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Description of problem:
example command line in man page unshare(1) does not work:
'''
[root@rhel-7-9-latest ~]$ man unshare | grep -A 8 EXAMPLES
EXAMPLES
# unshare --fork --pid --mount-proc readlink /proc/self
1
Establish a PID namespace, ensure we're PID 1 in it against newly mounted procfs instance.
$ unshare --map-root-user --user sh -c whoami
root
Establish a user namespace as an unprivileged user with a root user within it.
[foo@rhel-7-9-latest ~]$ unshare --map-root-user --user sh -c whoami
unshare: unshare failed: Invalid argument
[foo@rhel-7-9-latest ~]$ lsb_release -sir
RedHatEnterpriseServer 7.9
[foo@rhel-7-9-latest ~]$ uname -r
3.10.0-1157.el7.x86_64
[foo@rhel-7-9-latest ~]$ rpm -qf /usr/bin/unshare
util-linux-2.23.2-65.el7.x86_64
'''
Version-Release number of selected component (if applicable):
util-linux-2.23.2-65.el7.x86_64
How reproducible:
always on RHEL-7
Steps to Reproduce:
1. #run the command line in man page unshare(1)
unshare --map-root-user --user sh -c whoami
Actual results:
'''
[foo@rhel-7-9-latest ~]$ unshare --map-root-user --user sh -c whoami
unshare: unshare failed: Invalid argument
'''
Expected results:
'''
[foo@rhel-8-3-latest ~]$ unshare --map-root-user --user sh -c whoami
root
'''
Additional info:
it works fine on RHEL-8
Comment 5RHEL Program Management
2022-01-22 07:27:04 UTC
After evaluating this issue, there are no plans to address it further or fix it in an upcoming release. Therefore, it is being closed. If plans change such that this issue will be fixed in an upcoming release, then the bug can be reopened.
Description of problem: example command line in man page unshare(1) does not work: ''' [root@rhel-7-9-latest ~]$ man unshare | grep -A 8 EXAMPLES EXAMPLES # unshare --fork --pid --mount-proc readlink /proc/self 1 Establish a PID namespace, ensure we're PID 1 in it against newly mounted procfs instance. $ unshare --map-root-user --user sh -c whoami root Establish a user namespace as an unprivileged user with a root user within it. [foo@rhel-7-9-latest ~]$ unshare --map-root-user --user sh -c whoami unshare: unshare failed: Invalid argument [foo@rhel-7-9-latest ~]$ lsb_release -sir RedHatEnterpriseServer 7.9 [foo@rhel-7-9-latest ~]$ uname -r 3.10.0-1157.el7.x86_64 [foo@rhel-7-9-latest ~]$ rpm -qf /usr/bin/unshare util-linux-2.23.2-65.el7.x86_64 ''' Version-Release number of selected component (if applicable): util-linux-2.23.2-65.el7.x86_64 How reproducible: always on RHEL-7 Steps to Reproduce: 1. #run the command line in man page unshare(1) unshare --map-root-user --user sh -c whoami Actual results: ''' [foo@rhel-7-9-latest ~]$ unshare --map-root-user --user sh -c whoami unshare: unshare failed: Invalid argument ''' Expected results: ''' [foo@rhel-8-3-latest ~]$ unshare --map-root-user --user sh -c whoami root ''' Additional info: it works fine on RHEL-8