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Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1i5Tny-0007Lz-Rc; Wed, 04 Sep 2019 11:50:30 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1i5Tmw-0005Mm-L6 for linux-arm-kernel@lists.infradead.org; Wed, 04 Sep 2019 11:49:28 +0000 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 5B257337; Wed, 4 Sep 2019 04:49:26 -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 73BDA3F246; Wed, 4 Sep 2019 04:49:25 -0700 (PDT) Date: Wed, 4 Sep 2019 12:49:23 +0100 From: Dave Martin To: Cristian Marussi Subject: Re: [PATCH v5 09/11] kselftest: arm64: fake_sigreturn_duplicated_fpsimd Message-ID: <20190904114923.GZ27757@arm.com> References: <20190902112932.36129-1-cristian.marussi@arm.com> <20190902112932.36129-10-cristian.marussi@arm.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20190902112932.36129-10-cristian.marussi@arm.com> User-Agent: Mutt/1.5.23 (2014-03-12) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190904_044926_783574_EC776A4B X-CRM114-Status: GOOD ( 19.95 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: amit.kachhap@arm.com, andreyknvl@google.com, shuah@kernel.org, linux-arm-kernel@lists.infradead.org, linux-kselftest@vger.kernel.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Mon, Sep 02, 2019 at 12:29:30pm +0100, Cristian Marussi wrote: > Add a simple fake_sigreturn testcase which builds a ucontext_t with > an anomalous additional fpsimd_context and place it onto the stack. > Expects a SIGSEGV on test PASS. > > Signed-off-by: Cristian Marussi > --- > v3 --> v4 > - fix commit > - missing include > - using new get_starting_head() helper > - added test description > --- > .../fake_sigreturn_duplicated_fpsimd.c | 52 +++++++++++++++++++ > 1 file changed, 52 insertions(+) > create mode 100644 tools/testing/selftests/arm64/signal/testcases/fake_sigreturn_duplicated_fpsimd.c > > diff --git a/tools/testing/selftests/arm64/signal/testcases/fake_sigreturn_duplicated_fpsimd.c b/tools/testing/selftests/arm64/signal/testcases/fake_sigreturn_duplicated_fpsimd.c > new file mode 100644 > index 000000000000..c7122c44f53f > --- /dev/null > +++ b/tools/testing/selftests/arm64/signal/testcases/fake_sigreturn_duplicated_fpsimd.c > @@ -0,0 +1,52 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * Copyright (C) 2019 ARM Limited > + * > + * Place a fake sigframe on the stack including an additional FPSIMD > + * record: on sigreturn Kernel must spot this attempt and the test > + * case is expected to be terminated via SEGV. > + */ > + > +#include > +#include > + > +#include "test_signals_utils.h" > +#include "testcases.h" > + > +struct fake_sigframe sf; > + > +static int fake_sigreturn_duplicated_fpsimd_run(struct tdescr *td, > + siginfo_t *si, ucontext_t *uc) > +{ > + size_t resv_sz, need_sz; > + struct _aarch64_ctx *shead = GET_SF_RESV_HEAD(sf), *head; > + > + /* 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); > + need_sz = HDR_SZ + sizeof(struct fpsimd_context); Nit: Maybe write this sum in the same order as the records we're going o append, i.e.: need_sz = sizeof(struct fpsimd_context) + HDR_SZ; /* for terminator */ Also, maybe fail this test if there is no fpsimd_context in the initial frame from get_current_context(): that would be a kernel bug, but we wouldn't be giving fake_sigreturn() duplicate fpsimd_contexts in that case -- so this test wouldn't test the thing it's supposed to test. > + > + head = get_starting_head(shead, need_sz, resv_sz, NULL); > + if (head) { > + /* Add a spurios fpsimd_context */ > + head->magic = FPSIMD_MAGIC; > + head->size = sizeof(struct fpsimd_context); > + /* and terminate */ > + write_terminator_record(GET_RESV_NEXT_HEAD(head)); > + > + ASSERT_BAD_CONTEXT(&sf.uc); > + fake_sigreturn(&sf, sizeof(sf), 0); > + } > + > + return 1; [...] Cheers ---Dave _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel