Messages in this thread | | | Date | Tue, 17 Feb 2015 23:22:39 -0800 | Subject | Re: [PATCH] x86, boot: Allow 64bit EFI kernel to be loaded above 4G | From | Yinghai Lu <> |
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On Tue, Feb 10, 2015 at 10:11 PM, Baoquan He <bhe@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.
Thanks
Yinghai
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