From: "H. Peter Anvin" <hpa@zytor.com>
To: Kees Cook <keescook@chromium.org>
Cc: "Nicolas Pitre" <nicolas.pitre@linaro.org>,
"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>,
"Alexei Starovoitov" <ast@kernel.org>,
"David Howells" <dhowells@redhat.com>,
"Paul Gortmaker" <paul.gortmaker@windriver.com>,
"Pavel Machek" <pavel@ucw.cz>,
"Kernel Hardening" <kernel-hardening@lists.openwall.com>,
"Christoph Lameter" <cl@linux.com>,
"Ingo Molnar" <mingo@kernel.org>,
"Peter Zijlstra" <a.p.zijlstra@chello.nl>,
"the arch/x86 maintainers" <x86@kernel.org>,
"Herbert Xu" <herbert@gondor.apana.org.au>,
"Daniel Borkmann" <daniel@iogearbox.net>,
"Matthew Wilcox" <mawilcox@microsoft.com>,
"Peter Foley" <pefoley2@pefoley.com>,
"Joerg Roedel" <joro@8bytes.org>,
"Rafael J . Wysocki" <rafael.j.wysocki@intel.com>
Subject: Re: x86: PIE support and option to extend KASLR randomization
Date: Fri, 22 Sep 2017 12:06:16 -0700 [thread overview]
Message-ID: <0c04349a-b9f1-5aae-517b-bd057705ae2e__20932.6863674962$1506108663$gmane$org@zytor.com> (raw)
In-Reply-To: <CAGXu5jKGTYVAKW7yA+ghsb=FYjjfh8MfOiRSEDSw883VN4KUMg@mail.gmail.com>
On 09/22/17 11:57, Kees Cook wrote:
> On Fri, Sep 22, 2017 at 11:38 AM, H. Peter Anvin <hpa@zytor.com> wrote:
>> We lose EBX on 32 bits, but we don't lose RBX on 64 bits - since x86-64
>> has RIP-relative addressing there is no need for a dedicated PIC register.
>
> FWIW, since gcc 5, the PIC register isn't totally lost. It is now
> reusable, and that seems to have improved performance:
> https://gcc.gnu.org/gcc-5/changes.html
It still talks about a PIC register on x86-64, which confuses me.
Perhaps older gcc's would allocate a PIC register under certain
circumstances, and then lose it for the entire function?
For i386, the PIC register is required by the ABI to be %ebx at the
point any PLT entry is called. Not an issue with -mno-plt which goes
straight to the GOT, although in most cases there needs to be a PIC
register to find the GOT unless load-time relocation is permitted.
-hpa
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next prev parent reply other threads:[~2017-09-22 19:30 UTC|newest]
Thread overview: 221+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-10 17:25 x86: PIE support and option to extend KASLR randomization Thomas Garnier
2017-08-10 17:25 ` [kernel-hardening] " Thomas Garnier
2017-08-10 17:25 ` [RFC v2 01/23] x86/crypto: Adapt assembly for PIE support Thomas Garnier
2017-08-10 17:25 ` [kernel-hardening] " Thomas Garnier
2017-08-10 17:25 ` [RFC v2 02/23] x86: Use symbol name on bug table " Thomas Garnier
2017-08-10 17:25 ` [kernel-hardening] " Thomas Garnier
2017-08-10 17:25 ` [RFC v2 03/23] x86: Use symbol name in jump " Thomas Garnier
2017-08-10 17:25 ` [kernel-hardening] " Thomas Garnier
2017-08-10 17:25 ` [RFC v2 04/23] x86: Add macro to get symbol address " Thomas Garnier
2017-08-10 17:25 ` [kernel-hardening] " Thomas Garnier
2017-08-10 17:25 ` [RFC v2 05/23] xen: Adapt assembly " Thomas Garnier
2017-08-10 17:25 ` [kernel-hardening] " Thomas Garnier
2017-08-10 17:25 ` [RFC v2 06/23] kvm: " Thomas Garnier
2017-08-10 17:25 ` [kernel-hardening] " Thomas Garnier
