From: Thomas Garnier <thgarnie@chromium.org>
To: Christopher Lameter <cl@linux.com>
Cc: Kernel Hardening <kernel-hardening@lists.openwall.com>,
Kristen Carlson Accardi <kristen@linux.intel.com>,
Andy Lutomirski <luto@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
"H. Peter Anvin" <hpa@zytor.com>,
the arch/x86 maintainers <x86@kernel.org>,
Dennis Zhou <dennis@kernel.org>, Tejun Heo <tj@kernel.org>,
Boris Ostrovsky <boris.ostrovsky@oracle.com>,
Juergen Gross <jgross@suse.com>,
Stefano Stabellini <sstabellini@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Andi Kleen <ak@linux.intel.com>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
Michal Hocko <mhocko@suse.com>,
Mike Rapoport <rppt@linux.vnet.ibm.com>,
Stephen Rothwell <sfr@canb.auug.org.au>,
Cao jin <caoj.fnst@cn.fujitsu.com>,
Brijesh Singh <brijesh.singh@amd.com>,
Masahiro Yamada <yamada.masahiro@socionext.com>,
Joerg Roedel <jroedel@suse.de>,
Peter Zijlstra <peterz@infradead.org>,
Kees Cook <keescook@chromium.org>,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
LKML <linux-kernel@vger.kernel.org>,
xen-devel <xen-devel@lists.xenproject.org>
Subject: Re: [PATCH v6 14/27] x86/percpu: Adapt percpu for PIE support
Date: Mon, 8 Apr 2019 11:08:58 -0700 [thread overview]
Message-ID: <CAJcbSZFVnJ6qYNsGipf6foa8dtsX_RDykRWK-edP85ySQacsVg@mail.gmail.com> (raw)
In-Reply-To: <01000169fe18026e-a0951268-516c-4604-a4c3-140f3cbb6f7a-000000@email.amazonses.com>
On Mon, Apr 8, 2019 at 10:56 AM Christopher Lameter <cl@linux.com> wrote:
>
> On Mon, 8 Apr 2019, Thomas Garnier wrote:
>
> > > It didn't work originally but I will revisit to see if I missed something.
> >
> > I revisited and couldn't find a way to prevent relocations to the
> > percpu section. Without PIE, you can reference absolute address which
> > was convenient for percpu.
>
> Can you switch PIE off for the percpu section? If not maybe the linker
> needs to have an additional option?
I don't think so or I didn't find any option to do that. Changing the
linker might be a bit too much if we have a software solution which
doesn't impact performance.
>
> Cannot imagine that this is not possible. You neeed to be able to
> reference registers that are in fixed memory locations.
>
>
> > Christopher: Did you have something specific in mind?
>
> I thought that we just leave it as is.
I would like to as well. I will try couple things at the assembly
level instead of the linker and come back to this thread.
