All right, feel free to flame me a LOT for what follows :)
There are situations (at least I could think of some :) where it is necessary
to change a running process's credentials. I'm thinking specifically of the
effective UID and GID, but I might have to tinker with the real and saved
UID's, too.
As far as I can see, FreeBSD (nor any other Unix system I'm aware of) does not
provide a way to do this (short of writing to /dev/kmem ;). If a new syscall
should be implemented to this end, would it be enough to change a struct
proc's p_cred member, its pc_ucred and such, or would that raise hell all over
the process table? I see the comments mentioning 'possibly shared'
credentials - does this mean that I can inadvertently change the credentials
of a whole process children/siblings tree? That does not sound too good -
how do I go about taking a single process's credentials out - just allocate
a new pcred/ucred structure?
And yes, I'm quite aware of the security implications of something like
that.. let's just say I like playing with fire in a controlled environment :)
(famous last words..)
G'luck,
Peter
--
If the meanings of 'true' and 'false' were switched, then this sentence wouldn't be
false.
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