* [PATCH v2] drm/radeon: fix race condition UAF in radeon_gem_set_domain_ioctl
@ 2023-06-03 7:43 Min Li
2023-06-05 8:12 ` Christian König
0 siblings, 1 reply; 3+ messages in thread
From: Min Li @ 2023-06-03 7:43 UTC (permalink / raw)
To: alexander.deucher
Cc: christian.koenig, Xinhui.Pan, airlied, daniel, sumit.semwal,
amd-gfx, dri-devel, linux-kernel, linux-media, linaro-mm-sig
Userspace can race to free the gobj(robj converted from), robj should not
be accessed again after drm_gem_object_put, otherwith it will result in
use-after-free.
Signed-off-by: Min Li <lm0963hack@gmail.com>
---
Changes in v2:
- Remove unused robj, avoid compile complain
drivers/gpu/drm/radeon/radeon_gem.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/radeon/radeon_gem.c b/drivers/gpu/drm/radeon/radeon_gem.c
index bdc5af23f005..d3f5ddbc1704 100644
--- a/drivers/gpu/drm/radeon/radeon_gem.c
+++ b/drivers/gpu/drm/radeon/radeon_gem.c
@@ -459,7 +459,6 @@ int radeon_gem_set_domain_ioctl(struct drm_device *dev, void *data,
struct radeon_device *rdev = dev->dev_private;
struct drm_radeon_gem_set_domain *args = data;
struct drm_gem_object *gobj;
- struct radeon_bo *robj;
int r;
/* for now if someone requests domain CPU -
@@ -472,13 +471,12 @@ int radeon_gem_set_domain_ioctl(struct drm_device *dev, void *data,
up_read(&rdev->exclusive_lock);
return -ENOENT;
}
- robj = gem_to_radeon_bo(gobj);
r = radeon_gem_set_domain(gobj, args->read_domains, args->write_domain);
drm_gem_object_put(gobj);
up_read(&rdev->exclusive_lock);
- r = radeon_gem_handle_lockup(robj->rdev, r);
+ r = radeon_gem_handle_lockup(rdev, r);
return r;
}
--
2.34.1
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH v2] drm/radeon: fix race condition UAF in radeon_gem_set_domain_ioctl
2023-06-03 7:43 [PATCH v2] drm/radeon: fix race condition UAF in radeon_gem_set_domain_ioctl Min Li
@ 2023-06-05 8:12 ` Christian König
2023-06-05 15:21 ` Alex Deucher
0 siblings, 1 reply; 3+ messages in thread
From: Christian König @ 2023-06-05 8:12 UTC (permalink / raw)
To: Min Li, alexander.deucher
Cc: Xinhui.Pan, airlied, daniel, sumit.semwal, amd-gfx, dri-devel,
linux-kernel, linux-media, linaro-mm-sig
Am 03.06.23 um 09:43 schrieb Min Li:
> Userspace can race to free the gobj(robj converted from), robj should not
> be accessed again after drm_gem_object_put, otherwith it will result in
> use-after-free.
>
> Signed-off-by: Min Li <lm0963hack@gmail.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
> ---
> Changes in v2:
> - Remove unused robj, avoid compile complain
>
> drivers/gpu/drm/radeon/radeon_gem.c | 4 +---
> 1 file changed, 1 insertion(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/radeon/radeon_gem.c b/drivers/gpu/drm/radeon/radeon_gem.c
> index bdc5af23f005..d3f5ddbc1704 100644
> --- a/drivers/gpu/drm/radeon/radeon_gem.c
> +++ b/drivers/gpu/drm/radeon/radeon_gem.c
> @@ -459,7 +459,6 @@ int radeon_gem_set_domain_ioctl(struct drm_device *dev, void *data,
> struct radeon_device *rdev = dev->dev_private;
> struct drm_radeon_gem_set_domain *args = data;
> struct drm_gem_object *gobj;
> - struct radeon_bo *robj;
> int r;
>
> /* for now if someone requests domain CPU -
> @@ -472,13 +471,12 @@ int radeon_gem_set_domain_ioctl(struct drm_device *dev, void *data,
> up_read(&rdev->exclusive_lock);
> return -ENOENT;
> }
> - robj = gem_to_radeon_bo(gobj);
>
> r = radeon_gem_set_domain(gobj, args->read_domains, args->write_domain);
>
> drm_gem_object_put(gobj);
> up_read(&rdev->exclusive_lock);
> - r = radeon_gem_handle_lockup(robj->rdev, r);
> + r = radeon_gem_handle_lockup(rdev, r);
> return r;
> }
>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH v2] drm/radeon: fix race condition UAF in radeon_gem_set_domain_ioctl
2023-06-05 8:12 ` Christian König
@ 2023-06-05 15:21 ` Alex Deucher
0 siblings, 0 replies; 3+ messages in thread
From: Alex Deucher @ 2023-06-05 15:21 UTC (permalink / raw)
To: Christian König
Cc: Min Li, alexander.deucher, Xinhui.Pan, linux-kernel, amd-gfx,
linaro-mm-sig, dri-devel, sumit.semwal, linux-media
Applied. Thanks!
On Mon, Jun 5, 2023 at 4:13 AM Christian König <christian.koenig@amd.com> wrote:
>
> Am 03.06.23 um 09:43 schrieb Min Li:
> > Userspace can race to free the gobj(robj converted from), robj should not
> > be accessed again after drm_gem_object_put, otherwith it will result in
> > use-after-free.
> >
> > Signed-off-by: Min Li <lm0963hack@gmail.com>
>
> Reviewed-by: Christian König <christian.koenig@amd.com>
>
> > ---
> > Changes in v2:
> > - Remove unused robj, avoid compile complain
> >
> > drivers/gpu/drm/radeon/radeon_gem.c | 4 +---
> > 1 file changed, 1 insertion(+), 3 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/radeon/radeon_gem.c b/drivers/gpu/drm/radeon/radeon_gem.c
> > index bdc5af23f005..d3f5ddbc1704 100644
> > --- a/drivers/gpu/drm/radeon/radeon_gem.c
> > +++ b/drivers/gpu/drm/radeon/radeon_gem.c
> > @@ -459,7 +459,6 @@ int radeon_gem_set_domain_ioctl(struct drm_device *dev, void *data,
> > struct radeon_device *rdev = dev->dev_private;
> > struct drm_radeon_gem_set_domain *args = data;
> > struct drm_gem_object *gobj;
> > - struct radeon_bo *robj;
> > int r;
> >
> > /* for now if someone requests domain CPU -
> > @@ -472,13 +471,12 @@ int radeon_gem_set_domain_ioctl(struct drm_device *dev, void *data,
> > up_read(&rdev->exclusive_lock);
> > return -ENOENT;
> > }
> > - robj = gem_to_radeon_bo(gobj);
> >
> > r = radeon_gem_set_domain(gobj, args->read_domains, args->write_domain);
> >
> > drm_gem_object_put(gobj);
> > up_read(&rdev->exclusive_lock);
> > - r = radeon_gem_handle_lockup(robj->rdev, r);
> > + r = radeon_gem_handle_lockup(rdev, r);
> > return r;
> > }
> >
>
^ permalink raw reply [flat|nested] 3+ messages in thread
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2023-06-03 7:43 [PATCH v2] drm/radeon: fix race condition UAF in radeon_gem_set_domain_ioctl Min Li
2023-06-05 8:12 ` Christian König
2023-06-05 15:21 ` Alex Deucher
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