Bug 4545
| Summary: | rpc.mountd denial of service | ||
|---|---|---|---|
| Product: | [Retired] Red Hat Linux | Reporter: | ncb |
| Component: | nfs-server | Assignee: | David Lawrence <dkl> |
| Status: | CLOSED CURRENTRELEASE | QA Contact: | |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | 5.2 | Keywords: | Security |
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | i386 | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 1999-08-26 22:57:33 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: | |||
Sorry, forgot to mention this isn't a problem with knfsd in 6.0. Fixed in nfs-server-2.2beta44-2. Thanks for the patch. |
nfs-server-2.2beta44 on Redhat 5.2, with kernel 2.2.9. My /etc/exports looks like this: /hj4 @all-cc(rw) We've got some hosts that are not in the all-cc netgroup, and should be denied access to /hj4. rpc.mountd does deny the mount to these systems, but suffers a SIGSEGV in the process. After inspecting auth.c:auth_unknown_clientbyaddr() this behavior seems not to be strictly a YP problem, but rather any unauthorized host requesting services from mountd. Here is a (quite simple) patch: *** nfs-server-2.2beta43/auth.c.OLD Sat Aug 14 21:39:56 1999 --- nfs-server-2.2beta43/auth.c Sat Aug 14 21:40:18 1999 *************** *** 479,485 **** auth_add_mountlist(ncp, cp->m, 0); } ! auth_sort_mountlist(ncp->m); return ncp; } --- 479,485 ---- auth_add_mountlist(ncp, cp->m, 0); } ! if(ncp) auth_sort_mountlist(ncp->m); return ncp; } ------ Neil Bright Computing and Networking Services College of Computing Georgia Institute of Technology