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[Dazuko-devel] RE: trusting relatives

From: Tikka, Sami
Subject: [Dazuko-devel] RE: trusting relatives
Date: Tue, 3 May 2005 12:34:05 +0300

>-----Original Message-----
>From: John Ogness [mailto:address@hidden 

>@sami.tikka: This should be exactly what you have been looking 
>for. I am quite happy with how it has turned out. This can be 
>very useful for applications that use other external processes 
>or helper-apps (and the helper-apps are not Dazuko-aware).

Woohoo! This looks very nice! Your current implementation matches, at least
conceptually, pretty closely the trusted pid patch I originally posted. You
have added some extra checks for the situation where another process has
taken the same pid. I am happy!

I'd like to clarify how the "relatives" check is done. It seems to me that
the while loop below would step up thru the process family hierarchy until it
finds a process that is its own parent. What kind of a process is that?

static inline struct task_struct* get_root_parent(struct task_struct *p)
        struct task_struct      *ts = p;

        while (1)
                if (ts == NULL)
                        return NULL;

                if (ts->p_pptr == NULL)
                        return ts;

                if (ts == ts->p_pptr)
                        return ts;

                if (ts->p_pptr == ts->p_pptr->p_pptr)
                        return ts;

                ts = ts->p_pptr;

Sami Tikka                tel. +358 9 2520 5115 
senior software engineer  fax. +358 9 2520 5014
                          mobile +358 40 7379388
F-Secure Corporation      http://www.f-secure.com

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