> On Dec 14, 2017, at 2:15 PM, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> wrote: > >> On Thu, Dec 14, 2017 at 2:11 PM, Andy Lutomirski <luto@xxxxxxxxxxxxxx> wrote: >> >> That seems to rather defeat the point of using a VMA, though. > > There never was any point in using a VMA per se. > > The point was always to just map the damn thing in the user page > tables, wasn't it? > > The vma bit was just an implementation detail. And all this is why I dislike using a VMA. My patch puts it at a negative address. We could just as easily put it just above TASK_SIZE_MAX, but I'm a bit nervous about bugs that overrun an access_ok check by a small amount. IIRC I found one of those in the net code once, and I didn't look very hard. -- 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
