Date: Thu, 10 Mar 2016 15:20:50 -0500 From: Rich Felker <dalias@...c.org> To: musl@...ts.openwall.com Subject: Re: Memory management, how to protect some address space. 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
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