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SubjectRe: Subtle MM bug


On Thu, 11 Jan 2001, Stephen C. Tweedie wrote:

> Hi,
>
> On Wed, Jan 10, 2001 at 12:11:16PM -0800, Linus Torvalds wrote:
> >
> > That said, we can easily support the notion of CLONE_CRED if we absolutely
> > have to (and sane people just shouldn't use it), so if somebody wants to
> > work on this for 2.5.x...
>
> But is it really worth the pain? I'd hate to have to audit the entire
> VFS to make sure that it works if another thread changes our
> credentials in the middle of a syscall, so we either end up having to
> lock the credentials over every VFS syscall, or take a copy of the
> credentials and pass it through every VFS internal call that we make.

COW. Pthreads are simply irrelevant here - if you want set*id in one
thread to change the credentials of the rest you can do it in libpthreads.

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