1 files changed, 13 insertions, 14 deletions

diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index aaad0ec34194..0692ab5a0d67 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -21,9 +21,7 @@
 #include <linux/audit.h>
 #include <linux/pid_namespace.h>
 #include <linux/syscalls.h>
-
-#include <asm/pgtable.h>
-#include <asm/uaccess.h>
+#include <linux/uaccess.h>
 
 
 /*
@@ -48,7 +46,7 @@ void __ptrace_link(struct task_struct *child, struct task_struct *new_parent)
         list_add(&child->ptrace_entry, &new_parent->ptraced);
         child->parent = new_parent;
 }
- 
+
 /*
  * Turn a tracing stop into a normal stop now, since with no tracer there
  * would be no way to wake it up with SIGCONT or SIGKILL.  If there was a
@@ -173,7 +171,7 @@ bool ptrace_may_access(struct task_struct *task, unsigned int mode)
         task_lock(task);
         err = __ptrace_may_access(task, mode);
         task_unlock(task);
-        return (!err ? true : false);
+        return !err;
 }
 
 int ptrace_attach(struct task_struct *task)
@@ -190,7 +188,7 @@ int ptrace_attach(struct task_struct *task)
         /* Protect exec's credential calculations against our interference;
          * SUID, SGID and LSM creds get determined differently under ptrace.
          */
-        retval = mutex_lock_interruptible(&current->cred_exec_mutex);
+        retval = mutex_lock_interruptible(&task->cred_exec_mutex);
         if (retval  < 0)
                 goto out;
 
@@ -234,7 +232,7 @@ repeat:
 bad:
         write_unlock_irqrestore(&tasklist_lock, flags);
         task_unlock(task);
-        mutex_unlock(&current->cred_exec_mutex);
+        mutex_unlock(&task->cred_exec_mutex);
 out:
         return retval;
 }
@@ -358,7 +356,7 @@ int ptrace_readdata(struct task_struct *tsk, unsigned long src, char __user *dst
                 copied += retval;
                 src += retval;
                 dst += retval;
-                len -= retval;                  
+                len -= retval;
         }
         return copied;
 }
@@ -383,7 +381,7 @@ int ptrace_writedata(struct task_struct *tsk, char __user *src, unsigned long ds
                 copied += retval;
                 src += retval;
                 dst += retval;
-                len -= retval;                  
+                len -= retval;
         }
         return copied;
 }
@@ -496,9 +494,9 @@ static int ptrace_resume(struct task_struct *child, long request, long data)
                 if (unlikely(!arch_has_single_step()))
                         return -EIO;
                 user_enable_single_step(child);
-        }
-        else
+        } else {
                 user_disable_single_step(child);
+        }
 
         child->exit_code = data;
         wake_up_process(child);
@@ -606,10 +604,11 @@ repeat:
                 ret = security_ptrace_traceme(current->parent);
 
                 /*
-                 * Set the ptrace bit in the process ptrace flags.
-                 * Then link us on our parent's ptraced list.
+                 * Check PF_EXITING to ensure ->real_parent has not passed
+                 * exit_ptrace(). Otherwise we don't report the error but
+                 * pretend ->real_parent untraces us right after return.
                  */
-                if (!ret) {
+                if (!ret && !(current->real_parent->flags & PF_EXITING)) {
                         current->ptrace |= PT_PTRACED;
                         __ptrace_link(current, current->real_parent);
                 }