netdev - Re: [PATCH] bpf: Forbid trampoline attach for functions with variable arguments

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Date:   Thu, 06 May 2021 23:30:09 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Jiri Olsa <jolsa@...nel.org>
Cc:     ast@...nel.org, daniel@...earbox.net, andriin@...com,
        netdev@...r.kernel.org, bpf@...r.kernel.org, kafai@...com,
        songliubraving@...com, yhs@...com, john.fastabend@...il.com,
        kpsingh@...omium.org
Subject: Re: [PATCH] bpf: Forbid trampoline attach for functions with variable
 arguments

Hello:

This patch was applied to bpf/bpf.git (refs/heads/master):

On Wed,  5 May 2021 15:25:29 +0200 you wrote:
> We can't currently allow to attach functions with variable arguments.
> The problem is that we should save all the registers for arguments,
> which is probably doable, but if caller uses more than 6 arguments,
> we need stack data, which will be wrong, because of the extra stack
> frame we do in bpf trampoline, so we could crash.
> 
> Also currently there's malformed trampoline code generated for such
> functions at the moment as described in:
>   https://lore.kernel.org/bpf/20210429212834.82621-1-jolsa@kernel.org/
> 
> [...]

Here is the summary with links:
  - bpf: Forbid trampoline attach for functions with variable arguments
    https://git.kernel.org/bpf/bpf/c/0a1a616720d9

You are awesome, thank you!
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