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-rw-r--r--arch/x86_64/kernel/ptrace.c43
1 files changed, 1 insertions, 42 deletions
diff --git a/arch/x86_64/kernel/ptrace.c b/arch/x86_64/kernel/ptrace.c
index bbf64b59a21e..a87b6cebe80f 100644
--- a/arch/x86_64/kernel/ptrace.c
+++ b/arch/x86_64/kernel/ptrace.c
@@ -313,48 +313,11 @@ static unsigned long getreg(struct task_struct *child, unsigned long regno)
313 313
314} 314}
315 315
316asmlinkage long sys_ptrace(long request, long pid, unsigned long addr, long data) 316long arch_ptrace(struct task_struct *child, long request, long addr, long data)
317{ 317{
318 struct task_struct *child;
319 long i, ret; 318 long i, ret;
320 unsigned ui; 319 unsigned ui;
321 320
322 /* This lock_kernel fixes a subtle race with suid exec */
323 lock_kernel();
324 ret = -EPERM;
325 if (request == PTRACE_TRACEME) {
326 /* are we already being traced? */
327 if (current->ptrace & PT_PTRACED)
328 goto out;
329 ret = security_ptrace(current->parent, current);
330 if (ret)
331 goto out;
332 /* set the ptrace bit in the process flags. */
333 current->ptrace |= PT_PTRACED;
334 ret = 0;
335 goto out;
336 }
337 ret = -ESRCH;
338 read_lock(&tasklist_lock);
339 child = find_task_by_pid(pid);
340 if (child)
341 get_task_struct(child);
342 read_unlock(&tasklist_lock);
343 if (!child)
344 goto out;
345
346 ret = -EPERM;
347 if (pid == 1) /* you may not mess with init */
348 goto out_tsk;
349
350 if (request == PTRACE_ATTACH) {
351 ret = ptrace_attach(child);
352 goto out_tsk;
353 }
354 ret = ptrace_check_attach(child, request == PTRACE_KILL);
355 if (ret < 0)
356 goto out_tsk;
357
358 switch (request) { 321 switch (request) {
359 /* when I and D space are separate, these will need to be fixed. */ 322 /* when I and D space are separate, these will need to be fixed. */
360 case PTRACE_PEEKTEXT: /* read word at location addr. */ 323 case PTRACE_PEEKTEXT: /* read word at location addr. */
@@ -608,10 +571,6 @@ asmlinkage long sys_ptrace(long request, long pid, unsigned long addr, long data
608 ret = ptrace_request(child, request, addr, data); 571 ret = ptrace_request(child, request, addr, data);
609 break; 572 break;
610 } 573 }
611out_tsk:
612 put_task_struct(child);
613out:
614 unlock_kernel();
615 return ret; 574 return ret;
616} 575}
617 576