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-rw-r--r--tools/testing/selftests/powerpc/signal/.gitignore1
-rw-r--r--tools/testing/selftests/powerpc/signal/Makefile4
-rw-r--r--tools/testing/selftests/powerpc/signal/settings1
-rw-r--r--tools/testing/selftests/powerpc/signal/sigreturn_vdso.c127
4 files changed, 132 insertions, 1 deletions
diff --git a/tools/testing/selftests/powerpc/signal/.gitignore b/tools/testing/selftests/powerpc/signal/.gitignore
index f897b55a44dd..405b5364044c 100644
--- a/tools/testing/selftests/powerpc/signal/.gitignore
+++ b/tools/testing/selftests/powerpc/signal/.gitignore
@@ -2,3 +2,4 @@
signal
signal_tm
sigfuz
+sigreturn_vdso
diff --git a/tools/testing/selftests/powerpc/signal/Makefile b/tools/testing/selftests/powerpc/signal/Makefile
index 113838fbbe7f..932a032bf036 100644
--- a/tools/testing/selftests/powerpc/signal/Makefile
+++ b/tools/testing/selftests/powerpc/signal/Makefile
@@ -1,10 +1,12 @@
# SPDX-License-Identifier: GPL-2.0
-TEST_GEN_PROGS := signal signal_tm sigfuz
+TEST_GEN_PROGS := signal signal_tm sigfuz sigreturn_vdso
CFLAGS += -maltivec
$(OUTPUT)/signal_tm: CFLAGS += -mhtm
$(OUTPUT)/sigfuz: CFLAGS += -pthread -m64
+TEST_FILES := settings
+
top_srcdir = ../../../../..
include ../../lib.mk
diff --git a/tools/testing/selftests/powerpc/signal/settings b/tools/testing/selftests/powerpc/signal/settings
new file mode 100644
index 000000000000..e7b9417537fb
--- /dev/null
+++ b/tools/testing/selftests/powerpc/signal/settings
@@ -0,0 +1 @@
+timeout=0
diff --git a/tools/testing/selftests/powerpc/signal/sigreturn_vdso.c b/tools/testing/selftests/powerpc/signal/sigreturn_vdso.c
new file mode 100644
index 000000000000..e282fff0fe25
--- /dev/null
+++ b/tools/testing/selftests/powerpc/signal/sigreturn_vdso.c
@@ -0,0 +1,127 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Test that we can take signals with and without the VDSO mapped, which trigger
+ * different paths in the signal handling code.
+ *
+ * See handle_rt_signal64() and setup_trampoline() in signal_64.c
+ */
+
+#define _GNU_SOURCE
+
+#include <errno.h>
+#include <stdio.h>
+#include <signal.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/mman.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+// Ensure assert() is not compiled out
+#undef NDEBUG
+#include <assert.h>
+
+#include "utils.h"
+
+static int search_proc_maps(char *needle, unsigned long *low, unsigned long *high)
+{
+ unsigned long start, end;
+ static char buf[4096];
+ char name[128];
+ FILE *f;
+ int rc = -1;
+
+ f = fopen("/proc/self/maps", "r");
+ if (!f) {
+ perror("fopen");
+ return -1;
+ }
+
+ while (fgets(buf, sizeof(buf), f)) {
+ rc = sscanf(buf, "%lx-%lx %*c%*c%*c%*c %*x %*d:%*d %*d %127s\n",
+ &start, &end, name);
+ if (rc == 2)
+ continue;
+
+ if (rc != 3) {
+ printf("sscanf errored\n");
+ rc = -1;
+ break;
+ }
+
+ if (strstr(name, needle)) {
+ *low = start;
+ *high = end - 1;
+ rc = 0;
+ break;
+ }
+ }
+
+ fclose(f);
+
+ return rc;
+}
+
+static volatile sig_atomic_t took_signal = 0;
+
+static void sigusr1_handler(int sig)
+{
+ took_signal++;
+}
+
+int test_sigreturn_vdso(void)
+{
+ unsigned long low, high, size;
+ struct sigaction act;
+ char *p;
+
+ act.sa_handler = sigusr1_handler;
+ act.sa_flags = 0;
+ sigemptyset(&act.sa_mask);
+
+ assert(sigaction(SIGUSR1, &act, NULL) == 0);
+
+ // Confirm the VDSO is mapped, and work out where it is
+ assert(search_proc_maps("[vdso]", &low, &high) == 0);
+ size = high - low + 1;
+ printf("VDSO is at 0x%lx-0x%lx (%lu bytes)\n", low, high, size);
+
+ kill(getpid(), SIGUSR1);
+ assert(took_signal == 1);
+ printf("Signal delivered OK with VDSO mapped\n");
+
+ // Remap the VDSO somewhere else
+ p = mmap(NULL, size, PROT_READ|PROT_WRITE, MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
+ assert(p != MAP_FAILED);
+ assert(mremap((void *)low, size, size, MREMAP_MAYMOVE|MREMAP_FIXED, p) != MAP_FAILED);
+ assert(search_proc_maps("[vdso]", &low, &high) == 0);
+ size = high - low + 1;
+ printf("VDSO moved to 0x%lx-0x%lx (%lu bytes)\n", low, high, size);
+
+ kill(getpid(), SIGUSR1);
+ assert(took_signal == 2);
+ printf("Signal delivered OK with VDSO moved\n");
+
+ assert(munmap((void *)low, size) == 0);
+ printf("Unmapped VDSO\n");
+
+ // Confirm the VDSO is not mapped anymore
+ assert(search_proc_maps("[vdso]", &low, &high) != 0);
+
+ // Make the stack executable
+ assert(search_proc_maps("[stack]", &low, &high) == 0);
+ size = high - low + 1;
+ mprotect((void *)low, size, PROT_READ|PROT_WRITE|PROT_EXEC);
+ printf("Remapped the stack executable\n");
+
+ kill(getpid(), SIGUSR1);
+ assert(took_signal == 3);
+ printf("Signal delivered OK with VDSO unmapped\n");
+
+ return 0;
+}
+
+int main(void)
+{
+ return test_harness(test_sigreturn_vdso, "sigreturn_vdso");
+}