Re: Bash-4.3 Official Patch 27

[Nathan McGarvey]

Does anyone know if Red Hat intends on remerging with official bash? (This
may be better directed at a seperate thread with them.)

-Nathan
On Sep 28, 2014 12:49 AM, "Eric Blake" <address@hidden> wrote:

> On 09/27/2014 08:50 PM, Chet Ramey wrote:
> >                            BASH PATCH REPORT
> >                            =================
>
> >         /* Don't import function names that are invalid identifiers from
> the
> >            environment, though we still allow them to be defined as shell
> >            variables. */
> > !       if (absolute_program (tname) == 0 && (posixly_correct == 0 ||
> legal_identifier (tname)))
> > !         parse_and_execute (temp_string, tname,
> SEVAL_NONINT|SEVAL_NOHIST|SEVAL_FUNCDEF|SEVAL_ONECMD);
>
> This patch forbids importing function names containing '/' (yay!), and
> we already established that bash has never been able to properly import
> functions with names containing '='.  But I'm assuming there will need
> to be a followup patch to actually reject the attempt to create such
> function names (that is, "bash -c 'a/b () { echo oops; }; a/b'" should
> issue an error message instead of printing "oops"), so that we do not
> have the confusing situation of being unable to pass all permitted
> function names through an export/import cycle.
>
> By the way, thanks for this patch - it plugs CVE-2014-7186,
> CVE-2014-7187, and CVE-2014-6277 (and probably other parser crashes)
> from remote exploits down to merely annoying local bugs that can no
> longer be abused for privilege escalation.  In other words, it is THIS
> patch that plugs the Shell Shock issue, even though there are still more
> patches needed to plug all of the parser holes that Shell Shock has
> uncovered.
>
> --
> Eric Blake   eblake redhat com    +1-919-301-3266
> Libvirt virtualization library http://libvirt.org
>
>