2017-08-10 17:25 ` [RFC v2 07/23] x86: relocate_kernel - " Thomas Garnier
2017-08-10 17:25 ` [kernel-hardening] " Thomas Garnier
2017-08-10 17:26 ` [RFC v2 08/23] x86/entry/64: " Thomas Garnier
2017-08-10 17:26 ` [kernel-hardening] " Thomas Garnier
2017-08-10 17:26 ` [RFC v2 09/23] x86: pm-trace - " Thomas Garnier
2017-08-10 17:26 ` [kernel-hardening] " Thomas Garnier
2017-08-10 17:26 ` [RFC v2 10/23] x86/CPU: " Thomas Garnier
2017-08-10 17:26 ` [kernel-hardening] " Thomas Garnier
2017-08-10 17:26 ` [RFC v2 11/23] x86/acpi: " Thomas Garnier
2017-08-10 17:26 ` [kernel-hardening] " Thomas Garnier
2017-08-10 17:26 ` [RFC v2 12/23] x86/boot/64: " Thomas Garnier
2017-08-10 17:26 ` [kernel-hardening] " Thomas Garnier
2017-08-10 17:26 ` [RFC v2 13/23] x86/power/64: " Thomas Garnier
2017-08-10 17:26 ` [kernel-hardening] " Thomas Garnier
2017-08-11 12:36 ` Pavel Machek
2017-08-11 12:36 ` [kernel-hardening] " Pavel Machek
2017-08-11 15:09 ` Thomas Garnier
2017-08-11 15:09 ` Thomas Garnier
2017-08-11 15:09 ` [kernel-hardening] " Thomas Garnier
2017-08-11 12:36 ` Pavel Machek
2017-08-10 17:26 ` [RFC v2 14/23] x86/paravirt: " Thomas Garnier
2017-08-10 17:26 ` [kernel-hardening] " Thomas Garnier
2017-08-10 17:26 ` [RFC v2 15/23] x86/boot/64: Use _text in a global " Thomas Garnier
2017-08-10 17:26 ` [kernel-hardening] " Thomas Garnier
2017-08-10 17:26 ` [RFC v2 16/23] x86/percpu: Adapt percpu " Thomas Garnier
2017-08-10 17:26 ` [kernel-hardening] " Thomas Garnier
2017-08-10 17:26 ` [RFC v2 17/23] compiler: Option to default to hidden symbols Thomas Garnier
2017-08-10 17:26 ` [kernel-hardening] " Thomas Garnier
2017-08-10 17:26 ` [RFC v2 18/23] x86/relocs: Handle DYN relocations for PIE support Thomas Garnier
2017-08-10 17:26 ` [kernel-hardening] " Thomas Garnier
2017-08-10 17:26 ` [RFC v2 19/23] x86: Support global stack cookie Thomas Garnier
2017-08-10 17:26 ` [kernel-hardening] " Thomas Garnier
2017-08-10 17:26 ` [RFC v2 20/23] x86/pie: Add option to build the kernel as PIE for x86_64 Thomas Garnier
2017-08-10 17:26 ` [kernel-hardening] " Thomas Garnier
2017-08-10 17:26 ` [RFC v2 21/23] x86/relocs: Add option to generate 64-bit relocations Thomas Garnier
2017-08-10 17:26 ` [kernel-hardening] " Thomas Garnier
2017-08-10 17:26 ` [RFC v2 22/23] x86/module: Add support for mcmodel large and PLTs Thomas Garnier
2017-08-10 17:26 ` [kernel-hardening] " Thomas Garnier
2017-08-10 17:26 ` [RFC v2 23/23] x86/kaslr: Add option to extend KASLR range from 1GB to 3GB Thomas Garnier
2017-08-10 17:26 ` [kernel-hardening] " Thomas Garnier
2017-08-11 12:41 ` x86: PIE support and option to extend KASLR randomization Ingo Molnar
2017-08-11 12:41 ` Ingo Molnar
2017-08-11 12:41 ` [kernel-hardening] " Ingo Molnar
2017-08-11 15:09 ` Thomas Garnier
2017-08-11 15:09 ` [kernel-hardening] " Thomas Garnier
2017-08-15 7:56 ` Ingo Molnar
2017-08-15 7:56 ` Ingo Molnar
2017-08-15 7:56 ` [kernel-hardening] " Ingo Molnar
2017-08-15 12:15 ` Jordan Glover
2017-08-15 13:42 ` Rik van Riel
2017-08-15 14:20 ` Thomas Garnier
2017-08-15 14:20 ` Thomas Garnier
2017-08-15 14:20 ` [kernel-hardening] " Thomas Garnier
