From patchwork Fri Aug 2 17:03:00 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Cristian Marussi X-Patchwork-Id: 11073949 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 4A2B117E0 for ; Fri, 2 Aug 2019 17:03:43 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 3DEB828712 for ; Fri, 2 Aug 2019 17:03:43 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 3BF84288C5; Fri, 2 Aug 2019 17:03:43 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id B014328712 for ; Fri, 2 Aug 2019 17:03:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2403887AbfHBRDm (ORCPT ); Fri, 2 Aug 2019 13:03:42 -0400 Received: from foss.arm.com ([217.140.110.172]:55102 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2403896AbfHBRDm (ORCPT ); Fri, 2 Aug 2019 13:03:42 -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 EC2F51570; Fri, 2 Aug 2019 10:03:41 -0700 (PDT) Received: from e120937-lin.cambridge.arm.com (e120937-lin.cambridge.arm.com [10.1.197.50]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 27F743F575; Fri, 2 Aug 2019 10:03:41 -0700 (PDT) From: Cristian Marussi To: linux-kselftest@vger.kernel.org, linux-arm-kernel@lists.infradead.org, shuah@kernel.org Cc: andreyknvl@google.com, dave.martin@arm.com Subject: [PATCH v3 11/11] kselftest: arm64: fake_sigreturn_misaligned_sp Date: Fri, 2 Aug 2019 18:03:00 +0100 Message-Id: <20190802170300.20662-12-cristian.marussi@arm.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190802170300.20662-1-cristian.marussi@arm.com> References: <20190802170300.20662-1-cristian.marussi@arm.com> Sender: linux-kselftest-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Added a simple fake_sigreturn testcase which places a valid sigframe on a non-16 bytes aligned SP. fake_sigretrun() helper function has been patched accordingly to support placing a sigframe on a non-16 bytes aligned address. Expects a SIGSEGV on test PASS. Adds also a test TODO lists holding some further test ideas. Signed-off-by: Cristian Marussi --- Re-added this text after fixing the forced misaglinment procedure in fake_sigreturn() itself: require a ZERO alignment and you'll get your sigframe placed on a misaligned SP (2-bytes off the 16-align) --- .../testing/selftests/arm64/signal/signals.S | 21 +++++++++---- .../arm64/signal/testcases/TODO.readme | 8 +++++ .../testcases/fake_sigreturn_misaligned_sp.c | 30 +++++++++++++++++++ 3 files changed, 53 insertions(+), 6 deletions(-) create mode 100644 tools/testing/selftests/arm64/signal/testcases/TODO.readme create mode 100644 tools/testing/selftests/arm64/signal/testcases/fake_sigreturn_misaligned_sp.c diff --git a/tools/testing/selftests/arm64/signal/signals.S b/tools/testing/selftests/arm64/signal/signals.S index 6262b877400b..2099871176ed 100644 --- a/tools/testing/selftests/arm64/signal/signals.S +++ b/tools/testing/selftests/arm64/signal/signals.S @@ -13,19 +13,28 @@ call_fmt: .globl fake_sigreturn -/* fake_sigreturn x0:&sigframe, x1:sigframe_size, x2:alignment_SP */ +/* fake_sigreturn x0:&sigframe, x1:sigframe_sz, x2:align */ fake_sigreturn: - mov x20, x0 - mov x21, x1 - mov x22, x2 - mov x23, sp - /* create space on the stack for fake sigframe..."x22"-aligned */ + /* Save args and decide which aligment to enforce */ + mov x23, sp + mov x20, x0 + mov x21, x1 + /* x22 and x24 used for forcing alignment or misalignment */ + mov x22, x2 + mov x24, #0 + cbnz x22, 1f + mov x22, #16 + mov x24, #2 + +1: /* create space on the stack for fake sigframe..."x22"-aligned */ mov x0, #0 add x0, x21, x22 sub x22, x22, #1 bic x0, x0, x22 sub x23, x23, x0 + /* force misaligned by x24 bytes if required alignment was zero */ + add x23, x23, x24 ldr x0, =call_fmt mov x1, x21 diff --git a/tools/testing/selftests/arm64/signal/testcases/TODO.readme b/tools/testing/selftests/arm64/signal/testcases/TODO.readme new file mode 100644 index 000000000000..5c949492e7ab --- /dev/null +++ b/tools/testing/selftests/arm64/signal/testcases/TODO.readme @@ -0,0 +1,8 @@ +Some more possible ideas for signals tests: + +- fake_sigreturn_unmapped_sp +- fake_sigreturn_kernelspace_sp +- fake_sigreturn_sve_bad_extra_context +- mangle_sve_invalid_extra_context +- mangle_pstate_invalid_el for H modes (+ macroization ?) +- fake_sigreturn_overflow_reserved diff --git a/tools/testing/selftests/arm64/signal/testcases/fake_sigreturn_misaligned_sp.c b/tools/testing/selftests/arm64/signal/testcases/fake_sigreturn_misaligned_sp.c new file mode 100644 index 000000000000..3ee8c500c7d1 --- /dev/null +++ b/tools/testing/selftests/arm64/signal/testcases/fake_sigreturn_misaligned_sp.c @@ -0,0 +1,30 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Copyright (C) 2019 ARM Limited */ + +#include + +#include "test_signals_utils.h" +#include "testcases.h" + +struct fake_sigframe sf; + +static int fake_sigreturn_misaligned_run(struct tdescr *td, + siginfo_t *si, ucontext_t *uc) +{ + /* just to fill the ucontext_t with something real */ + if (!get_current_context(td, &sf.uc)) + return 1; + + /* Forcing sigframe on misaligned (=!16) SP */ + fake_sigreturn(&sf, sizeof(sf), 0); + + return 1; +} + +struct tdescr tde = { + .name = "FAKE_SIGRETURN_MISALIGNED_SP", + .descr = "Triggers a fake sigreturn with a misaligned sigframe on SP", + .sig_ok = SIGSEGV, + .timeout = 3, + .run = fake_sigreturn_misaligned_run, +};