linux-kernel - [PATCH 1/8] compat_ioctl: Supress "unknown cmd" message on serial /dev/console

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Message-Id: <1264031403-32239-1-git-send-email-gregkh@suse.de>
Date:	Wed, 20 Jan 2010 15:49:56 -0800
From:	Greg Kroah-Hartman <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org
Cc:	Atsushi Nemoto <anemo@....ocn.ne.jp>,
	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [PATCH 1/8] compat_ioctl: Supress "unknown cmd" message on serial /dev/console

From: Atsushi Nemoto <anemo@....ocn.ne.jp>

After the commit fb07a5f8 ("compat_ioctl: remove all VT ioctl
handling"), I got this error message on 64-bit mips kernel with 32-bit
busybox userland:

ioctl32(init:1): Unknown cmd fd(0) cmd(00005600){t:'V';sz:0} arg(7fd76480) on /dev/console

The cmd 5600 is VT_OPENQRY.  The busybox's init issues this ioctl to
know vt-console or serial-console.  If the console was serial console,
VT ioctls are not handled by the serial driver.

And by quick search, I found some programs using VT_GETMODE to check
vt-console is available or not.

Signed-off-by: Atsushi Nemoto <anemo@....ocn.ne.jp>
Cc: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
 fs/compat_ioctl.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c
index 332dd00..c5c45de 100644
--- a/fs/compat_ioctl.c
+++ b/fs/compat_ioctl.c
@@ -1005,6 +1005,9 @@ COMPATIBLE_IOCTL(SCSI_IOCTL_SEND_COMMAND)
 COMPATIBLE_IOCTL(SCSI_IOCTL_PROBE_HOST)
 COMPATIBLE_IOCTL(SCSI_IOCTL_GET_PCI)
 #endif
+/* Big V (don't complain on serial console) */
+IGNORE_IOCTL(VT_OPENQRY)
+IGNORE_IOCTL(VT_GETMODE)
 /* Little p (/dev/rtc, /dev/envctrl, etc.) */
 COMPATIBLE_IOCTL(RTC_AIE_ON)
 COMPATIBLE_IOCTL(RTC_AIE_OFF)
-- 
1.6.5.7

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