X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=kernel%2Fptrace.c;h=7c76f2ffaeaad78060cfb3223857a89c7a4ccb8f;hb=cc1bf182bb8451a036a7c227f0a95a0416c4736e;hp=3eca7a55f2ee8b13fb2fb6f3e09ea2d7a685acaf;hpb=194e3d174043f5ab22649a5cb38a1c05d015750f;p=linux-2.6

diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 3eca7a55f2..7c76f2ffae 100644
--- 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>
@@ -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:
@@ -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)
 {
@@ -473,6 +481,12 @@ 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;
 	}