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@xxxxxxx>
Reported-by: Fugang Duan <fugang.duan@xxxxxxx>
---
drivers/tty/vt/vt.c | 4 ----
include/uapi/linux/vt.h | 1 -
2 files changed, 5 deletions(-)
diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c
index 3e3c7575e92d..90305d569c06 100644
--- 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 978578bd1895..f69034887e68 100644
--- 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) */
--
2.7.4
--
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