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-rw-r--r--test/msan/Linux/fopencookie.cc65
1 files changed, 65 insertions, 0 deletions
diff --git a/test/msan/Linux/fopencookie.cc b/test/msan/Linux/fopencookie.cc
new file mode 100644
index 000000000000..e5b8f936e0d2
--- /dev/null
+++ b/test/msan/Linux/fopencookie.cc
@@ -0,0 +1,65 @@
+// Test fopencookie interceptor.
+// RUN: %clangxx_msan -std=c++11 -O0 %s -o %t && %run %t
+// RUN: %clangxx_msan -std=c++11 -fsanitize-memory-track-origins -O0 %s -o %t && %run %t
+
+#include <assert.h>
+#include <pthread.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <sanitizer/msan_interface.h>
+
+constexpr uintptr_t kMagicCookie = 0x12345678;
+
+static ssize_t cookie_read(void *cookie, char *buf, size_t size) {
+ assert((uintptr_t)cookie == kMagicCookie);
+ memset(buf, 0, size);
+ return 0;
+}
+
+static ssize_t cookie_write(void *cookie, const char *buf, size_t size) {
+ assert((uintptr_t)cookie == kMagicCookie);
+ __msan_check_mem_is_initialized(buf, size);
+ return 0;
+}
+
+static int cookie_seek(void *cookie, off64_t *offset, int whence) {
+ assert((uintptr_t)cookie == kMagicCookie);
+ __msan_check_mem_is_initialized(offset, sizeof(*offset));
+ return 0;
+}
+
+static int cookie_close(void *cookie) {
+ assert((uintptr_t)cookie == kMagicCookie);
+ return 0;
+}
+
+void PoisonStack() { char a[8192]; }
+
+void TestPoisonStack() {
+ // Verify that PoisonStack has poisoned the stack - otherwise this test is not
+ // testing anything.
+ char a;
+ assert(__msan_test_shadow(&a - 1000, 1) == 0);
+}
+
+int main() {
+ void *cookie = (void *)kMagicCookie;
+ FILE *f = fopencookie(cookie, "rw",
+ {cookie_read, cookie_write, cookie_seek, cookie_close});
+ PoisonStack();
+ TestPoisonStack();
+ fseek(f, 100, SEEK_SET);
+ char buf[50];
+ fread(buf, 50, 1, f);
+ fwrite(buf, 50, 1, f);
+ fclose(f);
+
+ f = fopencookie(cookie, "rw", {nullptr, nullptr, nullptr, nullptr});
+ fseek(f, 100, SEEK_SET);
+ fread(buf, 50, 1, f);
+ fwrite(buf, 50, 1, f);
+ fclose(f);
+}