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

[Miroslav Lachman]

Garrett Cooper wrote:
> 2010/4/20 Miroslav Lachman<000.fbsd at quip.cz>:
>> I have large storage partition (/vol0) mounted as noexec and nosuid. Then
>> one directory from this partition is mounted by nullfs as "exec and suid" so
>> anything on it can be executed.
>>
>> The directory contains full installation of jail. Jail is running fine, but
>> some ports (PHP for example) cannot be compiled inside the jail with
>> message:
>>
>> /libexec/ld-elf.so.1: Cannot execute objects on /
>>
>> The same apply to executing of apxs
>>
>> root at rainnew ~/# /usr/local/sbin/apxs -q MPM_NAME
>> /libexec/ld-elf.so.1: Cannot execute objects on /
>>
>> apxs:Error: Sorry, no shared object support for Apache.
>> apxs:Error: available under your platform. Make sure.
>> apxs:Error: the Apache module mod_so is compiled into.
>> apxs:Error: your server binary '/usr/local/sbin/httpd'..
>>
>> (it should return "prefork")
>>
>> So I think there is some bug in checking the mountpoint options, where the
>> check is made on "parent" of the nullfs instead of the nullfs target
>> mountpoint.
>>
>> It is on 6.4-RELEASE i386 GENERIC. I did not test it on another release.
>>
>> This is list of related mount points:
>>
>> /dev/mirror/gm0s2d on /vol0 (ufs, local, noexec, nosuid, soft-updates)
>> /vol0/jail/.nullfs/rain on /vol0/jail/rain_new (nullfs, local)
>> /usr/ports on /vol0/jail/rain_new/usr/ports (nullfs, local)
>> devfs on /vol0/jail/rain_new/dev (devfs, local)
>>
>> If I changed /vol0 options to (ufs, local, soft-updates) the above error is
>> gone and apxs / compilation works fine.
>>
>> Can somebody look at this problem?
>
>      Can you please provide output from ktrace / truss for the issue?

I did
# ktrace /usr/local/sbin/apxs -q MPM_NAME

The output is here http://freebsd.quip.cz/ld-elf/ktrace.out

Let me know if you need something else.

Thank you for your interest!

Miroslav Lachman