From patchwork Thu Nov 3 14:51:38 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mauro Carvalho Chehab X-Patchwork-Id: 621929 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 B7F97C4321E for ; Thu, 3 Nov 2022 14:51:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231783AbiKCOv5 (ORCPT ); Thu, 3 Nov 2022 10:51:57 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35976 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231776AbiKCOvr (ORCPT ); Thu, 3 Nov 2022 10:51:47 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5F3C918B30; Thu, 3 Nov 2022 07:51:46 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 10DE5B828B4; Thu, 3 Nov 2022 14:51:45 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3AC02C43143; Thu, 3 Nov 2022 14:51:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1667487103; bh=1ynZM90FVuDLUm6Ak2G09DB3URFnKUrvlsBGn1ucYXw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=JyRr6wkpdyrB+4wxOYn8KaoaZBO7VBziswzVB1HZ1YrOkxCzbS5gSVYEDEKL0/NM/ tv+O6T4EKN1qyE+TuPm/P3bSTS75P5h5qczWaX//RCbAZqGfFXwhpl2ci3+fVYscM9 MjUcHB8WrhDFP6HvOvgMvUy4LMlX8TDzd+duVGS2fWp0jrY2wlF01O9Bye7eerkqFp WKff862tjqqjsnsVuZlb+8G27tDnTM3V5XjA8V5a+oYeFsYnHvz4wgXN4O4N7sMryA GeQgiIPWXkz4q29z8ZFVGRZxAvIPooFutsGc4Kww5k+VrVbAuMJvIhXTUBVeTPSO1d DEnKH2009KERQ== Received: from mchehab by mail.kernel.org with local (Exim 4.96) (envelope-from ) id 1oqbZE-0076bD-0V; Thu, 03 Nov 2022 14:51:40 +0000 From: Mauro Carvalho Chehab Cc: Mauro Carvalho Chehab , =?utf-8?q?Christian_K=C3=B6n?= =?utf-8?q?ig?= , "Daniel Latypov" , "Isabella Basso" , =?utf-8?q?Micha=C5=82_Winiarski?= , =?utf-8?q?T?= =?utf-8?q?homas_Hellstr=C3=B6m?= , Daniel Vetter , David Airlie , Jani Nikula , Joonas Lahtinen , Matt Roper , Matthew Auld , Rodrigo Vivi , Tvrtko Ursulin , dri-devel@lists.freedesktop.org, igt-dev@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, skhan@linuxfoundation.org Subject: [PATCH RFC v2 8/8] drm/i915: check if current->mm is not NULL Date: Thu, 3 Nov 2022 14:51:38 +0000 Message-Id: X-Mailer: git-send-email 2.38.1 In-Reply-To: References: MIME-Version: 1.0 To: unlisted-recipients:; (no To-header on input) Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org The mmap tests require mm in order to work. Failing to do that will cause a crash: [ 316.820722] BUG: kernel NULL pointer dereference, address: 00000000000000e8 [ 316.822517] #PF: supervisor write access in kernel mode [ 316.823430] #PF: error_code(0x0002) - not-present page [ 316.824390] PGD 0 P4D 0 [ 316.825357] Oops: 0002 [#1] PREEMPT SMP NOPTI [ 316.826350] CPU: 0 PID: 1517 Comm: kunit_try_catch Tainted: G U N 6.1.0-rc2-drm-266703e6f163+ #14 [ 316.827503] Hardware name: Intel Corporation Tiger Lake Client Platform/TigerLake Y LPDDR4x T4 Crb, BIOS TGLSFWI1.R00.3243.A01.2006102133 06/10/2020 [ 316.828633] RIP: 0010:down_write_killable+0x50/0x110 [ 316.829756] Code: 24 10 45 31 c9 31 c9 41 b8 01 00 00 00 31 d2 31 f6 48 89 ef e8 e1 74 4a ff bf 01 00 00 00 e8 87 d6 46 ff 31 c0 ba 01 00 00 00 48 0f b1 13 0f 94 c0 5a 84 c0 74 62 8b 05 49 12 e4 00 85 c0 74 [ 316.830896] RSP: 0018:ffffc90001eabc58 EFLAGS: 00010246 [ 316.832008] RAX: 0000000000000000 RBX: 00000000000000e8 RCX: 0000000000000000 [ 316.833141] RDX: 0000000000000001 RSI: ffffffff81c94fc9 RDI: ffffffff81c94fc9 [ 316.834195] RBP: 0000000000000158 R08: 0000000000000001 R09: 0000000000000000 [ 316.835231] R10: 0000000000000000 R11: ffff8883a13350b8 R12: 0000000000000002 [ 316.836259] R13: 0000000000000001 R14: 0000000000100000 R15: 00000000000000e8 [ 316.837237] FS: 0000000000000000(0000) GS:ffff8883a3800000(0000) knlGS:0000000000000000 [ 316.838214] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 316.839190] CR2: 00000000000000e8 CR3: 0000000002812003 CR4: 0000000000770ef0 [ 316.840147] PKRU: 55555554 [ 316.841099] Call Trace: [ 316.842047] [ 316.842990] ? vm_mmap_pgoff+0x78/0x150 [ 316.843936] vm_mmap_pgoff+0x78/0x150 [ 316.844884] igt_mmap_offset+0x178/0x1b9 [i915] [ 316.846119] __igt_mmap+0xfe/0x680 [i915] Unfortunately, when KUnit module runs, it doesn't create an user context, causing mmap tests to fail. Signed-off-by: Mauro Carvalho Chehab --- To avoid mailbombing on a large number of people, only mailing lists were C/C on the cover. See [PATCH RFC v2 0/8] at: https://lore.kernel.org/all/cover.1667486144.git.mchehab@kernel.org/ drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c b/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c index add5ae56cd89..2c5f93e946b5 100644 --- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c +++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c @@ -1845,6 +1845,11 @@ int i915_gem_mman_live_selftests(struct drm_i915_private *i915) SUBTEST(igt_mmap_gpu), }; + if (!current->mm) { + pr_err("Test called without an user context!\n"); + return -EINVAL; + } + return i915_live_subtests(tests, i915); } EXPORT_SYMBOL_NS_GPL(i915_gem_mman_live_selftests, I915_SELFTEST);