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[PATCH 2/2] tests/tcg/multiarch: Add munmap-pthread.c
From: |
Ilya Leoshkevich |
Subject: |
[PATCH 2/2] tests/tcg/multiarch: Add munmap-pthread.c |
Date: |
Fri, 28 Oct 2022 14:42:27 +0200 |
Add a test to detect races between munmap() and creating new threads.
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
---
tests/tcg/multiarch/Makefile.target | 3 ++
tests/tcg/multiarch/munmap-pthread.c | 71 ++++++++++++++++++++++++++++
2 files changed, 74 insertions(+)
create mode 100644 tests/tcg/multiarch/munmap-pthread.c
diff --git a/tests/tcg/multiarch/Makefile.target
b/tests/tcg/multiarch/Makefile.target
index 78104f9bbb7..5f0fee1aadb 100644
--- a/tests/tcg/multiarch/Makefile.target
+++ b/tests/tcg/multiarch/Makefile.target
@@ -36,6 +36,9 @@ threadcount: LDFLAGS+=-lpthread
signals: LDFLAGS+=-lrt -lpthread
+munmap-pthread: CFLAGS+=-pthread
+munmap-pthread: LDFLAGS+=-pthread
+
# We define the runner for test-mmap after the individual
# architectures have defined their supported pages sizes. If no
# additional page sizes are defined we only run the default test.
diff --git a/tests/tcg/multiarch/munmap-pthread.c
b/tests/tcg/multiarch/munmap-pthread.c
new file mode 100644
index 00000000000..d2ac9aae604
--- /dev/null
+++ b/tests/tcg/multiarch/munmap-pthread.c
@@ -0,0 +1,71 @@
+/* Test that munmap() and thread creation do not race. */
+#include <assert.h>
+#include <pthread.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/mman.h>
+#include <unistd.h>
+
+static const char nop_func[] = {
+#if defined(__s390__)
+ /* br %r14 */
+ 0x07, 0xfe,
+#elif defined(__i386__) || defined(__x86_64__)
+ /* ret */
+ 0xc3,
+#endif
+};
+
+static void *thread_mmap_munmap(void *arg)
+{
+ volatile bool *run = arg;
+ char *p;
+ int ret;
+
+ while (*run) {
+ p = mmap(NULL, getpagesize(), PROT_READ | PROT_WRITE | PROT_EXEC,
+ MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+ assert(p != MAP_FAILED);
+ if (sizeof(nop_func) != 0) {
+ /*
+ * Create a small translation block if we have a template for the
+ * current architecture.
+ */
+ memcpy(p, nop_func, sizeof(nop_func));
+ ((void(*)(void))p)();
+ }
+ ret = munmap(p, getpagesize());
+ assert(ret == 0);
+ }
+
+ return NULL;
+}
+
+static void *thread_dummy(void *arg)
+{
+ return NULL;
+}
+
+int main(void)
+{
+ pthread_t mmap_munmap, dummy;
+ volatile bool run = true;
+ int i, ret;
+
+ ret = pthread_create(&mmap_munmap, NULL, thread_mmap_munmap, (void *)&run);
+ assert(ret == 0);
+
+ for (i = 0; i < 1000; i++) {
+ ret = pthread_create(&dummy, NULL, thread_dummy, NULL);
+ assert(ret == 0);
+ ret = pthread_join(dummy, NULL);
+ assert(ret == 0);
+ }
+
+ run = false;
+ ret = pthread_join(mmap_munmap, NULL);
+ assert(ret == 0);
+
+ return EXIT_SUCCESS;
+}
--
2.37.2