Re: [PATCH v2] drm: Account property blob allocations to memcg

[Maxime Ripard]

Hi,

On Mon, Jan 05, 2026 at 11:14:13AM -0500, Xiao Kan wrote:
> DRM_IOCTL_MODE_CREATEPROPBLOB allows userspace to allocate arbitrary-sized
> property blobs backed by kernel memory.
> 
> Currently, the blob data allocation is not accounted to the allocating
> process's memory cgroup, allowing unprivileged users to trigger unbounded
> kernel memory consumption and potentially cause system-wide OOM.
> 
> Mark the property blob data allocation with GFP_ACCOUNT so that the memory
> is properly charged to the caller's memcg. This ensures existing cgroup
> memory limits apply and prevents uncontrolled kernel memory growth without
> introducing additional policy or per-file limits.
> 
> Changes since v1:
>   - Drop the per-drm_file blob count limit.
>   - Account blob data allocations to memcg via GFP_KERNEL_ACCOUNT instead.
> 
> Signed-off-by: Xiao Kan <814091656@xxxxxx>
> Signed-off-by: Xiao Kan <xiao.kan@xxxxxxxxxxx>

It looks like you sent two different patches labelled v2? Sending a new
version in itself is not a problem (and even encourage), but you should
always bump the version number.

Maxime

Attachment: signature.asc
Description: PGP signature