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Re: Race condition in read -t


From: Chet Ramey
Subject: Re: Race condition in read -t
Date: Mon, 31 Aug 2015 09:25:33 -0400
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:38.0) Gecko/20100101 Thunderbird/38.2.0

On 8/28/15 7:52 PM, Oleg Popov wrote:

> Description:
>       Function reset_alarm() in read.def first resets SIGALRM handler and
>       then cancels alarm. Sometimes, SIGALRM comes between those 2 calls and
>       crashes (sub)shell.
> 
> Repeat-By:
>       while sleep 0.00$RANDOM; do echo test; done | while true; do read -t 
> 0.00$RANDOM; echo $REPLY; done
>       (usually takes a few seconds to crash, sometimes minutes)
> 
> Fix:
>       Swap the lines in reset_alarm().

Thanks for the report.  This will be fixed in the next release of bash.

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



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