Re: [RFC] stack and heap are executable on x86_64

From: H. Peter Anvin
Date: Thu Dec 20 2012 - 22:39:53 EST


Kees Cook <keescook@xxxxxxxxxxxx> wrote:

>On Thu, Dec 20, 2012 at 7:00 PM, Kees Cook <keescook@xxxxxxxxxxxx>
>> While trying to fix test_nx, I discovered that it looks like stack
>> heap are executable again (at least on x86_64). :( I tried to bisect
>Btw, this ends up looking like this on v3.4:
>[ 2.486223] test_nx: Testing NX protection ...
>[ 2.487468] test_nx: calling ffff88001dd57e45 (0xC3)
>[ 2.488766] test_nx: stack is executable
>[ 2.489802] test_nx: calling ffff88001e2c7580 (0xC3)
>[ 2.491106] test_nx: heap is executable
>[ 2.492086] test_nx: calling ffffffff81803c80 (0xC3)
>[ 2.493201] test_nx: calling ffffffffa0002220 (0xC3)
>[ 2.493843] test_nx: calling ffffffffa0001224 (0xC3)
>[ 2.494549] test_nx: Done testing.
>Kees Cook
>Chrome OS Security

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