* [PATCH 0/2] Persistent scrollback buffers for all VGA consoles
@ 2016-04-18 19:56 Manuel Schölling
0 siblings, 0 replies; 3+ messages in thread
From: Manuel Schölling @ 2016-04-18 19:56 UTC (permalink / raw)
To: gregkh
Cc: jslaby, thomas, plagnioj, tomi.valkeinen, jejb, deller,
manuel.schoelling, sfr, linux-kernel, linux-usb, linux-fbdev,
linux-parisc
Another attempt to add persistent scrollback buffers for all VGA consoles,
so the buffer is not flushed when swithing back and forth between consoles.
Note that breaks tools like bash's clear_console and thus might have
security implications:
clear_console relies on this 'anti-feature' of the kernel to clear the buffer
when consoles are switched.
To offer a way for userland tools to flush the buffer my second patch adds
a ioctl call for that.
Also this feature is disabled by default and security implications are clearly
stated in its documentation.
Manuel Schölling (2):
console: Add persistent scrollback buffers for all VGA consoles
console: Add ioctl for flushing the scrollback buffer
drivers/tty/vt/vt_ioctl.c | 20 ++++
drivers/usb/misc/sisusbvga/sisusb_con.c | 1 +
drivers/video/console/Kconfig | 22 +++-
drivers/video/console/dummycon.c | 1 +
drivers/video/console/mdacon.c | 6 +
drivers/video/console/newport_con.c | 1 +
drivers/video/console/sticon.c | 7 ++
drivers/video/console/vgacon.c | 195 ++++++++++++++++++++++----------
include/linux/console.h | 1 +
include/uapi/linux/vt.h | 1 +
10 files changed, 194 insertions(+), 61 deletions(-)
--
2.1.4
^ permalink raw reply [flat|nested] 3+ messages in thread
* [PATCH 0/2] Persistent scrollback buffers for all VGA consoles
@ 2016-04-18 19:56 Manuel Schölling
2016-04-18 20:38 ` Jakub Wilk
0 siblings, 1 reply; 3+ messages in thread
From: Manuel Schölling @ 2016-04-18 19:56 UTC (permalink / raw)
To: gregkh
Cc: jslaby, thomas, plagnioj, tomi.valkeinen, jejb, deller,
manuel.schoelling, sfr, linux-kernel, linux-usb, linux-fbdev,
linux-parisc
Another attempt to add persistent scrollback buffers for all VGA consoles,
so the buffer is not flushed when swithing back and forth between consoles.
Note that breaks tools like bash's clear_console and thus might have
security implications:
clear_console relies on this 'anti-feature' of the kernel to clear the buffer
when consoles are switched.
To offer a way for userland tools to flush the buffer my second patch adds
a ioctl call for that.
Also this feature is disabled by default and security implications are clearly
stated in its documentation.
Manuel Schölling (2):
console: Add persistent scrollback buffers for all VGA consoles
console: Add ioctl for flushing the scrollback buffer
drivers/tty/vt/vt_ioctl.c | 20 ++++
drivers/usb/misc/sisusbvga/sisusb_con.c | 1 +
drivers/video/console/Kconfig | 22 +++-
drivers/video/console/dummycon.c | 1 +
drivers/video/console/mdacon.c | 6 +
drivers/video/console/newport_con.c | 1 +
drivers/video/console/sticon.c | 7 ++
drivers/video/console/vgacon.c | 195 ++++++++++++++++++++++----------
include/linux/console.h | 1 +
include/uapi/linux/vt.h | 1 +
10 files changed, 194 insertions(+), 61 deletions(-)
--
2.1.4
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH 0/2] Persistent scrollback buffers for all VGA consoles
2016-04-18 19:56 Manuel Schölling
@ 2016-04-18 20:38 ` Jakub Wilk
0 siblings, 0 replies; 3+ messages in thread
From: Jakub Wilk @ 2016-04-18 20:38 UTC (permalink / raw)
To: Manuel Schölling
Cc: gregkh, jslaby, thomas, plagnioj, tomi.valkeinen, jejb, deller,
sfr, linux-kernel, linux-usb, linux-fbdev, linux-parisc
* Manuel Schölling <manuel.schoelling@gmx.de>, 2016-04-18, 21:56:
>To offer a way for userland tools to flush the buffer my second patch
>adds a ioctl call for that.
In f8df13e0a901fe55631fed66562369b4dba40f8b, the escape sequence \e[3J
was added, which erases the whole display including the scroll-back
buffer. So the new ioctl shouldn't be necessary.
--
Jakub Wilk
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2016-04-18 21:59 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2016-04-18 19:56 Manuel Schölling
2016-04-18 20:38 ` Jakub Wilk
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