sethostname/setdomainname: notify userspace when there is a change in uts_kern_table

sethostname() and setdomainname() notify userspace on failure (without
modifying uts_kern_table).  Change things so that we only notify userspace
on success, when uts_kern_table was actually modified.

Signed-off-by: Sasikantha babu <sasikanth.v19@gmail.com>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: WANG Cong <amwang@redhat.com>
Reviewed-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/kernel/sys.c b/kernel/sys.c
index 6df42624e454aeb236ab1c9413d6fdf5f676365f..8b71cef3bf1a3c195c6094b98d8c85f453fbb41a 100644 (file)
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -1378,8 +1378,8 @@ SYSCALL_DEFINE2(sethostname, char __user *, name, int, len)
                memcpy(u->nodename, tmp, len);
                memset(u->nodename + len, 0, sizeof(u->nodename) - len);
                errno = 0;
+               uts_proc_notify(UTS_PROC_HOSTNAME);
        }
-       uts_proc_notify(UTS_PROC_HOSTNAME);
        up_write(&uts_sem);
        return errno;
 }
@@ -1429,8 +1429,8 @@ SYSCALL_DEFINE2(setdomainname, char __user *, name, int, len)
                memcpy(u->domainname, tmp, len);
                memset(u->domainname + len, 0, sizeof(u->domainname) - len);
                errno = 0;
+               uts_proc_notify(UTS_PROC_DOMAINNAME);
        }
-       uts_proc_notify(UTS_PROC_DOMAINNAME);
        up_write(&uts_sem);
        return errno;
 }