Messages in this thread | | | Date | Thu, 16 May 2002 23:56:59 +0000 | From | Pavel Machek <> | Subject | Re: AUDIT: copy_from_user is a deathtrap. |
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Hi!
> > But as we all know, it is harder to remove a feature from Linux, than > > to get the camel book through the eye of a needle (or something). > > It's possible that I'm too tired to have grasped this, but if I have, > you're all wet. In all cases, read needs to return the number of bytes > successfully moved. If you ask for N and 1/2 of the way through N you > are going to get a fault, and you return SEGFAULT, now how can I ever > find out that N/2 bytes actually made it out to me? I want to know that. > If you are arguing that return N/2 is wrong, you are incorrect.
Imagine "I reallyu want to know how much memory memcpy() copied!". It is as unreasonable as that. Pavel -- Philips Velo 1: 1"x4"x8", 300gram, 60, 12MB, 40bogomips, linux, mutt, details at http://atrey.karlin.mff.cuni.cz/~pavel/velo/index.html.
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