linux/drivers/video/console, branch v5.9

Merge tag 'drm-misc-fixes-2020-10-01' of git://anongit.freedesktop.org/drm/drm-misc into drm-fixes

2020-10-06T02:38:28Z

drm-misc-fixes for v5.9: - Small doc fix. - Re-add FB_ARMCLCD for android. - Fix global-out-of-bounds read in fbcon_get_font(). Signed-off-by: Dave Airlie From: Maarten Lankhorst Link: https://patchwork.freedesktop.org/patch/msgid/8585daa2-fcbc-3924-ac4f-e7b5668808e0@linux.intel.com

fbdev, newport_con: Move FONT_EXTRA_WORDS macros into linux/font.h

2020-09-25T08:28:18Z

drivers/video/console/newport_con.c is borrowing FONT_EXTRA_WORDS macros from drivers/video/fbdev/core/fbcon.h. To keep things simple, move all definitions into . Since newport_con now uses four extra words, initialize the fourth word in newport_set_font() properly. Cc: stable@vger.kernel.org Signed-off-by: Peilin Ye Reviewed-by: Greg Kroah-Hartman Signed-off-by: Daniel Vetter Link: https://patchwork.freedesktop.org/patch/msgid/7fb8bc9b0abc676ada6b7ac0e0bd443499357267.1600953813.git.yepeilin.cs@gmail.com

vgacon: remove software scrollback support

2020-09-14T17:06:15Z

Yunhai Zhang recently fixed a VGA software scrollback bug in commit ebfdfeeae8c0 ("vgacon: Fix for missing check in scrollback handling"), but that then made people look more closely at some of this code, and there were more problems on the vgacon side, but also the fbcon software scrollback. We don't really have anybody who maintains this code - probably because nobody actually _uses_ it any more. Sure, people still use both VGA and the framebuffer consoles, but they are no longer the main user interfaces to the kernel, and haven't been for decades, so these kinds of extra features end up bitrotting and not really being used. So rather than try to maintain a likely unused set of code, I'll just aggressively remove it, and see if anybody even notices. Maybe there are people who haven't jumped on the whole GUI badnwagon yet, and think it's just a fad. And maybe those people use the scrollback code. If that turns out to be the case, we can resurrect this again, once we've found the sucker^Wmaintainer for it who actually uses it. Reported-by: NopNop Nop Tested-by: Willy Tarreau Cc: 张云海 Acked-by: Andy Lutomirski Acked-by: Willy Tarreau Reviewed-by: Greg Kroah-Hartman Signed-off-by: Linus Torvalds

Merge tag 'tty-5.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty

2020-08-06T21:56:11Z

Pull tty/serial updates from Greg KH: "Here is the large set of TTY and Serial driver patches for 5.9-rc1. Lots of bugfixes in here, thanks to syzbot fuzzing for serial and vt and console code. Other highlights include: - much needed vt/vc code cleanup from Jiri Slaby - 8250 driver fixes and additions - various serial driver updates and feature enhancements - locking cleanup for serial/console initializations - other minor cleanups All of these have been in linux-next with no reported issues" * tag 'tty-5.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: (90 commits) MAINTAINERS: enlist Greg formally for console stuff vgacon: Fix for missing check in scrollback handling Revert "serial: 8250: Let serial core initialise spin lock" serial: 8250: Let serial core initialise spin lock tty: keyboard, do not speculate on func_table index serial: stm32: Add RS485 RTS GPIO control serial: 8250_dw: Fix common clocks usage race condition serial: 8250_dw: Pass the same rate to the clk round and set rate methods serial: 8250_dw: Simplify the ref clock rate setting procedure serial: 8250: Add 8250 port clock update method tty: serial: imx: add imx earlycon driver tty: serial: imx: enable imx serial console port as module tty/synclink: remove leftover bits of non-PCI card support tty: Use the preferred form for passing the size of a structure type tty: Fix identation issues in struct serial_struct32 tty: Avoid the use of one-element arrays serial: msm_serial: add sparse context annotation serial: pmac_zilog: add sparse context annotation newport_con: vc_color is now in state serial: imx: use hrtimers for rs485 delays ...

