From: "H. Peter Anvin" <hpa@zytor.com>
To: Thomas Garnier <thgarnie@google.com>
Cc: "Michal Hocko" <mhocko@suse.com>,
"kvm list" <kvm@vger.kernel.org>,
"Radim Krčmář" <rkrcmar@redhat.com>,
"Peter Zijlstra" <peterz@infradead.org>,
"Catalin Marinas" <catalin.marinas@arm.com>,
"Christopher Li" <sparse@chrisli.org>,
"the arch/x86 maintainers" <x86@kernel.org>,
"Paul Gortmaker" <paul.gortmaker@windriver.com>,
"Pavel Machek" <pavel@ucw.cz>,
"Kernel Hardening" <kernel-hardening@lists.openwall.com>,
"Christoph Lameter" <cl@linux.com>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Chris Metcalf" <cmetcalf@mellanox.com>,
linux-arch <linux-arch@vger.kernel.org>,
"Herbert Xu" <herbert@gondor.apana.org.au>,
"Daniel Borkmann" <daniel@iogearbox.net>,
"Matthew Wilcox" <mawilcox@microsoft.com>,
"Joerg Roedel" <joro@8bytes.org>,
"Peter Foley" <pefoley2@pefoley.com>,
"Christian Borntraeger" <borntraeger@de.ibm.com>,
linux-sparse@vger.kernel.org,
"Matthias Kaehlcke" <mka@chromium.org>
Subject: Re: [RFC 20/22] x86/relocs: Add option to generate 64-bit relocations
Date: Wed, 19 Jul 2017 16:08:27 -0700 [thread overview]
Message-ID: <89b77a4a-ef77-f746-1ae5-79bfc0d12ab0__8083.27225172452$1500507166$gmane$org@zytor.com> (raw)
In-Reply-To: <CAJcbSZE3fQ5vgUm4648kwExY_-p7a3d+QdNQ8K8tbhZVhOHFtA@mail.gmail.com>
On 07/19/17 15:47, Thomas Garnier wrote:
> On Wed, Jul 19, 2017 at 3:33 PM, H. Peter Anvin <hpa@zytor.com> wrote:
>> On 07/18/17 15:33, Thomas Garnier wrote:
>>> The x86 relocation tool generates a list of 32-bit signed integers. There
>>> was no need to use 64-bit integers because all addresses where above the 2G
>>> top of the memory.
>>>
>>> This change add a large-reloc option to generate 64-bit unsigned integers.
>>> It can be used when the kernel plan to go below the top 2G and 32-bit
>>> integers are not enough.
>>
>> Why on Earth? This would only be necessary if the *kernel itself* was
>> more than 2G, which isn't going to happen for the forseeable future.
>
> Because the relocation integer is an absolute address, not an offset
> in the binary. Next iteration, I can try using a 32-bit offset for
> everyone.
It is an absolute address *as the kernel was originally linked*, for
obvious reasons.
-hpa
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next prev parent reply other threads:[~2017-07-19 23:31 UTC|newest]
Thread overview: 151+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-07-18 22:33 x86: PIE support and option to extend KASLR randomization Thomas Garnier
2017-07-18 22:33 ` [kernel-hardening] " Thomas Garnier
2017-07-18 22:33 ` [RFC 01/22] x86/crypto: Adapt assembly for PIE support Thomas Garnier
2017-07-18 22:33 ` [kernel-hardening] " Thomas Garnier
2017-07-18 22:33 ` Thomas Garnier
2017-07-18 22:33 ` [RFC 02/22] x86: Use symbol name on bug table " Thomas Garnier
2017-07-18 22:33 ` [kernel-hardening] " Thomas Garnier
2017-07-18 22:33 ` [RFC 03/22] x86: Use symbol name in jump " Thomas Garnier
2017-07-18 22:33 ` [kernel-hardening] " Thomas Garnier
2017-07-18 22:33 ` [RFC 04/22] x86: Add macro to get symbol address " Thomas Garnier
2017-07-18 22:33 ` [kernel-hardening] " Thomas Garnier
2017-07-18 22:33 ` [RFC 05/22] xen: Adapt assembly " Thomas Garnier
