Linda Walsh writes:
> Please consider the attached patch for inclusion into 2.3.99pre5.
I'd really like to know why you think you need _two_ system calls
and a capability bit. These are scarce resources.
#define setluid(x) sys_luid(x)
#define getluid() sys_luid((uid_t)-1)
uid_t sys_luid(uid_t arg){
uid_t old = current->luid;
if(old == (uid_t)-1) current->luid = arg;
return old;
}
As far as I can tell, this simple code does it all. On a system that
sets the LUID, users will never be able to change it. This meets the
requirement with a minimum of code and nothing wasted.
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