Re: Driver-Core: devtmpfs - reset inode permissions beforeunlinking

From: Henrique de Moraes Holschuh
Date: Thu Jan 14 2010 - 16:07:52 EST

On Thu, 14 Jan 2010, Kay Sievers wrote:
> On Thu, Jan 14, 2010 at 21:53, Henrique de Moraes Holschuh
> <hmh@xxxxxxxxxx> wrote:
> > On Wed, 13 Jan 2010, Kay Sievers wrote:
> >> across the device lifetime by creating hardlinks, in the unusual case
> >> that there is a user-writable directory on the same filesystem.
> >
> > Does a tmpfs mounted in /dev/shm count as "user-writable directory on the
> > same filesystem" ?
> Not if it's a separate tmpfs mount, which is recommended. Only if it's
> just a plain directory on the /dev filesystem.

Yeah, I noticed the abusurdity of my question when I re-read it, thanks for
being kind in the reply.

That said, this does fix a possible security problem when a misconfigured
system is used, and the fix looks rather simple... Can it go to -stable
eventually, even if it is months in the future, after it gets some testing
in .34 ? Minor problems are still problems...

"One disk to rule them all, One disk to find them. One disk to bring
them all and in the darkness grind them. In the Land of Redmond
where the shadows lie." -- The Silicon Valley Tarot
Henrique Holschuh
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