linux-kernel - Re: 4.14 revert "seccomp: add a selftest for get

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Date:   Mon, 28 Jan 2019 10:22:42 -0700
From:   Tycho Andersen <tycho@...ho.ws>
To:     "Rantala, Tommi T. (Nokia - FI/Espoo)" <tommi.t.rantala@...ia.com>
Cc:     "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: 4.14 revert "seccomp: add a selftest for get_metadata"

On Mon, Jan 28, 2019 at 05:13:11PM +0000, Rantala, Tommi T. (Nokia - FI/Espoo) wrote:
> Hi Greg,
> 
> Can you please revert this commit in 4.14?
> 
> commit e65cd9a20343ea90f576c24c38ee85ab6e7d5fec
> Author: Tycho Andersen <tycho@...ho.ws>
> Date:   Tue Feb 20 19:47:47 2018 -0700
> 
>     seccomp: add a selftest for get_metadata
>     
>     [ Upstream commit d057dc4e35e16050befa3dda943876dab39cbf80 ]
>     
>     Let's test that we get the flags correctly, and that we preserve
> the filter
>     index across the ptrace(PTRACE_SECCOMP_GET_METADATA) correctly.
> 
> 
> 
> PTRACE_SECCOMP_GET_METADATA was only added in 4.16
> (26500475ac1b499d8636ff281311d633909f5d20)
> 
> 
> And it's also breaking seccomp_bpf.c compilation for me:
> 
> seccomp_bpf.c: In function ‘get_metadata’:
> seccomp_bpf.c:2878:26: error: storage size of ‘md’ isn’t known
>   struct seccomp_metadata md;

Yes, agreed. The get_metadata() stuff went in for 4.16, so anything
before that won't have the struct. Sorry if I missed the stable commit
before.

Cheers,

Tycho