linux-kernel - Re: [PATCH bpf-next v3 0/4] bpf: verifier: use target program's type for access verifications

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Date:   Wed, 26 Aug 2020 12:52:50 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Udip Pant <udippant@...com>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andriin@...com>,
        "David S . Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        bpf@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH bpf-next v3 0/4] bpf: verifier: use target program's type
 for access verifications

On Tue, Aug 25, 2020 at 04:19:59PM -0700, Udip Pant wrote:
> This patch series adds changes in verifier to make decisions such as granting
> of read / write access or enforcement of return code status based on
> the program type of the target program while using dynamic program
> extension (of type BPF_PROG_TYPE_EXT).
> 
> The BPF_PROG_TYPE_EXT type can be used to extend types such as XDP, SKB
> and others. Since the BPF_PROG_TYPE_EXT program type on itself is just a
> placeholder for those, we need this extended check for those extended
> programs to actually work with proper access, while using this option.
> 
> Patch #1 includes changes in the verifier.
> Patch #2 adds selftests to verify write access on a packet for a valid 
> extension program type
> Patch #3 adds selftests to verify proper check for the return code
> Patch #4 adds selftests to ensure access permissions and restrictions 
> for some map types such sockmap.
> 
> Changelogs:
>   v2 -> v3:
>     * more comprehensive resolution of the program type in the verifier
>       based on the target program (and not just for the packet access)
>     * selftests for checking return code and map access
>     * Also moved this patch to 'bpf-next' from 'bpf' tree

Applied. Thanks