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List:       busybox
Subject:    Re: NOEXEC environment bug
From:       Denys Vlasenko <vda.linux () googlemail ! com>
Date:       2017-11-03 13:18:18
Message-ID: CAK1hOcMzic8MqTGWHrU97jAHHVgFj4NsA1F-iM3RhHj3s6r8tw () mail ! gmail ! com
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On Wed, Nov 1, 2017 at 8:50 PM, Ron Yorston <rmy@pobox.com> wrote:
> There's a related problem when SH_STANDALONE and SH_NOFORK are enabled:
> changed shell variables aren't visible to NOFORK applets.  For example,
>
>    $ ./busybox sh
>    $ mkdir ~/mybin
>    $ cp busybox ~/mybin/thing
>    $ export PATH=~/mybin:$PATH
>    $ which thing
>    $
>
> If SH_NOFORK is disabled (or 'which' is not NOFORK):
>
>    $ ./busybox sh
>    $ export PATH=~/mybin:$PATH
>    $ which thing
>    /home/rmy/mybin/thing
>    $
>
> Lots more applets have been made NOFORK recently, though at a quick
> glance I suspect most of them don't access environment variables.
> Obviously 'which' does.  And 'printenv'.

Indeed, it's a bug. Fixed in git, thanks!
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