Re: [PATCH bpf-next v4 2/9] bpf: Implement task local storage

[Martin KaFai Lau]

On Thu, Nov 05, 2020 at 03:47:48PM +0100, KP Singh wrote:
> From: KP Singh <kpsingh@xxxxxxxxxx>
> 
> Similar to bpf_local_storage for sockets and inodes add local storage
> for task_struct.
> 
> The life-cycle of storage is managed with the life-cycle of the
> task_struct.  i.e. the storage is destroyed along with the owning task
> with a callback to the bpf_task_storage_free from the task_free LSM
> hook.
> 
> The BPF LSM allocates an __rcu pointer to the bpf_local_storage in
> the security blob which are now stackable and can co-exist with other
> LSMs.
> 
> The userspace map operations can be done by using a pid fd as a key
> passed to the lookup, update and delete operations.
> 
> Acked-by: Song Liu <songliubraving@xxxxxx>
> Signed-off-by: KP Singh <kpsingh@xxxxxxxxxx>
Acked-by: Martin KaFai Lau <kafai@xxxxxx>