linux-hardening - [PATCH v13 8/9] drm/i915: Use error code as -E2BIG when the size of gem ttm object is too large

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Message-Id: <20220928081300.101516-9-gwan-gyeong.mun@intel.com>
Date:   Wed, 28 Sep 2022 11:12:59 +0300
From:   Gwan-gyeong Mun <gwan-gyeong.mun@...el.com>
To:     intel-gfx@...ts.freedesktop.org
Cc:     linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        mchehab@...nel.org, chris@...is-wilson.co.uk,
        matthew.auld@...el.com, thomas.hellstrom@...ux.intel.com,
        jani.nikula@...el.com, nirmoy.das@...el.com, airlied@...hat.com,
        daniel@...ll.ch, andi.shyti@...ux.intel.com,
        andrzej.hajda@...el.com, keescook@...omium.org,
        mauro.chehab@...ux.intel.com, linux@...musvillemoes.dk,
        vitor@...saru.org, dlatypov@...gle.com, ndesaulniers@...gle.com,
        trix@...hat.com, llvm@...ts.linux.dev,
        linux-hardening@...r.kernel.org, linux-sparse@...r.kernel.org,
        nathan@...nel.org, gustavoars@...nel.org,
        luc.vanoostenryck@...il.com
Subject: [PATCH v13 8/9] drm/i915: Use error code as -E2BIG when the size of gem ttm object is too large

The ttm_bo_init_reserved() functions returns -ENOSPC if the size is too big
to add vma. The direct function that returns -ENOSPC is drm_mm_insert_node_in_range().
To handle the same error as other code returning -E2BIG when the size is
too large, it converts return value to -E2BIG.

Signed-off-by: Gwan-gyeong Mun <gwan-gyeong.mun@...el.com>
Cc: Chris Wilson <chris@...is-wilson.co.uk>
Cc: Matthew Auld <matthew.auld@...el.com>
Cc: Thomas Hellström <thomas.hellstrom@...ux.intel.com>
Reviewed-by: Nirmoy Das <nirmoy.das@...el.com>
Reviewed-by: Mauro Carvalho Chehab <mchehab@...nel.org>
Reviewed-by: Andrzej Hajda <andrzej.hajda@...el.com>
---
 drivers/gpu/drm/i915/gem/i915_gem_ttm.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
index d33f06b95c48..a2557f1ecbce 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
@@ -1243,6 +1243,17 @@ int __i915_gem_ttm_object_init(struct intel_memory_region *mem,
 	ret = ttm_bo_init_reserved(&i915->bdev, i915_gem_to_ttm(obj), bo_type,
 				   &i915_sys_placement, page_size >> PAGE_SHIFT,
 				   &ctx, NULL, NULL, i915_ttm_bo_destroy);
+
+	/*
+	 * XXX: The ttm_bo_init_reserved() functions returns -ENOSPC if the size
+	 * is too big to add vma. The direct function that returns -ENOSPC is
+	 * drm_mm_insert_node_in_range(). To handle the same error as other code
+	 * that returns -E2BIG when the size is too large, it converts -ENOSPC to
+	 * -E2BIG.
+	 */
+	if (size >> PAGE_SHIFT > INT_MAX && ret == -ENOSPC)
+		ret = -E2BIG;
+
 	if (ret)
 		return i915_ttm_err_to_gem(ret);
 
-- 
2.37.1