xnu-7195.50.7.100.1.tar.gz

[apple/xnu.git] / libsyscall / wrappers / unix03 / mmap.c

diff --git a/libsyscall/wrappers/unix03/mmap.c b/libsyscall/wrappers/unix03/mmap.c
index 203301e3f8c32217c3750b4addfc78383ff29410..c2fd55f78739d48a63124d2d90b70440aa1d7eba 100644 (file)
--- a/libsyscall/wrappers/unix03/mmap.c
+++ b/libsyscall/wrappers/unix03/mmap.c
@@ -46,19 +46,21 @@ mmap(void *addr, size_t len, int prot, int flags, int fildes, off_t off)
         * Preemptory failures:
         *
         * o    off is not a multiple of the page size
+        *      [ This is enforced by the kernel with MAP_UNIX03 ]
         * o    flags does not contain either MAP_PRIVATE or MAP_SHARED
         * o    len is zero
+        *
+        * Now enforced by the kernel when the MAP_UNIX03 flag is provided.
         */
        extern void cerror_nocancel(int);
-       if ((off & PAGE_MASK) ||
-           (((flags & MAP_PRIVATE) != MAP_PRIVATE) &&
+       if ((((flags & MAP_PRIVATE) != MAP_PRIVATE) &&
            ((flags & MAP_SHARED) != MAP_SHARED)) ||
            (len == 0)) {
                cerror_nocancel(EINVAL);
                return MAP_FAILED;
        }
 
-       void *ptr = __mmap(addr, len, prot, flags, fildes, off);
+       void *ptr = __mmap(addr, len, prot, flags | MAP_UNIX03, fildes, off);
 
        if (__syscall_logger) {
                int stackLoggingFlags = stack_logging_type_vm_allocate;