_user_page(vma, page, addr,
284 buf, maddr + offset, bytes);
285 }
286 kunmap(page);
287 page_cache_release(page);
288 len -= bytes;
289 buf += bytes;
290 addr += bytes;
291 }
292 up_read(&mm->mmap_sem);
293 mmput(mm);
294
295 return buf - old_buf;
296}
297
298int ptrace_readdata(struct task_struct *tsk, unsigned long src, char __user *dst, int len) 244int ptrace_readdata(struct task_struct *tsk, unsigned long src, char __user *dst, int len)
299{ 245{
300 int copied = 0; 246 int copied = 0;