[PATCH 0/4] Fixes integer overflow or integer truncation issues in page lookups, ttm place configuration and scatterlist creation

[Gwan-gyeong Mun]

This patch series fixes integer overflow or integer truncation issues in
page lookups, ttm place configuration and scatterlist creation, etc.
We need to check that we avoid integer overflows when looking up a page,
and so fix all the instances where we have mistakenly used a plain integer
instead of a more suitable long.
And there is an impedance mismatch between the scatterlist API using
unsigned int and our memory/page accounting in unsigned long. That is we
may try to create a scatterlist for a large object that overflows returning
a small table into which we try to fit very many pages. As the object size
is under the control of userspace, we have to be prudent and catch the
conversion errors. To catch the implicit truncation as we switch from
unsigned long into the scatterlist's unsigned int, we use our overflows_type
check and report E2BIG prior to the operation. This is already used in
our create ioctls to indicate if the uABI request is simply too large for
the backing store. 
And ttm place also has the same problem with scatterlist creation,
and we fix the integer truncation problem with the way approached by
scatterlist creation.

It fixes https://gitlab.freedesktop.org/drm/intel/-/issues/4991
and https://gitlab.freedesktop.org/drm/intel/-/issues/5411

Cc: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Matthew Auld <matthew.auld at intel.com>
Cc: Thomas Hellström <thomas.hellstrom at linux.intel.com>

Chris Wilson (3):
  drm/i915/gem: Typecheck page lookups
  drm/i915: Check for integer truncation on scatterlist creation
  drm/i915: Remove truncation warning for large objects

Gwan-gyeong Mun (1):
  drm/i915: Check for integer truncation on the configuration of ttm
    place

 drivers/gpu/drm/i915/gem/i915_gem_internal.c  |  6 +-
 drivers/gpu/drm/i915/gem/i915_gem_object.c    |  7 +-
 drivers/gpu/drm/i915/gem/i915_gem_object.h    | 77 +++++++++++--------
 drivers/gpu/drm/i915/gem/i915_gem_pages.c     | 25 +++---
 drivers/gpu/drm/i915/gem/i915_gem_phys.c      |  4 +
 drivers/gpu/drm/i915/gem/i915_gem_shmem.c     |  5 +-
 drivers/gpu/drm/i915/gem/i915_gem_ttm.c       | 18 ++++-
 drivers/gpu/drm/i915/gem/i915_gem_userptr.c   |  5 +-
 .../drm/i915/gem/selftests/i915_gem_context.c | 12 +--
 .../drm/i915/gem/selftests/i915_gem_mman.c    |  8 +-
 .../drm/i915/gem/selftests/i915_gem_object.c  |  8 +-
 drivers/gpu/drm/i915/gvt/dmabuf.c             |  9 ++-
 drivers/gpu/drm/i915/i915_gem.c               | 18 ++++-
 drivers/gpu/drm/i915/i915_scatterlist.h       |  8 ++
 drivers/gpu/drm/i915/i915_utils.h             | 18 +++++
 drivers/gpu/drm/i915/i915_vma.c               |  8 +-
 drivers/gpu/drm/i915/intel_region_ttm.c       | 18 ++++-
 17 files changed, 170 insertions(+), 84 deletions(-)

-- 
2.34.1