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[PATCH] Fix dynamic linker startup on the Hurd

From: Richard Braun
Subject: [PATCH] Fix dynamic linker startup on the Hurd
Date: Wed, 23 Jan 2013 00:32:47 +0100

The fmh function could in some cases mistakenly call vm_map with a null
size. A recent kernel fix made that invalid and return KERN_INVALID_ARGUMENT,
which isn't an expected code here, resulting in the linker not starting.
Avoid calling vm_map when the computed mapping size is null to fix the

* sysdeps/mach/hurd/dl-sysdep.c (fmh): Leave loop when the computed mapping
size fmhs becomes null.
 sysdeps/mach/hurd/dl-sysdep.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/sysdeps/mach/hurd/dl-sysdep.c b/sysdeps/mach/hurd/dl-sysdep.c
index 67391d4..83f5bac 100644
--- a/sysdeps/mach/hurd/dl-sysdep.c
+++ b/sysdeps/mach/hurd/dl-sysdep.c
@@ -111,6 +111,8 @@ static void fmh(void) {
       while (1) {
+       if (fmhs == 0)
+         break;
        err = __vm_map (__mach_task_self (),
                        &fmha, fmhs, 0, 0, MACH_PORT_NULL, 0, 1,
                        VM_PROT_NONE, VM_PROT_NONE, VM_INHERIT_COPY);

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