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

[Alexei Starovoitov]

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