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Date: Tue, 30 Jul 2019 11:01:50 -0700
From: Kees Cook <keescook@...omium.org>
To: Thomas Gleixner <tglx@...utronix.de>
Cc: Thomas Garnier <thgarnie@...omium.org>,
Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
kernel-hardening@...ts.openwall.com, kristen@...ux.intel.com,
Herbert Xu <herbert@...dor.apana.org.au>,
"David S. Miller" <davem@...emloft.net>,
"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
Andy Lutomirski <luto@...nel.org>,
Juergen Gross <jgross@...e.com>,
Alok Kataria <akataria@...are.com>,
"Rafael J. Wysocki" <rjw@...ysocki.net>,
Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
Peter Zijlstra <peterz@...radead.org>,
Nadav Amit <namit@...are.com>, Jann Horn <jannh@...gle.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Boris Ostrovsky <boris.ostrovsky@...cle.com>,
Feng Tang <feng.tang@...el.com>,
Maran Wilson <maran.wilson@...cle.com>,
Enrico Weigelt <info@...ux.net>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Alexios Zavras <alexios.zavras@...el.com>,
linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
virtualization@...ts.linux-foundation.org, linux-pm@...r.kernel.org
Subject: Re: [PATCH v8 00/11] x86: PIE support to extend KASLR randomization
On Mon, Jul 08, 2019 at 10:48:53AM -0700, Thomas Garnier wrote:
> Splitting the previous series in two. This part contains assembly code
> changes required for PIE but without any direct dependencies with the
> rest of the patchset.
>
> Changes:
> - patch v8 (assembly):
> - Fix issues in crypto changes (thanks to Eric Biggers).
> - Remove unnecessary jump table change.
> - Change author and signoff to chromium email address.
With -rc2 done, is this a good time for this to land in -tip? Are there
more steps needed for review?
Thanks!
-Kees
> - patch v7 (assembly):
> - Split patchset and reorder changes.
> - patch v6:
> - Rebase on latest changes in jump tables and crypto.
> - Fix wording on couple commits.
> - Revisit checkpatch warnings.
> - Moving to @chromium.org.
> - patch v5:
> - Adapt new crypto modules for PIE.
> - Improve per-cpu commit message.
> - Fix xen 32-bit build error with .quad.
> - Remove extra code for ftrace.
> - patch v4:
> - Simplify early boot by removing global variables.
> - Modify the mcount location script for __mcount_loc intead of the address
> read in the ftrace implementation.
> - Edit commit description to explain better where the kernel can be located.
> - Streamlined the testing done on each patch proposal. Always testing
> hibernation, suspend, ftrace and kprobe to ensure no regressions.
> - patch v3:
> - Update on message to describe longer term PIE goal.
> - Minor change on ftrace if condition.
> - Changed code using xchgq.
> - patch v2:
> - Adapt patch to work post KPTI and compiler changes
> - Redo all performance testing with latest configs and compilers
> - Simplify mov macro on PIE (MOVABS now)
> - Reduce GOT footprint
> - patch v1:
> - Simplify ftrace implementation.
> - Use gcc mstack-protector-guard-reg=%gs with PIE when possible.
> - rfc v3:
> - Use --emit-relocs instead of -pie to reduce dynamic relocation space on
> mapped memory. It also simplifies the relocation process.
> - Move the start the module section next to the kernel. Remove the need for
> -mcmodel=large on modules. Extends module space from 1 to 2G maximum.
> - Support for XEN PVH as 32-bit relocations can be ignored with
> --emit-relocs.
> - Support for GOT relocations previously done automatically with -pie.
> - Remove need for dynamic PLT in modules.
> - Support dymamic GOT for modules.
> - rfc 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 some of the changes necessary to build the kernel as
> Position Independent Executable (PIE) on x86_64. Another patchset will
> add the PIE option and larger architecture changes.
>
> The patches:
> - 1, 3-11: Change in assembly code to be PIE compliant.
> - 2: Add a new _ASM_MOVABS macro to fetch a symbol address generically.
>
> diffstat:
> crypto/aegis128-aesni-asm.S | 6 +-
> crypto/aegis128l-aesni-asm.S | 8 +--
> crypto/aegis256-aesni-asm.S | 6 +-
> crypto/aes-x86_64-asm_64.S | 45 ++++++++++------
> crypto/aesni-intel_asm.S | 8 +--
> crypto/aesni-intel_avx-x86_64.S | 3 -
> crypto/camellia-aesni-avx-asm_64.S | 42 +++++++--------
> crypto/camellia-aesni-avx2-asm_64.S | 44 ++++++++--------
> crypto/camellia-x86_64-asm_64.S | 8 +--
> crypto/cast5-avx-x86_64-asm_64.S | 50 ++++++++++--------
> crypto/cast6-avx-x86_64-asm_64.S | 44 +++++++++-------
> crypto/des3_ede-asm_64.S | 96 ++++++++++++++++++++++++------------
> crypto/ghash-clmulni-intel_asm.S | 4 -
> crypto/glue_helper-asm-avx.S | 4 -
> crypto/glue_helper-asm-avx2.S | 6 +-
> crypto/morus1280-avx2-asm.S | 4 -
> crypto/morus1280-sse2-asm.S | 8 +--
> crypto/morus640-sse2-asm.S | 6 +-
> crypto/sha256-avx2-asm.S | 18 ++++--
> entry/entry_64.S | 16 ++++--
> include/asm/alternative.h | 6 +-
> include/asm/asm.h | 1
> include/asm/paravirt_types.h | 25 +++++++--
> include/asm/pm-trace.h | 2
> include/asm/processor.h | 6 +-
> kernel/acpi/wakeup_64.S | 31 ++++++-----
> kernel/head_64.S | 16 +++---
> kernel/relocate_kernel_64.S | 2
> power/hibernate_asm_64.S | 4 -
> 29 files changed, 306 insertions(+), 213 deletions(-)
>
> Patchset is based on next-20190708.
>
>
--
Kees Cook
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