netdev - Re: [net-next PATCH 0/4] Improve bpf ELF-loader under samples/bpf

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Message-Id: <20170502.154014.2024927301583088718.davem@davemloft.net>
Date:   Tue, 02 May 2017 15:40:14 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     brouer@...hat.com
Cc:     kafai@...com, netdev@...r.kernel.org, eric@...it.org,
        borkmann@...earbox.net, alexei.starovoitov@...il.com
Subject: Re: [net-next PATCH 0/4] Improve bpf ELF-loader under samples/bpf

From: Jesper Dangaard Brouer <brouer@...hat.com>
Date: Tue, 02 May 2017 14:31:45 +0200

> This series improves and fixes bpf ELF loader and programs under
> samples/bpf.  The bpf_load.c created some hard to debug issues when
> the struct (bpf_map_def) used in the ELF maps section format changed
> in commit fb30d4b71214 ("bpf: Add tests for map-in-map").
> 
> This was hotfixed in commit 409526bea3c3 ("samples/bpf: bpf_load.c
> detect and abort if ELF maps section size is wrong") by detecting the
> issue and aborting the program.
> 
> In most situations the bpf-loader should be able to handle these kind
> of changes to the struct size.  This patch series aim to do proper
> backward and forward compabilility handling when loading ELF files.
> 
> This series also adjust the callback that was introduced in commit
> 9fd63d05f3e8 ("bpf: Allow bpf sample programs (*_user.c) to change
> bpf_map_def") to use the new bpf_map_data structure, before more users
> start to use this callback.
> 
> Hoping these changes can make the merge window, as above mentioned
> commits have not been merged yet, and it would be good to avoid users
> hitting these issues.

Alexei and Daniel, please review.