From 84172a2e26fd81c1c39b6301b003cc89b97ee75c Mon Sep 17 00:00:00 2001
From: Samuel Thibault <samuel.thibault@ens-lyon.org>
Date: Sun, 9 Nov 2014 22:38:22 +0100
Subject: Deal with odd kernel behavior
Some versions of gnumach actually take address as a mapping hint, and would fail
if the hint is bogus. Make sure to pass 0 for those versions.
* libstore/memobj.c (memobj_read): Make sure to set *buf to 0 before
calling vm_map.
---
libstore/memobj.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/libstore/memobj.c b/libstore/memobj.c
index 0d5c816e..cc6c7cac 100644
--- a/libstore/memobj.c
+++ b/libstore/memobj.c
@@ -133,6 +133,7 @@ memobj_read (struct store *store,
if (((size_t) addr & (vm_page_size - 1)) == 0)
{
*len = amount;
+ *buf = 0;
return vm_map (mach_task_self (), (vm_address_t *) buf, amount,
0, 1, store->port, addr << store->log2_block_size, 0,
VM_PROT_READ, VM_PROT_ALL, VM_INHERIT_NONE);
--
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