next prev parent reply other threads:[~2019-04-08 18:08 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-31 19:24 [PATCH v6 00/27] x86: PIE support and option to extend KASLR randomization Thomas Garnier
2019-01-31 19:24 ` [PATCH v6 01/27] x86/crypto: Adapt assembly for PIE support Thomas Garnier
2019-02-07 11:48 ` Borislav Petkov
2019-02-07 17:01 ` Thomas Garnier
2019-01-31 19:24 ` [PATCH v6 02/27] x86: Use symbol name in jump table " Thomas Garnier
2019-02-07 12:17 ` Borislav Petkov
2019-02-07 17:04 ` Thomas Garnier
2019-02-07 17:11 ` Borislav Petkov
2019-02-07 23:55 ` Thomas Garnier
2019-01-31 19:24 ` [PATCH v6 03/27] x86: Add macro to get symbol address " Thomas Garnier
2019-01-31 19:24 ` [PATCH v6 04/27] x86: relocate_kernel - Adapt assembly " Thomas Garnier
2019-01-31 19:24 ` [PATCH v6 05/27] x86/entry/64: " Thomas Garnier
2019-01-31 19:24 ` [PATCH v6 06/27] x86: pm-trace - " Thomas Garnier
2019-01-31 19:24 ` [PATCH v6 07/27] x86/CPU: " Thomas Garnier
2019-01-31 19:24 ` [PATCH v6 08/27] x86/acpi: " Thomas Garnier
2019-01-31 19:24 ` [PATCH v6 09/27] x86/boot/64: " Thomas Garnier
2019-01-31 19:24 ` [PATCH v6 10/27] x86/power/64: " Thomas Garnier
2019-01-31 19:24 ` [PATCH v6 11/27] x86/paravirt: " Thomas Garnier
2019-01-31 19:24 ` [PATCH v6 12/27] x86/alternatives: " Thomas Garnier
2019-01-31 19:24 ` [PATCH v6 13/27] x86/boot/64: Build head64.c as mcmodel large when PIE is enabled Thomas Garnier
2019-02-01 11:15 ` Kirill A. Shutemov
2019-02-01 17:11 ` Thomas Garnier
2019-01-31 19:24 ` [PATCH v6 14/27] x86/percpu: Adapt percpu for PIE support Thomas Garnier
2019-01-31 20:57 ` Christopher Lameter
2019-01-31 22:49 ` Thomas Garnier
2019-02-01 2:31 ` Christopher Lameter
2019-02-01 17:13 ` Thomas Garnier
2019-04-08 15:58 ` Thomas Garnier
2019-04-08 17:56 ` Christopher Lameter
2019-04-08 18:08 ` Thomas Garnier [this message]
2019-01-31 19:24 ` [PATCH v6 15/27] compiler: Option to default to hidden symbols Thomas Garnier
2019-02-01 7:12 ` Dan Carpenter
2019-02-01 17:00 ` Thomas Garnier
2019-02-01 8:22 ` Adrian Hunter
2019-02-01 17:35 ` Thomas Garnier
2019-01-31 19:24 ` [PATCH v6 16/27] compiler: Option to add PROVIDE_HIDDEN replacement for weak symbols Thomas Garnier
2019-01-31 19:24 ` [PATCH v6 17/27] x86/relocs: Handle PIE relocations Thomas Garnier
2019-01-31 19:24 ` [PATCH v6 18/27] xen: Adapt assembly for PIE support Thomas Garnier
2019-01-31 19:24 ` [PATCH v6 19/27] kvm: " Thomas Garnier
2019-02-06 19:56 ` Sean Christopherson
2019-02-06 21:23 ` Thomas Garnier
2019-01-31 19:24 ` [PATCH v6 20/27] x86: Support global stack cookie Thomas Garnier
2019-02-01 19:27 ` Andy Lutomirski
2019-02-01 20:21 ` Thomas Garnier
2019-02-01 22:36 ` Andy Lutomirski
2019-02-01 23:56 ` Thomas Garnier
2019-01-31 19:24 ` [PATCH v6 21/27] x86/ftrace: Adapt function tracing for PIE support Thomas Garnier
2019-01-31 19:24 ` [PATCH v6 22/27] x86/modules: Add option to start module section after kernel Thomas Garnier
2019-01-31 19:24 ` [PATCH v6 23/27] x86/modules: Adapt module loading for PIE support Thomas Garnier
2019-01-31 19:24 ` [PATCH v6 24/27] x86/mm: Make the x86 GOT read-only Thomas Garnier
2019-01-31 19:24 ` [PATCH v6 25/27] x86/pie: Add option to build the kernel as PIE Thomas Garnier
2019-01-31 19:24 ` [PATCH v6 26/27] x86/relocs: Add option to generate 64-bit relocations Thomas Garnier
2019-01-31 19:24 ` [PATCH v6 27/27] x86/kaslr: Add option to extend KASLR range from 1GB to 3GB Thomas Garnier
2019-01-31 19:59 ` [PATCH v6 00/27] x86: PIE support and option to extend KASLR randomization Kees Cook
2019-01-31 21:40 ` Konrad Rzeszutek Wilk
2019-01-31 22:42 ` Thomas Garnier
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