So here's a second posting of the VMA based LDT implementation; now without most of the crazy. I took out the write fault handler and the magic LAR touching code. Additionally there are a bunch of patches that address generic vm issue. - gup() access control; In specific I looked at accessing !_PAGE_USER pages because these patches rely on not being able to do that. - special mappings; A whole bunch of mmap ops don't make sense on special mappings so disallow them. Both things make sense independent of the rest of the series. Similarly, the patches that kill that rediculous LDT inherit on exec() are also unquestionably good. So I think at least the first 6 patches are good, irrespective of the VMA approach. On the whole VMA approach, Andy I know you hate it with a passion, but I really rather like how it ties the LDT to the process that it belongs to and it reduces the amount of 'special' pages in the whole PTI mapping. I'm not the one going to make the decision on this; but I figured I at least post a version without the obvious crap parts of the last one. Note: if we were to also disallow munmap() for special mappings (which I suppose makes perfect sense) then we could further reduce the actual LDT code (we'd no longer need the sm::close callback and related things). -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
