Messages in this thread | | | Subject | Re: make PROT_WRITE imply PROT_READ | From | Arjan van de Ven <> | Date | Fri, 30 Jun 2006 10:35:45 +0200 |
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On Thu, 2006-06-29 at 20:48 -0700, Ulrich Drepper wrote: > On 6/29/06, Arjan van de Ven <arjan@infradead.org> wrote: > > the thing is.. you can say EXACTLY the same about PROT_EXEC.. not all > > processors support enforcing that.. so should we just always imply > > PROT_EXEC as well? > > There is a fundamental difference: not setting PROT_EXEC has no > negative side effects. You might be able to execute code and it just > works. > > With PROT_READ this is not the case, there _are_ side effects which are visible.
there are side effects which are visible with PROT_EXEC too, and even the same kind...
with PROT_READ you may read even if you didn't specify it with PROT_EXEC you may execute even if you didn't specifiy it
apps like JVM's forgot PROT_EXEC and break when the hardware enforces it apps that forget PROT_READ break when the kernel/hardware enforce it
not too much difference....
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