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Re: mprotect(PROT_NONE) doesn't prevent reading/writing on 2.6.14 Au1550

To: Clem Taylor <clem.taylor@gmail.com>
Subject: Re: mprotect(PROT_NONE) doesn't prevent reading/writing on 2.6.14 Au1550
From: Pete Popov <ppopov@embeddedalley.com>
Date: Mon, 12 Dec 2005 20:52:36 -0800
Cc: "'linux-mips@linux-mips.org'" <linux-mips@linux-mips.org>
In-reply-to: <ecb4efd10512121334g6713d30ftf5a351fc61f1b6bd@mail.gmail.com>
Organization: Embedded Alley Solutions, Inc
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <ecb4efd10512121334g6713d30ftf5a351fc61f1b6bd@mail.gmail.com>
Reply-to: ppopov@embeddedalley.com
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On Mon, 2005-12-12 at 16:34 -0500, Clem Taylor wrote:
> Hi,
> 
> It seems that mprotect(PROT_NONE) isn't actually doing anything on my
> 2.6.14 au1550 system.
> 
> Attached is a simple test that allocates 64K (64K aligned),
> reads/writes the buffer, mprotect(PROT_NONE) the buffer and then
> attempts to read and write to the buffer a second time. I expected
> that writing to a PROT_NONE page would result in a segfault, but on
> the Au1550 the program runs without faulting. Running the same code on
> x86 (2.6.13) segfaults as expected.
> 
> Is there some reason why mprotect() wouldn't work on the Au1550, or is
> this a bug?

Do you have another MIPS system you can test this on?

Pete


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