tty: vt, remove reduntant check

MAX_NR_CONSOLES and MAX_NR_USER_CONSOLES are both 63 since they were
introduced in 1.1.54. And since vc_allocate does:

if (currcons >= MAX_NR_CONSOLES)
	return -ENXIO;

if (!vc_cons[currcons].d) {
	if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
		return -EPERM;
}

the second check is pointless. Remove both the check and the macro
MAX_NR_USER_CONSOLES.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Reported-by: Fugang Duan <fugang.duan@nxp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c
index 3e3c757..90305d5 100644 (file)
--- a/drivers/tty/vt/vt.c
+++ b/drivers/tty/vt/vt.c
@@ -768,10 +768,6 @@ int vc_allocate(unsigned int currcons)     /* return 0 on success */
            struct vc_data *vc;
            struct vt_notifier_param param;
 
-           /* prevent users from taking too much memory */
-           if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
-             return -EPERM;
-
            /* due to the granularity of kmalloc, we waste some memory here */
            /* the alloc is done in two steps, to optimize the common situation
               of a 25x80 console (structsize=216, screenbuf_size=4000) */

diff --git a/include/uapi/linux/vt.h b/include/uapi/linux/vt.h
index 978578b..f690348 100644 (file)
--- a/include/uapi/linux/vt.h
+++ b/include/uapi/linux/vt.h
@@ -8,7 +8,6 @@
  */
 #define MIN_NR_CONSOLES 1       /* must be at least 1 */
 #define MAX_NR_CONSOLES        63      /* serial lines start at 64 */
-#define MAX_NR_USER_CONSOLES 63        /* must be root to allocate above this */
                /* Note: the ioctl VT_GETSTATE does not work for
                   consoles 16 and higher (since it returns a short) */