Hi Eugene, Eugene Teo [2007-07-29 21:03 +0800]: > >> Also, it is probably good to think how we can "drop privileges" while > >> piping > >> the core dump output to an external program. A malicious user can > >> potentially > >> use it as a possible backdoor since anything that is executed by > >> "|program" will > >> be executed with root privileges. > >> > > It was my understanding that apport already did this. > > I haven't looked at apport yet, but are you talking about the userspace > portion of > apport or the kernel changes in the Ubuntu kernel?
Similarly to Neil's patches, the Ubuntu kernel calls the userspace helper as root, too. Apport drops privileges to the target process as soon as possible (there are a few things it needs to do before, like opening an fd to the crash file in /var/crash/ if that is only writeable by root). Martin -- Martin Pitt http://www.piware.de Ubuntu Developer http://www.ubuntu.com Debian Developer http://www.debian.org
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