Messages in this thread | | | Date | Thu, 30 Jun 2005 14:44:58 -0500 | From | serue@us ... | Subject | [patch 0/12] lsm stacking v0.2: intro |
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Hi,
The set of patches to follow introduces support for stacking LSMs. This is its second posting to lkml. I am sending it out in the hopes of soliciting feedback and testing, with the obvious eventual goal of mainline adoption.
The patches mainly do the following:
1. Introduce the stacker LSM. 2. Change the kernel object void * security fields to be hlists, and introduce an api for modules to share these. 3. Modify SELinux to make use of stacker. 4. Modify seclvl to use stacker.
Motivation:
The purpose of these patches is to enable stacking multiple security modules. There are several cases where this would be very useful. It eases the testing of new modules with distro kernels, as it makes it possible to stack new modules with selinux and capabilities -- for instance if a user is running fedora. Second, it enables running selinux (or LIDS, etc) with integrity verification modules. (Digsig is an example of these, and within a few months hopefully the TPM-enabled slim+evm modules, which verifies integrity of file contents and extended attributes such as selinux contexts (http://www.acsac.org/2004/workshop/David-Safford.pdf) will be released for mainline inclusion). Thirdly, there are systems where running selinux is not practical for footprint reasons, and the security goals are easily expressed as a very small module. For instance, it might be desirable to confine a web browser on a zaurus, or to implement a site security policy on old hardware as per http://mail.wirex.com/pipermail/linux-security-module/2005-May/6071.html
Performance impact of the actual stacker module is negligable. The security_{get,set,del,add}_value API does have a small performance impact. Please see http://marc.theaimsgroup.com/?l=linux-security-module&m=111820455332752&w=2 and http://marc.theaimsgroup.com/?l=linux-security-module&m=111824326500837&w=2 if interested in the performance results. I am certainly interested in ways to further speed up security_get_value.
thanks, -serge - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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