2017-08-15 14:47 ` Daniel Micay
2017-08-15 14:47 ` Daniel Micay
2017-08-15 14:47 ` [kernel-hardening] " Daniel Micay
2017-08-15 14:58 ` Thomas Garnier
2017-08-15 14:58 ` [kernel-hardening] " Thomas Garnier
2017-08-15 14:58 ` Thomas Garnier
2017-08-16 15:12 ` Ingo Molnar
2017-08-16 15:12 ` Ingo Molnar
2017-08-16 15:12 ` [kernel-hardening] " Ingo Molnar
2017-08-16 16:09 ` Christopher Lameter
2017-08-16 16:09 ` Christopher Lameter
2017-08-16 16:09 ` [kernel-hardening] " Christopher Lameter
2017-08-16 16:26 ` Daniel Micay
2017-08-16 16:26 ` [kernel-hardening] " Daniel Micay
2017-08-16 16:32 ` Ard Biesheuvel
2017-08-16 16:32 ` [kernel-hardening] " Ard Biesheuvel
2017-08-16 16:32 ` Ard Biesheuvel
2017-08-16 16:26 ` Daniel Micay
2017-08-16 16:57 ` Thomas Garnier
2017-08-16 16:57 ` [kernel-hardening] " Thomas Garnier
2017-08-17 8:09 ` Ingo Molnar
2017-08-17 8:09 ` Ingo Molnar
2017-08-17 8:09 ` [kernel-hardening] " Ingo Molnar
2017-08-17 14:10 ` Thomas Garnier
2017-08-17 14:10 ` Thomas Garnier
2017-08-17 14:10 ` [kernel-hardening] " Thomas Garnier
2017-08-24 21:13 ` Thomas Garnier
2017-08-24 21:13 ` [kernel-hardening] " Thomas Garnier
2017-08-24 21:42 ` Linus Torvalds
2017-08-24 21:42 ` Linus Torvalds
2017-08-24 21:42 ` [kernel-hardening] " Linus Torvalds
2017-08-25 15:35 ` Thomas Garnier
2017-08-25 15:35 ` Thomas Garnier
2017-08-25 15:35 ` [kernel-hardening] " Thomas Garnier
2017-08-25 1:07 ` Steven Rostedt
2017-08-25 1:07 ` [kernel-hardening] " Steven Rostedt
2017-08-25 8:04 ` Ingo Molnar
2017-08-25 8:04 ` [kernel-hardening] " Ingo Molnar
2017-08-25 15:05 ` Thomas Garnier
2017-08-25 15:05 ` [kernel-hardening] " Thomas Garnier
2017-08-29 19:34 ` Thomas Garnier
2017-08-29 19:34 ` [kernel-hardening] " Thomas Garnier
2017-09-21 15:59 ` Ingo Molnar
2017-09-21 15:59 ` [kernel-hardening] " Ingo Molnar
2017-09-21 16:10 ` Ard Biesheuvel
2017-09-21 16:10 ` Ard Biesheuvel
2017-09-21 16:10 ` [kernel-hardening] " Ard Biesheuvel
2017-09-21 21:21 ` Thomas Garnier
2017-09-21 21:21 ` Thomas Garnier
2017-09-21 21:21 ` [kernel-hardening] " Thomas Garnier
2017-09-22 4:24 ` Markus Trippelsdorf
2017-09-22 4:24 ` [kernel-hardening] " Markus Trippelsdorf
2017-09-22 14:38 ` Thomas Garnier
2017-09-22 14:38 ` [kernel-hardening] " Thomas Garnier
2017-09-22 14:38 ` Thomas Garnier
2017-09-22 23:55 ` Thomas Garnier
2017-09-22 23:55 ` [kernel-hardening] " Thomas Garnier
2017-09-22 23:55 ` Thomas Garnier
2017-09-21 21:16 ` Thomas Garnier
2017-09-21 21:16 ` [kernel-hardening] " Thomas Garnier
2017-09-22 0:06 ` Thomas Garnier
2017-09-22 0:06 ` [kernel-hardening] " Thomas Garnier
2017-09-22 0:06 ` Thomas Garnier
2017-09-22 16:32 ` Ingo Molnar
2017-09-22 16:32 ` [kernel-hardening] " Ingo Molnar
2017-09-22 18:08 ` Thomas Garnier
2017-09-22 18:08 ` Thomas Garnier
2017-09-22 18:08 ` [kernel-hardening] " Thomas Garnier
2017-09-23 9:43 ` Ingo Molnar
2017-09-23 9:43 ` [kernel-hardening] " Ingo Molnar
2017-10-02 20:28 ` Thomas Garnier
2017-10-02 20:28 ` [kernel-hardening] " Thomas Garnier
2017-10-02 20:28 ` Thomas Garnier
2017-09-23 9:43 ` Ingo Molnar
2017-09-22 18:38 ` H. Peter Anvin
2017-09-22 18:38 ` H. Peter Anvin
