On Tue, Jul 30, 2013 at 10:37:40 +0100, Daniel Berrange wrote:
On Tue, Jul 30, 2013 at 11:29:11AM +0200, Jiri Denemark wrote:
This fixes vircgrouptest when run in a sandbox which already overrides open() and others.
In general I think that having multiple LD_PRELOADS overriding the same symbols may well lead to pain.
We try to make it at least chain up the libraries by using the 'RTLD_NEXT' handle when looking up the "real" symbol, which should make it forward to the next preloaded library. From the sound of it, your sandbox tool isn't using RTLD_NEXT, causing the libvirt override to be skipped when the order was reversed.
I did some investigation and the sandbox actually uses RTLD_NEXT but unfortunately searches for full symbols including their versions. Thus, e.g., our implementation of fopen() is ignored because the sandbox wants fopen@GLIBC_2.2.5.
ACK
Thanks and pushed. Jirka