vgacon: Fix for missing check in scrollback handling

2020-08-04T07:40:35Z

vgacon_scrollback_update() always leaves enbough room in the scrollback buffer for the next call, but if the console size changed that room might not actually be enough, and so we need to re-check. The check should be in the loop since vgacon_scrollback_cur->tail is updated in the loop and count may be more than 1 when triggered by CSI M, as Jiri's PoC: #include #include #include #include #include #include #include int main(int argc, char** argv) { int fd = open("/dev/tty1", O_RDWR); unsigned short size[3] = {25, 200, 0}; ioctl(fd, 0x5609, size); // VT_RESIZE write(fd, "\e[1;1H", 6); for (int i = 0; i < 30; i++) write(fd, "\e[10M", 5); } It leads to various crashes as vgacon_scrollback_update writes out of the buffer: BUG: unable to handle page fault for address: ffffc900001752a0 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page RIP: 0010:mutex_unlock+0x13/0x30 ... Call Trace: n_tty_write+0x1a0/0x4d0 tty_write+0x1a0/0x2e0 Or to KASAN reports: BUG: KASAN: slab-out-of-bounds in vgacon_scroll+0x57a/0x8ed This fixes CVE-2020-14331. Reported-by: 张云海 Reported-by: Yang Yingliang Reported-by: Kyungtae Kim Fixes: 15bdab959c9b ([PATCH] vgacon: Add support for soft scrollback) Cc: stable@vger.kernel.org Cc: linux-fbdev@vger.kernel.org Cc: Linus Torvalds Cc: Solar Designer Cc: "Srivatsa S. Bhat" Cc: Anthony Liguori Cc: Yang Yingliang Cc: Bartlomiej Zolnierkiewicz Cc: Jiri Slaby Signed-off-by: Yunhai Zhang Link: https://lore.kernel.org/r/9fb43895-ca91-9b07-ebfd-808cf854ca95@nsfocus.com Signed-off-by: Greg Kroah-Hartman

newport_con: vc_color is now in state

2020-07-24T08:27:13Z

Since commit 28bc24fc46f9 (vc: separate state), vc->vc_color is known as vc->state.color. Somehow both me and 0-day bot missed this driver during the conversion. So fix the driver now. Reported-by: kernel test robot Fixes: 28bc24fc46f9 ("vc: separate state") Signed-off-by: Jiri Slaby Cc: Bartlomiej Zolnierkiewicz Cc: dri-devel@lists.freedesktop.org Cc: linux-fbdev@vger.kernel.org Cc: linux-mips@vger.kernel.org Link: https://lore.kernel.org/r/20200724062735.18229-1-jslaby@suse.cz Signed-off-by: Greg Kroah-Hartman

vt: use newly defined CUR_* macros

2020-06-24T15:08:33Z

We defined macros for all the magic constants in the previous patch. So let us use the macro in the code now. No functional change intended. Signed-off-by: Jiri Slaby Cc: Thomas Winischhofer Cc: Bartlomiej Zolnierkiewicz Cc: "James E.J. Bottomley" Cc: Helge Deller Cc: linux-usb@vger.kernel.org Cc: dri-devel@lists.freedesktop.org Cc: linux-fbdev@vger.kernel.org Cc: linux-parisc@vger.kernel.org Acked-by: Helge Deller Link: https://lore.kernel.org/r/20200615074910.19267-26-jslaby@suse.cz Signed-off-by: Greg Kroah-Hartman

vc: switch state to bool

2020-06-24T15:08:31Z

The code currently uses bitfields to store true-false values. Switch all of that to bools. Apart from the cleanup, it saves 20B of code as many shifts, ANDs, and ORs became simple movzb's. Signed-off-by: Jiri Slaby Link: https://lore.kernel.org/r/20200615074910.19267-3-jslaby@suse.cz Signed-off-by: Greg Kroah-Hartman

vt: introduce enum vc_intensity for intensity

2020-06-24T15:08:31Z

Introduce names (en enum) for 0, 1, and 2 constants. We now have VCI_HALF_BRIGHT, VCI_NORMAL, and VCI_BOLD instead. Apart from the cleanup, 1) the enum allows for better type checking, and 2) this saves some code. No more fiddling with bits is needed in assembly now. (OTOH, the structure is larger.) Signed-off-by: Jiri Slaby Link: https://lore.kernel.org/r/20200615074910.19267-2-jslaby@suse.cz Signed-off-by: Greg Kroah-Hartman

vc: separate state

2020-06-24T15:08:30Z

There are two copies of some members of struct vc_data. This is because we need to save them and restore later. Move these memebers to a separate structure called vc_state. So now instead of members like: vc_x, vc_y and vc_saved_x, vc_saved_y we have state and saved_state (of type: struct vc_state) containing state.x, state.y and saved_state.x, saved_state.y This change: * makes clear what is saved & restored * eases save & restore by using memcpy (see save_cur and restore_cur) Finally, we document the newly added struct vc_state using kernel-doc. Signed-off-by: Jiri Slaby Link: https://lore.kernel.org/r/20200615074910.19267-1-jslaby@suse.cz Signed-off-by: Greg Kroah-Hartman