2017-07-18 22:33 ` [kernel-hardening] " Thomas Garnier
2017-07-18 22:33 ` [RFC 06/22] kvm: " Thomas Garnier
2017-07-18 22:33 ` [kernel-hardening] " Thomas Garnier
2017-07-19 2:49 ` Brian Gerst
2017-07-19 2:49 ` Brian Gerst
2017-07-19 2:49 ` [kernel-hardening] " Brian Gerst
2017-07-19 15:40 ` Thomas Garnier
2017-07-19 15:40 ` [kernel-hardening] " Thomas Garnier
2017-07-19 22:27 ` H. Peter Anvin
2017-07-19 22:27 ` H. Peter Anvin
2017-07-19 22:27 ` [kernel-hardening] " H. Peter Anvin
2017-07-19 22:44 ` Thomas Garnier
2017-07-19 22:44 ` [kernel-hardening] " Thomas Garnier
2017-07-19 22:44 ` Thomas Garnier
2017-07-19 22:58 ` Ard Biesheuvel
2017-07-19 22:58 ` Ard Biesheuvel
2017-07-19 22:58 ` [kernel-hardening] " Ard Biesheuvel
2017-07-19 23:47 ` H. Peter Anvin
2017-07-19 23:47 ` H. Peter Anvin
2017-07-19 23:47 ` H. Peter Anvin
2017-07-19 23:47 ` H. Peter Anvin
2017-07-19 23:47 ` H. Peter Anvin
2017-07-19 23:47 ` H. Peter Anvin
2017-07-19 23:47 ` H. Peter Anvin
2017-07-19 15:40 ` Thomas Garnier
2017-07-18 22:33 ` [RFC 07/22] x86: relocate_kernel - " Thomas Garnier
2017-07-18 22:33 ` [kernel-hardening] " Thomas Garnier
2017-07-19 22:58 ` H. Peter Anvin
2017-07-19 22:58 ` H. Peter Anvin
2017-07-19 22:58 ` [kernel-hardening] " H. Peter Anvin
2017-07-19 23:23 ` Thomas Garnier
2017-07-19 23:23 ` [kernel-hardening] " Thomas Garnier
2017-07-19 23:23 ` Thomas Garnier
2017-07-18 22:33 ` [RFC 08/22] x86/entry/64: " Thomas Garnier
2017-07-18 22:33 ` [kernel-hardening] " Thomas Garnier
2017-07-18 22:33 ` [RFC 09/22] x86: pm-trace - " Thomas Garnier
2017-07-18 22:33 ` [kernel-hardening] " Thomas Garnier
2017-07-18 22:33 ` [RFC 10/22] x86/CPU: " Thomas Garnier
2017-07-18 22:33 ` [kernel-hardening] " Thomas Garnier
2017-07-18 22:33 ` [RFC 11/22] x86/acpi: " Thomas Garnier
2017-07-18 22:33 ` [kernel-hardening] " Thomas Garnier
2017-07-18 22:33 ` [RFC 12/22] x86/boot/64: " Thomas Garnier
2017-07-18 22:33 ` [kernel-hardening] " Thomas Garnier
2017-07-18 22:33 ` [RFC 13/22] x86/power/64: " Thomas Garnier
2017-07-18 22:33 ` [kernel-hardening] " Thomas Garnier
2017-07-19 18:41 ` Pavel Machek
2017-07-19 18:41 ` [kernel-hardening] " Pavel Machek
2017-07-19 18:41 ` Pavel Machek
2017-07-18 22:33 ` [RFC 14/22] x86/paravirt: " Thomas Garnier
2017-07-18 22:33 ` [kernel-hardening] " Thomas Garnier
2017-07-18 22:33 ` [RFC 15/22] x86/boot/64: Use _text in a global " Thomas Garnier
2017-07-18 22:33 ` [kernel-hardening] " Thomas Garnier
2017-07-18 22:33 ` [RFC 16/22] x86/percpu: Adapt percpu " Thomas Garnier
2017-07-18 22:33 ` [kernel-hardening] " Thomas Garnier
2017-07-19 3:08 ` Brian Gerst
2017-07-19 3:08 ` [kernel-hardening] " Brian Gerst
2017-07-19 18:26 ` Thomas Garnier
2017-07-19 18:26 ` Thomas Garnier
2017-07-19 18:26 ` [kernel-hardening] " Thomas Garnier
2017-07-19 23:33 ` H. Peter Anvin
2017-07-19 23:33 ` H. Peter Anvin
2017-07-19 23:33 ` [kernel-hardening] " H. Peter Anvin
2017-07-20 2:21 ` H. Peter Anvin
2017-07-20 2:21 ` H. Peter Anvin
2017-07-20 2:21 ` [kernel-hardening] " H. Peter Anvin
2017-07-20 3:03 ` H. Peter Anvin
2017-07-20 3:03 ` H. Peter Anvin
2017-07-20 3:03 ` [kernel-hardening] " H. Peter Anvin
2017-07-20 14:26 ` Thomas Garnier
2017-07-20 14:26 ` [kernel-hardening] " Thomas Garnier
2017-08-02 16:42 ` Thomas Garnier
