linux-kernel - Re: [PATCH 0/3] Prevent out-of-bounds access for built-in font data buffers

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Message-ID: <20200924154516.GL4282@kadam>
Date:   Thu, 24 Sep 2020 18:45:16 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Peilin Ye <yepeilin.cs@...il.com>
Cc:     David Laight <David.Laight@...LAB.COM>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Jiri Slaby <jirislaby@...nel.org>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        syzkaller-bugs@...glegroups.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] Prevent out-of-bounds access for built-in font data
 buffers

Smatch has a tool to show where struct members are set.

`~/smatch/smatch_data/db/smdb.py where console_font height`

It's not perfect and this output comes from allmodconfig on yesterday's
linux-next.

regards,
dan carpenter

drivers/video/console/vgacon.c | vgacon_init                    | (struct console_font)->height | 0-32
drivers/video/console/vgacon.c | vgacon_adjust_height           | (struct console_font)->height | 1-32
drivers/video/fbdev/core/fbcon.c | fbcon_startup                  | (struct console_font)->height | 6,8,10-11,14,16,18,22,32
drivers/video/fbdev/core/fbcon.c | fbcon_init                     | (struct console_font)->height | 6,8,10-11,14,16,18,22,32
drivers/video/fbdev/core/fbcon.c | fbcon_do_set_font              | (struct console_font)->height | 0-u32max
drivers/video/fbdev/core/fbcon.c | fbcon_set_def_font             | (struct console_font)->height | 6,8,10-11,14,16,18,22,32
drivers/usb/misc/sisusbvga/sisusb_con.c | sisusbcon_init                 | (struct console_font)->height | 0-u32max
drivers/usb/misc/sisusbvga/sisusb_con.c | sisusbcon_do_font_op           | (struct console_font)->height | 1-32
drivers/tty/vt/vt_ioctl.c      | vt_k_ioctl                     | (struct console_font)->height | ignore
drivers/tty/vt/vt_ioctl.c      | vt_resizex                     | (struct console_font)->height | 0-u32max
drivers/tty/vt/vt_ioctl.c      | vt_ioctl                       | (struct console_font)->height | ignore
drivers/tty/vt/vt_ioctl.c      | vt_compat_ioctl                | (struct console_font)->height | ignore
drivers/tty/vt/vt.c            | vc_allocate                    | (struct console_font)->height | 0
drivers/tty/vt/vt.c            | vt_resize                      | (struct console_font)->height | ignore
drivers/tty/vt/vt.c            | do_con_write                   | (struct console_font)->height | ignore
drivers/tty/vt/vt.c            | con_unthrottle                 | (struct console_font)->height | ignore
drivers/tty/vt/vt.c            | con_flush_chars                | (struct console_font)->height | ignore
drivers/tty/vt/vt.c            | con_shutdown                   | (struct console_font)->height | ignore
drivers/tty/vt/vt.c            | con_cleanup                    | (struct console_font)->height | ignore
drivers/tty/vt/vt.c            | con_init                       | (struct console_font)->height | 0
drivers/tty/vt/vt.c            | con_font_set                   | (struct console_font)->height | 1-32
drivers/tty/vt/vt.c            | con_font_default               | (struct console_font)->height | 0-u32max
drivers/tty/vt/selection.c     | paste_selection                | (struct console_font)->height | ignore