Description of problem: "systemd-run --shell" fails because of an selinux denial. Version-Release number of selected component (if applicable): systemd-248.3-1.fc34.x86_64 selinux-policy-34.12-1.fc34.noarch How reproducible: Consistent failure. Steps to Reproduce: 1. Run "systemd-run --shell" Actual results: Command fails with exit code 208 and the following audit message: type=AVC msg=audit(1625730032.182:1683): avc: denied { watch watch_reads } for pid=346163 comm="(bash)" path="/dev/pts/2" dev="devpts" ino=5 scontext=system_u:system_r:init_t:s0 tcontext=unconfined_u:object_r:user_devpts_t:s0 tclass=chr_file permissive=0 Expected results: systemd-run --shell Running as unit: run-u713.service Press ^] three times within 1s to disconnect TTY. [root@localhost root]# Additional info: This bug seems to be similar to bug #1647162 but for "watch" and "watch_reads" permissions. The expected behaviour is achieved by loading the following selinux module: module my-systemd-run-pty 1.0; require { type user_devpts_t; type init_t; class chr_file { watch watch_reads }; } #============= init_t ============== allow init_t user_devpts_t:chr_file { watch watch_reads };
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Following SELinux denial appears in enforcing mode: ---- type=PROCTITLE msg=audit(05/13/2022 10:57:19.765:435) : proctitle=(bash) type=PATH msg=audit(05/13/2022 10:57:19.765:435) : item=0 name=/dev/pts/1 inode=4 dev=00:19 mode=character,620 ouid=root ogid=tty rdev=88:01 obj=unconfined_u:object_r:user_devpts_t:s0 nametype=NORMAL cap_fp=none cap_fi=none cap_fe=0 cap_fver=0 cap_frootid=0 type=CWD msg=audit(05/13/2022 10:57:19.765:435) : cwd=/ type=SYSCALL msg=audit(05/13/2022 10:57:19.765:435) : arch=x86_64 syscall=inotify_add_watch success=no exit=EACCES(Permission denied) a0=0x3 a1=0x55e39a4fe560 a2=0x18 a3=0x0 items=1 ppid=1 pid=1109 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=unset comm=(bash) exe=/usr/lib/systemd/systemd subj=system_u:system_r:init_t:s0 key=(null) type=AVC msg=audit(05/13/2022 10:57:19.765:435) : avc: denied { watch watch_reads } for pid=1109 comm=(bash) path=/dev/pts/1 dev="devpts" ino=4 scontext=system_u:system_r:init_t:s0 tcontext=unconfined_u:object_r:user_devpts_t:s0 tclass=chr_file permissive=0 ---- # rpm -qa selinux\* systemd\* | sort selinux-policy-34.27-1.fc34.noarch selinux-policy-targeted-34.27-1.fc34.noarch systemd-248.10-1.fc34.x86_64 systemd-libs-248.10-1.fc34.x86_64 systemd-networkd-248.10-1.fc34.x86_64 systemd-oomd-defaults-248.10-1.fc34.x86_64 systemd-pam-248.10-1.fc34.x86_64 systemd-rpm-macros-248.10-1.fc34.noarch systemd-udev-248.10-1.fc34.x86_64 #
The following SELinux denial appears in permissive mode: ---- type=PROCTITLE msg=audit(05/13/2022 11:00:28.626:439) : proctitle=(bash) type=PATH msg=audit(05/13/2022 11:00:28.626:439) : item=0 name=/dev/pts/1 inode=4 dev=00:19 mode=character,620 ouid=root ogid=tty rdev=88:01 obj=unconfined_u:object_r:user_devpts_t:s0 nametype=NORMAL cap_fp=none cap_fi=none cap_fe=0 cap_fver=0 cap_frootid=0 type=CWD msg=audit(05/13/2022 11:00:28.626:439) : cwd=/ type=SYSCALL msg=audit(05/13/2022 11:00:28.626:439) : arch=x86_64 syscall=inotify_add_watch success=yes exit=1 a0=0x3 a1=0x55e39a65b100 a2=0x18 a3=0x0 items=1 ppid=1 pid=1123 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=unset comm=(bash) exe=/usr/lib/systemd/systemd subj=system_u:system_r:init_t:s0 key=(null) type=AVC msg=audit(05/13/2022 11:00:28.626:439) : avc: denied { watch watch_reads } for pid=1123 comm=(bash) path=/dev/pts/1 dev="devpts" ino=4 scontext=system_u:system_r:init_t:s0 tcontext=unconfined_u:object_r:user_devpts_t:s0 tclass=chr_file permissive=1 ----
Seen in enforcing mode: # systemd-run --shell Running as unit: run-u21.service Press ^] three times within 1s to disconnect TTY. Finished with result: exit-code Main processes terminated with: code=exited/status=208 Service runtime: 11ms CPU time consumed: 944us # Seen in permissive mode: # systemd-run --shell Running as unit: run-u23.service Press ^] three times within 1s to disconnect TTY. [root@fedora root]# Error on PTY forwarding logic: Operation canceled Finished with result: success CPU time consumed: 7ms #
Test coverage for this bug exists in a form of PR: * https://src.fedoraproject.org/tests/selinux/pull-request/301 The PR waits for review.
FEDORA-2022-148223ef3b has been submitted as an update to Fedora 36. https://bodhi.fedoraproject.org/updates/FEDORA-2022-148223ef3b
FEDORA-2022-148223ef3b has been pushed to the Fedora 36 testing repository. Soon you'll be able to install the update with the following command: `sudo dnf upgrade --enablerepo=updates-testing --advisory=FEDORA-2022-148223ef3b` You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2022-148223ef3b See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.
FEDORA-2022-148223ef3b has been pushed to the Fedora 36 stable repository. If problem still persists, please make note of it in this bug report.