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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 v9 03/12] kselftest: arm64: mangle_pstate_invalid_daif_bits
Date: Wed,  9 Oct 2019 13:04:50 +0100	[thread overview]
Message-ID: <20191009120459.21805-4-cristian.marussi@arm.com> (raw)
In-Reply-To: <20191009120459.21805-1-cristian.marussi@arm.com>

Add a simple mangle testcase which messes with the ucontext_t from within
the signal handler, trying to set PSTATE DAIF bits to an invalid value
(masking everything). Expects SIGSEGV on test PASS.

Reviewed-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
---
v3 --> v4
- fixed commit message
- added testcase comment description
---
 .../mangle_pstate_invalid_daif_bits.c         | 35 +++++++++++++++++++
 1 file changed, 35 insertions(+)
 create mode 100644 tools/testing/selftests/arm64/signal/testcases/mangle_pstate_invalid_daif_bits.c

diff --git a/tools/testing/selftests/arm64/signal/testcases/mangle_pstate_invalid_daif_bits.c b/tools/testing/selftests/arm64/signal/testcases/mangle_pstate_invalid_daif_bits.c
new file mode 100644
index 000000000000..434b82597007
--- /dev/null
+++ b/tools/testing/selftests/arm64/signal/testcases/mangle_pstate_invalid_daif_bits.c
@@ -0,0 +1,35 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2019 ARM Limited
+ *
+ * Try to mangle the ucontext from inside a signal handler, mangling the
+ * DAIF bits in an illegal manner: this attempt must be spotted by Kernel
+ * and the test case is expected to be terminated via SEGV.
+ *
+ */
+
+#include "test_signals_utils.h"
+#include "testcases.h"
+
+static int mangle_invalid_pstate_run(struct tdescr *td, siginfo_t *si,
+				     ucontext_t *uc)
+{
+	ASSERT_GOOD_CONTEXT(uc);
+
+	/*
+	 * This config should trigger a SIGSEGV by Kernel when it checks
+	 * the sigframe consistency in valid_user_regs() routine.
+	 */
+	uc->uc_mcontext.pstate |= PSR_D_BIT | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT;
+
+	return 1;
+}
+
+struct tdescr tde = {
+		.sanity_disabled = true,
+		.name = "MANGLE_PSTATE_INVALID_DAIF_BITS",
+		.descr = "Mangling uc_mcontext with INVALID DAIF_BITS",
+		.sig_trig = SIGUSR1,
+		.sig_ok = SIGSEGV,
+		.run = mangle_invalid_pstate_run,
+};
-- 
2.17.1


  parent reply	other threads:[~2019-10-09 12:05 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-09 12:04 [PATCH v9 00/12] Add arm64/signal initial kselftest support Cristian Marussi
2019-10-09 12:04 ` [PATCH v9 01/12] kselftest: arm64: extend toplevel skeleton Makefile Cristian Marussi
2019-10-09 12:04 ` [PATCH v9 02/12] kselftest: arm64: mangle_pstate_invalid_compat_toggle and common utils Cristian Marussi
2019-10-24 22:41   ` Suzuki K Poulose
2019-10-25  9:56     ` Cristian Marussi
2019-10-09 12:04 ` Cristian Marussi [this message]
2019-10-09 12:04 ` [PATCH v9 04/12] kselftest: arm64: mangle_pstate_invalid_mode_el[123][ht] Cristian Marussi
2019-10-09 12:04 ` [PATCH v9 05/12] kselftest: arm64: extend test_init functionalities Cristian Marussi
2019-10-09 12:04 ` [PATCH v9 06/12] kselftest: arm64: add helper get_current_context Cristian Marussi
2019-10-09 12:04 ` [PATCH v9 07/12] kselftest: arm64: fake_sigreturn_bad_magic Cristian Marussi
2019-10-09 12:04 ` [PATCH v9 08/12] kselftest: arm64: fake_sigreturn_bad_size_for_magic0 Cristian Marussi
2019-10-09 12:04 ` [PATCH v9 09/12] kselftest: arm64: fake_sigreturn_missing_fpsimd Cristian Marussi
2019-10-09 12:04 ` [PATCH v9 10/12] kselftest: arm64: fake_sigreturn_duplicated_fpsimd Cristian Marussi
2019-10-09 12:04 ` [PATCH v9 11/12] kselftest: arm64: fake_sigreturn_bad_size Cristian Marussi
2019-10-09 12:04 ` [PATCH v9 12/12] kselftest: arm64: fake_sigreturn_misaligned_sp Cristian Marussi

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