freebsd stable - Dec 2005 - Diskless /libexec/ld-elf.so.1: Cannot execute objects on /

Hi,

After upgrade from FreeBSD 5.3 to FREEBSD_5_4 (cvs), our diskless
machines didn't work correctly, many applications using dynamic
libraries didn't start, this error was showed:

/libexec/ld-elf.so.1: Cannot execute objects on /

We found on all diskless machines had MNT_NOEXEC flags set on (fstatfs).
After that we have changed rtld.c changed:

--- rtld.c.orig Thu Dec 15 17:26:41 2005
+++ rtld.c      Thu Dec 15 17:38:15 2005
@@ -1267,7 +1267,7 @@
                close(fd);
                return NULL;
            }
-           if (fs.f_flags & MNT_NOEXEC) {
+           if (fs.f_flags & MNT_NOEXEC &&
strcmp(fs.f_mntonname,"/") ) {
                _rtld_error("Cannot execute objects on %s\n",
fs.f_mntonname);
                close(fd);
                return NULL;

Now, all diskless stations works fine.

Is there another solution for this case?

Thanks,
Paulo Fragoso.

Paulo Fragoso wrote:
> Hi,
>
> After upgrade from FreeBSD 5.3 to FREEBSD_5_4 (cvs), our diskless
> machines didn't work correctly, many applications using dynamic
> libraries didn't start, this error was showed:
>
> /libexec/ld-elf.so.1: Cannot execute objects on /
>
> We found on all diskless machines had MNT_NOEXEC flags set on (fstatfs).
> After that we have changed rtld.c changed:
>
Ops, all remote mount points defined with read-only on server has 
MNT_NOEXEC flag seted on the clients (diskless), is there a bug with 
fstatfs function?

server:
/usr/X11R6 -ro -network A.B.C.D -mask 255.255.255.0

client:
A.B.C.S:/usr/X11R6 /usr/X11R6 nfs ro,tcp,nfsv3,-w=32768,-r=32768  0       0

On the cliente NFS the /usr/X11R6 has MNT_NOEXEC seted!

Paulo Fragoso.

On Fri, 16 Dec 2005, Paulo Fragoso wrote:
> After upgrade from FreeBSD 5.3 to FREEBSD_5_4 (cvs), our diskless
> machines didn't work correctly, many applications using dynamic
> libraries didn't start, this error was showed:
>
> /libexec/ld-elf.so.1: Cannot execute objects on /
>
> We found on all diskless machines had MNT_NOEXEC flags set on (fstatfs).
> After that we have changed rtld.c changed:
>
> --- rtld.c.orig Thu Dec 15 17:26:41 2005
> +++ rtld.c      Thu Dec 15 17:38:15 2005
> @@ -1267,7 +1267,7 @@
>               close(fd);
>               return NULL;
>           }
> -           if (fs.f_flags & MNT_NOEXEC) {
> +           if (fs.f_flags & MNT_NOEXEC &&
strcmp(fs.f_mntonname,"/") ) {
>               _rtld_error("Cannot execute objects on %s\n",
> fs.f_mntonname);
>               close(fd);
>               return NULL;
>
> Now, all diskless stations works fine.
>
> Is there another solution for this case?

We had the same problem with our netboot cluster, and going from 
RELENG_5_4 (5.4-RELEASE) up to RELENG_5 (5-STABLE) fixed it.



Mike Andrews  *  mandrews@bit0.com  *  http://www.bit0.com
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