2019-07-05 10:24 UTC-0700 ~ Jakub Kicinski <jakub.kicinski@xxxxxxxxxxxxx>
> 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@xxxxxxxxxx>
>> Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx>
>
> 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@xxxxxxxxxxxxx>
> Reviewed-by: Jakub Kicinski <jakub.kicinski@xxxxxxxxxxxxx>
>
