From: Quentin Monnet <quentin.monnet@netronome.com>
To: Jakub Kicinski <jakub.kicinski@netronome.com>,
Jiri Olsa <jolsa@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>, Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Michael Petlan <mpetlan@redhat.com>,
netdev@vger.kernel.org, bpf@vger.kernel.org,
Martin KaFai Lau <kafai@fb.com>
Subject: Re: [PATCHv2] tools bpftool: Fix json dump crash on powerpc
Date: Fri, 5 Jul 2019 18:26:40 +0100 [thread overview]
Message-ID: <83d18af0-8efa-c8d5-3d99-01aed29915df@netronome.com> (raw)
In-Reply-To: <20190705102452.0831942a@cakuba.netronome.com>
2019-07-05 10:24 UTC-0700 ~ Jakub Kicinski <jakub.kicinski@netronome.com>
> On Fri, 5 Jul 2019 14:10:31 +0200, Jiri Olsa wrote:
>> 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, but as per Jakub suggestion returning -1 on allocation
>> failure so we do the best effort to propagate the error.
>>
>> Reported-by: Michael Petlan <mpetlan@redhat.com>
>> Signed-off-by: Jiri Olsa <jolsa@kernel.org>
>
> Thanks, let me repost all the tags (Quentin, please shout if you're
> not ok with this :)):
I confirm it's all good for me, thanks :)
>
> Fixes: 107f041212c1 ("tools: bpftool: add JSON output for `bpftool prog dump jited *` command")
> Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
> Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
>
next prev parent reply other threads:[~2019-07-05 17:26 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-04 8:58 [PATCH] tools bpftool: Fix json dump crash on powerpc Jiri Olsa
2019-07-04 17:37 ` Quentin Monnet
2019-07-04 20:42 ` Jakub Kicinski
2019-07-05 12:10 ` [PATCHv2] " Jiri Olsa
2019-07-05 17:24 ` Jakub Kicinski
2019-07-05 17:26 ` Quentin Monnet [this message]
2019-07-05 22:00 ` Daniel Borkmann
2019-07-09 17:53 ` Jiri Olsa
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