Messages in this thread | | | Subject | Re: AUDIT: copy_from_user is a deathtrap. | Date | Tue, 21 May 2002 22:44:42 +0100 (BST) | From | Alan Cox <> |
| |
> So if you pass bad pointer to read(), why would you expect "number of > bytes read" return? Its true that kernel can't simply not return
Because the standard says either you return the errorcode and no data is transferred or for a partial I/O you return how much was done. Its not neccessarily about accuracy either. If you do a 4k copy_from_user and error after for some reason returning -Esomething thats fine providing you didnt do anything that consumed data or shifted the file position etc - 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/
| |