From mboxrd@z Thu Jan  1 00:00:00 1970
From: mudongliangabcd@gmail.com (mudongliang)
Date: Fri, 09 Oct 2015 15:21:10 +0800
Subject: efficient way to verify one memory block is only readable?
Message-ID: <56176AE6.30002@gmail.com>
To: kernelnewbies@lists.kernelnewbies.org
List-Id: kernelnewbies.lists.kernelnewbies.org

When I did some experiments about vtable, and modified the virtual 
method address myself,
I found error report : "Segment fault". When I see the /proc/self/maps, 
vtable is in the readonly text segment.
I almost forget the fact that vtables have been stored in readonly segment.

So I have a question : how to effectively verify one memory block is 
only readable or writable?
I think it's not efficient to check all the parts in /proc/maps.
Does anyone have another efficient way to do this verification?

Thanks in advance.
     - mudongliang