Re: [RESEND] [PATCH] VFS: make file->f_pos access atomic on 32bit arch

[Valdis . Kletnieks]

On Thu, 09 Oct 2008 14:23:19 +0200, Pavel Machek said:

> We have append-only files, and normal users should not be able to work
> around that restriction.

Can you give an example of two *plausible* starting offsets, and 2 write
lengths, which when subjected to this race manage to override the append-only
attribute? I believe somebody already checked the code, and for append-only
we force the offset in the kernel for *each* write.

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