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Re: unset IFS and ${v=$*} CTLNUL leakage


From: Chet Ramey
Subject: Re: unset IFS and ${v=$*} CTLNUL leakage
Date: Wed, 13 Mar 2019 07:39:30 -0400
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.5.3

On 3/8/19 6:09 PM, Grisha Levit wrote:
> A few more that produce \177 in the output, though I'm not sure if
> these have defined output:
> 
>     $ IFS=$' \t\n'   # or any other IFS
>     $ set -- ''
>     $ recho ${v= "$*" }
>     <$'\177'>
> 
>     $ IFS=''
>     $ set -- '' ''
>     $ recho ${v= "$*" }
>     <$' \177 '>

These were changed last week in the 20190306 update.

> And also variations like the below all have \177 as well, but these
> I'm pretty sure are undefined:

These are all undefined, but there's nothing wrong with doing something
more reasonable than leaving the quoted nulls in there.

Chet

-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    address@hidden    http://tiswww.cwru.edu/~chet/



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