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Date:   Tue, 30 Jul 2019 11:01:50 -0700
From:   Kees Cook <keescook@chromium.org>
To:     Thomas Gleixner <tglx@linutronix.de>
Cc:     Thomas Garnier <thgarnie@chromium.org>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        kernel-hardening@lists.openwall.com, kristen@linux.intel.com,
        Herbert Xu <herbert@gondor.apana.org.au>,
        "David S. Miller" <davem@davemloft.net>,
        "H. Peter Anvin" <hpa@zytor.com>, x86@kernel.org,
        Andy Lutomirski <luto@kernel.org>,
        Juergen Gross <jgross@suse.com>,
        Alok Kataria <akataria@vmware.com>,
        "Rafael J. Wysocki" <rjw@rjwysocki.net>,
        Len Brown <len.brown@intel.com>, Pavel Machek <pavel@ucw.cz>,
        Peter Zijlstra <peterz@infradead.org>,
        Nadav Amit <namit@vmware.com>, Jann Horn <jannh@google.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Boris Ostrovsky <boris.ostrovsky@oracle.com>,
        Feng Tang <feng.tang@intel.com>,
        Maran Wilson <maran.wilson@oracle.com>,
        Enrico Weigelt <info@metux.net>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Alexios Zavras <alexios.zavras@intel.com>,
        linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org,
        virtualization@lists.linux-foundation.org, linux-pm@vger.kernel.org
Subject: Re: [PATCH v8 00/11] x86: PIE support to extend KASLR randomization
Message-ID: <201907301100.90BB865078@keescook>
References: <20190708174913.123308-1-thgarnie@chromium.org>
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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