---

yaml --- r: 222873 b: refs/heads/master c: 33dd94a h: refs/heads/master i: 222871: 0672422 v: v3
git-mirror · Dec 2, 2010 · 8f46476 · 8f46476
1 parent 6ab030c
commit 8f46476
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Showing 2 changed files with 10 additions and 1 deletion.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: a0b0f58cdd32ab363a600a294ddaa90f0c32de8c
+refs/heads/master: 33dd94ae1ccbfb7bf0fb6c692bc3d1c4269e6177
diff --git a/trunk/kernel/exit.c b/trunk/kernel/exit.c
@@ -914,6 +914,15 @@ NORET_TYPE void do_exit(long code)
 	if (unlikely(!tsk->pid))
 		panic("Attempted to kill the idle task!");
 
+	/*
+	 * If do_exit is called because this processes oopsed, it's possible
+	 * that get_fs() was left as KERNEL_DS, so reset it to USER_DS before
+	 * continuing. Amongst other possible reasons, this is to prevent
+	 * mm_release()->clear_child_tid() from writing to a user-controlled
+	 * kernel address.
+	 */
+	set_fs(USER_DS);
+
 	tracehook_report_exit(&code);
 
 	validate_creds_for_do_exit(tsk);