From patchwork Fri Sep 9 10:59:10 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: 12971538 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 9AE17ECAAA1 for ; Fri, 9 Sep 2022 11:01:06 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 7038010EC85; Fri, 9 Sep 2022 11:00:25 +0000 (UTC) Received: from mga06.intel.com (mga06b.intel.com [134.134.136.31]) by gabe.freedesktop.org (Postfix) with ESMTPS id 2AF1310EC77; Fri, 9 Sep 2022 11:00:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1662721200; x=1694257200; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=nn1a9tFrsZga0A6pfl0862R63n1W3dcE7KCEwy2yz0Y=; b=TJ6g2816M1Fsawt8Aw7pJBzfaB2mdcCGaRoGFSGj0YSdNcCTTcuD4D6I tij3QmZNDQTfmncyHA66HIOVg9s1VWvOewIdjuQF0AzNltHL5r9KR0poU eD6C1zTd3PTgZFRBHmUgQ5WVe/7eZN2Pvlr22hnkd6w60HtqqpXsccdD0 3TxLv9/M8UnXxo1GE9FCcvEEWo4ATtzHaM7GhjgzBTSFZN3itBHdSjTLl Iulf0x0+nHf+aUKlFcAK9zKI9MNp+Vf7wCQVgBLtz2SZqxG79rKG9bY6G uNotwNSOdzOZiOkx12XPpCtADv5HR+CQoPg8dOrEbYtRFV1KAvVmClh67 Q==; X-IronPort-AV: E=McAfee;i="6500,9779,10464"; a="359174691" X-IronPort-AV: E=Sophos;i="5.93,303,1654585200"; d="scan'208";a="359174691" Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by orsmga104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 Sep 2022 03:59:59 -0700 X-IronPort-AV: E=Sophos;i="5.93,303,1654585200"; d="scan'208";a="704370380" Received: from clbarnes-mobl.amr.corp.intel.com (HELO paris.amr.corp.intel.com) ([10.254.42.92]) by fmsmga003-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 Sep 2022 03:59:56 -0700 From: Gwan-gyeong Mun To: intel-gfx@lists.freedesktop.org Date: Fri, 9 Sep 2022 19:59:10 +0900 Message-Id: <20220909105913.752049-7-gwan-gyeong.mun@intel.com> X-Mailer: git-send-email 2.37.1 In-Reply-To: <20220909105913.752049-1-gwan-gyeong.mun@intel.com> References: <20220909105913.752049-1-gwan-gyeong.mun@intel.com> MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH v10 6/9] 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, keescook@chromium.org, jani.nikula@intel.com, ndesaulniers@google.com, dlatypov@google.com, linux@rasmusvillemoes.dk, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, chris@chris-wilson.co.uk, andrzej.hajda@intel.com, matthew.auld@intel.com, daniel@ffwll.ch, airlied@redhat.com, mchehab@kernel.org, vitor@massaru.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) 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 06a2e80a5702..6956d273fa5f 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)