sysvipc: Return EINVAL for invalid msgctl commands

It avoids regressions on possible future commands that might require
additional libc support.  The downside is new commands added by newer
kernels will need further glibc support.

Checked on x86_64-linux-gnu and i686-linux-gnu (Linux v4.15 and v5.4).

2 files changed, 30 insertions, 0 deletions

diff --git a/sysvipc/test-sysvipc.h b/sysvipc/test-sysvipc.h
index d7ed496511..21ef6c6565 100644
--- a/sysvipc/test-sysvipc.h
+++ b/sysvipc/test-sysvipc.h
@@ -82,4 +82,29 @@ first_sem_invalid_cmd (void)
   return invalid;
 }
 
+/* Return the first invalid command SysV IPC command for message queue.  */
+static inline int
+first_msg_invalid_cmd (void)
+{
+  const int msg_cmds[] = {
+    MSG_STAT,
+    MSG_INFO,
+#ifdef MSG_STAT_ANY
+    MSG_STAT_ANY,
+#endif
+  };
+
+  int invalid = first_common_invalid_cmd ();
+  for (int i = 0; i < array_length (msg_cmds); i++)
+    {
+      if (invalid == msg_cmds[i])
+	{
+	  invalid++;
+	  i = 0;
+	}
+    }
+
+  return invalid;
+}
+
 #endif /* _TEST_SYSV_H  */
diff --git a/sysvipc/test-sysvmsg.c b/sysvipc/test-sysvmsg.c
index 84efdade5e..ada2881065 100644
--- a/sysvipc/test-sysvmsg.c
+++ b/sysvipc/test-sysvmsg.c
@@ -24,6 +24,8 @@
 #include <sys/ipc.h>
 #include <sys/msg.h>
 
+#include <test-sysvipc.h>
+
 #include <support/support.h>
 #include <support/check.h>
 #include <support/temp_file.h>
@@ -86,6 +88,9 @@ do_test (void)
       FAIL_EXIT1 ("msgget failed (errno=%d)", errno);
     }
 
+  TEST_COMPARE (msgctl (msqid, first_msg_invalid_cmd (), NULL), -1);
+  TEST_COMPARE (errno, EINVAL);
+
   /* Get message queue kernel information and do some sanity checks.  */
   struct msqid_ds msginfo;
   if (msgctl (msqid, IPC_STAT, &msginfo) == -1)