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From: Cristian Marussi <cristian.marussi@arm.com>
To: linux-kselftest@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org, shuah@kernel.org
Cc: andreyknvl@google.com, dave.martin@arm.com, amit.kachhap@arm.com
Subject: [PATCH v4 08/11] kselftest: arm64: fake_sigreturn_missing_fpsimd
Date: Fri, 30 Aug 2019 17:42:45 +0100
Message-ID: <20190830164248.16238-9-cristian.marussi@arm.com> (raw)
In-Reply-To: <20190830164248.16238-1-cristian.marussi@arm.com>

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 <cristian.marussi@arm.com>
---
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 <stdio.h>
+#include <signal.h>
+#include <ucontext.h>
+
+#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);
+
+		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,
+};
-- 
2.17.1


  parent reply index

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-30 16:42 [PATCH v4 00/11] Add arm64/signal initial kselftest support Cristian Marussi
2019-08-30 16:42 ` [PATCH v4 01/11] kselftest: arm64: add skeleton Makefile Cristian Marussi
2019-08-30 16:42 ` [PATCH v4 02/11] kselftest: arm64: add common utils and one testcase Cristian Marussi
2019-08-30 16:42 ` [PATCH v4 03/11] kselftest: arm64: mangle_pstate_invalid_daif_bits Cristian Marussi
2019-08-30 16:42 ` [PATCH v4 04/11] kselftest: arm64: mangle_pstate_invalid_mode_el[123][ht] Cristian Marussi
2019-08-30 16:42 ` [PATCH v4 05/11] kselftest: arm64: mangle_pstate_ssbs_regs Cristian Marussi
2019-08-30 16:42 ` [PATCH v4 06/11] kselftest: arm64: fake_sigreturn_bad_magic Cristian Marussi
2019-08-30 16:42 ` [PATCH v4 07/11] kselftest: arm64: fake_sigreturn_bad_size_for_magic0 Cristian Marussi
2019-08-30 16:42 ` Cristian Marussi [this message]
2019-08-30 16:42 ` [PATCH v4 09/11] kselftest: arm64: fake_sigreturn_duplicated_fpsimd Cristian Marussi
2019-08-30 16:42 ` [PATCH v4 10/11] kselftest: arm64: fake_sigreturn_bad_size Cristian Marussi
2019-08-30 16:42 ` [PATCH v4 11/11] kselftest: arm64: fake_sigreturn_misaligned_sp Cristian Marussi

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