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

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Message-ID: <20201105211644.onspyd6cytrskiw3@kafai-mbp.dhcp.thefacebook.com>
Date:   Thu, 5 Nov 2020 13:16:44 -0800
From:   Martin KaFai Lau <kafai@...com>
To:     KP Singh <kpsingh@...omium.org>
CC:     <linux-kernel@...r.kernel.org>, <bpf@...r.kernel.org>,
        Song Liu <songliubraving@...com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Paul Turner <pjt@...gle.com>, Jann Horn <jannh@...gle.com>,
        Hao Luo <haoluo@...gle.com>
Subject: Re: [PATCH bpf-next v4 2/9] bpf: Implement task local storage

On Thu, Nov 05, 2020 at 03:47:48PM +0100, KP Singh wrote:
> From: KP Singh <kpsingh@...gle.com>
> 
> 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@...com>
> Signed-off-by: KP Singh <kpsingh@...gle.com>
Acked-by: Martin KaFai Lau <kafai@...com>