From: Thomas Garnier <thgarnie@google.com> To: Ingo Molnar <mingo@kernel.org> Cc: "Herbert Xu" <herbert@gondor.apana.org.au>, "David S . Miller" <davem@davemloft.net>, "Thomas Gleixner" <tglx@linutronix.de>, "Ingo Molnar" <mingo@redhat.com>, "H . Peter Anvin" <hpa@zytor.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>, "Tom Lendacky" <thomas.lendacky@amd.com>, "Andy Lutomirski" <luto@kernel.org>, "Borislav Petkov" <bp@suse.de>, "Brian Gerst" <brgerst@gmail.com>, "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>, "Rafael J . Wysocki" <rjw@rjwysocki.net>, "Len Brown" <len.brown@intel.com>, "Pavel Machek" <pavel@ucw.cz>, "Tejun Heo" <tj@kernel.org> Subject: Re: x86: PIE support and option to extend KASLR randomization Date: Fri, 11 Aug 2017 08:09:04 -0700 [thread overview] Message-ID: <CAJcbSZFTX3uiS2g8JriS6+z_+WrG8z3hrQo4OSuyHpiyUDJWYA@mail.gmail.com> (raw) In-Reply-To: <20170811124127.kkb5pnkljz4umxuj@gmail.com> On Fri, Aug 11, 2017 at 5:41 AM, Ingo Molnar <mingo@kernel.org> wrote: > > * Thomas Garnier <thgarnie@google.com> wrote: > >> Changes: >> - v2: >> - Add support for global stack cookie while compiler default to fs without >> mcmodel=kernel >> - Change patch 7 to correctly jump out of the identity mapping on kexec load >> preserve. >> >> These patches make the changes necessary to build the kernel as Position >> Independent Executable (PIE) on x86_64. A PIE kernel can be relocated below >> the top 2G of the virtual address space. It allows to optionally extend the >> KASLR randomization range from 1G to 3G. > > So this: > > 61 files changed, 923 insertions(+), 299 deletions(-) > > ... is IMHO an _awful_ lot of churn and extra complexity in pretty fragile pieces > of code, to gain what appears to be only ~1.5 more bits of randomization! The range increase is a way to use PIE right away. > > Do these changes get us closer to being able to build the kernel as truly position > independent, i.e. to place it anywhere in the valid x86-64 address space? Or any > other advantages? Yes, PIE allows us to put the kernel anywhere in memory. It will allow us to have a full randomized address space where position and order of sections are completely random. There is still some work to get there but being able to build a PIE kernel is a significant step. > > Thanks, > > Ingo -- Thomas
WARNING: multiple messages have this Message-ID (diff)
From: Thomas Garnier <thgarnie@google.com> To: Ingo Molnar <mingo@kernel.org> Cc: "Herbert Xu" <herbert@gondor.apana.org.au>, "David S . Miller" <davem@davemloft.net>, "Thomas Gleixner" <tglx@linutronix.de>, "Ingo Molnar" <mingo@redhat.com>, "H . Peter Anvin" <hpa@zytor.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>, "Tom Lendacky" <thomas.lendacky@amd.com>, "Andy Lutomirski" <luto@kernel.org>, "Borislav Petkov" <bp@suse.de>, "Brian Gerst" <brgerst@gmail.com>, "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>, "Rafael J . Wysocki" <rjw@rjwysocki.net>, "Len Brown" <len.brown@intel.com>, "Pavel Machek" <pavel@ucw.cz>, "Tejun Heo" <tj@kernel.org>, "Christoph Lameter" <cl@linux.com>, "Paul Gortmaker" <paul.gortmaker@windriver.com>, "Chris Metcalf" <cmetcalf@mellanox.com>, "Andrew Morton" <akpm@linux-foundation.org>, "Paul E . McKenney" <paulmck@linux.vnet.ibm.com>, "Nicolas Pitre" <nicolas.pitre@linaro.org>, "Christopher Li" <sparse@chrisli.org>, "Rafael J . Wysocki" <rafael.j.wysocki@intel.com>, "Lukas Wunner" <lukas@wunner.de>, "Mika Westerberg" <mika.westerberg@linux.intel.com>, "Dou Liyang" <douly.fnst@cn.fujitsu.com>, "Daniel Borkmann" <daniel@iogearbox.net>, "Alexei Starovoitov" <ast@kernel.org>, "Masahiro Yamada" <yamada.masahiro@socionext.com>, "Markus Trippelsdorf" <markus@trippelsdorf.de>, "Steven Rostedt" <rostedt@goodmis.org>, "Kees Cook" <keescook@chromium.org>, "Rik van Riel" <riel@redhat.com>, "David Howells" <dhowells@redhat.com>, "Waiman Long" <longman@redhat.com>, "Kyle Huey" <me@kylehuey.com>, "Peter Foley" <pefoley2@pefoley.com>, "Tim Chen" <tim.c.chen@linux.intel.com>, "Catalin Marinas" <catalin.marinas@arm.com>, "Ard Biesheuvel" <ard.biesheuvel@linaro.org>, "Michal Hocko" <mhocko@suse.com>, "Matthew Wilcox" <mawilcox@microsoft.com>, "H . J . Lu" <hjl.tools@gmail.com>, "Paul Bolle" <pebolle@tiscali.nl>, "Rob Landley" <rob@landley.net>, "Baoquan He" <bhe@redhat.com>, "Daniel Micay" <danielmicay@gmail.com>, "the arch/x86 maintainers" <x86@kernel.org>, linux-crypto@vger.kernel.org, LKML <linux-kernel@vger.kernel.org>, xen-devel@lists.xenproject.org, "kvm list" <kvm@vger.kernel.org>, "Linux PM list" <linux-pm@vger.kernel.org>, linux-arch <linux-arch@vger.kernel.org>, linux-sparse@vger.kernel.org, "Kernel Hardening" <kernel-hardening@lists.openwall.com>, "Linus Torvalds" <torvalds@linux-foundation.org>, "Peter Zijlstra" <a.p.zijlstra@chello.nl>, "Borislav Petkov" <bp@alien8.de> Subject: [kernel-hardening] Re: x86: PIE support and option to