This is a note to let you know that I've just added the patch titled

vt_ioctl: make VT_RESIZEX behave like VT_RESIZE

to my tty git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty.git in the tty-testing branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will be merged to the tty-next branch sometime soon, after it passes testing, and the merge window is open.

If you have any questions about this process, please let me know.

From 988d0763361bb65690d60e2bc53a6b72777040c3 Mon Sep 17 00:00:00 2001

From: Tetsuo Handa penguin-kernel@i-love.sakura.ne.jp Date: Sun, 27 Sep 2020 20:46:30 +0900 Subject: vt_ioctl: make VT_RESIZEX behave like VT_RESIZE

syzbot is reporting UAF/OOB read at bit_putcs()/soft_cursor() [1][2], for vt_resizex() from ioctl(VT_RESIZEX) allows setting font height larger than actual font height calculated by con_font_set() from ioctl(PIO_FONT). Since fbcon_set_font() from con_font_set() allocates minimal amount of memory based on actual font height calculated by con_font_set(), use of vt_resizex() can cause UAF/OOB read for font data.

VT_RESIZEX was introduced in Linux 1.3.3, but it is unclear that what comes to the "+ more" part, and I couldn't find a user of VT_RESIZEX.

#define VT_RESIZE 0x5609 /* set kernel's idea of screensize */ #define VT_RESIZEX 0x560A /* set kernel's idea of screensize + more */

So far we are not aware of syzbot reports caused by setting non-zero value to v_vlin parameter. But given that it is possible that nobody is using VT_RESIZEX, we can try removing support for v_clin and v_vlin parameters.

Therefore, this patch effectively makes VT_RESIZEX behave like VT_RESIZE, with emitting a message if somebody is still using v_clin and/or v_vlin parameters.

[1] https://syzkaller.appspot.com/bug?id=32577e96d88447ded2d3b76d71254fb85524583... [2] https://syzkaller.appspot.com/bug?id=6b8355d27b2b94fb5cedf4655e3a59162d9e48e...

Reported-by: syzbot syzbot+b308f5fd049fbbc6e74f@syzkaller.appspotmail.com Reported-by: syzbot syzbot+16469b5e8e5a72e9131e@syzkaller.appspotmail.com Signed-off-by: Tetsuo Handa penguin-kernel@I-love.SAKURA.ne.jp Cc: stable stable@vger.kernel.org Link: https://lore.kernel.org/r/4933b81b-9b1a-355b-df0e-9b31e8280ab9@i-love.sakura... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/tty/vt/vt_ioctl.c | 57 +++++++-------------------------------- 1 file changed, 10 insertions(+), 47 deletions(-)

diff --git a/drivers/tty/vt/vt_ioctl.c b/drivers/tty/vt/vt_ioctl.c index 2ea76a09e07f..0a33b8ababe3 100644 --- a/drivers/tty/vt/vt_ioctl.c +++ b/drivers/tty/vt/vt_ioctl.c @@ -772,58 +772,21 @@ static int vt_resizex(struct vc_data *vc, struct vt_consize __user *cs) if (copy_from_user(&v, cs, sizeof(struct vt_consize))) return -EFAULT;

- /* FIXME: Should check the copies properly */ - if (!v.v_vlin) - v.v_vlin = vc->vc_scan_lines; - - if (v.v_clin) { - int rows = v.v_vlin / v.v_clin; - if (v.v_rows != rows) { - if (v.v_rows) /* Parameters don't add up */ - return -EINVAL; - v.v_rows = rows; - } - } - - if (v.v_vcol && v.v_ccol) { - int cols = v.v_vcol / v.v_ccol; - if (v.v_cols != cols) { - if (v.v_cols) - return -EINVAL; - v.v_cols = cols; - } - } - - if (v.v_clin > 32) - return -EINVAL; + if (v.v_vlin) + pr_info_once(""struct vt_consize"->v_vlin is ignored. Please report if you need this.\n"); + if (v.v_clin) + pr_info_once(""struct vt_consize"->v_clin is ignored. Please report if you need this.\n");

+ console_lock(); for (i = 0; i < MAX_NR_CONSOLES; i++) { - struct vc_data *vcp; + vc = vc_cons[i].d;

- if (!vc_cons[i].d) - continue; - console_lock(); - vcp = vc_cons[i].d; - if (vcp) { - int ret; - int save_scan_lines = vcp->vc_scan_lines; - int save_font_height = vcp->vc_font.height; - - if (v.v_vlin) - vcp->vc_scan_lines = v.v_vlin; - if (v.v_clin) - vcp->vc_font.height = v.v_clin; - vcp->vc_resize_user = 1; - ret = vc_resize(vcp, v.v_cols, v.v_rows); - if (ret) { - vcp->vc_scan_lines = save_scan_lines; - vcp->vc_font.height = save_font_height; - console_unlock(); - return ret; - } + if (vc) { + vc->vc_resize_user = 1; + vc_resize(vc, v.v_cols, v.v_rows); } - console_unlock(); } + console_unlock();

return 0; }