Messages in this thread | | | From | David Woodhouse <> | Subject | Re: AUDIT of 2.5.15 copy_to/from_user | Date | Sun, 19 May 2002 18:52:36 +0100 |
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alan@lxorguk.ukuu.org.uk said: > > On the emu10k1 driver we use access_ok(VERIFY_READ) once at the > > beginning of the write() routine to check we can access the user buffer. > > After that we always use __copy_from_user() and we trust it not to fail. > > Is this correct, or not?
> This is correct
Even if another thread unmaps the page we were trying to read from between the access_ok() and the actual copy?
-- dwmw2
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