Error about "somebody tries to fake us!"

[li94575]

Thank you for your reply！

At 2014-10-14 19:08:17, "Stefan Kalkowski" <stefan.kalkowski at ...1...> wrote:

>Hi,


>I assume that your message buffer when sending a message to the server
>is corrupt, so that it contains a "0x4" as first word within the
>message. Although it is not impossible that we've a general bug in the
>base-foc code, we didn't observed such behavior in the past, though we
>test it heavily regularly. Therefore I think you've a memory corruption
>problem within your client, or did you also touched other code (e.g.:
>something in the parent tree of your client). Where is your connection
>initiated, within the BSS segment, heap, or stack?

The location of the connection is at “.../ports-foc/src/Lib/L4lx/Genode_i2c.cc”, like this:


static I2C::Connection *i2c() {
	static bool initialized = false;
	static I2C::Connection *i = 0;
	if (!initialized) {
		try {
			static I2C::Connection t;
			i = &t;
		} catch(...) {}
		initialized = true;
	}
	return i;
}


>Maybe you can provide some code snippet that helps to reproduce the problem?



The frequency of this error is not very high, sometimes several times a day, sometimes not once a week. 
So, it is difficult to determine which part of the code causes the error. Ourselves also don't know how to 
reproduce the error. Now, the error is mainly printed by I2C driver, also by some other drivers,such as 
Modem driver. The client is l4android.


When the error occurs, there is a phenomenon that the ID on server side is always "0x4", no matter what 
value of the label is.




>Regards
>Stefan
>
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>
>-- 
>Stefan Kalkowski
>Genode Labs
>
>http://www.genode-labs.com/ · http://genode.org/
>
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