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Description of problem: Fedora 18 (IIRC) added the non-upstream CAP_COMPROMISE_KERNEL capability. In Fedora 21 (and it looks like F20 too, though I've not 100% checked), CAP_COMPROMISE_KERNEL has been removed again. The libcap-ng library still tries to use it For example doing this call capng_clear(CAPNG_SELECT_BOTH); if (capng_change_id(uid, gid, CAPNG_DROP_SUPP_GRP | CAPNG_CLEAR_BOUNDING)) { fprintf(stderr, "Cannot change ID to %d:%d: %s\n", uid, gid, strerror(errno)); return -1; } Results in an EINVAL error. Strace shows it fails on ...snip... prctl(PR_CAPBSET_DROP, 0x20, 0, 0, 0) = 0 prctl(PR_CAPBSET_DROP, 0x21, 0, 0, 0) = 0 prctl(PR_CAPBSET_DROP, 0x22, 0, 0, 0) = 0 prctl(PR_CAPBSET_DROP, 0x23, 0, 0, 0) = 0 prctl(PR_CAPBSET_DROP, 0x24, 0, 0, 0) = 0 prctl(PR_CAPBSET_DROP, 0x25, 0, 0, 0) = -1 EINVAL (Invalid argument) 0x25 == 37 == CAP_COMPROMISE_KERNEL This is breaking use of capng by libvirt-sandbox and probably other apps too. It looks like capng simply needs a plain rebuild to detect the changed CAP_LAST value Version-Release number of selected component (if applicable): libcap-ng-devel-0.7.3-5.fc20
Moving to F20, since I've confirmed it is definitely affected.
libcap-ng-0.7.3-6.fc20 was built to resolve this issue.
libcap-ng-0.7.3-6.fc20 has been submitted as an update for Fedora 20. https://admin.fedoraproject.org/updates/libcap-ng-0.7.3-6.fc20
Package libcap-ng-0.7.3-6.fc20: * should fix your issue, * was pushed to the Fedora 20 testing repository, * should be available at your local mirror within two days. Update it with: # su -c 'yum update --enablerepo=updates-testing libcap-ng-0.7.3-6.fc20' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/FEDORA-2013-21353/libcap-ng-0.7.3-6.fc20 then log in and leave karma (feedback).
libcap-ng-0.7.3-6.fc20 has been pushed to the Fedora 20 stable repository. If problems still persist, please make note of it in this bug report.
*** Bug 1027032 has been marked as a duplicate of this bug. ***