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SubjectRe: Subtle MM bug
>>>>> " " == Stephen C Tweedie <> writes:

> 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.

What's wrong with copy-on-write style semantics? IOW, anyone who
wants to change the credentials needs to make a private copy of the
existing structure first.

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