Re: Can LD_PRELOAD set different symbol definitions for shared objects and executable?

[Florian Weimer <fweimer@redhat.com>]

* Fengkai Sun:

> Hi Florian,
>
> Thanks for your help as always.
>
> I've done some research on LD_AUDIT interfaces, and found it very useful to me. However, I
> had some problems when implementing a separate malloc for executable and shared
> objects:
>
> I use la_symbind64 to monitor symbol binding. The pseudocode is as follows:
> IF symname == "malloc" AND refcook == "shared objects"
>     RETURN custom_malloc
> ELSE
>     RETURN malloc
>
> Then I discovered I have no way to get the address of custom malloc in
> the audit library...

Hmm, malloc may be very special here because ld.so and libc.so in the
base namespace really must use the same malloc, or things will fall
apart.  In principle this code should work, and I expect with a lot of
care, it can be made to work for malloc as well.

Thanks,
Florian