On 02/17/15 at 11:22pm, Yinghai Lu wrote: > On Tue, Feb 10, 2015 at 10:11 PM, Baoquan He <b...@redhat.com> wrote: > > Hi Yinghai, > > > > Could you please help to have a look at a problem which I encountered? > > > > I am trying to make kaslr randomize on both kernel physical and virtual > > address separately. Now the separate randomization has been done, > > kernel physical address can be randomized to [16M, 4G], and virtual > > address can be randomzed to [16M, 1G]. Below is the post. > > http://thread.gmane.org/gmane.linux.kernel/1870532 > > > > Now I am trying to make kernel physical address randomize anywhere, not > > limited to below 4G. As you know in arch/x86/boot/compressed/head_64.S a > > identity mapping of 0~4G has been built, for address above 4G I added an > > IDT and #PF handler. Then I hardcoded the output address of > > choose_kernel_location as 5G, the #PF handler worked, however it will > > reboot in arch/x86/kernel/head_64.S. > > For 64bit, I'd like to see bootloader could load kernel to random hw address. > > otherwise you will need to set another ident mapping for new range.
Hi Yinghai, I am sorry I didn't get what you mean. I have tried to set another ident mapping for new range and it is successful seeing from debug message printing. However it always reboot because of GPF. That's why I made that small debug patch which add another 4G ident mapping and hardcoded to put kernel between 4G and 8G. Could you say more of it? Or which direction should I go? Thanks a lot for your help! Thanks Baoquan > > Thanks > > Yinghai -- 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/
