In a vhost environment, it seems tat any script can flush all existing 
sessions that use the common save_path by lowering his gc_maxlifetime and 
seting his gc_probability to 100%.

Both gc_maxlifetime and gc_probability  values are INI_ALL,  even when the 
sessio.save_path is set to everybody's cauldron, on /tmp.
This will make possible for any vhost to block other vhosts' session 
management.

Maybe it should be INI_ALL *only* when a particular save_path is specified, 
so that will influence only his sessions? 
Or does it exist some fault setting by which anyone could have the privileges 
to force gc  on some other vhosts' session by specifying *also*  the other 
vhost's save_path?

Giancarlo


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