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Subject: Re: [PATCH bpf-next 0/3] Don't invoke KPTR_REF destructor on NULL xchg
From:   patchwork-bot+netdevbpf@kernel.org
Message-Id: <167978953539.24849.6734848364583344239.git-patchwork-notify@kernel.org>
Date:   Sun, 26 Mar 2023 00:12:15 +0000
References: <20230325213144.486885-1-void@manifault.com>
In-Reply-To: <20230325213144.486885-1-void@manifault.com>
To:     David Vernet <void@manifault.com>
Cc:     bpf@vger.kernel.org, ast@kernel.org, daniel@iogearbox.net,
        andrii@kernel.org, martin.lau@linux.dev, song@kernel.org,
        yhs@fb.com, john.fastabend@gmail.com, kpsingh@kernel.org,
        sdf@google.com, haoluo@google.com, jolsa@kernel.org,
        linux-kernel@vger.kernel.org, kernel-team@meta.com
Precedence: bulk

Hello:

This series was applied to bpf/bpf-next.git (master)
by Alexei Starovoitov <ast@kernel.org>:

On Sat, 25 Mar 2023 16:31:41 -0500 you wrote:
> When a map value is being freed, we loop over all of the fields of the
> corresponding BPF object and issue the appropriate cleanup calls
> corresponding to the field's type. If the field is a referenced kptr, we
> atomically xchg the value out of the map, and invoke the kptr's
> destructor on whatever was there before.
> 
> Currently, we always invoke the destructor (or bpf_obj_drop() for a
> local kptr) on any kptr, including if no value was xchg'd out of the
> map. This means that any function serving as the kptr's KF_RELEASE
> destructor must always treat the argument as possibly NULL, and we
> invoke unnecessary (and seemingly unsafe) cleanup logic for the local
> kptr path as well.
> 
> [...]

Here is the summary with links:
  - [bpf-next,1/3] bpf: Only invoke kptr dtor following non-NULL xchg
    https://git.kernel.org/bpf/bpf-next/c/1431d0b584a6
  - [bpf-next,2/3] bpf: Remove now-unnecessary NULL checks for KF_RELEASE kfuncs
    https://git.kernel.org/bpf/bpf-next/c/fb2211a57c11
  - [bpf-next,3/3] bpf: Treat KF_RELEASE kfuncs as KF_TRUSTED_ARGS
    https://git.kernel.org/bpf/bpf-next/c/6c831c468412

You are awesome, thank you!
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