This is a note to let you know that I've just added the patch titled
drm/compat: Clear bounce structures
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-compat-clear-bounce-structures.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From de066e116306baf3a6a62691ac63cfc0b1dabddb Mon Sep 17 00:00:00 2001
From: Daniel Vetter <daniel.vetter@xxxxxxxx>
Date: Mon, 22 Feb 2021 11:06:43 +0100
Subject: drm/compat: Clear bounce structures
From: Daniel Vetter <daniel.vetter@xxxxxxxx>
commit de066e116306baf3a6a62691ac63cfc0b1dabddb upstream.
Some of them have gaps, or fields we don't clear. Native ioctl code
does full copies plus zero-extends on size mismatch, so nothing can
leak. But compat is more hand-rolled so need to be careful.
None of these matter for performance, so just memset.
Also I didn't fix up the CONFIG_DRM_LEGACY or CONFIG_DRM_AGP ioctl, those
are security holes anyway.
Acked-by: Maxime Ripard <mripard@xxxxxxxxxx>
Reported-by: syzbot+620cf21140fc7e772a5d@xxxxxxxxxxxxxxxxxxxxxxxxx # vblank ioctl
Cc: syzbot+620cf21140fc7e772a5d@xxxxxxxxxxxxxxxxxxxxxxxxx
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20210222100643.400935-1-daniel.vetter@xxxxxxxx
(cherry picked from commit e926c474ebee404441c838d18224cd6f246a71b7)
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/drm_ioc32.c | 11 +++++++++++
1 file changed, 11 insertions(+)
--- a/drivers/gpu/drm/drm_ioc32.c
+++ b/drivers/gpu/drm/drm_ioc32.c
@@ -99,6 +99,8 @@ static int compat_drm_version(struct fil
if (copy_from_user(&v32, (void __user *)arg, sizeof(v32)))
return -EFAULT;
+ memset(&v, 0, sizeof(v));
+
v = (struct drm_version) {
.name_len = v32.name_len,
.name = compat_ptr(v32.name),
@@ -137,6 +139,9 @@ static int compat_drm_getunique(struct f
if (copy_from_user(&uq32, (void __user *)arg, sizeof(uq32)))
return -EFAULT;
+
+ memset(&uq, 0, sizeof(uq));
+
uq = (struct drm_unique){
.unique_len = uq32.unique_len,
.unique = compat_ptr(uq32.unique),
@@ -265,6 +270,8 @@ static int compat_drm_getclient(struct f
if (copy_from_user(&c32, argp, sizeof(c32)))
return -EFAULT;
+ memset(&client, 0, sizeof(client));
+
client.idx = c32.idx;
err = drm_ioctl_kernel(file, drm_getclient, &client, 0);
@@ -852,6 +859,8 @@ static int compat_drm_wait_vblank(struct
if (copy_from_user(&req32, argp, sizeof(req32)))
return -EFAULT;
+ memset(&req, 0, sizeof(req));
+
req.request.type = req32.request.type;
req.request.sequence = req32.request.sequence;
req.request.signal = req32.request.signal;
@@ -889,6 +898,8 @@ static int compat_drm_mode_addfb2(struct
struct drm_mode_fb_cmd2 req64;
int err;
+ memset(&req64, 0, sizeof(req64));
+
if (copy_from_user(&req64, argp,
offsetof(drm_mode_fb_cmd232_t, modifier)))
return -EFAULT;
Patches currently in stable-queue which might be from daniel.vetter@xxxxxxxx are
queue-5.10/drm-use-usb-controller-s-dma-mask-when-importing-dmabufs.patch
queue-5.10/drm-compat-clear-bounce-structures.patch
