time: fold __get_realtime_clock_ts() into getnstimeofday()

[linux-2.6-omap-h63xx.git] / kernel / ptrace.c

diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 3eca7a55f2ee8b13fb2fb6f3e09ea2d7a685acaf..c719bb9d79ab0dddd7a651d37b107b4368dfdd4b 100644 (file)
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -19,6 +19,7 @@
 #include <linux/security.h>
 #include <linux/signal.h>
 #include <linux/audit.h>
+#include <linux/pid_namespace.h>
 
 #include <asm/pgtable.h>
 #include <asm/uaccess.h>
@@ -119,7 +120,7 @@ int ptrace_check_attach(struct task_struct *child, int kill)
        return ret;
 }
 
-static int may_attach(struct task_struct *task)
+int __ptrace_may_attach(struct task_struct *task)
 {
        /* May we inspect the given task?
         * This check is used both for attaching with ptrace
@@ -153,7 +154,7 @@ int ptrace_may_attach(struct task_struct *task)
 {
        int err;
        task_lock(task);
-       err = may_attach(task);
+       err = __ptrace_may_attach(task);
        task_unlock(task);
        return !err;
 }
@@ -168,7 +169,7 @@ int ptrace_attach(struct task_struct *task)
        retval = -EPERM;
        if (task->pid <= 1)
                goto out;
-       if (task->tgid == current->tgid)
+       if (same_thread_group(task, current))
                goto out;
 
 repeat:
@@ -195,7 +196,7 @@ repeat:
        /* the same process cannot be attached many times */
        if (task->ptrace & PT_PTRACED)
                goto bad;
-       retval = may_attach(task);
+       retval = __ptrace_may_attach(task);
        if (retval)
                goto bad;
 
@@ -386,6 +387,9 @@ int ptrace_request(struct task_struct *child, long request,
        case PTRACE_SETSIGINFO:
                ret = ptrace_setsiginfo(child, (siginfo_t __user *) data);
                break;
+       case PTRACE_DETACH:      /* detach a process that was attached. */
+               ret = ptrace_detach(child, data);
+               break;
        default:
                break;
        }
@@ -440,7 +444,7 @@ struct task_struct *ptrace_get_task_struct(pid_t pid)
                return ERR_PTR(-EPERM);
 
        read_lock(&tasklist_lock);
-       child = find_task_by_pid(pid);
+       child = find_task_by_vpid(pid);
        if (child)
                get_task_struct(child);
 
@@ -450,6 +454,10 @@ struct task_struct *ptrace_get_task_struct(pid_t pid)
        return child;
 }
 
+#ifndef arch_ptrace_attach
+#define arch_ptrace_attach(child)      do { } while (0)
+#endif
+
 #ifndef __ARCH_SYS_PTRACE
 asmlinkage long sys_ptrace(long request, long pid, long addr, long data)
 {
@@ -462,6 +470,8 @@ asmlinkage long sys_ptrace(long request, long pid, long addr, long data)
        lock_kernel();
        if (request == PTRACE_TRACEME) {
                ret = ptrace_traceme();
+               if (!ret)
+                       arch_ptrace_attach(current);
                goto out;
        }
 
@@ -473,6 +483,12 @@ asmlinkage long sys_ptrace(long request, long pid, long addr, long data)
 
        if (request == PTRACE_ATTACH) {
                ret = ptrace_attach(child);
+               /*
+                * Some architectures need to do book-keeping after
+                * a ptrace attach.
+                */
+               if (!ret)
+                       arch_ptrace_attach(child);
                goto out_put_task_struct;
        }