From: "H. Peter Anvin" <hpa@zytor.com>
To: "Thomas Garnier" <thgarnie@google.com>,
"Herbert Xu" <herbert@gondor.apana.org.au>,
"David S . Miller" <davem@davemloft.net>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Ingo Molnar" <mingo@redhat.com>,
"Peter Zijlstra" <peterz@infradead.org>,
"Josh Poimboeuf" <jpoimboe@redhat.com>,
"Arnd Bergmann" <arnd@arndb.de>,
"Matthias Kaehlcke" <mka@chromium.org>,
"Boris Ostrovsky" <boris.ostrovsky@oracle.com>,
"Juergen Gross" <jgross@suse.com>,
"Paolo Bonzini" <pbonzini@redhat.com>,
"Radim Krčmář" <rkrcmar@redhat.com>,
"Joerg Roedel" <joro@8bytes.org>,
"Andy Lutomirski" <luto@kernel.org>,
"Borislav Petkov" <bp@alien8.de>,
"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
"Brian Gerst" <brgerst@gmail.com>, "Borislav Petkov" <bp@suse.de>,
"Christian Borntraeger" <borntraeger@de.ibm.com>
Cc: x86@kernel.org, linux-crypto@vger.kernel.org,
linux-kernel@vger.kernel.org, xen-devel@lists.xenproject.org,
kvm@vger.kernel.org, linux-pm@vger.kernel.org,
linux-arch@vger.kernel.org, linux-sparse@vger.kernel.org,
kernel-hardening@lists.openwall.com
Subject: Re: [RFC 21/22] x86/module: Add support for mcmodel large and PLTs
Date: Tue, 18 Jul 2017 18:35:05 -0700 [thread overview]
Message-ID: <c0bc2d98-d6eb-e3db-3799-2e28e9919f3d@zytor.com> (raw)
In-Reply-To: <20170718223333.110371-22-thgarnie@google.com>
On 07/18/17 15:33, Thomas Garnier wrote:
> With PIE support and KASLR extended range, the modules may be further
> away from the kernel than before breaking mcmodel=kernel expectations.
>
> Add an option to build modules with mcmodel=large. The modules generated
> code will make no assumptions on placement in memory.
>
> Despite this option, modules still expect kernel functions to be within
> 2G and generate relative calls. To solve this issue, the PLT arm64 code
> was adapted for x86_64. When a relative relocation go outside its range,
> a dynamic PLT entry is used to correctly jump to the destination.
Why large as opposed to medium or medium-PIC?
-hpa
next prev parent reply other threads:[~2017-07-19 1:35 UTC|newest]
Thread overview: 55+ 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 ` [RFC 01/22] x86/crypto: Adapt assembly for PIE support Thomas Garnier
2017-07-18 22:33 ` [RFC 02/22] x86: Use symbol name on bug table " Thomas Garnier
2017-07-18 22:33 ` [RFC 03/22] x86: Use symbol name in jump " Thomas Garnier
2017-07-18 22:33 ` [RFC 04/22] x86: Add macro to get symbol address " Thomas Garnier
2017-07-18 22:33 ` [RFC 05/22] xen: Adapt assembly " Thomas Garnier
2017-07-18 22:33 ` [RFC 06/22] kvm: " Thomas Garnier
2017-07-19 2:49 ` Brian Gerst
2017-07-19 15:40 ` Thomas Garnier
2017-07-19 22:27 ` H. Peter Anvin
2017-07-19 22:44 ` Thomas Garnier
2017-07-19 22:58 ` Ard Biesheuvel
2017-07-19 23:47 ` H. Peter Anvin
2017-07-18 22:33 ` [RFC 07/22] x86: relocate_kernel - " Thomas Garnier
2017-07-19 22:58 ` H. Peter Anvin
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 ` [RFC 09/22] x86: pm-trace - " Thomas Garnier
2017-07-18 22:33 ` [RFC 10/22] x86/CPU: " Thomas Garnier
2017-07-18 22:33 ` [RFC 11/22] x86/acpi: " Thomas Garnier
2017-07-18 22:33 ` [RFC 12/22] x86/boot/64: " Thomas Garnier
2017-07-18 22:33 ` [RFC 13/22] x86/power/64: " Thomas Garnier
2017-07-19 18:41 ` Pavel Machek
2017-07-18 22:33 ` [RFC 14/22] x86/paravirt: " 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 ` [RFC 16/22] x86/percpu: Adapt percpu " Thomas Garnier
2017-07-19 3:08 ` Brian Gerst
2017-07-19 18:26 ` Thomas Garnier
2017-07-19 23:33 ` H. Peter Anvin
2017-07-20 2:21 ` H. Peter Anvin
2017-07-20 3:03 ` H. Peter Anvin
2017-07-20 14:26 ` Thomas Garnier
2017-08-02 16:42 ` Thomas Garnier
2017-08-02 16:56 ` Kees Cook
2017-08-02 18:05 ` Thomas Garnier
2017-07-18 22:33 ` [RFC 17/22] compiler: Option to default to hidden symbols 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 ` [RFC 19/22] x86/pie: Add option to build the kernel as PIE for x86_64 Thomas Garnier
2017-07-18 22:33 ` [RFC 20/22] x86/relocs: Add option to generate 64-bit relocations Thomas Garnier
2017-07-19 22:33 ` H. Peter Anvin
2017-07-19 22:47 ` Thomas Garnier
2017-07-19 23:08 ` H. Peter Anvin
2017-07-19 23:25 ` Thomas Garnier
2017-07-19 23:45 ` H. Peter Anvin
2017-07-18 22:33 ` [RFC 21/22] x86/module: Add support for mcmodel large and PLTs Thomas Garnier
2017-07-19 1:35 ` H. Peter Anvin [this message]
2017-07-19 3:59 ` Brian Gerst
2017-07-19 15:58 ` Thomas Garnier
2017-07-19 17:34 ` Brian Gerst
2017-07-24 16:32 ` Thomas Garnier
2017-07-18 22:33 ` [RFC 22/22] x86/kaslr: Add option to extend KASLR range from 1GB to 3GB Thomas Garnier
2017-07-19 12:10 ` Baoquan He
2017-07-19 13:49 ` Baoquan He
2017-07-19 14:08 ` x86: PIE support and option to extend KASLR randomization Christopher Lameter
2017-07-19 19:21 ` Kees Cook
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