2017-08-02 16:42 ` Thomas Garnier
2017-08-02 16:42 ` [kernel-hardening] " Thomas Garnier
2017-08-02 16:56 ` Kees Cook
2017-08-02 16:56 ` [kernel-hardening] " Kees Cook
2017-08-02 18:05 ` Thomas Garnier
2017-08-02 18:05 ` [kernel-hardening] " Thomas Garnier
2017-08-02 18:05 ` Thomas Garnier
2017-08-02 16:56 ` Kees Cook
2017-07-20 14:26 ` Thomas Garnier
2017-07-19 3:08 ` Brian Gerst
2017-07-18 22:33 ` [RFC 17/22] compiler: Option to default to hidden symbols Thomas Garnier
2017-07-18 22:33 ` [kernel-hardening] " Thomas Garnier
2017-07-18 22:33 ` [RFC 18/22] x86/relocs: Handle DYN relocations for PIE support Thomas Garnier
2017-07-18 22:33 ` [kernel-hardening] " Thomas Garnier
2017-07-18 22:33 ` [RFC 19/22] x86/pie: Add option to build the kernel as PIE for x86_64 Thomas Garnier
2017-07-18 22:33 ` [kernel-hardening] " Thomas Garnier
2017-07-18 22:33 ` [RFC 20/22] x86/relocs: Add option to generate 64-bit relocations Thomas Garnier
2017-07-18 22:33 ` [kernel-hardening] " Thomas Garnier
2017-07-19 22:33 ` H. Peter Anvin
2017-07-19 22:33 ` H. Peter Anvin
2017-07-19 22:33 ` [kernel-hardening] " H. Peter Anvin
2017-07-19 22:47 ` Thomas Garnier
2017-07-19 22:47 ` Thomas Garnier
2017-07-19 22:47 ` [kernel-hardening] " Thomas Garnier
2017-07-19 23:08 ` H. Peter Anvin
2017-07-19 23:08 ` [kernel-hardening] " H. Peter Anvin
2017-07-19 23:25 ` Thomas Garnier
2017-07-19 23:25 ` [kernel-hardening] " Thomas Garnier
2017-07-19 23:45 ` H. Peter Anvin
2017-07-19 23:45 ` H. Peter Anvin
2017-07-19 23:45 ` H. Peter Anvin
2017-07-19 23:45 ` H. Peter Anvin
2017-07-19 23:45 ` H. Peter Anvin
2017-07-19 23:45 ` H. Peter Anvin
2017-07-19 23:45 ` H. Peter Anvin
2017-07-19 23:25 ` Thomas Garnier
2017-07-19 23:08 ` H. Peter Anvin [this message]
2017-07-18 22:33 ` [RFC 21/22] x86/module: Add support for mcmodel large and PLTs Thomas Garnier
2017-07-18 22:33 ` [kernel-hardening] " Thomas Garnier
2017-07-19 1:35 ` H. Peter Anvin
2017-07-19 1:35 ` H. Peter Anvin
2017-07-19 1:35 ` [kernel-hardening] " H. Peter Anvin
2017-07-19 3:59 ` Brian Gerst
2017-07-19 3:59 ` Brian Gerst
2017-07-19 3:59 ` [kernel-hardening] " Brian Gerst
2017-07-19 15:58 ` Thomas Garnier
2017-07-19 15:58 ` Thomas Garnier
2017-07-19 15:58 ` [kernel-hardening] " Thomas Garnier
2017-07-19 17:34 ` Brian Gerst
2017-07-19 17:34 ` [kernel-hardening] " Brian Gerst
2017-07-24 16:32 ` Thomas Garnier
2017-07-24 16:32 ` [kernel-hardening] " Thomas Garnier
2017-07-24 16:32 ` Thomas Garnier
2017-07-19 17:34 ` Brian Gerst
2017-07-18 22:33 ` [RFC 22/22] x86/kaslr: Add option to extend KASLR range from 1GB to 3GB Thomas Garnier
2017-07-18 22:33 ` [kernel-hardening] " Thomas Garnier
2017-07-19 12:10 ` Baoquan He
2017-07-19 12:10 ` [kernel-hardening] " Baoquan He
2017-07-19 13:49 ` Baoquan He
2017-07-19 13:49 ` Baoquan He
2017-07-19 13:49 ` [kernel-hardening] " Baoquan He
2017-07-19 12:10 ` Baoquan He
2017-07-19 14:08 ` x86: PIE support and option to extend KASLR randomization Christopher Lameter
2017-07-19 14:08 ` [kernel-hardening] " Christopher Lameter
2017-07-19 19:21 ` Kees Cook
2017-07-19 19:21 ` Kees Cook
2017-07-19 19:21 ` [kernel-hardening] " Kees Cook
2017-07-19 14:08 ` Christopher Lameter
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