Re: [Qemu-devel] [PATCH] Convert fprintf() to error_request(): virtio-9p

[Stefan Hajnoczi <stefanha@gmail.com>]

On Wed, Dec 1, 2010 at 6:01 PM, Venkateswararao Jujjuri (JV)
<jvrao@linux.vnet.ibm.com> wrote:
> On 12/1/2010 1:35 AM, Stefan Hajnoczi wrote:
>> On Tue, Nov 30, 2010 at 9:52 AM, Sanchit Garg
>> <sancgarg@linux.vnet.ibm.com> wrote:
>>> @@ -3707,19 +3708,19 @@ VirtIODevice *virtio_9p_init(DeviceState *dev, V9fsConf *conf)
>>>         s->ctx.fs_sm = SM_NONE;
>>>         s->ctx.xops = none_xattr_ops;
>>>     } else {
>>> -        fprintf(stderr, "Default to security_model=none. You may want"
>>> +        error_report("Default to security_model=none. You may want"
>>>                 " enable advanced security model using "
>>>                 "security option:\n\t security_model=passthrough \n\t "
>>> -                "security_model=mapped\n");
>>> +                "security_model=mapped");
>>>         s->ctx.fs_sm = SM_NONE;
>>>         s->ctx.xops = none_xattr_ops;
>>>     }
>>
>> It would be safer to avoid embedded \n\t.  Although I can't find
>> anything prohibiting it in the source, no other place does this.
>> Program output is easier to handle when constrained to one message per
>> line.  Security issues arise when unfiltered inputs are logged *and*
>> linebreaks are allowed because malicious input can inject fake log
>> lines.  Let's avoid getting into the habit.
>
> Embedded breaks were introduced to give more readable and formatted output.
> Stafan do you suggest to print the entire message in one line?

Yes, exactly.

Stefan