diff --git a/src/tests/vm/mmap-overlap.c b/src/tests/vm/mmap-overlap.c new file mode 100644 index 0000000000000000000000000000000000000000..668ae5f0f69fe163c6157c2c46d60f76749cd3bf --- /dev/null +++ b/src/tests/vm/mmap-overlap.c @@ -0,0 +1,20 @@ +/* Verifies that overlapping memory mappings are disallowed. */ + +#include <syscall.h> +#include "tests/vm/sample.inc" +#include "tests/lib.h" +#include "tests/main.h" + +void +test_main (void) +{ + char *start = (char *) 0x10000000; + int fd[2]; + + CHECK ((fd[0] = open ("zeros")) > 1, "open \"zeros\" once"); + CHECK (mmap (fd[0], start) != MAP_FAILED, "mmap \"zeros\""); + CHECK ((fd[1] = open ("zeros")) > 1 && fd[0] != fd[1], + "open \"zeros\" again"); + CHECK (mmap (fd[1], start + 4096) == MAP_FAILED, + "try to mmap \"zeros\" again"); +}