Date: Tue, 30 Sep 2003 17:03:29 +1000
From: Anton Blanchard <anton@samba.org>
To: srikrish <srikrish@in.ibm.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [PATCH] For Segmentation Fault when using large external array
Message-ID: <20030930070328.GG24019@krispykreme>
References: <006601c38685$0148b3a0$9915b609@srikrishnan>
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Hi,

> When I compile and run an application with a large external array I get a
> Segmentation Fault.

...

> Comments: The problem is that we don't reserve the bss region for the app
> (via a set_brk/do_brk call) until after we've loaded the loader so they get
> mapped to overlapping memory locations. The fix is to move the update to
> current->mm.* and the set_brk/do_brk call to before the point we call
> load_elf_interp().

Yes it would be nice if we failed more gracefully here. A number of
people have come to me after hitting this problem, not realising that
its the size of their bss that caused the SEGV.

BTW I didnt look at your patch, unfortunately your mailer destroyed it.

Anton
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