Design goals of the dynamic loader.

[Carlos O'Donell]

On 07/20/2015 09:51 AM, Siddhesh Poyarekar wrote:
> On Mon, Jul 20, 2015 at 08:56:08AM -0400, Carlos O'Donell wrote:
>> I agree completely, but we would need to replace it with something like
>> stap-based probe tracing which compiles to nop's normally but allows an
>> external program like systemtrace to be used to trace library loading with
>> all the same detailed data as before but for developers only (and ship
>> the stap script with libc.so.6).
> 
> I don't understand - we already have stap probe points in ld.so that
> do this and we also have LD_DEBUG, which gives the ability to trace
> ld.so activities the conventional way, i.e. by dumping to a file or
> stderr.  Neither have anything to do with ldd.

The latter two are code in the core loader that are more difficult
to audit than stap-based probes? If we removed all trace an debug code
from and moved to stap, we would have something that is even easier to audit?

Cheers,
Carlos.