[PATCH 4.19 13/48] vgacon: Fix for missing check in scrollback handling

From: Greg Kroah-Hartman
Date: Mon Aug 10 2020 - 11:33:42 EST

From: Yunhai Zhang <zhangyunhai@xxxxxxxxxxx>

commit ebfdfeeae8c01fcb2b3b74ffaf03876e20835d2d upstream.

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 <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <fcntl.h>

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:

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 <zhangyunhai@xxxxxxxxxxx>
Reported-by: Yang Yingliang <yangyingliang@xxxxxxxxxx>
Reported-by: Kyungtae Kim <kt0755@xxxxxxxxx>
Fixes: 15bdab959c9b ([PATCH] vgacon: Add support for soft scrollback)
Cc: stable@xxxxxxxxxxxxxxx
Cc: linux-fbdev@xxxxxxxxxxxxxxx
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Solar Designer <solar@xxxxxxxxxxxx>
Cc: "Srivatsa S. Bhat" <srivatsa@xxxxxxxxxxxxx>
Cc: Anthony Liguori <aliguori@xxxxxxxxxx>
Cc: Yang Yingliang <yangyingliang@xxxxxxxxxx>
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@xxxxxxxxxxx>
Cc: Jiri Slaby <jirislaby@xxxxxxxxxx>
Signed-off-by: Yunhai Zhang <zhangyunhai@xxxxxxxxxxx>
Link: https://lore.kernel.org/r/9fb43895-ca91-9b07-ebfd-808cf854ca95@xxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

drivers/video/console/vgacon.c | 4 ++++
1 file changed, 4 insertions(+)

--- a/drivers/video/console/vgacon.c
+++ b/drivers/video/console/vgacon.c
@@ -251,6 +251,10 @@ static void vgacon_scrollback_update(str
p = (void *) (c->vc_origin + t * c->vc_size_row);

while (count--) {
+ if ((vgacon_scrollback_cur->tail + c->vc_size_row) >
+ vgacon_scrollback_cur->size)
+ vgacon_scrollback_cur->tail = 0;
scr_memcpyw(vgacon_scrollback_cur->data +
p, c->vc_size_row);