From: Jani Nikula <jani.nikula@intel.com>
To: Gwan-gyeong Mun <gwan-gyeong.mun@intel.com>,
intel-gfx@lists.freedesktop.org
Cc: linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
mchehab@kernel.org, chris@chris-wilson.co.uk,
matthew.auld@intel.com, thomas.hellstrom@linux.intel.com,
nirmoy.das@intel.com, airlied@redhat.com, daniel@ffwll.ch,
andi.shyti@linux.intel.com, andrzej.hajda@intel.com,
keescook@chromium.org, mauro.chehab@linux.intel.com,
linux@rasmusvillemoes.dk, vitor@massaru.org, dlatypov@google.com,
ndesaulniers@google.com, trix@redhat.com, llvm@lists.linux.dev,
linux-hardening@vger.kernel.org, linux-sparse@vger.kernel.org,
nathan@kernel.org, gustavoars@kernel.org,
luc.vanoostenryck@gmail.com
Subject: Re: [PATCH v13 5/9] drm/i915: Check for integer truncation on scatterlist creation
Date: Wed, 28 Sep 2022 11:51:00 +0300 [thread overview]
Message-ID: <87edvvzxu3.fsf@intel.com> (raw)
In-Reply-To: <20220928081300.101516-6-gwan-gyeong.mun@intel.com>
On Wed, 28 Sep 2022, Gwan-gyeong Mun <gwan-gyeong.mun@intel.com> wrote:
> diff --git a/drivers/gpu/drm/i915/i915_scatterlist.h b/drivers/gpu/drm/i915/i915_scatterlist.h
> index 9ddb3e743a3e..1d1802beb42b 100644
> --- a/drivers/gpu/drm/i915/i915_scatterlist.h
> +++ b/drivers/gpu/drm/i915/i915_scatterlist.h
> @@ -220,4 +220,15 @@ struct i915_refct_sgt *i915_rsgt_from_buddy_resource(struct ttm_resource *res,
> u64 region_start,
> u32 page_alignment);
>
> +/* Wrap scatterlist.h to sanity check for integer truncation */
> +typedef unsigned int __sg_size_t; /* see linux/scatterlist.h */
> +#define sg_alloc_table(sgt, nents, gfp) \
> + overflows_type(nents, __sg_size_t) ? -E2BIG \
> + : ((sg_alloc_table)(sgt, (__sg_size_t)(nents), gfp))
> +
> +#define sg_alloc_table_from_pages_segment(sgt, pages, npages, offset, size, max_segment, gfp) \
> + overflows_type(npages, __sg_size_t) ? -E2BIG \
> + : ((sg_alloc_table_from_pages_segment)(sgt, pages, (__sg_size_t)(npages), offset, \
> + size, max_segment, gfp))
> +
> #endif
No. I don't think we should shadow sg_alloc_table() and
sg_alloc_table_from_pages_segment().
Either get this in scatterlist.h (preferred) or prefix with i915_ or
whatever to indicate it's our local thing.
i915_scatterlist.h already has too much scatterlist "namespace" abuse
that I'd rather see gone than violated more.
BR,
Jani.
--
Jani Nikula, Intel Open Source Graphics Center
next prev parent reply other threads:[~2022-09-28 8:51 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-28 8:12 [PATCH v13 0/9] Fixes integer overflow or integer truncation issues in page lookups, ttm place configuration and scatterlist creation Gwan-gyeong Mun
2022-09-28 8:12 ` [PATCH v13 1/9] overflow: Allow mixed type arguments Gwan-gyeong Mun
2022-09-28 8:12 ` [PATCH v13 2/9] overflow: Introduce check_assign() and check_assign_user_ptr() Gwan-gyeong Mun
2022-09-28 8:12 ` [PATCH v13 3/9] overflow: Introduce overflows_type() and castable_to_type() Gwan-gyeong Mun
2022-09-28 8:12 ` [PATCH v13 4/9] drm/i915/gem: Typecheck page lookups Gwan-gyeong Mun
2022-09-28 8:12 ` [PATCH v13 5/9] drm/i915: Check for integer truncation on scatterlist creation Gwan-gyeong Mun
2022-09-28 8:51 ` Jani Nikula [this message]
2022-10-07 16:38 ` Gwan-gyeong Mun
2022-09-28 17:09 ` Linus Torvalds
2022-09-28 18:06 ` Kees Cook
2022-10-07 16:40 ` Gwan-gyeong Mun
2022-10-07 16:45 ` Gwan-gyeong Mun
2022-09-28 8:12 ` [PATCH v13 6/9] drm/i915: Check for integer truncation on the configuration of ttm place Gwan-gyeong Mun
2022-09-28 8:12 ` [PATCH v13 7/9] drm/i915: Check if the size is too big while creating shmem file Gwan-gyeong Mun
2022-09-28 8:12 ` [PATCH v13 8/9] drm/i915: Use error code as -E2BIG when the size of gem ttm object is too large Gwan-gyeong Mun
2022-09-28 8:13 ` [PATCH v13 9/9] drm/i915: Remove truncation warning for large objects Gwan-gyeong Mun
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