Messages in this thread | | | Date | Mon, 2 Jul 2007 15:46:02 -0700 (PDT) | From | Davide Libenzi <> | Subject | Re: [patch 0/4] MAP_NOZERO v2 - VM_NOZERO/MAP_NOZERO early summer madness |
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On Mon, 2 Jul 2007, Ulrich Drepper wrote:
> On 7/2/07, Rik van Riel <riel@redhat.com> wrote: > > That should not happen. The default SELinux configuration > > in Fedora (and Debian?) runs a few daemons in their own > > restricted modes and has most of the system running in > > unconfined_t, including the majority of user programs. > > This is the state as of F7. This will change hopefully soon. > Programs like firefox run by normal users must be confined, to. Any > tests using security must be fast, it's not something which is done > only for a few apps.
The strong requirement would be that the cookie is not a bit longer than sizeof(unsigned long). For the "equality" check, this better be "==", although it could be abstracted in a function/macro that SeLinux implements in a different way. But this "equality" check is done a page-fault time, so it better be pretty quick (otherwise if they bloat that path, they probably be better of not using MAP_NOZERO at all).
- Davide
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