extend KASLR randomization Date: Fri, 11 Aug 2017 08:09:04 -0700 [thread overview] Message-ID: <CAJcbSZFTX3uiS2g8JriS6+z_+WrG8z3hrQo4OSuyHpiyUDJWYA@mail.gmail.com> (raw) In-Reply-To: <20170811124127.kkb5pnkljz4umxuj@gmail.com> On Fri, Aug 11, 2017 at 5:41 AM, Ingo Molnar <mingo@kernel.org> wrote: > > * Thomas Garnier <thgarnie@google.com> wrote: > >> Changes: >> - v2: >> - Add support for global stack cookie while compiler default to fs without >> mcmodel=kernel >> - Change patch 7 to correctly jump out of the identity mapping on kexec load >> preserve. >> >> These patches make the changes necessary to build the kernel as Position >> Independent Executable (PIE) on x86_64. A PIE kernel can be relocated below >> the top 2G of the virtual address space. It allows to optionally extend the >> KASLR randomization range from 1G to 3G. > > So this: > > 61 files changed, 923 insertions(+), 299 deletions(-) > > ... is IMHO an _awful_ lot of churn and extra complexity in pretty fragile pieces > of code, to gain what appears to be only ~1.5 more bits of randomization! The range increase is a way to use PIE right away. > > Do these changes get us closer to being able to build the kernel as truly position > independent, i.e. to place it anywhere in the valid x86-64 address space? Or any > other advantages? Yes, PIE allows us to put the kernel anywhere in memory. It will allow us to have a full randomized address space where position and order of sections are completely random. There is still some work to get there but being able to build a PIE kernel is a significant step. > > Thanks, > > Ingo -- Thomas
next prev parent reply other threads:[~2017-08-11 15:09 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 ` Pavel Machek 2017-08-11 12:36 ` [kernel-hardening] " Pavel Machek 2017-08-11 15:09 ` Thomas Garnier 2017-08-11 15:09 ` [kernel-hardening] " Thomas Garnier 2017-08-11 15:09 ` Thomas Garnier 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 ` [kernel-hardening] " Ingo Molnar 2017-08-11 15:09 ` Thomas Garnier [this message] 2017-08-11 15:09 ` 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 ` [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 ` Thomas Garnier 2017-08-15 14:58 ` [kernel-hardening] " Thomas Garnier 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 ` [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 ` 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 ` [kernel-hardening] " Thomas Garnier 2017-08-25 15:35 ` 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 ` Thomas Garnier 2017-08-25 15:05 ` [kernel-hardening] " Thomas Garnier 2017-08-29 19:34 ` 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 ` [kernel-hardening] " Ard Biesheuvel 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 ` Thomas Garnier 2017-09-22 14:38 ` [kernel-hardening] " Thomas Garnier 2017-09-22 23:55 ` Thomas Garnier 2017-09-22 23:55 ` Thomas Garnier 2017-09-22 23:55 ` [kernel-hardening] " Thomas Garnier 2017-09-21 21:21 ` Thomas Garnier 2017-09-21 16:10 ` Ard Biesheuvel 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 ` 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 ` Thomas Garnier 2017-10-02 20:28 ` [kernel-hardening] " Thomas Garnier 2017-09-23 9:43 ` Ingo Molnar 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 ` [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 2017-09-22 18:57 ` Kees Cook 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 ` Ingo Molnar 2017-09-23 9:49 ` [kernel-hardening] " Ingo Molnar 2017-09-22 18:38 ` H. Peter Anvin 2017-09-21 21:16 ` Thomas Garnier 2017-09-21 15:59 ` Ingo Molnar 2017-08-25 8:04 ` Ingo Molnar 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 ` Boris Lukashev 2017-08-27 22:39 ` [kernel-hardening] " Boris Lukashev 2017-08-28 9:59 ` Pavel Machek 2017-08-28 9:59 ` [kernel-hardening] " Pavel Machek 2017-08-28 9:59 ` Pavel Machek 2017-08-17 8:09 ` Ingo Molnar 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 ` [kernel-hardening] " Peter Zijlstra 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 ` [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 ` Ingo Molnar 2017-09-25 7:33 ` [kernel-hardening] " Ingo Molnar 2017-10-06 10:39 ` Pavel Machek 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 ` Ingo Molnar 2017-10-20 8:13 ` [kernel-hardening] " Ingo Molnar 2017-09-23 10:00 ` Ingo Molnar 2017-09-22 18:27 ` H. Peter Anvin 2017-08-21 14:28 ` Peter Zijlstra 2017-08-16 15:12 ` 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 ` [kernel-hardening] " Thomas Garnier 2017-08-21 15:57 ` Thomas Garnier 2017-08-28 1:26 ` H. Peter Anvin 2017-08-28 1:26 ` H. Peter Anvin 2017-08-28 1:26 ` [kernel-hardening] " H. Peter Anvin 2017-08-15 14:20 ` Thomas Garnier 2017-08-11 15:09 ` Thomas Garnier 2017-08-11 12:41 ` Ingo Molnar -- 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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