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Re: Fwd: Non-upstream patches for bash (2014)

From: Chet Ramey
Subject: Re: Fwd: Non-upstream patches for bash (2014)
Date: Sun, 25 Jun 2017 12:23:57 -0400
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:52.0) Gecko/20100101 Thunderbird/52.1.1

On 6/24/17 1:41 PM, Eduardo A. Bustamante López wrote:
> I was looking through this old thread:
> http://seclists.org/oss-sec/2014/q3/851
> It looks like the issue reported in there is still there:
>   address@hidden:~$ LANG=zh_CN.GBK printf 'echo \u4e57\n' |LANG=zh_CN.GBK bash
>   �\
>   address@hidden:~$ LANG=en_US.UTF8 printf 'echo \u4e57\n' |LANG=en_US.UTF8 
> bash

This shows that if it's a valid character in the current locale, bash will
convert it and read it back.  `printf' takes the unicode encoding (in this
case, a three-byte character) and runs it through iconv to try and convert
it to a valid multibyte character in the current locale.

>   address@hidden:~$ LANG=zh_CN.GBK printf '\u4e57' | od -tx1 -An
>    81 5c
> It looks like it doesn't detect that \x81\x5c is a single character, and
> instead treats the multibyte character as separate characters.

It's apparently not a single character in that locale.

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

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