how does execstack work?
sds at tycho.nsa.gov
Tue Mar 17 17:28:57 UTC 2009
On Tue, 2009-03-17 at 17:49 +0100, Sebastian Pfaff wrote:
> Does SELinux prevent exectution on the stack? If yes, how can i see
> this. It would also be helpful, when i had an example which shows me a
> denial of execstack (searching the log gave no results here). Or is
> something wrong with my example?
> I suppose, i have an wrong understanding adout how SELinux execstack
> works. Please help to clarify this.
The SELinux execstack check only comes into play if the process calls
mprotect(...PROT_EXEC...) on the stack. It is just a policy control
over the ability of the process to mark its stack executable. If the
program was marked as requiring an executable stack, then that won't
ever happen - the kernel will set it up accordingly from the beginning.
National Security Agency
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