bsd-user/mmap.c: Always zero MAP_ANONYMOUS memory in mmap_frag()

[mirror_qemu.git] / bsd-user / mmap.c

diff --git a/bsd-user/mmap.c b/bsd-user/mmap.c
index b40ab9045fe404db95f1ceb0658172d8ba9c52c4..fc3c1480f59c46c04e3b8eb2db68fc86b5b08ea8 100644 (file)
--- a/bsd-user/mmap.c
+++ b/bsd-user/mmap.c
@@ -180,10 +180,12 @@ static int mmap_frag(abi_ulong real_start,
         if (prot_new != (prot1 | PROT_WRITE))
             mprotect(host_start, qemu_host_page_size, prot_new);
     } else {
-        /* just update the protection */
         if (prot_new != prot1) {
             mprotect(host_start, qemu_host_page_size, prot_new);
         }
+        if (prot_new & PROT_WRITE) {
+            memset(g2h_untagged(start), 0, end - start);
+        }
     }
     return 0;
 }