1 files changed, 115 insertions, 0 deletions
diff --git a/test/msan/Linux/syscalls.cc b/test/msan/Linux/syscalls.cc
new file mode 100644
index 0000000000000..4dd97e7451480
--- /dev/null
+++ b/test/msan/Linux/syscalls.cc
@@ -0,0 +1,115 @@
+// RUN: %clangxx_msan -m64 -O0 %s -o %t && %run %t 2>&1
+// RUN: %clangxx_msan -m64 -O3 %s -o %t && %run %t 2>&1
+
+#include <assert.h>
+#include <errno.h>
+#include <glob.h>
+#include <stdio.h>
+#include <string.h>
+
+#include <linux/aio_abi.h>
+#include <sys/ptrace.h>
+#include <sys/stat.h>
+#include <sys/uio.h>
+
+#include <sanitizer/linux_syscall_hooks.h>
+#include <sanitizer/msan_interface.h>
+
+/* Test the presence of __sanitizer_syscall_ in the tool runtime, and general
+   sanity of their behaviour. */
+
+int main(int argc, char *argv[]) {
+  char buf[1000];
+  const int kTen = 10;
+  const int kFortyTwo = 42;
+  memset(buf, 0, sizeof(buf));
+  __msan_unpoison(buf, sizeof(buf));
+  __sanitizer_syscall_pre_recvmsg(0, buf, 0);
+  __sanitizer_syscall_pre_rt_sigpending(buf, kTen);
+  __sanitizer_syscall_pre_getdents(0, buf, kTen);
+  __sanitizer_syscall_pre_getdents64(0, buf, kTen);
+
+  __msan_unpoison(buf, sizeof(buf));
+  __sanitizer_syscall_post_recvmsg(0, 0, buf, 0);
+  __sanitizer_syscall_post_rt_sigpending(-1, buf, kTen);
+  __sanitizer_syscall_post_getdents(0, 0, buf, kTen);
+  __sanitizer_syscall_post_getdents64(0, 0, buf, kTen);
+  assert(__msan_test_shadow(buf, sizeof(buf)) == -1);
+
+  __msan_unpoison(buf, sizeof(buf));
+  __sanitizer_syscall_post_recvmsg(kTen, 0, buf, 0);
+
+  // Tell the kernel that the output struct size is 10 bytes, verify that those
+  // bytes are unpoisoned, and the next byte is not.
+  __msan_poison(buf, kTen + 1);
+  __sanitizer_syscall_post_rt_sigpending(0, buf, kTen);
+  assert(__msan_test_shadow(buf, sizeof(buf)) == kTen);
+
+  __msan_poison(buf, kTen + 1);
+  __sanitizer_syscall_post_getdents(kTen, 0, buf, kTen);
+  assert(__msan_test_shadow(buf, sizeof(buf)) == kTen);
+
+  __msan_poison(buf, kTen + 1);
+  __sanitizer_syscall_post_getdents64(kTen, 0, buf, kTen);
+  assert(__msan_test_shadow(buf, sizeof(buf)) == kTen);
+
+  __msan_poison(buf, sizeof(buf));
+  __sanitizer_syscall_post_clock_getres(0, 0, buf);
+  assert(__msan_test_shadow(buf, sizeof(buf)) == sizeof(long) * 2);
+
+  __msan_poison(buf, sizeof(buf));
+  __sanitizer_syscall_post_clock_gettime(0, 0, buf);
+  assert(__msan_test_shadow(buf, sizeof(buf)) == sizeof(long) * 2);
+
+  // Failed syscall does not write to the buffer.
+  __msan_poison(buf, sizeof(buf));
+  __sanitizer_syscall_post_clock_gettime(-1, 0, buf);
+  assert(__msan_test_shadow(buf, sizeof(buf)) == 0);
+
+  __msan_poison(buf, sizeof(buf));
+  __sanitizer_syscall_post_read(5, 42, buf, 10);
+  assert(__msan_test_shadow(buf, sizeof(buf)) == 5);
+
+  __msan_poison(buf, sizeof(buf));
+  __sanitizer_syscall_post_newfstatat(0, 5, "/path/to/file", buf, 0);
+  assert(__msan_test_shadow(buf, sizeof(buf)) == sizeof(struct stat));
+
+  __msan_poison(buf, sizeof(buf));
+  int prio = 0;
+  __sanitizer_syscall_post_mq_timedreceive(kFortyTwo, 5, buf, sizeof(buf), &prio, 0);
+  assert(__msan_test_shadow(buf, sizeof(buf)) == kFortyTwo);
+  assert(__msan_test_shadow(&prio, sizeof(prio)) == -1);
+
+  __msan_poison(buf, sizeof(buf));
+  __sanitizer_syscall_post_ptrace(0, PTRACE_PEEKUSER, kFortyTwo, 0xABCD, buf);
+  assert(__msan_test_shadow(buf, sizeof(buf)) == sizeof(void *));
+
+  __msan_poison(buf, sizeof(buf));
+  struct iocb iocb[3];
+  struct iocb *iocbp[3] = { &iocb[0], &iocb[1], &iocb[2] };
+  memset(iocb, 0, sizeof(iocb));
+  iocb[0].aio_lio_opcode = IOCB_CMD_PREAD;
+  iocb[0].aio_buf = (__u64)buf;
+  iocb[0].aio_nbytes = 10;
+  iocb[1].aio_lio_opcode = IOCB_CMD_PREAD;
+  iocb[1].aio_buf = (__u64)(&buf[20]);
+  iocb[1].aio_nbytes = 15;
+  struct iovec vec[2] = { {&buf[40], 3}, {&buf[50], 20} };
+  iocb[2].aio_lio_opcode = IOCB_CMD_PREADV;
+  iocb[2].aio_buf = (__u64)(&vec);
+  iocb[2].aio_nbytes = 2;
+  __sanitizer_syscall_pre_io_submit(0, 3, &iocbp);
+  assert(__msan_test_shadow(buf, sizeof(buf)) == 10);
+  assert(__msan_test_shadow(buf + 20, sizeof(buf) - 20) == 15);
+  assert(__msan_test_shadow(buf + 40, sizeof(buf) - 40) == 3);
+  assert(__msan_test_shadow(buf + 50, sizeof(buf) - 50) == 20);
+
+  __msan_poison(buf, sizeof(buf));
+  char *p = buf;
+  __msan_poison(&p, sizeof(p));
+  __sanitizer_syscall_post_io_setup(0, 1, &p);
+  assert(__msan_test_shadow(&p, sizeof(p)) == -1);
+  assert(__msan_test_shadow(buf, sizeof(buf)) >= 32);
+
+  return 0;
+}