fde-glibc.c bug

Ulrich Drepper drepper@redhat.com
Tue Jul 3 11:40:00 GMT 2001


Richard Henderson <rth@redhat.com> writes:

> How about a for_each_dso type function that took a callback, takes
> care of the locking, passes the link_map and mapping bounds?  The
> callback returns 0 to keep searching, non-zero is passed back to
> the caller.

That's more reasonable but passing the link_map is still too
dangerous.  The callbacks mustn't change anything.

Therefore it is necessary in such a situation to define a new data
structure which contains the needed information and pass a pointer to
this structure to the callback.  The data structure is an automatic
variable in the iterator and therefore changing it has no effect.

And yes, such a solution is the only way to ensure proper locking
(means, getting the load/unload mutex of ld.so).

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