[PATCH 00/11] treewide: address gcc-11 -Wstringop-overread warnings

Arnd Bergmann arnd at kernel.org
Mon Mar 22 16:02:38 UTC 2021

From: Arnd Bergmann <arnd at arndb.de>

The coming gcc release introduces a new warning for string operations
reading beyond the end of a fixed-length object. After testing
randconfig kernels for a while, think I have patches for any such
warnings that came up on x86, arm and arm64.

Most of these warnings are false-positive ones, either gcc warning
about something that is entirely correct, or about something that
looks suspicious but turns out to be correct after all.

The two patches for the i915 driver look like something that might
be actual bugs, but I am not sure about those either.

We probably want some combination of workaround like the ones I
post here and changes to gcc to have fewer false positives in the
release. I'm posting the entire set of workaround that give me
a cleanly building kernel for reference here.


Arnd Bergmann (11):
  x86: compressed: avoid gcc-11 -Wstringop-overread warning
  x86: tboot: avoid Wstringop-overread-warning
  security: commoncap: fix -Wstringop-overread warning
  ath11: Wstringop-overread warning
  qnx: avoid -Wstringop-overread warning
  cgroup: fix -Wzero-length-bounds warnings
  ARM: sharpsl_param: work around -Wstringop-overread warning
  atmel: avoid gcc -Wstringop-overflow warning
  scsi: lpfc: fix gcc -Wstringop-overread warning
  drm/i915: avoid stringop-overread warning on pri_latency
  [RFC] drm/i915/dp: fix array overflow warning

 arch/arm/common/sharpsl_param.c         |  4 ++-
 arch/x86/boot/compressed/misc.c         |  2 --
 arch/x86/kernel/tboot.c                 | 44 +++++++++++++++----------
 drivers/gpu/drm/i915/display/intel_dp.c |  2 +-
 drivers/gpu/drm/i915/i915_drv.h         |  6 ++--
 drivers/net/wireless/ath/ath11k/mac.c   |  2 +-
 drivers/net/wireless/atmel/atmel.c      | 25 ++++++++------
 drivers/scsi/lpfc/lpfc_attr.c           |  6 ++--
 fs/qnx4/dir.c                           | 11 +++----
 kernel/cgroup/cgroup.c                  | 15 +++++++--
 security/commoncap.c                    |  2 +-
 11 files changed, 69 insertions(+), 50 deletions(-)

Cc: x86 at kernel.org
Cc: Ning Sun <ning.sun at intel.com>
Cc: Jani Nikula <jani.nikula at linux.intel.com>
Cc: Kalle Valo <kvalo at codeaurora.org>
Cc: Simon Kelley <simon at thekelleys.org.uk>
Cc: James Smart <james.smart at broadcom.com>
Cc: "James E.J. Bottomley" <jejb at linux.ibm.com>
Cc: Anders Larsen <al at alarsen.net>
Cc: Tejun Heo <tj at kernel.org>
Cc: Serge Hallyn <serge at hallyn.com>
Cc: Imre Deak <imre.deak at intel.com>
Cc: linux-arm-kernel at lists.infradead.org
Cc: linux-kernel at vger.kernel.org
Cc: tboot-devel at lists.sourceforge.net
Cc: intel-gfx at lists.freedesktop.org
Cc: dri-devel at lists.freedesktop.org
Cc: ath11k at lists.infradead.org
Cc: linux-wireless at vger.kernel.org
Cc: netdev at vger.kernel.org
Cc: linux-scsi at vger.kernel.org
Cc: cgroups at vger.kernel.org
Cc: linux-security-module at vger.kernel.org


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