Messages in this thread | | | Date | Wed, 19 Apr 2006 14:38:46 -0700 | From | Andrew Morton <> | Subject | Re: [RFC] copy_from_user races with readpage |
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Andrew Morton <akpm@osdl.org> wrote: > > The application is being a bit silly, because the read will return > indeterminate results depending on whether it gets there before or after > the write. But that's assuming that the read is reading the part of the > page which the writer is writing. If the reader is reading bytes 1000-1010 > and the writer is writing bytes 990-1000 then the reader is being non-silly > and would be justifiably surprised to see zeroes. >
No, that's wrong, isn't it? If the reader is reading parts of the page which the writer isn't writing then __copy_from_user_inatomic() won't touch that part of the page.
So it's only the SillyApp which we're dealing with here.
So hrm. Yes, I guess we should still fix it. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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