Added a simple fake_sigreturn testcase which builds a ucontext_t
with the whole __reserved area overflowed with ESR_MAGIC headers
and place it onto the stack.
Expects a SIGSEGV on test PASS.
Signed-off-by: Cristian Marussi <cristian.marussi@xxxxxxx>
---
.../arm64/signal/testcases/.gitignore | 1 +
.../fake_sigreturn_overflow_reserved.c | 48 +++++++++++++++++++
2 files changed, 49 insertions(+)
create mode 100644 tools/testing/selftests/arm64/signal/testcases/fake_sigreturn_overflow_reserved.c
diff --git a/tools/testing/selftests/arm64/signal/testcases/.gitignore b/tools/testing/selftests/arm64/signal/testcases/.gitignore
index 66ba865b3b7e..69a18391c220 100644
--- a/tools/testing/selftests/arm64/signal/testcases/.gitignore
+++ b/tools/testing/selftests/arm64/signal/testcases/.gitignore
@@ -10,3 +10,4 @@ fake_sigreturn_misaligned
fake_sigreturn_bad_magic
fake_sigreturn_bad_size
fake_sigreturn_bad_size_for_magic0
+fake_sigreturn_overflow_reserved
diff --git a/tools/testing/selftests/arm64/signal/testcases/fake_sigreturn_overflow_reserved.c b/tools/testing/selftests/arm64/signal/testcases/fake_sigreturn_overflow_reserved.c
new file mode 100644
index 000000000000..eba109453a65
--- /dev/null
+++ b/tools/testing/selftests/arm64/signal/testcases/fake_sigreturn_overflow_reserved.c
@@ -0,0 +1,48 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (C) 2019 ARM Limited */
+
+#include <asm/sigcontext.h>
+#include <ucontext.h>
+#include <stdio.h>
+
+#include "test_signals_utils.h"
+#include "testcases.h"
+
+struct a_sigframe sf;
+
+static int fake_sigreturn_overflow_reserved_run(struct tdescr *td,
+ siginfo_t *si,
+ ucontext_t *uc)
+{
+ size_t offset = 0;
+ 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;
+
+ /* find the terminator, preserving existig headers */
+ head = get_terminator(head, GET_SF_RESV_SIZE(sf), &offset);
+ if (head) {
+ /* fill the __reserved area till the end */
+ do {
+ head->magic = ESR_MAGIC;
+ head->size = sizeof(struct esr_context);
+ offset += head->size;
+ head = GET_RESV_NEXT_HEAD(head);
+ } while (offset < GET_SF_RESV_SIZE(sf));
+
+ ASSERT_BAD_CONTEXT(&sf.uc);
+ fake_sigreturn(&sf, sizeof(sf), 16);
+ }
+
+ return 1;
+}
+
+struct tdescr tde = {
+ .name = "FAKE_SIGRETURN_OVERFLOW_RESERVED",
+ .descr = "Triggers a fake sigreturn with an overflowed sigframe",
+ .sig_ok = SIGSEGV,
+ .timeout = 3,
+ .run = fake_sigreturn_overflow_reserved_run,
+};
--
2.17.1
