diff --git a/src/tests/vm/mmap-zero.c b/src/tests/vm/mmap-zero.c new file mode 100644 index 0000000000000000000000000000000000000000..368b759d48e0d989253a145de2c55c3f7b6ad066 --- /dev/null +++ b/src/tests/vm/mmap-zero.c @@ -0,0 +1,27 @@ +/* Tries to map a zero-length file, which may or may not work but + should not terminate the process or crash. + Then dereferences the address that we tried to map, + and the process must be terminated with -1 exit code. */ + +#include <syscall.h> +#include "tests/lib.h" +#include "tests/main.h" + +void +test_main (void) +{ + char *data = (char *) 0x7f000000; + int handle; + + CHECK (create ("empty", 0), "create empty file \"empty\""); + CHECK ((handle = open ("empty")) > 1, "open \"empty\""); + + /* Calling mmap() might succeed or fail. We don't care. */ + msg ("mmap \"empty\""); + mmap (handle, data); + + /* Regardless of whether the call worked, *data should cause + the process to be terminated. */ + fail ("unmapped memory is readable (%d)", *data); +} +