Thread (37 messages) 37 messages, 2 authors, 2019-07-03

Re: [PATCH 07/13] kselftest: arm64: mangle_pstate_invalid_mode_el?

From: Dave Martin <Dave.Martin@arm.com>
Date: 2019-06-21 10:40:10
Also in: linux-kselftest

^ Subject line seems to end with a ?

Typo?

On Thu, Jun 13, 2019 at 12:13:29PM +0100, Cristian Marussi wrote:
Added 3 simple mangle testcases that mess with the ucontext_t
from within the sig_handler, trying to toggle PSTATE mode bits to
trick the system into switching to EL1/EL2/EL3.
Expects SIGSEGV on test PASS.
For good measure, we may as well also test for the "h" modes.

I wonder whether this can be macro-ised somehow, since the tests are
identical except for the pstate mode field value and the name?
quoted hunk ↗ jump to hunk
Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
---
 .../arm64/signal/testcases/.gitignore         |  3 +++
 .../mangle_pstate_invalid_mode_el1.c          | 25 +++++++++++++++++++
 .../mangle_pstate_invalid_mode_el2.c          | 25 +++++++++++++++++++
 .../mangle_pstate_invalid_mode_el3.c          | 25 +++++++++++++++++++
 4 files changed, 78 insertions(+)
 create mode 100644 tools/testing/selftests/arm64/signal/testcases/mangle_pstate_invalid_mode_el1.c
 create mode 100644 tools/testing/selftests/arm64/signal/testcases/mangle_pstate_invalid_mode_el2.c
 create mode 100644 tools/testing/selftests/arm64/signal/testcases/mangle_pstate_invalid_mode_el3.c
diff --git a/tools/testing/selftests/arm64/signal/testcases/.gitignore b/tools/testing/selftests/arm64/signal/testcases/.gitignore
index 91f7aee4b666..e7a1d998b650 100644
--- a/tools/testing/selftests/arm64/signal/testcases/.gitignore
+++ b/tools/testing/selftests/arm64/signal/testcases/.gitignore
@@ -2,3 +2,6 @@ mangle_sp_misaligned
 mangle_pc_invalid
 mangle_pstate_invalid_daif_bits
 mangle_pstate_invalid_state_toggle
+mangle_pstate_invalid_mode_el1
+mangle_pstate_invalid_mode_el2
+mangle_pstate_invalid_mode_el3
diff --git a/tools/testing/selftests/arm64/signal/testcases/mangle_pstate_invalid_mode_el1.c b/tools/testing/selftests/arm64/signal/testcases/mangle_pstate_invalid_mode_el1.c
new file mode 100644
index 000000000000..9f5bde2e287f
--- /dev/null
+++ b/tools/testing/selftests/arm64/signal/testcases/mangle_pstate_invalid_mode_el1.c
@@ -0,0 +1,25 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (C) 2019 ARM Limited */
+
+#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 */
+	uc->uc_mcontext.pstate |= PSR_MODE_EL1t;
For cleanliness, should we mask out the old mode field first, even if
we expect it to be initiall zero?

[...]

Cheers
---Dave

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