netdev - Re: [PATCH] tools bpftool: Fix json dump crash on powerpc

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Message-ID: <f287a4c6-f9f6-f001-edab-83a7d3a9074e@netronome.com>
Date:   Thu, 4 Jul 2019 18:37:53 +0100
From:   Quentin Monnet <quentin.monnet@...ronome.com>
To:     Jiri Olsa <jolsa@...nel.org>, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>
Cc:     Michael Petlan <mpetlan@...hat.com>, netdev@...r.kernel.org,
        bpf@...r.kernel.org, Martin KaFai Lau <kafai@...com>
Subject: Re: [PATCH] tools bpftool: Fix json dump crash on powerpc

2019-07-04 10:58 UTC+0200 ~ Jiri Olsa <jolsa@...nel.org>
> Michael reported crash with by bpf program in json mode on powerpc:
> 
>   # bpftool prog -p dump jited id 14
>   [{
>         "name": "0xd00000000a9aa760",
>         "insns": [{
>                 "pc": "0x0",
>                 "operation": "nop",
>                 "operands": [null
>                 ]
>             },{
>                 "pc": "0x4",
>                 "operation": "nop",
>                 "operands": [null
>                 ]
>             },{
>                 "pc": "0x8",
>                 "operation": "mflr",
>   Segmentation fault (core dumped)
> 
> The code is assuming char pointers in format, which is not always
> true at least for powerpc. Fixing this by dumping the whole string
> into buffer based on its format.
> 
> Please note that libopcodes code does not check return values from
> fprintf callback, so there's no point to return error in case of
> allocation failure.
> 
> Reported-by: Michael Petlan <mpetlan@...hat.com>
> Signed-off-by: Jiri Olsa <jolsa@...nel.org>

Looks good to me, thank you for the fix!

Reviewed-by: Quentin Monnet <quentin.monnet@...ronome.com>