On 6 January 2015 at 15:20, Pavel Machek <pa...@ucw.cz> wrote: > On Mon 2015-01-05 19:23:29, One Thousand Gnomes wrote: > > > In the meantime, I created test that actually uses physical memory, > > > 8MB apart, as described in some footnote. It is attached. It should > > > work, but it needs boot with specific config options and specific > > > kernel parameters. > > > > Why not just use hugepages. You know the alignment guarantees for 1GB > > pages and that means you don't even need to be root > > > > In fact - should we be disabling 1GB huge page support by default at this > > point, at least on non ECC boxes ? > > Actually, I could not get my test code to run; and as code from > > https://github.com/mseaborn/rowhammer-test > > reproduces issue for me, I stopped trying. I could not get it to > damage memory of other process than itself (but that should be > possible), I guess that's next thing to try.
FYI, rowhammer-induced bit flips do turn out to be exploitable. Here are the results of my research on this: http://googleprojectzero.blogspot.com/2015/03/exploiting-dram-rowhammer-bug-to-gain.html Cheers, Mark -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
