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Message-Id: <20210608110436.239583-1-desmondcheongzx@gmail.com>
Date: Tue, 8 Jun 2021 19:04:36 +0800
From: Desmond Cheong Zhi Xi <desmondcheongzx@...il.com>
To: maarten.lankhorst@...ux.intel.com, mripard@...nel.org,
tzimmermann@...e.de, airlied@...ux.ie, daniel@...ll.ch
Cc: Desmond Cheong Zhi Xi <desmondcheongzx@...il.com>,
dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
skhan@...uxfoundation.org, gregkh@...uxfoundation.org,
linux-kernel-mentees@...ts.linuxfoundation.org,
syzbot+c3a706cec1ea99e1c693@...kaller.appspotmail.com
Subject: [PATCH] drm: Fix use-after-free read in drm_getunique()
There is a time-of-check-to-time-of-use error in drm_getunique() due
to retrieving file_priv->master prior to locking the device's master
mutex.
An example can be seen in the crash report of the use-after-free error
found by Syzbot:
https://syzkaller.appspot.com/bug?id=148d2f1dfac64af52ffd27b661981a540724f803
In the report, the master pointer was used after being freed. This is
because another process had acquired the device's master mutex in
drm_setmaster_ioctl(), then overwrote fpriv->master in
drm_new_set_master(). The old value of fpriv->master was subsequently
freed before the mutex was unlocked.
To fix this, we lock the device's master mutex before retrieving the
pointer from from fpriv->master. This patch passes the Syzbot
reproducer test.
Reported-by: syzbot+c3a706cec1ea99e1c693@...kaller.appspotmail.com
Signed-off-by: Desmond Cheong Zhi Xi <desmondcheongzx@...il.com>
---
In this patch, I made the assumption that dev and file_priv->master->dev refer to the same struct drm_device*, and from my test runs this seemed to be the case. If this was a wrong assumption to make, please let me know.
drivers/gpu/drm/drm_ioctl.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c
index d273d1a8603a..495a4767a443 100644
--- a/drivers/gpu/drm/drm_ioctl.c
+++ b/drivers/gpu/drm/drm_ioctl.c
@@ -118,17 +118,18 @@ int drm_getunique(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
struct drm_unique *u = data;
- struct drm_master *master = file_priv->master;
+ struct drm_master *master;
- mutex_lock(&master->dev->master_mutex);
+ mutex_lock(&dev->master_mutex);
+ master = file_priv->master;
if (u->unique_len >= master->unique_len) {
if (copy_to_user(u->unique, master->unique, master->unique_len)) {
- mutex_unlock(&master->dev->master_mutex);
+ mutex_unlock(&dev->master_mutex);
return -EFAULT;
}
}
u->unique_len = master->unique_len;
- mutex_unlock(&master->dev->master_mutex);
+ mutex_unlock(&dev->master_mutex);
return 0;
}
--
2.25.1
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