Re-send [PATCH] : Validating address in runtime

[Wenji Huang]

Ananth N Mavinakayanahalli wrote:
> On Mon, Jun 23, 2008 at 10:54:08AM +0800, Wenji Huang wrote:
>> Hi,
> 
> Hi Wenji,
> 
>> Regarding PR6646, seems no good way to solve it. I just think maybe double 
>> checking the address in runtime to make things safer.
>>
>> This patch adds validating address vs name mapping in runtime for several 
>> symbols which are used in initializing process.	So kernel oops could be 
>> early avoided in case of incorrect vmlinux or wrong address.
> 
> Agreed that the oops will be avoided, but this will just shift the
> problem from 'runtime' to compile time. It still won't help SystemTap
> working.

The checking process happens in runtime. sprint_symbol is from 
kallsyms.c, to get the name according to address from /proc/kallsyms in 
runtime kernel.

Yeah, stap will exit if the checking fails.

> 
> In some ways, its better to get an oops just to be able to see if the
> failure modes are the same or not.
> 
> Ananth
> 

Regards,
Wenji