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SubjectRe: 2.3.30 linuxNFS import is broken (Screwed up NFS/RPC credentials)
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Alexander Viro <viro@math.psu.edu> said:

[...]

> ... and? Suppose that users foo and bar are accessing the file. foo has
> credentials alive and well, but bar got them revoked. Now, foo accesses a
> piece of file. Data is read and cached. Into the inode's i_data. Where bar
> can pick them without any calls to server. See the problem? We are
> _already_ sharing the cache. And since file permissions are _not_
> range-based...

This is what happens with normal filesystems too: If I open the file, and
you then remove my rights on it, I still can putz around. I won't be able
to open it again, that's all.
--
Dr. Horst H. von Brand mailto:vonbrand@inf.utfsm.cl
Departamento de Informatica Fono: +56 32 654431
Universidad Tecnica Federico Santa Maria +56 32 654239
Casilla 110-V, Valparaiso, Chile Fax: +56 32 797513

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