From: Mikaël Urankar <mikael.urankar@gmail.com>
Date: Sat, 8 Jul 2017 11:13:31 +0000 (+0200)
Subject: bsd-user/mmap.c: Always zero MAP_ANONYMOUS memory in mmap_frag()
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=948516a3fac0bdd47eb127fe1a86148ed86d5c65;p=qemu.git

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

Similar to the equivalent linux-user commit e6deac9cf99

When mapping MAP_ANONYMOUS memory fragments, still need notice about to
set it zero, or it will cause issues.

Signed-off-by: Mikaël Urankar <mikael.urankar@gmail.com>
Signed-off-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Kyle Evans <kevans@FreeBSD.org>
---

diff --git a/bsd-user/mmap.c b/bsd-user/mmap.c
index b40ab9045f..fc3c1480f5 100644
--- 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;
 }