2017-09-22 18:38 ` [kernel-hardening] " H. Peter Anvin
2017-09-22 18:57 ` Kees Cook
2017-09-22 18:57 ` Kees Cook
2017-09-22 18:57 ` [kernel-hardening] " Kees Cook
2017-09-22 19:06 ` H. Peter Anvin
2017-09-22 19:06 ` [kernel-hardening] " H. Peter Anvin
2017-09-22 22:19 ` hjl.tools
2017-09-22 22:30 ` hjl.tools
2017-09-22 19:06 ` H. Peter Anvin [this message]
2017-09-22 18:59 ` Thomas Garnier
2017-09-22 18:59 ` [kernel-hardening] " Thomas Garnier
2017-09-22 18:59 ` Thomas Garnier
2017-09-23 9:49 ` Ingo Molnar
2017-09-23 9:49 ` [kernel-hardening] " Ingo Molnar
2017-09-23 9:49 ` Ingo Molnar
2017-09-22 16:32 ` Ingo Molnar
2017-09-21 21:16 ` Thomas Garnier
2017-09-21 15:59 ` Ingo Molnar
2017-08-29 19:34 ` Thomas Garnier
2017-08-25 15:05 ` Thomas Garnier
2017-08-25 8:04 ` Ingo Molnar
2017-08-24 21:13 ` Thomas Garnier
2017-08-17 14:12 ` [kernel-hardening] " Boris Lukashev
2017-08-17 14:12 ` Boris Lukashev
2017-08-17 14:12 ` [kernel-hardening] " Boris Lukashev
2017-08-25 15:38 ` Christopher Lameter
2017-08-25 15:38 ` Christopher Lameter
2017-08-25 15:38 ` [kernel-hardening] " Christopher Lameter
2017-08-27 22:39 ` Boris Lukashev
2017-08-27 22:39 ` [kernel-hardening] " Boris Lukashev
2017-08-27 22:39 ` Boris Lukashev
2017-08-28 9:59 ` Pavel Machek
2017-08-28 9:59 ` Pavel Machek
2017-08-28 9:59 ` [kernel-hardening] " Pavel Machek
2017-08-16 16:57 ` Thomas Garnier
2017-08-21 13:32 ` Peter Zijlstra
2017-08-21 13:32 ` Peter Zijlstra
2017-08-21 13:32 ` [kernel-hardening] " Peter Zijlstra
2017-08-21 14:28 ` Peter Zijlstra
2017-08-21 14:28 ` Peter Zijlstra
2017-08-21 14:28 ` [kernel-hardening] " Peter Zijlstra
2017-09-22 18:27 ` H. Peter Anvin
2017-09-22 18:27 ` H. Peter Anvin
2017-09-22 18:27 ` [kernel-hardening] " H. Peter Anvin
2017-09-23 10:00 ` Ingo Molnar
2017-09-23 10:00 ` Ingo Molnar
2017-09-23 10:00 ` [kernel-hardening] " Ingo Molnar
2017-09-24 22:37 ` Pavel Machek
2017-09-24 22:37 ` Pavel Machek
2017-09-24 22:37 ` [kernel-hardening] " Pavel Machek
2017-09-25 7:33 ` Ingo Molnar
2017-09-25 7:33 ` [kernel-hardening] " Ingo Molnar
2017-10-06 10:39 ` Pavel Machek
2017-10-06 10:39 ` [kernel-hardening] " Pavel Machek
2017-10-20 8:13 ` Ingo Molnar
2017-10-20 8:13 ` [kernel-hardening] " Ingo Molnar
2017-10-20 8:13 ` Ingo Molnar
2017-10-06 10:39 ` Pavel Machek
2017-09-25 7:33 ` Ingo Molnar
2017-08-21 14:31 ` Peter Zijlstra
2017-08-21 14:31 ` Peter Zijlstra
2017-08-21 14:31 ` [kernel-hardening] " Peter Zijlstra
2017-08-21 15:57 ` Thomas Garnier
2017-08-21 15:57 ` Thomas Garnier
2017-08-21 15:57 ` [kernel-hardening] " Thomas Garnier
2017-08-28 1:26 ` H. Peter Anvin
2017-08-28 1:26 ` [kernel-hardening] " H. Peter Anvin
2017-08-28 1:26 ` H. Peter Anvin
2017-08-11 15:09 ` Thomas Garnier
-- strict thread matches above, loose matches on Subject: below --
2017-10-04 21:19 Thomas Garnier via Virtualization
2017-10-04 21:19 Thomas Garnier
2017-10-04 21:19 ` Thomas Garnier
2017-10-04 21:19 Thomas Garnier
2017-08-10 17:25 Thomas Garnier
2017-07-18 22:33 Thomas Garnier
2017-07-18 22:33 Thomas Garnier
2017-07-19 14:08 ` Christopher Lameter
2017-07-19 14:08 ` Christopher Lameter
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