Don't allow normal users to set idle IO priority

It has all the normal priority inversion problems.

Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/fs/ioprio.c b/fs/ioprio.c
index 97e1f088ba00b3b63f7f9ea594b756781fcf6596..d1c1f2b2c9da9796affc6be18b8793489b9f2873 100644 (file)
--- a/fs/ioprio.c
+++ b/fs/ioprio.c
@@ -62,6 +62,8 @@ asmlinkage long sys_ioprio_set(int which, int who, int ioprio)
 
                        break;
                case IOPRIO_CLASS_IDLE:
+                       if (!capable(CAP_SYS_ADMIN))
+                               return -EPERM;
                        break;
                default:
                        return -EINVAL;