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Date: Thu, 10 Mar 2016 12:24:21 -0800
From: Bryan Hundven <>
Subject: Re: Memory management, how to protect some address space.

> On Mar 10, 2016, at 12:20 PM, Rich Felker <> wrote:
> On Thu, Mar 10, 2016 at 09:23:02PM +0200, John Found wrote:
>> On Thu, 10 Mar 2016 14:11:03 -0500
>> Rich Felker <> wrote:
>>> The proper way to use personality() is before exec'ing your program.
>>> The stack address and some spare memory that musl re-uses as heap get
>>> assigned at exec time before you can do anything within your program
>>> to prevent that from happening. In theory that could happen with glibc
>>> too; if it doesn't you're just getting lucky.
>>> Rich
>> Hm, isn't it paragraph 22? sys_personality changes the personality
>> of the calling process.
>> How to call it *before* executing program???
> exec does not make a new process; it replaces the program running in
> the current process with a new one. There's actually a command line
> too (I forget the name) to run a program with a particular personality
> that calls personality() before execve().
> Rich

iirc: setarch


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