Re: [PATCH] PPC64 Implement non-executable stacks

[Andrew Morton]

Paul Mackerras <paulus@xxxxxxxxx> wrote:
>
>  This patch, by Jake Moilanen with some further hacking from me, adds a
>  real execute permission bit to the linux PTEs on PPC64, and connects
>  that into the kernel infrastructure for implementing non-executable
>  stacks and heaps.  This means that on any PPC64 cpu since the POWER4
>  (i.e. POWER4, PPC970, PPC970FX, POWER4+, POWER5) you will get a
>  segfault if you try to execute instructions from a region that doesn't
>  have PROT_EXEC permission.  The patch also marks the pages of the
>  linear mapping that aren't part of the kernel text as non-executable.
> 
>  Andrew and Linus, could you try this on your G5s? 

Seems to work OK under ydl 4.0.  OpenOffice hung once starting up, but that
wasn't repeatable.

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