On Sunday 17 February 2008 23:12:35 Robert Buchholz wrote:
> On Sunday, 17. February 2008, Eduardo Tongson wrote:
> > What specific kernel knowledge is needed to get a Kernel advisory up
> > and running ?
> Between becoming aware of a vulnerability in Linux and drafting an advisory
> for one or all kernel sources comes the part where you review which
> versions of which kernel sources are affected and unaffected. You also
> need to pay attention to specifics of the added patchsets, which might
> duplicate vulnerabilities.
> Parts of the job can indeed be done without Kernel and C knowledge, but
> some cannot. So if we draft a new kernel security *team*, people without C
> and kernel knowledge are helpful -- some others need to have it, though.
To be honest, 99% of what is done in the kernel security team can be done with
no C knowledge at all.
I'm not an expert C person - far from it - but I eventually became the head of
Kernel Security until I retired a few months ago.
Most of it is bug handling. The major problem is a social, not a technical
one. Because of the manner in which our kernels are organized, a single
vulnerability involves checking upstream version numbers, coordinating them
into our downstream version numbers for all sources, checking to see if the
sources are effected, figuring out who to CC for the bugs, then harassing
them until they do it.
Unlike other security sources, any attempt to hardmask the package is shutdown
instantly. The chaos that would result from a kernel hardmask, even one of
the lesser used ones, caused me to only successfully order one over my entire
career in Gentoo Kernsec... even though more around 30 would have been
needed. It is not infrequently that bugs will last six months without any
action coming about them, and users are blissfully unaware.
I am happy to give my input as the former head of Kernel Security, but it is
my personal opinion that any advances in kernel security will require the
full cooperation of security, and letting the head of kernel security be able
to actually enforce threats, as that seems to be the only way bugs ever get
resolved. Pleading didn't work - I tried.
Gentoo Developer Emeritus
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