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data/selinux, packaging: assign a default label for /tmp/snap-private-tmp, set it during installation #17403

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Merged
sergiocazzolato merged 3 commits into from
Jul 23, 2026
Merged

data/selinux, packaging: assign a default label for /tmp/snap-private-tmp, set it during installation #17403

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190a184
data/selinux: assign a default label for /tmp/snap-private-tmp
bboozzoo Jul 23, 2026
ad77936
packaging: restore default label of /tmp/snap-private-tmp after insta…
bboozzoo Jul 23, 2026
299a253
data/selinux: allow the snap command to probe for /tmp/snap-private-t…
bboozzoo Jul 23, 2026
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2 changes: 2 additions & 0 deletions data/selinux/snappy.fc
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Expand Up @@ -44,6 +44,8 @@ ifdef(`distro_debian',`
/lib/systemd/system/snapd.* -- gen_context(system_u:object_r:snappy_unit_file_t,s0)
')

/tmp/snap-private-tmp -d gen_context(system_u:object_r:snappy_tmp_t,s0)

/var/run/snapd(/.*)? gen_context(system_u:object_r:snappy_var_run_t,s0)
/var/run/snapd\.socket -s gen_context(system_u:object_r:snappy_var_run_t,s0)
/var/run/snapd-snap\.socket -s gen_context(system_u:object_r:snappy_var_run_t,s0)
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2 changes: 2 additions & 0 deletions data/selinux/snappy.te
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Expand Up @@ -873,6 +873,8 @@ snappy_stream_connect(snappy_cli_t)
userdom_search_user_tmp_dirs(snappy_cli_t)
# create /run/user/<uid>/snap.<name> directories
userdom_manage_tmp_dirs(snappy_cli_t)
# the snap command probes for /tmp/snap-private-tmp presence
allow snappy_cli_t snappy_tmp_t:dir getattr;

# allow snappy_cli_t to exec() into the snapd binary which implements
# snap CLI handler and other internal snapd tools
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4 changes: 4 additions & 0 deletions packaging/fedora/snapd.spec
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Expand Up @@ -1009,6 +1009,10 @@ fi
%post selinux
%selinux_modules_install %{_datadir}/selinux/packages/snappy.pp.bz2
%selinux_relabel_post
# Ensure the private tmp directory for snap-confine exists and has the correct
# SELinux label now that the policy module is loaded
install -d -m 0700 /tmp/snap-private-tmp
restorecon /tmp/snap-private-tmp || :

%posttrans selinux
%selinux_relabel_post
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4 changes: 4 additions & 0 deletions packaging/opensuse/snapd.spec
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Expand Up @@ -514,6 +514,10 @@ fi

%post selinux
%selinux_modules_install -s %{selinuxtype} %{_datadir}/selinux/packages/snappy.pp.bz2
# Ensure the private tmp directory for snap-confine exists and has the correct
# SELinux label now that the policy module is loaded
install -d -m 0700 /tmp/snap-private-tmp
restorecon /tmp/snap-private-tmp || :

%preun selinux
%selinux_relabel_pre -s %{selinuxtype}
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