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Re: COSEINC Linux Advisory #1: Linux Kernel Parent Process Death Signal

from [Wojciech Purczynski] Network Security [Permanent Link]
Subject: Re: COSEINC Linux Advisory #1: Linux Kernel Parent Process Death Signal Vulnerability
Date: Tue, 14 Aug 2007 23:03:46 +0200 (CEST) 

Small correction - I forgot to add setuid(0) ;)

        PARENT          CHILD
        ----------------------------------------------------------------
        fork()
                        prctl(PR_SET_PDEATHSIG)
                        execve("/bin/setuid-binary")
                        setuid(0)
        exit()'ed or killed
                        child receives NO signal this time


        PARENT          CHILD
        ----------------------------------------------------------------
        fork()
                        prctl(PR_SET_PDEATHSIG)
                        execve("/bin/setuid-binary")
                        setuid(0)
        execve("/bin/setuid-binary")
        exit()'ed or killed
                        privileged process receives the signal
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