I want to turn on a part of the kernel to make SELinux checking more stringent.
luto at mit.edu
Sun Jan 26 20:49:53 UTC 2014
On Sun, Jan 26, 2014 at 12:38 PM, Richard W.M. Jones <rjones at redhat.com> wrote:
> Slightly OT, but is SELinux stopping programs from executing code at
> address zero? (And how can I stop it doing that?)
> JONESFORTH, a public domain FORTH I wrote, is written in x86 assembler
> and prefers to put its threaded interpreter at address 0. This worked
> fine before, but has now stopped working, and this is reported to be
> due to SELinux.
IIRC, in new kernels, /proc/sys/vm/mmap_min_addr and MAC policy both
have to allow the mmap call. In older kernels, only one of them had
to allow it.
Maybe some day SMAP-capable machines (e.g. Haswell, I think) will
ignore these settings entirely -- I think that SMAP covers all the
cases that mmap_min_addr was meant to pretect against.
> Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
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