From mboxrd@z Thu Jan 1 00:00:00 1970 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1F63DC6FA92 for ; Mon, 26 Sep 2022 16:48:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230047AbiIZQs5 (ORCPT ); Mon, 26 Sep 2022 12:48:57 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57726 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229674AbiIZQry (ORCPT ); Mon, 26 Sep 2022 12:47:54 -0400 Received: from mga02.intel.com (mga02.intel.com [134.134.136.20]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7CB0180F59; Mon, 26 Sep 2022 08:41:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1664206867; x=1695742867; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=08oKMcxxiTXt48DizpMHtSAF1zSfLPxCAGRIMbMjaVY=; b=OMwtYKBE4csQSw08vIQfv/nfkmENZKLuqJ3DGfmIKHzhfPP0mw5RhDHV 8vq8kha0dNXkBJFkvxBJQf0jV1vSMNg9jNB2JfrDnKwzzudJ0z/gFHHF3 vZBOOzoqWptCL7JiMyn8kCi4Zoxs+Tz6tsorSqLObQr0Fas4rnN2U3M4k qLGfmvW3gEiFwnYtoWNGkfO80j9QWrJbTK0sCcQ2fioLkbuty8Q9Lh2iX hFsRxrupkMdAoJXDufr/6/Ndq8XGv4e6W/4BCq6Swf9LghnBnfiazqfN+ j0pqN+PknQM6FfBU3EcbF1sxzsBfJRlFlrsLJY70GGwLRBGd/3Idn1Z7R w==; X-IronPort-AV: E=McAfee;i="6500,9779,10482"; a="288199474" X-IronPort-AV: E=Sophos;i="5.93,346,1654585200"; d="scan'208";a="288199474" Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by orsmga101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Sep 2022 08:41:06 -0700 X-IronPort-AV: E=McAfee;i="6500,9779,10482"; a="763481011" X-IronPort-AV: E=Sophos;i="5.93,346,1654585200"; d="scan'208";a="763481011" Received: from bsochack-mobl2.ger.corp.intel.com (HELO paris.ger.corp.intel.com) ([10.249.128.215]) by fmsmga001-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Sep 2022 08:40:58 -0700 From: Gwan-gyeong Mun To: 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, jani.nikula@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: [PATCH v12 6/9] drm/i915: Check for integer truncation on the configuration of ttm place Date: Mon, 26 Sep 2022 18:39:50 +0300 Message-Id: <20220926153953.3836470-7-gwan-gyeong.mun@intel.com> X-Mailer: git-send-email 2.37.1 In-Reply-To: <20220926153953.3836470-1-gwan-gyeong.mun@intel.com> References: <20220926153953.3836470-1-gwan-gyeong.mun@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-sparse@vger.kernel.org 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) v7: Fix to use WARN_ON() macro where GEM_BUG_ON() macro was used. (Jani) v8: Replace safe_conversion() with check_assign() (Kees) 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 | 17 ++++++++++++++--- 2 files changed, 17 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 bf99d1f02bd9..e6bbc0f8b7e6 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); + WARN_ON(check_assign(offset >> PAGE_SHIFT, &place->fpfn)); + WARN_ON(check_assign(place->fpfn + (size >> PAGE_SHIFT), &place->lpfn)); } 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; + WARN_ON(check_assign(mr->io_size >> PAGE_SHIFT, &place->lpfn)); } } } diff --git a/drivers/gpu/drm/i915/intel_region_ttm.c b/drivers/gpu/drm/i915/intel_region_ttm.c index 575d67bc6ffe..37a964b20b36 100644 --- a/drivers/gpu/drm/i915/intel_region_ttm.c +++ b/drivers/gpu/drm/i915/intel_region_ttm.c @@ -209,14 +209,23 @@ 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 (WARN_ON(check_assign(offset >> PAGE_SHIFT, &place.fpfn))) { + ret = -E2BIG; + goto out; + } + if (WARN_ON(check_assign(place.fpfn + (size >> PAGE_SHIFT), &place.lpfn))) { + 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 (WARN_ON(check_assign(mem->io_size >> PAGE_SHIFT, &place.lpfn))) { + ret = -E2BIG; + goto out; + } } } @@ -224,6 +233,8 @@ 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) -- 2.37.1