On Wed, Dec 13, 2017 at 10:08 AM, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> wrote: > On Wed, Dec 13, 2017 at 7:54 AM, Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote: >> >> Which is why get_user_pages() _should_ enforce this. >> >> What use are protection keys if you can trivially circumvent them? > > No, we will *not* worry about protection keys in get_user_pages(). > Hmm. If I goof some pointer and pass that bogus pointer to read(2), and I'm using pkey to protect my mmapped database, I think i'd rather that read(2) fail. Sure, pkey is trivially circumventable using wrpkru or mprotect, but those are obvious dangerous functions. -- 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>
