renegade-project/linux-next
2
0
Fork 0
mirror of https://github.com/edk2-porting/linux-next.git synced 2025-01-12 23:54:19 +08:00
Code

drm: inhibit drm drivers register to uninitialized drm core

Browse Source 
If the DRM core fails to init for whatever reason, ensure that
no driver ever calls drm_dev_register().

This is best done at drm_dev_init() as it covers drivers that call
drm_dev_alloc() as well as drivers that prefer to embed struct
drm_device into their own device struct and call drm_dev_init()
themselves.

In my case I had so many dynamic device majors used that the major
number for DRM (226) was stolen, causing DRM core init to fail after
failing to register a chrdev, and ultimately calling debugfs_remove()
on drm_debugfs_root in drm_core_exit().

After drm core failed to init, VGEM was still calling drm_dev_register(),
ultimately leading to drm_debugfs_init(), with drm_debugfs_root passed
as the root for the new debugfs dir at debugfs_create_dir().

This led to a kernel panic once we were either derefencing root->d_inode
while it was NULL or calling root->d_inode->i_op->lookup() while it was
NULL in debugfs at inode_lock() or lookup_*().

Signed-off-by: Alexandru Moise <00moses.alexander00@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20170708214352.GA27205@gmail.com
This commit is contained in:
Alexandru Moise 2017-07-08 23:43:52 +02:00 committed by Daniel Vetter
parent f74c527591
commit 371c2279aa
1 changed files with 16 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
drivers/gpu/drm/drm_drv.c
View File

@ -63,6 +63,15 @@ module_param_named(debug, drm_debug, int, 0600);
static DEFINE_SPINLOCK(drm_minor_lock);
static struct idr drm_minors_idr;
/*
* If the drm core fails to init for whatever reason,
* we should prevent any drivers from registering with it.
* It's best to check this at drm_dev_init(), as some drivers
* prefer to embed struct drm_device into their own device
* structure and call drm_dev_init() themselves.
*/
static bool drm_core_init_complete = false;
static struct dentry *drm_debugfs_root;
#define DRM_PRINTK_FMT "[" DRM_NAME ":%s]%s %pV"
@ -484,6 +493,11 @@ int drm_dev_init(struct drm_device *dev,
{
int ret;
if (!drm_core_init_complete) {
DRM_ERROR("DRM core is not initialized\n");
return -ENODEV;
}
kref_init(&dev->ref);
dev->dev = parent;
dev->driver = driver;
@ -966,6 +980,8 @@ static int __init drm_core_init(void)
if (ret < 0)
goto error;
drm_core_init_complete = true;
DRM_DEBUG("Initialized\n");
return 0;