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Index: head/sys/arm/arm/machdep.c
===================================================================
--- head/sys/arm/arm/machdep.c
+++ head/sys/arm/arm/machdep.c
@@ -653,9 +653,9 @@
#endif
frame.sf_si = ksi->ksi_info;
frame.sf_uc.uc_sigmask = *mask;
- frame.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK )
- ? ((onstack) ? SS_ONSTACK : 0) : SS_DISABLE;
frame.sf_uc.uc_stack = td->td_sigstk;
+ frame.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) != 0 ?
+ (onstack ? SS_ONSTACK : 0) : SS_DISABLE;
mtx_unlock(&psp->ps_mtx);
PROC_UNLOCK(td->td_proc);
Index: head/sys/arm64/arm64/machdep.c
===================================================================
--- head/sys/arm64/arm64/machdep.c
+++ head/sys/arm64/arm64/machdep.c
@@ -661,9 +661,9 @@
get_fpcontext(td, &frame.sf_uc.uc_mcontext);
frame.sf_si = ksi->ksi_info;
frame.sf_uc.uc_sigmask = *mask;
- frame.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) ?
- ((onstack) ? SS_ONSTACK : 0) : SS_DISABLE;
frame.sf_uc.uc_stack = td->td_sigstk;
+ frame.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) != 0 ?
+ (onstack ? SS_ONSTACK : 0) : SS_DISABLE;
mtx_unlock(&psp->ps_mtx);
PROC_UNLOCK(td->td_proc);
Index: head/sys/riscv/riscv/machdep.c
===================================================================
--- head/sys/riscv/riscv/machdep.c
+++ head/sys/riscv/riscv/machdep.c
@@ -587,9 +587,9 @@
get_fpcontext(td, &frame.sf_uc.uc_mcontext);
frame.sf_si = ksi->ksi_info;
frame.sf_uc.uc_sigmask = *mask;
- frame.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) ?
- ((onstack) ? SS_ONSTACK : 0) : SS_DISABLE;
frame.sf_uc.uc_stack = td->td_sigstk;
+ frame.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) != 0 ?
+ (onstack ? SS_ONSTACK : 0) : SS_DISABLE;
mtx_unlock(&psp->ps_mtx);
PROC_UNLOCK(td->td_proc);
Index: head/tests/sys/kern/Makefile
===================================================================
--- head/tests/sys/kern/Makefile
+++ head/tests/sys/kern/Makefile
@@ -10,6 +10,7 @@
ATF_TESTS_C+= ptrace_test
TEST_METADATA.ptrace_test+= timeout="15"
ATF_TESTS_C+= reaper
+ATF_TESTS_C+= sigaltstack
PLAIN_TESTS_C+= subr_unit_test
ATF_TESTS_C+= sys_getrandom
ATF_TESTS_C+= unix_passfd_test
Index: head/tests/sys/kern/sigaltstack.c
===================================================================
--- head/tests/sys/kern/sigaltstack.c
+++ head/tests/sys/kern/sigaltstack.c
@@ -0,0 +1,115 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2018 Eric van Gyzen
+ *
+ * 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 AUTHOR 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 AUTHOR 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 <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <atf-c.h>
+#include <errno.h>
+#include <signal.h>
+#include <stdbool.h>
+#include <stdlib.h>
+
+/*
+ * TODO add tests for:
+ *
+ * - all error cases
+ * - SS_DISABLE
+ * - no effect without SA_ONSTACK
+ */
+
+static sig_atomic_t disabled_correct = 1;
+static sig_atomic_t level1_correct = -1;
+static sig_atomic_t level2_correct = -1;
+
+static void
+sig_handler(int signo, siginfo_t *info __unused, void *ucp)
+{
+ ucontext_t *uc = ucp;
+
+ // The alternate signal stack is enabled.
+ disabled_correct = disabled_correct &&
+ (uc->uc_stack.ss_flags & SS_DISABLE) == 0;
+ if (signo == SIGUSR1) {
+ // The thread was NOT running on the alternate signal
+ // stack when this signal arrived.
+ level1_correct = (uc->uc_stack.ss_flags & SS_ONSTACK) == 0;
+ raise(SIGUSR2);
+ } else {
+ // The thread WAS running on the alternate signal
+ // stack when this signal arrived.
+ level2_correct = (uc->uc_stack.ss_flags & SS_ONSTACK) != 0;
+ }
+}
+
+ATF_TC(ss_onstack);
+
+ATF_TC_HEAD(ss_onstack, tc)
+{
+
+ atf_tc_set_md_var(tc, "descr", "Test reporting of SS_ONSTACK");
+}
+
+ATF_TC_BODY(ss_onstack, tc)
+{
+ stack_t ss = {
+ .ss_size = SIGSTKSZ,
+ };
+ stack_t oss = {0};
+
+ ss.ss_sp = malloc(ss.ss_size);
+ ATF_REQUIRE(ss.ss_sp != NULL);
+ ATF_REQUIRE(sigaltstack(&ss, &oss) == 0);
+
+ // There should be no signal stack currently configured.
+ ATF_CHECK(oss.ss_sp == NULL);
+ ATF_CHECK(oss.ss_size == 0);
+ ATF_CHECK((oss.ss_flags & SS_DISABLE) != 0);
+ ATF_CHECK((oss.ss_flags & SS_ONSTACK) == 0);
+
+ struct sigaction sa = {
+ .sa_sigaction = sig_handler,
+ .sa_flags = SA_ONSTACK | SA_SIGINFO,
+ };
+ ATF_REQUIRE(sigemptyset(&sa.sa_mask) == 0);
+ ATF_REQUIRE(sigaction(SIGUSR1, &sa, NULL) == 0);
+ ATF_REQUIRE(sigaction(SIGUSR2, &sa, NULL) == 0);
+ ATF_REQUIRE(raise(SIGUSR1) == 0);
+
+ ATF_CHECK(level1_correct != -1);
+ ATF_CHECK(level1_correct == 1);
+ ATF_CHECK(level2_correct != -1);
+ ATF_CHECK(level2_correct == 1);
+}
+
+ATF_TP_ADD_TCS(tp)
+{
+
+ ATF_TP_ADD_TC(tp, ss_onstack);
+
+ return (atf_no_error());
+}

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