From patchwork Sat Aug 13 01:08:54 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Gwan-gyeong Mun X-Patchwork-Id: 12942629 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id B899AC00140 for ; Sat, 13 Aug 2022 01:10:30 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 7B51512A05F; Sat, 13 Aug 2022 01:09:28 +0000 (UTC) Received: from mga11.intel.com (mga11.intel.com [192.55.52.93]) by gabe.freedesktop.org (Postfix) with ESMTPS id 29F1BA97F3; Sat, 13 Aug 2022 01:09:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1660352951; x=1691888951; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=+iAHdiE53eJhFbUBHHSk44M7dSlJIiKyoBbOUgFS8F4=; b=MIcn1EKKP43ef5//8RHg79PiAiA5G6LZQP21rX0GV6hTVOUF9URBq27U D8krwkqo81vhjM+hVHqnerqAfULr2Vmd14xOABdE2qZD5dCKJCQR/9cv+ koUZLqi6p0Bw3kQ+1xKW8sif+IsfHXJ2l4udt8bTd7i2zwFcrZu1Ylg9u /YZDvnGmpimqyA67FBo6ykPhIRRswlV2Q+MPq+lA8T0X8gfvHNA+JbKSZ jsIJEQuwfwggO533hR/qfSbRrFslgtt3vKPhvbURja62meaZ3b6xxEwqv 2ZWojCWA5I9IbbpHjLEI5zUdje9L+oG5tUyUggP7Rex0Y8HIX7ynrhE8O Q==; X-IronPort-AV: E=McAfee;i="6400,9594,10437"; a="289285896" X-IronPort-AV: E=Sophos;i="5.93,233,1654585200"; d="scan'208";a="289285896" Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Aug 2022 18:09:11 -0700 X-IronPort-AV: E=Sophos;i="5.93,233,1654585200"; d="scan'208";a="666038376" Received: from akoska-mobl1.ger.corp.intel.com (HELO hades.ger.corp.intel.com) ([10.252.36.156]) by fmsmga008-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Aug 2022 18:09:08 -0700 From: Gwan-gyeong Mun To: intel-gfx@lists.freedesktop.org Date: Sat, 13 Aug 2022 04:08:54 +0300 Message-Id: <20220813010857.4043956-6-gwan-gyeong.mun@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220813010857.4043956-1-gwan-gyeong.mun@intel.com> References: <20220813010857.4043956-1-gwan-gyeong.mun@intel.com> MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH v6 5/8] drm/i915: Check for integer truncation on the configuration of ttm place X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: thomas.hellstrom@linux.intel.com, jani.nikula@intel.com, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, chris@chris-wilson.co.uk, airlied@linux.ie, andrzej.hajda@intel.com, matthew.auld@intel.com, daniel@ffwll.ch, mchehab@kernel.org, nirmoy.das@intel.com Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" There is an impedance mismatch between the first/last valid page frame number of ttm place in unsigned and our memory/page accounting in unsigned long. 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 to unsigned, we use overflows_type check and report E2BIG or overflow_type prior to the operation. v3: Not to change execution inside a macro. (Mauro) Add safe_conversion_gem_bug_on() macro and remove temporal SAFE_CONVERSION() macro. v4: Fix unhandled GEM_BUG_ON() macro call from safe_conversion_gem_bug_on() v6: Fix to follow general use case for GEM_BUG_ON(). (Jani) Signed-off-by: Gwan-gyeong Mun Cc: Chris Wilson Cc: Matthew Auld Cc: Thomas Hellström Cc: Jani Nikula Reviewed-by: Nirmoy Das (v2) Reviewed-by: Mauro Carvalho Chehab (v3) Reported-by: kernel test robot Reviewed-by: Andrzej Hajda (v5) --- drivers/gpu/drm/i915/gem/i915_gem_ttm.c | 6 +++--- drivers/gpu/drm/i915/intel_region_ttm.c | 22 +++++++++++++++++++--- 2 files changed, 22 insertions(+), 6 deletions(-) diff --git a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c index 9f2be1892b6c..30f488712abe 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c @@ -140,14 +140,14 @@ i915_ttm_place_from_region(const struct intel_memory_region *mr, if (flags & I915_BO_ALLOC_CONTIGUOUS) place->flags |= TTM_PL_FLAG_CONTIGUOUS; if (offset != I915_BO_INVALID_OFFSET) { - place->fpfn = offset >> PAGE_SHIFT; - place->lpfn = place->fpfn + (size >> PAGE_SHIFT); + GEM_BUG_ON(!safe_conversion(&place->fpfn, offset >> PAGE_SHIFT)); + GEM_BUG_ON(!safe_conversion(&place->lpfn, place->fpfn + (size >> PAGE_SHIFT))); } else if (mr->io_size && mr->io_size < mr->total) { if (flags & I915_BO_ALLOC_GPU_ONLY) { place->flags |= TTM_PL_FLAG_TOPDOWN; } else { place->fpfn = 0; - place->lpfn = mr->io_size >> PAGE_SHIFT; + GEM_BUG_ON(!safe_conversion(&place->lpfn, mr->io_size >> PAGE_SHIFT)); } } } diff --git a/drivers/gpu/drm/i915/intel_region_ttm.c b/drivers/gpu/drm/i915/intel_region_ttm.c index 575d67bc6ffe..c480b0b50bcc 100644 --- a/drivers/gpu/drm/i915/intel_region_ttm.c +++ b/drivers/gpu/drm/i915/intel_region_ttm.c @@ -209,14 +209,28 @@ intel_region_ttm_resource_alloc(struct intel_memory_region *mem, if (flags & I915_BO_ALLOC_CONTIGUOUS) place.flags |= TTM_PL_FLAG_CONTIGUOUS; if (offset != I915_BO_INVALID_OFFSET) { - place.fpfn = offset >> PAGE_SHIFT; - place.lpfn = place.fpfn + (size >> PAGE_SHIFT); + if (!safe_conversion(&place.fpfn, offset >> PAGE_SHIFT)) { + GEM_BUG_ON(!safe_conversion(&place.fpfn,offset >> PAGE_SHIFT)); + ret = -E2BIG; + goto out; + } + if (!safe_conversion(&place.lpfn, place.fpfn + (size >> PAGE_SHIFT))) { + GEM_BUG_ON(!safe_conversion(&place.lpfn, + place.fpfn + (size >> PAGE_SHIFT))); + ret = -E2BIG; + goto out; + } } else if (mem->io_size && mem->io_size < mem->total) { if (flags & I915_BO_ALLOC_GPU_ONLY) { place.flags |= TTM_PL_FLAG_TOPDOWN; } else { place.fpfn = 0; - place.lpfn = mem->io_size >> PAGE_SHIFT; + if (!safe_conversion(&place.lpfn, mem->io_size >> PAGE_SHIFT)) { + GEM_BUG_ON(!safe_conversion(&place.lpfn, + mem->io_size >> PAGE_SHIFT)); + ret = -E2BIG; + goto out; + } } } @@ -224,6 +238,8 @@ intel_region_ttm_resource_alloc(struct intel_memory_region *mem, mock_bo.bdev = &mem->i915->bdev; ret = man->func->alloc(man, &mock_bo, &place, &res); + +out: if (ret == -ENOSPC) ret = -ENXIO; if (!ret)