1 files changed, 40 insertions, 0 deletions
diff --git a/test/msan/Linux/syscalls_sigaction.cc b/test/msan/Linux/syscalls_sigaction.cc
new file mode 100644
index 000000000000..1297fae13d12
--- /dev/null
+++ b/test/msan/Linux/syscalls_sigaction.cc
@@ -0,0 +1,40 @@
+// RUN: %clangxx_msan -DPRE1 -O0 %s -o %t && not %run %t 2>&1
+// RUN: %clangxx_msan -DPRE2 -O0 %s -o %t && not %run %t 2>&1
+// RUN: %clangxx_msan -DPRE3 -O0 %s -o %t && not %run %t 2>&1
+// RUN: %clangxx_msan -O0 %s -o %t && %run %t 2>&1
+
+#include <assert.h>
+#include <signal.h>
+#include <string.h>
+
+#include <sanitizer/linux_syscall_hooks.h>
+#include <sanitizer/msan_interface.h>
+
+struct my_kernel_sigaction {
+  long handler, flags, restorer;
+  uint64_t mask[20]; // larger than any known platform
+};
+
+int main() {
+  my_kernel_sigaction act = {}, oldact = {};
+
+#if defined(PRE1)
+  __msan_poison(&act.handler, sizeof(act.handler));
+  __sanitizer_syscall_pre_rt_sigaction(SIGUSR1, &act, &oldact, 20 * 8);
+#elif defined(PRE2)
+  __msan_poison(&act.flags, sizeof(act.flags));
+  __sanitizer_syscall_pre_rt_sigaction(SIGUSR1, &act, &oldact, 20 * 8);
+#elif defined(PRE3)
+  __msan_poison(&act.mask, 1);
+  __sanitizer_syscall_pre_rt_sigaction(SIGUSR1, &act, &oldact, 20 * 8);
+#else
+  // Uninit past the end of the mask is ignored.
+  __msan_poison(((char *)&act.mask) + 5, 1);
+  __sanitizer_syscall_pre_rt_sigaction(SIGUSR1, &act, &oldact, 5);
+
+  memset(&act, 0, sizeof(act));
+  __msan_poison(&oldact, sizeof(oldact));
+  __sanitizer_syscall_post_rt_sigaction(0, SIGUSR1, &act, &oldact, 5);
+  assert(__msan_test_shadow(&oldact, sizeof(oldact)) == sizeof(long)*3 + 5);
+#endif
+}