Bug 593329
| Summary: | Feature Request for RHEL6 kernel IMA | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 6 | Reporter: | Shailendra Bandodkar <sbandodk> |
| Component: | kernel | Assignee: | Red Hat Kernel Manager <kernel-mgr> |
| Status: | CLOSED DUPLICATE | QA Contact: | Red Hat Kernel QE team <kernel-qe> |
| Severity: | high | Docs Contact: | |
| Priority: | low | ||
| Version: | 6.0 | CC: | rchidamb, rudiyar |
| Target Milestone: | rc | Keywords: | FutureFeature |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Enhancement | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2010-08-13 15:24:32 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
*** This bug has been marked as a duplicate of bug 584901 *** |
Upcoming RHEL6 has a problem related to IMA (Integrity Management Architecture) and OpenAFS. See the following mail: Betreff: [OpenAFS-announce] OpenAFS on Red Had Enterprise Linux 6 Datum: Fri, 23 Apr 2010 15:08:13 -0400 Von: Marc Dionne <marc.c.dionne> Antwort an: openafs-info An: openafs-announce Red Hat has recently announced the availability of a beta version of its next Red Hat Enterprise Linux release (RHEL6). While OpenAFS is functional with this release, it generates a large volume of messages in the system log when used with a disk cache. Background The 2.6.32 kernel in RHEL6 enables IMA (Integrity Management Architecture). This feature uses counters to verify and require that certain operations on files be "balanced", and produces warnings in the syslog if they are not. OpenAFS uses dentry_open() to open disk cache files, and in 2.6.32 this function does not increment any IMA counters. Every caller is expected to also call ima_counts_get() to properly increment the counters and balance with the decrement that happens automatically in fput(). Unfortunately, ima_counts_get() is available only for GPL modules, which leaves non GPL modules with no way to use the dentry_open/fput combination correctly. As cache files are opened and closed repeatedly in OpenAFS, this generates a very large number of warnings in the system log. Fixes Kernel developers have acknowledged that this API is problematic, and it has been reworked in 2.6.33 and later, notably with these commits: 0552f879: Untangling ima mess, part 1: alloc_file() b65a9cfc: Untangling ima mess, part 2: deal with counters 1429b3ec: Untangling ima mess, part 3: kill dead code in ima These commits have not yet been backported to 2.6.32 and earlier stable kernels. See also https://bugzilla.redhat.com/show_bug.cgi?id=584901 Since about 15 years we're using AFS as our main shared filesystem here at the University of Cologne. It's the backbone for our Unix/Linux based server environment and about 50000 users have access to their home directories in AFS. We also use AFS to hold centrally installed software. At the moment we have about 240 systems registered in RHN. In addition to these RHEL Systems numerous other systems (various Unix/Linux,OS X, Windows) are connected to AFS througout our campus. The problem mentioned above is not a functional restriction but it renders systems unmanageable because if the 'noise' in the logs. We need to see the commits from upstream kernels backported to the RHEL6 release kernel.