On Mon, Oct 11, 2004 at 14:45:59 +0530, Mandeep Sandhu wrote: > On Mon, 2004-10-11 at 14:43, Jan Hudec wrote: > > On Mon, Oct 11, 2004 at 14:34:50 +0530, Mandeep Sandhu wrote: > > > won't a page fault be generated in case the page u r trying to > > > copy to is not in the mem???????? > > > > In kernel mode, page faults must be handled manualy. The trap just gives > > an oops if it happens in kernel mode. > > > > right, then we can't simply use memcpy to copy data to user-space > x86 or not? Right. We can't. And eg. in user-mode-linux in SKAS mode, not only the user memory is not mapped, but the address spaces of kernel and user mode overlap! Using that for debugging is really a good test that you have copy_to/from_user in the right places. ------------------------------------------------------------------------------- Jan 'Bulb' Hudec <bulb@xxxxxx>
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