netdev - Re: [PATCHv3 bpf] bpf: Take module reference for trampoline in module

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Date:   Fri, 26 Mar 2021 20:19:42 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Jiri Olsa <jolsa@...nel.org>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andriin@...com>, netdev@...r.kernel.org,
        bpf@...r.kernel.org, Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCHv3 bpf] bpf: Take module reference for trampoline in module

On Fri, Mar 26, 2021 at 11:59:00AM +0100, Jiri Olsa wrote:
> Currently module can be unloaded even if there's a trampoline
> register in it. It's easily reproduced by running in parallel:
> 
>   # while :; do ./test_progs -t module_attach; done
>   # while :; do rmmod bpf_testmod; sleep 0.5; done
> 
> Taking the module reference in case the trampoline's ip is
> within the module code. Releasing it when the trampoline's
> ip is unregistered.
> 
> Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> ---
>  v3 changes:
>    - store module pointer under bpf_trampoline struct

Applied.