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Date:	Fri, 28 Aug 2009 19:26:01 -0500
Message-ID:	<93c172b50908281726r2bbad086ta7d18dcccffe142@mail.gmail.com>
Subject:	Fwd: ZILE 2.3.10 (Autoconf 2.64 finds deadly DJGPP Bash bug)
From:	Rugxulo <rugxulo AT gmail DOT com>
To:	djgpp-workers AT delorie DOT com
Cc:	Charles Sandmann <cwsdpmi AT earthlink DOT net>
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Hi guys, does this help you any?


---------- Forwarded message ----------
From: Chet Ramey <chet DOT ramey AT case DOT edu>
Date: Fri, Aug 28, 2009 at 6:06 PM
Subject: Re: ZILE 2.3.10 (Autoconf 2.64 finds deadly DJGPP Bash bug)
To: Rugxulo <rugxulo AT gmail DOT com>
Cc: bug-autoconf AT gnu DOT org, chet DOT ramey AT case DOT edu


Rugxulo wrote:

> Here's Gordon's simple example to narrow down the problem:
>
> http://www.delorie.com/djgpp/mail-archives/browse.cgi?p=3Ddjgpp/2006/08/0=
8/16:37:27
>
> And here's Esa's attempt to identify why it crashes. Possibly a setjmp
> not returning. (Note that nobody has been able to fix this yet. Even
> back in 2006 both Martin and Andris tried and failed.)
>
> http://www.delorie.com/djgpp/mail-archives/browse.cgi?p=3Ddjgpp/2006/08/2=
0/11:54:36

He's probably right. =A0The post-fork child branch of command_substitute
makes no attempt to restore its environment before calling exit. =A0There
are a number of places in the code that rely on Unix/Posix fork()
semantics; this is one of them. =A0The problem will occur only on systems
like DJGPP that don't have fork and don't perfectly emulate it.

If someone wants to take another run at fixing it, there are other places
in the code that save and restore a jump_buf (or, as bash calls it,
procenv_t). =A0More modern versions of bash use a COPY_PROCENV macro,
defined in bashjmp.h; you could copy that or roll your own using
bcopy/memcpy.

Chet

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