[compiler-rt][rtsan] process_vm_readv/process_vm_writev interception.

Author: devnexen

compiler-rt/lib/rtsan/rtsan_interceptors_posix.cpp

@@ -933,7 +933,7 @@ INTERCEPTOR(int, recvmmsg, int socket, struct mmsghdr *message,
 #else
 INTERCEPTOR(int, recvmmsg, int socket, struct mmsghdr *message,
             unsigned int len, int flags, struct timespec *timeout) {
-#endif
+#endif // defined(__GLIBC_MINOR) && __GLIBC_MINOR__ < 21
   __rtsan_notify_intercepted_call("recvmmsg");
   return REAL(recvmmsg)(socket, message, len, flags, timeout);
 }
@@ -1098,6 +1098,30 @@ INTERCEPTOR(int, execve, const char *filename, char *const argv[],
   return REAL(execve)(filename, argv, envp);
 }
 
+#if SANITIZER_INTERCEPT_PROCESS_VM_READV
+INTERCEPTOR(ssize_t, process_vm_readv, const struct iovec *local_iov,
+            unsigned long liovcnt, const struct iovec *remote_iov,
+            unsigned long riovcnt, unsigned long flags) {
+  __rtsan_notify_intercepted_call("process_vm_readv");
+  return REAL(process_vm_readv)(local_iov, liovcnt, remote_iov, riovcnt, flags);
+}
+
+INTERCEPTOR(ssize_t, process_vm_writev, const struct iovec *local_iov,
+            unsigned long liovcnt, const struct iovec *remote_iov,
+            unsigned long riovcnt, unsigned long flags) {
+  __rtsan_notify_intercepted_call("process_vm_writev");
+  return REAL(process_vm_writev)(local_iov, liovcnt, remote_iov, riovcnt,
+                                 flags);
+}
+#define RTSAN_MAYBE_INTERCEPT_PROCESS_VM_READV                                 \
+  INTERCEPT_FUNCTION(process_vm_readv)
+#define RTSAN_MAYBE_INTERCEPT_PROCESS_VM_WRITEV                                \
+  INTERCEPT_FUNCTION(process_vm_writev)
+#else
+#define RTSAN_MAYBE_INTERCEPT_PROCESS_VM_READV
+#define RTSAN_MAYBE_INTERCEPT_PROCESS_VM_WRITEV
+#endif
+
 // TODO: the `wait` family of functions is an oddity. In testing, if you
 // intercept them, Darwin seemingly ignores them, and linux never returns from
 // the test. Revisit this in the future, but hopefully intercepting fork/exec is
@@ -1277,6 +1301,9 @@ void __rtsan::InitializeInterceptors() {
   INTERCEPT_FUNCTION(fork);
   INTERCEPT_FUNCTION(execve);
 
+  RTSAN_MAYBE_INTERCEPT_PROCESS_VM_READV;
+  RTSAN_MAYBE_INTERCEPT_PROCESS_VM_WRITEV;
+
   INTERCEPT_FUNCTION(syscall);
 }
 

compiler-rt/lib/rtsan/tests/rtsan_test_interceptors_posix.cpp

@@ -657,6 +657,28 @@ TEST(TestRtsanInterceptors, UmaskDiesWhenRealtime) {
   ExpectNonRealtimeSurvival(Func);
 }
 
+#if SANITIZER_INTERCEPT_PROCESS_VM_READV
+TEST(TestRtsanInterceptors, ProcessVmReadvDiesWhenRealtime) {
+  char stack[1024];
+  int p;
+  iovec lcl{&stack, sizeof(stack)};
+  iovec rmt{&p, sizeof(p)};
+  auto Func = [&lcl, &rmt]() { process_vm_readv(0, &lcl, 1, &rmt, 1, 0); };
+  ExpectRealtimeDeath(Func, "process_vm_readv");
+  ExpectNonRealtimeSurvival(Func);
+}
+
+TEST(TestRtsanInterceptors, ProcessVmWritevDiesWhenRealtime) {
+  char stack[1024];
+  int p;
+  iovec lcl{&p, sizeof(p)};
+  iovec rmt{&stack, sizeof(stack)};
+  auto Func = [&lcl, &rmt]() { process_vm_writev(0, &lcl, 1, &rmt, 1, 0); };
+  ExpectRealtimeDeath(Func, "process_vm_writev");
+  ExpectNonRealtimeSurvival(Func);
+}
+#endif
+
 class RtsanDirectoryTest : public ::testing::Test {
 protected:
   void SetUp() override {