pty: make ptmx file ops read-only after init
The ptmx_fops structure is only changed during init, so mark it as such.
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/tty/pty.c b/drivers/tty/pty.c
index 51e0d32..a23fa5e 100644
--- a/drivers/tty/pty.c
+++ b/drivers/tty/pty.c
@@ -800,7 +800,7 @@
return retval;
}
-static struct file_operations ptmx_fops;
+static struct file_operations ptmx_fops __ro_after_init;
static void __init unix98_pty_init(void)
{