netdev - Re: [PATCH bpf] tools: bpftool: fix crash with un-owned prog arrays

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Date:   Tue, 29 Jan 2019 00:23:18 +0100
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>,
        alexei.starovoitov@...il.com
Cc:     oss-drivers@...ronome.com, netdev@...r.kernel.org
Subject: Re: [PATCH bpf] tools: bpftool: fix crash with un-owned prog arrays

On 01/28/2019 07:01 PM, Jakub Kicinski wrote:
> Prog arrays don't have 'owner_prog_type' and 'owner_jited'
> fields in their fdinfo when they are created.  Those fields
> are set and reported when first program is checked for
> compatibility by bpf_prog_array_compatible().
> 
> This means that bpftool cannot expect the fields to always
> be there.  Currently trying to show maps on a system with
> an un-owned prog array leads to a crash:
> 
> $ bpftool map show
> 389: prog_array  name tail_call_map  flags 0x0
> Error: key 'owner_prog_type' not found in fdinfo
> Error: key 'owner_jited' not found in fdinfo
>        key 4B  value 4B  max_entries 4  memlock 4096B
>        Segmentation fault (core dumped)
> 
> We pass a NULL pointer to atoi().
> 
> Remove the assumption that fdinfo keys are always present.
> Add missing validations and remove the p_err() calls which
> may lead to broken JSON output as caller will not propagate
> the failure.
> 
> Fixes: 99a44bef5870 ("tools: bpftool: add owner_prog_type and owner_jited to bpftool output")
> Signed-off-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
> Reviewed-by: Quentin Monnet <quentin.monnet@...ronome.com>

Applied, thanks!