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OpenCloudOS-Kernel
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Antonino A. Daplas 2ae8547775 vgacon: disallow console operations when in KD_GRAPHICS mode 
Reported by James Pearson as:

	 boot to run level 3

	 if not root, then make sure /dev/console is writeable

	 login and type:

	 setterm -blank 0

	 start X

	 type into an xterm:

	 while true; do echo "" > /dev/console; usleep 100000; done

	 while the above loop is running switch to the text console and back
	 again (Ctrl-Alt-F1 then Ctrl-Alt-F7)

	 ... and the screen will be shifting (and wrapping) to the left.

This problem stems from continuously writing text to the system console (which
is in KD_TEXT mode) while the foreground console is in KD_GRAPHICS
mode. Somewhere along the way, console printing got confused and omitted the
KD_GRAPHICS/KD_TEXT test.  Thus, vgacon attempted to scroll the screen of X,
which causes X to shift.

Fix by disallowing vgacon to touch the hardware when the vc is in KD_GRAPHICS
mode. A definitive fix entails a full audit of the console code.

Signed-off-by: Antonino Daplas <adaplas@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 		2007-05-08 11:15:33 -07:00
..
acorn [ARM] Acorn: move the i2c bus driver into drivers/i2c 2007-03-04 20:40:50 +00:00
acpi workaround rtc-related acpi table bugs 2007-05-08 11:15:18 -07:00
amba uevent: use add_uevent_var() instead of open coding it 2007-04-27 10:57:29 -07:00
ata Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm 2007-05-06 13:20:10 -07:00
atm PCI: Cleanup the includes of <linux/pci.h> 2007-05-02 19:02:35 -07:00
auxdisplay [PATCH] cfag12864b: fix crash when built-in and no parport present 2007-02-20 17:10:14 -08:00
base fix hotplug for legacy platform drivers 2007-05-08 11:15:10 -07:00
block cciss: include scsi/scsi.h unconditionally 2007-05-08 11:15:10 -07:00
bluetooth [Bluetooth] Correct SCO buffer for another Broadcom based dongle 2007-05-05 00:36:22 +02:00
cdrom mm: remove destroy_dirty_buffers from invalidate_bdev() 2007-05-07 12:12:55 -07:00
char use mutex instead of semaphore in virtual console driver 2007-05-08 11:15:33 -07:00
clocksource ACPI: correct pathname in comment 2007-04-25 14:27:06 -04:00
connector [NETLINK]: Switch cb_lock spinlock to mutex and allow to override it 2007-04-25 22:29:03 -07:00
cpufreq Add a new deferrable delayed work init 2007-05-08 11:15:05 -07:00
crypto [CRYPTO] padlock: Remove pointless padlock module 2007-05-02 22:08:26 +10:00
dio
…
dma [PATCH] rm pointless dmaengine exports 2007-03-16 19:25:03 -07:00
edac Fix 82875 PCI setup 2007-05-08 11:15:07 -07:00
eisa virtual_eisa_root_init() should be __init 2007-05-08 11:15:02 -07:00
fc4 [PATCH] remove many unneeded #includes of sched.h 2007-02-14 08:09:54 -08:00
firmware remove "struct subsystem" as it is no longer needed 2007-05-02 18:57:59 -07:00
hid header cleaning: don't include smp_lock.h when not used 2007-05-08 11:15:07 -07:00
hwmon use mutex instead of semaphore in hdaps driver 2007-05-08 11:15:15 -07:00
i2c header cleaning: don't include smp_lock.h when not used 2007-05-08 11:15:07 -07:00
ide ide-cs: recognize 2GB CompactFlash from Transcend 2007-05-05 22:03:51 +02:00
ieee1394 header cleaning: don't include smp_lock.h when not used 2007-05-08 11:15:07 -07:00
infiniband inode numbering: change libfs sb creation routines to avoid collisions with their root inodes 2007-05-08 11:15:16 -07:00
input header cleaning: don't include smp_lock.h when not used 2007-05-08 11:15:07 -07:00
isdn ISDN: Spinlock initializer cleanup 2007-05-08 11:15:17 -07:00
kvm KVM: Remove unused 'instruction_length' 2007-05-03 10:52:32 +03:00
leds leds: Add support for Cobalt Server front LED 2007-02-15 21:37:29 +00:00
macintosh header cleaning: don't include smp_lock.h when not used 2007-05-08 11:15:07 -07:00
mca
…
md Remove do_sync_file_range() 2007-05-08 11:15:04 -07:00
media Clean up mutex_trylock noise 2007-05-08 11:15:13 -07:00
message remove unused header file: drivers/message/i2o/i2o_lan.h 2007-05-08 11:15:02 -07:00
mfd header cleaning: don't include smp_lock.h when not used 2007-05-08 11:15:07 -07:00
misc Misc: add sensable phantom driver 2007-05-08 11:15:14 -07:00
mmc Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm 2007-05-06 13:20:10 -07:00
mtd Clean up mutex_trylock noise 2007-05-08 11:15:13 -07:00
net smsc-ircc2: add PNP support 2007-05-08 11:15:23 -07:00
nubus
…
oprofile [PATCH] oprofile: fix potential deadlock on oprofilefs_lock 2007-03-28 13:58:02 -07:00
parisc header cleaning: don't include smp_lock.h when not used 2007-05-08 11:15:07 -07:00
parport parport_serial: fix PCI must_checks 2007-05-08 11:15:08 -07:00
pci header cleaning: don't include smp_lock.h when not used 2007-05-08 11:15:07 -07:00
pcmcia fix hotplug for legacy platform drivers 2007-05-08 11:15:10 -07:00
pnp PNP: workaround HP BIOS defect that leaves SMCF010 device partly enabled 2007-05-08 11:15:23 -07:00
ps3 ps3av: Use __func__ instead of __FUNCTION__ 2007-05-04 17:59:09 -07:00
rapidio [PATCH] remove many unneeded #includes of sched.h 2007-02-14 08:09:54 -08:00
rtc rtc-cmos: make it load on PNPBIOS systems 2007-05-08 11:15:19 -07:00
s390 Merge master.kernel.org:/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6 2007-05-05 13:30:44 -07:00
sbus header cleaning: don't include smp_lock.h when not used 2007-05-08 11:15:07 -07:00
scsi Replace deprecated SA_xxx interrupt flags 2007-05-08 11:15:08 -07:00
serial x86, serial: convert legacy COM ports to platform devices 2007-05-08 11:15:23 -07:00
sh
…
sn [PATCH] IOC3/IOC4: PCI mem space resources 2007-02-11 10:51:25 -08:00
spi au1550 SPI controller driver 2007-05-08 11:15:16 -07:00
tc [PATCH] Fix build error on zs serial driver 2007-04-04 21:12:47 -07:00
telephony replace pci_find_device in drivers/telephony/ixj.c 2007-05-08 11:15:02 -07:00
usb SIS USB2VGA Warning fix 2007-05-08 11:15:27 -07:00
video vgacon: disallow console operations when in KD_GRAPHICS mode 2007-05-08 11:15:33 -07:00
w1 Driver for the Maxim DS1WM, a 1-wire bus master ASIC core 2007-05-08 11:15:14 -07:00
zorro Amiga Zorro bus: kill resource_size_t warnings 2007-05-04 17:59:08 -07:00
Kconfig [PATCH] drivers: add LCD support 2007-02-11 10:51:24 -08:00
Makefile i2c: Add i2c_board_info and i2c_new_device() 2007-05-01 23:26:31 +02:00