Bug 1439442
| Summary: | NFS crossmnt AVC denied for comm="rpc.mountd" name="/" dev="configfs" ino=7990 scontext=system_u:system_r:nfsd_t:s0 tcontext=system_u:object_r:configfs_t:s0 tclass=dir | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 7 | Reporter: | Yongcheng Yang <yoyang> |
| Component: | selinux-policy | Assignee: | Lukas Vrabec <lvrabec> |
| Status: | CLOSED ERRATA | QA Contact: | Milos Malik <mmalik> |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | 7.4 | CC: | lvrabec, mgrepl, mmalik, plautrba, pvrabec, ssekidde, swhiteho, xzhou |
| Target Milestone: | rc | Keywords: | Reproducer |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | selinux-policy-3.13.1-176.el7 | Doc Type: | If docs needed, set a value |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2018-04-10 12:29:42 UTC | Type: | Bug |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
# rpm -qa selinux-policy\*
selinux-policy-targeted-3.13.1-132.el7.noarch
selinux-policy-3.13.1-132.el7.noarch
#
SELinux denials caught in enforcing mode:
----
type=SYSCALL msg=audit(04/06/2017 06:15:15.368:282) : arch=x86_64 syscall=lstat success=no exit=EACCES(Permission denied) a0=0x55f139a83ab0 a1=0x7fffe3dda3a0 a2=0x7fffe3dda3a0 a3=0x0 items=0 ppid=1 pid=1309 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=unset comm=rpc.mountd exe=/usr/sbin/rpc.mountd subj=system_u:system_r:nfsd_t:s0 key=(null)
type=AVC msg=audit(04/06/2017 06:15:15.368:282) : avc: denied { search } for pid=1309 comm=rpc.mountd name=/ dev="configfs" ino=7675 scontext=system_u:system_r:nfsd_t:s0 tcontext=system_u:object_r:configfs_t:s0 tclass=dir
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SELinux denials caught in permissive mode:
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type=SYSCALL msg=audit(04/06/2017 06:17:23.320:303) : arch=x86_64 syscall=lstat success=yes exit=0 a0=0x564d6a1f27d0 a1=0x7ffdb4d18900 a2=0x7ffdb4d18900 a3=0x0 items=0 ppid=1 pid=1538 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=unset comm=rpc.mountd exe=/usr/sbin/rpc.mountd subj=system_u:system_r:nfsd_t:s0 key=(null)
type=AVC msg=audit(04/06/2017 06:17:23.320:303) : avc: denied { search } for pid=1538 comm=rpc.mountd name=/ dev="configfs" ino=7675 scontext=system_u:system_r:nfsd_t:s0 tcontext=system_u:object_r:configfs_t:s0 tclass=dir
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Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHBA-2018:0763 |
Description of problem: There is an "avc denied" log during tests of NFS crossmnt (details please find from manpage exports(5)) with root "/". Version-Release number of selected component (if applicable): RHEL-7.3 How reproducible: 100% easily Steps to Reproduce: 1. echo '/ *(ro,crossmnt,nohide,no_root_squash)' > /etc/exports 2. systemctl restart nfs 3. Mount the "/" to any mount point 4. Read contents of $mountpoint/boot/ Actual results: # echo '/ *(ro,crossmnt,nohide,no_root_squash)' >/etc/exports # systemctl restart nfs # mount localhost:/ /mnt/mnt_test/ # cat /var/log/audit/audit.log | grep denied # ls /mnt/mnt_test/boot/ &>/dev/null # cat /var/log/audit/audit.log | grep denied type=AVC msg=audit(1491444765.616:197): avc: denied { search } for pid=30483 comm="rpc.mountd" name="/" dev="configfs" ino=7560 scontext=system_u:system_r:nfsd_t:s0 tcontext=system_u:object_r:configfs_t:s0 tclass=dir # Expected results: No AVC failure. Additional info: Rhel6 doesn't have this warning.