linux-kernel - [for-stable-4.19 PATCH v2 0/2] Backport patches to fix KASAN+LKDTM with recent clang on ARM64

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Message-Id: <20210320041626.885806-1-drinkcat@chromium.org>
Date:   Sat, 20 Mar 2021 12:16:24 +0800
From:   Nicolas Boichat <drinkcat@...omium.org>
To:     stable@...r.kernel.org
Cc:     groeck@...omium.org, Nicolas Boichat <drinkcat@...omium.org>,
        Alexandre Chartre <alexandre.chartre@...cle.com>,
        Arnd Bergmann <arnd@...db.de>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Christopher Li <sparse@...isli.org>,
        Daniel Axtens <dja@...ens.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kees Cook <keescook@...omium.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Michal Marek <michal.lkml@...kovi.net>,
        "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>,
        Nicholas Piggin <npiggin@...il.com>,
        Paul Mackerras <paulus@...ba.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        clang-built-linux@...glegroups.com, linux-arch@...r.kernel.org,
        linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-sparse@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [for-stable-4.19 PATCH v2 0/2] Backport patches to fix KASAN+LKDTM with recent clang on ARM64

Backport 2 patches that are required to make KASAN+LKDTM work
with recent clang (patch 2/2 has a complete description).
Tested on our chromeos-4.19 branch.
Also compile tested on x86-64 and arm64 with gcc this time
around.

Patch 1/2 adds a guard around noinstr that matches upstream,
to prevent a build issue, and has some minor context conflicts.
Patch 2/2 is a clean backport.

These patches have been merged to 5.4 stable already. We might
need to backport to older stable branches, but this is what I
could test for now.

Changes in v2:
 - Guard noinstr macro by __KERNEL__ && !__ASSEMBLY__ to prevent
   expansion in linker script and match upstream.

Mark Rutland (1):
  lkdtm: don't move ctors to .rodata

Thomas Gleixner (1):
  vmlinux.lds.h: Create section for protection against instrumentation

 arch/powerpc/kernel/vmlinux.lds.S |  1 +
 drivers/misc/lkdtm/Makefile       |  2 +-
 drivers/misc/lkdtm/rodata.c       |  2 +-
 include/asm-generic/sections.h    |  3 ++
 include/asm-generic/vmlinux.lds.h | 10 ++++++
 include/linux/compiler.h          | 54 +++++++++++++++++++++++++++++++
 include/linux/compiler_types.h    |  6 ++++
 scripts/mod/modpost.c             |  2 +-
 8 files changed, 77 insertions(+), 3 deletions(-)

-- 
2.31.0.rc2.261.g7f71774620-goog