RFC: Change readelf/objdump to automatically follow debug links

[Nick Clifton]

Hi Florian,

>>    The patch adds a new configure time option
>>    --enable-follow-debugs-links=[yes|no] which can be used to set the
>>    default behaviour for both objdump and readelf.  If the option is
>>    not used, the default is to follow the links.
> 
> What happens if the debuglink contains '/'?  Maybe it's prudent to
> restrict loading of debuginfo data if it comes from the system default
> location.

Hmm, this could pose problems.  There are binaries with debug-links that
use absolute paths that are not rooted in system directories, but which
are still valid.  For example see:

   https://sourceware.org/bugzilla/show_bug.cgi?id=27391

Is there really a problem with following these paths ?  Could an attacker
really exploit this somehow ?

Cheers
   Nick