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 X-Spam-Level: X-Spam-Status: No, score=-8.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A6461C3A5A7 for ; Wed, 4 Sep 2019 11:49:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8466820820 for ; Wed, 4 Sep 2019 11:49:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729356AbfIDLtO (ORCPT ); Wed, 4 Sep 2019 07:49:14 -0400 Received: from foss.arm.com ([217.140.110.172]:52740 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727125AbfIDLtO (ORCPT ); Wed, 4 Sep 2019 07:49:14 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 609BE337; Wed, 4 Sep 2019 04:49:13 -0700 (PDT) Received: from arm.com (usa-sjc-imap-foss1.foss.arm.com [10.121.207.14]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 78C983F246; Wed, 4 Sep 2019 04:49:12 -0700 (PDT) Date: Wed, 4 Sep 2019 12:49:10 +0100 From: Dave Martin To: Cristian Marussi Cc: linux-kselftest@vger.kernel.org, linux-arm-kernel@lists.infradead.org, shuah@kernel.org, amit.kachhap@arm.com, andreyknvl@google.com Subject: Re: [PATCH v5 08/11] kselftest: arm64: fake_sigreturn_missing_fpsimd Message-ID: <20190904114910.GY27757@arm.com> References: <20190902112932.36129-1-cristian.marussi@arm.com> <20190902112932.36129-9-cristian.marussi@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190902112932.36129-9-cristian.marussi@arm.com> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kselftest-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org On Mon, Sep 02, 2019 at 12:29:29pm +0100, Cristian Marussi wrote: > Add a simple fake_sigreturn testcase which builds a ucontext_t without > the required fpsimd_context and place it onto the stack. > Expects a SIGSEGV on test PASS. > > Signed-off-by: Cristian Marussi > --- > v3 --> v4 > - fix commit > - added signal.h > - added test description > --- > .../testcases/fake_sigreturn_missing_fpsimd.c | 50 +++++++++++++++++++ > 1 file changed, 50 insertions(+) > create mode 100644 tools/testing/selftests/arm64/signal/testcases/fake_sigreturn_missing_fpsimd.c > > diff --git a/tools/testing/selftests/arm64/signal/testcases/fake_sigreturn_missing_fpsimd.c b/tools/testing/selftests/arm64/signal/testcases/fake_sigreturn_missing_fpsimd.c > new file mode 100644 > index 000000000000..08ecd8073a1a > --- /dev/null > +++ b/tools/testing/selftests/arm64/signal/testcases/fake_sigreturn_missing_fpsimd.c > @@ -0,0 +1,50 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * Copyright (C) 2019 ARM Limited > + * > + * Place a fake sigframe on the stack missing the mandatory FPSIMD > + * record: on sigreturn Kernel must spot this attempt and the test > + * case is expected to be terminated via SEGV. > + */ > + > +#include > +#include > +#include > + > +#include "test_signals_utils.h" > +#include "testcases.h" > + > +struct fake_sigframe sf; > + > +static int fake_sigreturn_missing_fpsimd_run(struct tdescr *td, > + siginfo_t *si, ucontext_t *uc) > +{ > + size_t resv_sz, offset; > + struct _aarch64_ctx *head = GET_SF_RESV_HEAD(sf); > + > + /* just to fill the ucontext_t with something real */ > + if (!get_current_context(td, &sf.uc)) > + return 1; > + > + resv_sz = GET_SF_RESV_SIZE(sf); > + head = get_header(head, FPSIMD_MAGIC, resv_sz, &offset); > + if (head && resv_sz - offset >= HDR_SZ) { > + fprintf(stderr, "Mangling template header. Spare space:%zd\n", > + resv_sz - offset); > + /* Just overwrite fpsmid_context */ > + write_terminator_record(head); Strictly speaking, we may be throwing away more than just the fpsimd_context record here. But I think the test works nonetheless. fpsimd_context is the only record that's mandatory in any case. > + > + ASSERT_BAD_CONTEXT(&sf.uc); > + fake_sigreturn(&sf, sizeof(sf), 0); > + } > + > + return 1; > +} > + > +struct tdescr tde = { > + .name = "FAKE_SIGRETURN_MISSING_FPSIMD", > + .descr = "Triggers a sigreturn with a missing fpsimd_context", > + .sig_ok = SIGSEGV, > + .timeout = 3, > + .run = fake_sigreturn_missing_fpsimd_run, > +}; Assuming the comment I just posted on v3 of this patch makes sense to you, Reviewed-by: Dave Martin