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Date: Sun, 28 Jul 2013 20:10:26 -0400
From: Charles Wilson <cygwin AT cwilson DOT fastmail DOT fm>
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To: cygwin AT cygwin DOT com
Subject: Re: setup-x86_64: postinstall errors: Package bash 1, Package a2ps 2 and xinit 134
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On 7/28/2013 5:47 PM, Jon TURNEY wrote:
> On 25/07/2013 05:24, Kenneth Wolcott wrote:
>>    I downloaded a fresh setup-x86_64.exe from cygwin.com and then ran
>> the update again.
>>
>>    Now I get only this postinstall error:
>>
>>    Package: xinit
>>      xinit.sh exit code 134
> I can reproduce this problem, so I had a go at investigating and fixing it.
>
> mkshortcut appears to exiting with SIGABRT in free(), which suggests some heap
> corruption, which I managed to track down after a bit of work with dmalloc.
>
> This appears to be a long standing bug, which for some reason manifests itself
> more severely on x86_64.
>
> xstrncat() does not allow for the terminating null byte in the memory
> allocation it makes.  strncat(dest, src, n) writes n+1 bytes to dest (n from
> src plus the terminating null byte, which is always appended).  So, the size
> of dest must be at least strlen(dest)+n+1.  Currently only strlen(dest)+n
> bytes are allocated.
>
> Trivial patch attached.

Thanks, Jon. I'll roll a new release of cygutils immediately for both 
x86 and x86_64.

--
Chuck



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