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Re: [Xen-devel] [PATCH v3 23/27] x86/modules: Adapt module loading for PIE support
- To: Thomas Garnier <thgarnie@xxxxxxxxxx>
- From: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
- Date: Wed, 23 May 2018 16:07:24 -0700
- Cc: Kate Stewart <kstewart@xxxxxxxxxxxxxxxxxxx>, Nicolas Pitre <nicolas.pitre@xxxxxxxxxx>, the arch/x86 maintainers <x86@xxxxxxxxxx>, Sergey Senozhatsky <sergey.senozhatsky.work@xxxxxxxxx>, Petr Mladek <pmladek@xxxxxxxx>, Len Brown <len.brown@xxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Yonghong Song <yhs@xxxxxx>, Christopher Li <sparse@xxxxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, Dominik Brodowski <linux@xxxxxxxxxxxxxxxxxxxx>, LKML <linux-kernel@xxxxxxxxxxxxxxx>, Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxx>, Pavel Machek <pavel@xxxxxx>, "H . Peter Anvin" <hpa@xxxxxxxxx>, Kernel Hardening <kernel-hardening@xxxxxxxxxxxxxxxxxx>, Christoph Lameter <cl@xxxxxxxxx>, Alok Kataria <akataria@xxxxxxxxxx>, Linux Doc Mailing List <linux-doc@xxxxxxxxxxxxxxx>, linux-arch <linux-arch@xxxxxxxxxxxxxxx>, Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>, Baoquan He <bhe@xxxxxxxxxx>, David Woodhouse <dwmw@xxxxxxxxxxxx>, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, Radim Krčmář <rkrcmar@xxxxxxxxxx>, Daniel Micay <danielmicay@xxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Sparse Mailing-list <linux-sparse@xxxxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Jan Kiszka <jan.kiszka@xxxxxxxxxxx>, Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>, Borislav Petkov <bp@xxxxxxx>, Alexey Dobriyan <adobriyan@xxxxxxxxx>, kvm list <kvm@xxxxxxxxxxxxxxx>, Linux Crypto Mailing List <linux-crypto@xxxxxxxxxxxxxxx>, Tom Lendacky <thomas.lendacky@xxxxxxx>, Rik van Riel <riel@xxxxxxxxxx>, "Jan H . Schönherr" <jschoenh@xxxxxxxxx>, Kees Cook <keescook@xxxxxxxxxxxx>, Arnd Bergmann <arnd@xxxxxxxx>, Linux PM list <linux-pm@xxxxxxxxxxxxxxx>, Ricardo Neri <ricardo.neri-calderon@xxxxxxxxxxxxxxx>, "H . J . Lu" <hjl.tools@xxxxxxxxx>, Matthias Kaehlcke <mka@xxxxxxxxxxxx>, Steven Rostedt <rostedt@xxxxxxxxxxx>, Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>, Dennis Zhou <dennisszhou@xxxxxxxxx>, Cao jin <caoj.fnst@xxxxxxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Nicholas Piggin <npiggin@xxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxx>, Josh Poimboeuf <jpoimboe@xxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx, Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, Dou Liyang <douly.fnst@xxxxxxxxxxxxxx>, "Paul E . McKenney" <paulmck@xxxxxxxxxxxxxxxxxx>, Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx>, Francis Deslauriers <francis.deslauriers@xxxxxxxxxxxx>, Jonathan Corbet <corbet@xxxxxxx>, "Rafael J. Wysocki" <rjw@xxxxxxxxxxxxx>, Jason Baron <jbaron@xxxxxxxxxx>, Jia Zhang <qianyue.zj@xxxxxxxxxxxxxxx>, "Luis R . Rodriguez" <mcgrof@xxxxxxxxxx>, Lukas Wunner <lukas@xxxxxxxxx>, Masami Hiramatsu <mhiramat@xxxxxxxxxx>, Philippe Ombredanne <pombredanne@xxxxxxxx>, Tejun Heo <tj@xxxxxxxxxx>, Paolo Bonzini <pbonzini@xxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, "David S . Miller" <davem@xxxxxxxxxxxxx>, "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>, Joerg Roedel <joro@xxxxxxxxxx>
- Delivery-date: Wed, 23 May 2018 23:08:18 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 05/23/2018 03:01 PM, Thomas Garnier wrote:
> On Wed, May 23, 2018 at 2:27 PM Randy Dunlap <rdunlap@xxxxxxxxxxxxx> wrote:
>
>> Hi,
>
>> (for several patches in this series:)
>> The commit message is confusing. See below.
>
> Thanks for the edits, I will change the different commit messages.
>
>
>
>> On 05/23/2018 12:54 PM, Thomas Garnier wrote:
>>> Adapt module loading to support PIE relocations. Generate dynamic GOT if
>>> a symbol requires it but no entry exist in the kernel GOT.
>
>> exists
>
>>>
>>> Position Independent Executable (PIE) support will allow to extended the
>
>> will allow us to extend
> the
>
>>> KASLR randomization range below the -2G memory limit.
>
>> Does that say "below th negative 2G memory limit"?
>> I don't get it.
>
> Yes, below 0xffffffff80000000 basically. I think I will just say that.
Yes, please, that's much better.
>
>
>>>
>>> Signed-off-by: Thomas Garnier <thgarnie@xxxxxxxxxx>
>>> ---
>>> arch/x86/Makefile | 4 +
>>> arch/x86/include/asm/module.h | 11 ++
>>> arch/x86/include/asm/sections.h | 4 +
>>> arch/x86/kernel/module.c | 181 +++++++++++++++++++++++++++++++-
>>> arch/x86/kernel/module.lds | 3 +
>>> 5 files changed, 198 insertions(+), 5 deletions(-)
>>> create mode 100644 arch/x86/kernel/module.lds
>
>
>> Thanks,
>> --
>> ~Randy
>
>
>
--
~Randy
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