linux-kernel - [PATCH 0/4] bitmap: fix conversion from/to fix-sized arrays

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Date:   Wed, 20 Apr 2022 15:25:26 -0700
From:   Yury Norov <yury.norov@...il.com>
To:     linux-kernel@...r.kernel.org,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Claudio Imbrenda <imbrenda@...ux.ibm.com>,
        David Hildenbrand <david@...hat.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Janosch Frank <frankja@...ux.ibm.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Sven Schnelle <svens@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Yury Norov <yury.norov@...il.com>, linux-s390@...r.kernel.org,
        kvm@...r.kernel.org
Subject: [PATCH 0/4] bitmap: fix conversion from/to fix-sized arrays

In the kernel codebase we have functions that call bitmap_copy()
to convert bitmaps to and from fix-sized 32 or 64-bit arrays. It
works well for LE architectures when size of long is equal to the
size of fixed type.

If the system is BE and/or size of long is not equal to the size of
fixed type of the array, bitmap_copy() may produce wrong result either
because of endianness issue, or because of out-of-bound access.

To address this problem we already have bitmap_{from,to}_arr32().
In recent discussion it was spotted that we also need 64-bit
analogue of it:
https://lore.kernel.org/all/YiCWNdWd+AsLbDkp@smile.fi.intel.com/T/#m754da92acb0003e12b99293d07ddcd46dbe04ada

This series takes care of it.

Yury Norov (4):
  lib/bitmap: extend comment for bitmap_(from,to)_arr32()
  lib: add bitmap_{from,to}_arr64
  KVM: s390: replace bitmap_copy with bitmap_{from,to}_arr64 where
    appropriate
  drm/amd/pm: use bitmap_{from,to}_arr32 where appropriate

 arch/s390/kvm/kvm-s390.c                      | 10 ++--
 .../gpu/drm/amd/pm/swsmu/smu11/smu_v11_0.c    |  2 +-
 .../gpu/drm/amd/pm/swsmu/smu13/smu_v13_0.c    |  2 +-
 include/linux/bitmap.h                        | 31 +++++++++---
 lib/bitmap.c                                  | 47 +++++++++++++++++++
 5 files changed, 77 insertions(+), 15 deletions(-)

-- 
2.32.0