1 files changed, 102 insertions, 0 deletions

diff --git a/src/regress/lib/libc/sys/t_sigaltstack.c b/src/regress/lib/libc/sys/t_sigaltstack.c
new file mode 100644
index 0000000000..ac02650296
--- /dev/null
+++ b/src/regress/lib/libc/sys/t_sigaltstack.c
@@ -0,0 +1,102 @@
+/*      $OpenBSD: t_sigaltstack.c,v 1.1 2021/09/02 12:40:44 mbuhl Exp $ */
+/* $NetBSD: t_sigaltstack.c,v 1.2 2020/05/01 21:35:30 christos Exp $ */
+
+/*-
+ * Copyright (c) 2020 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+#include "macros.h"
+
+#include <sys/cdefs.h>
+__RCSID("$NetBSD: t_sigaltstack.c,v 1.2 2020/05/01 21:35:30 christos Exp $");
+
+#include <signal.h>
+#include <stdbool.h>
+
+#include "atf-c.h"
+
+#include "h_macros.h"
+
+static stack_t sigstk;
+static bool handler_called;
+static bool handler_use_altstack;
+
+static void
+handler(int signo __unused)
+{
+        char sp[128];
+
+        handler_called = true;
+
+        /* checking if the stack pointer is within the range of altstack */
+        if ((char *)sigstk.ss_sp <= sp &&
+            ((char *)sigstk.ss_sp + sigstk.ss_size) > sp)
+                handler_use_altstack = true;
+        else
+                handler_use_altstack = false;
+}
+
+ATF_TC(sigaltstack_onstack);
+ATF_TC_HEAD(sigaltstack_onstack, tc)
+{
+        atf_tc_set_md_var(tc, "descr",
+            "Checks for using signal stack with SA_ONSTACK");
+}
+
+ATF_TC_BODY(sigaltstack_onstack, tc)
+{
+        struct sigaction sa;
+        int i;
+
+        /* set a signal handler use alternative stack */
+        memset(&sigstk, 0, sizeof(sigstk));
+        sigstk.ss_sp = malloc(SIGSTKSZ);
+        ATF_REQUIRE(sigstk.ss_sp != NULL);
+        sigstk.ss_size = SIGSTKSZ;
+        sigstk.ss_flags = 0;
+        ATF_REQUIRE(sigaltstack(&sigstk, 0) == 0);
+
+        sigemptyset(&sa.sa_mask);
+        sa.sa_handler = handler;
+        sa.sa_flags = SA_ONSTACK;
+        sigaction(SIGUSR1, &sa, NULL);
+
+        /* test several times */
+        for (i = 1; i <= 5; i++) {
+                handler_called = false;
+                kill(getpid(), SIGUSR1);
+
+                if (!handler_called)
+                        atf_tc_fail("signal handler wasn't called (count=%d)", i);
+                if (!handler_use_altstack)
+                        atf_tc_fail("alternative stack wasn't used (count=%d)", i);
+        }
+}
+
+ATF_TP_ADD_TCS(tp)
+{
+        ATF_TP_ADD_TC(tp, sigaltstack_onstack);
+
+        return atf_no_error();
+}