Messages in this thread | | | Subject | Re: AUDIT: copy_from_user is a deathtrap. | Date | Wed, 22 May 2002 16:27:33 +0100 (BST) | From | Alan Cox <> |
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> > must return PAGE_SIZE on an error. What it seems to say is that it if an error > > is reported then no data got written down the actual pipe itself. Putting > > 4K into the pipe then reporting Esomething is not allowed. Copying 4K into > > a buffer faulting and erroring with Efoo then throwing away the buffer is > > allowed > > So... Is copy_to_user allowed to copy more than it actually reported? > Because if so, it might return 0/-EFAULT as well ;-).
The specification defines the API not the implementation. It only matters if the user can't tell. 0/-EFAULT would be wrong as that is EOF. 0/0 or -1/Efoo. - 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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