Added a simple mangle testcase which messes with the ucontext_t
from within the sig_handler, trying to badly modify the PC to point
toward Kernel land.
Expects SIGSEGV on test PASS.
Signed-off-by: Cristian Marussi <cristian.marussi@xxxxxxx>
---
.../arm64/signal/testcases/.gitignore | 1 +
.../signal/testcases/mangle_pc_invalid.c | 24 +++++++++++++++++++
2 files changed, 25 insertions(+)
create mode 100644 tools/testing/selftests/arm64/signal/testcases/mangle_pc_invalid.c
diff --git a/tools/testing/selftests/arm64/signal/testcases/.gitignore b/tools/testing/selftests/arm64/signal/testcases/.gitignore
index 7f7414d241f2..a87fb0f0d2cf 100644
--- a/tools/testing/selftests/arm64/signal/testcases/.gitignore
+++ b/tools/testing/selftests/arm64/signal/testcases/.gitignore
@@ -1 +1,2 @@
mangle_sp_misaligned
+mangle_pc_invalid
diff --git a/tools/testing/selftests/arm64/signal/testcases/mangle_pc_invalid.c b/tools/testing/selftests/arm64/signal/testcases/mangle_pc_invalid.c
new file mode 100644
index 000000000000..0024032528bc
--- /dev/null
+++ b/tools/testing/selftests/arm64/signal/testcases/mangle_pc_invalid.c
@@ -0,0 +1,24 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (C) 2019 ARM Limited */
+
+#include "test_signals_utils.h"
+#include "testcases.h"
+
+static int mangle_invalid_pc_run(struct tdescr *td, siginfo_t *si,
+ ucontext_t *uc)
+{
+ ASSERT_GOOD_CONTEXT(uc);
+
+ uc->uc_mcontext.pc = 0xffffffffcccccccc;
+
+ return 1;
+}
+
+struct tdescr tde = {
+ .sanity_disabled = true,
+ .name = "MANGLE_PC_INVALID",
+ .descr = "Mangling uc_mcontext with INVALID PC",
+ .sig_trig = SIGUSR1,
+ .sig_ok = SIGSEGV,
+ .run = mangle_invalid_pc_run,
+};
--
2.17.1
