Messages in this thread | | | Date | Tue, 10 Apr 2001 06:41:28 -0400 | From | Jakub Jelinek <> | Subject | Re: [CHECKER] amusing copy_from_user bug |
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On Tue, Apr 10, 2001 at 03:11:05AM -0700, Dawson Engler wrote: > As a side question: is it still true that verify_area's must be done before > any use of __put_user/__get_user/__copy_from_user/etc?
I believe so, at least in generic code. In architecture specific code (non-i386) it is usually sufficient just to do one put_user/get_user/copy_from_user and then do the rest of __put_user/__get_user etc. from nearby area (<4K is safe e.g. on sparc) and some architectures don't care at all, because verify_area is a noop (sparc64).
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