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Message-Id: <B50D4B61-4044-4844-92C4-1158E07C17C8@gmail.com>
Date: Thu, 10 Mar 2016 12:24:21 -0800
From: Bryan Hundven <bryanhundven@...il.com>
To: musl@...ts.openwall.com
Subject: Re: Memory management, how to protect some address space.
> On Mar 10, 2016, at 12:20 PM, Rich Felker <dalias@...c.org> 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 <dalias@...c.org> 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
-Bryan
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