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Re: Segmentation fault when -x is added and variable contains nulls


From: Andreas Schwab
Subject: Re: Segmentation fault when -x is added and variable contains nulls
Date: Thu, 06 Feb 2014 16:06:56 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3 (gnu/linux)

Greg Wooledge <address@hidden> writes:

> On Thu, Feb 06, 2014 at 11:51:25AM +0800, Dan Jacobson wrote:
>> # su - nobody
>> No directory, logging in with HOME=/
>> $ cat /tmp/r
>> LC_CTYPE=zh_TW.UTF-8 N=$(echo ??????|iconv -t big5 -f utf-8) sh -xc ': $N'
>> $ sh /tmp/r
>> /tmp/r: line 1:  4551 Segmentation fault      LC_CTYPE=zh_TW.UTF-8 N=$(echo 
>> ??????|iconv -t big5 -f utf-8) sh -xc ': $N'
>> 
>> Something about that embedded null.
>> bash, version 4.3.0(1)-rc1 (i486-pc-linux-gnu)
>
> Just for the record, a variable can't contain a NUL byte. I don't
> know what your input string is (my system can't handle this locale; I
> just see ?????? in my mail client), nor do I know what the output of
> the iconv command is for that input.  Let's speculate that (as implied
> by your Subject) there is a NUL byte somewhere in the middle of it.

BIG5 is a multi-byte encoding, it doesn't have embedded NUL bytes.

Andreas.

-- 
Andreas Schwab, SUSE Labs, address@hidden
GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE  1748 E4D4 88E3 0EEA B9D7
"And now for something completely different."



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