systemd: tmpfiles fixes#1136
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tmpfiles cranks RLIMIT_NOFILE [0]:
> /* Descending down file system trees might take a lot of fds */
> (void) rlimit_nofile_bump(HIGH_RLIMIT_NOFILE);
yielding
```
AVC avc: denied { sys_resource } for pid=1439 comm="systemd-tmpfile" capability=24
scontext=system_u:system_r:systemd_tmpfiles_t:s0
tcontext=system_u:system_r:systemd_tmpfiles_t:s0
tclass=capability
AVC avc: denied { setrlimit } for pid=1439 comm="systemd-tmpfile"
scontext=system_u:system_r:systemd_tmpfiles_t:s0
tcontext=system_u:system_r:systemd_tmpfiles_t:s0
tclass=process
```
[0] https://github.com/systemd/systemd/blob/4d18eac5a99dbc8198f25cde9175e66f27e92cbc/src/tmpfiles/tmpfiles.c#L4867-L4868
Signed-off-by: Sam James <sam@gentoo.org>
For example, I have `/var/tmp/portage` on zram. On startup, zram-generator
mounts it, and later, systemd-tmpfiles processes a (pre-existing) tmpfiles.d
entry to create `/var/tmp/portage`. We need a way to keep the context.
Allow tmpfiles to relabel for these cases:
```
AVC avc: denied { getattr } for pid=1439 comm="systemd-tmpfile" path="/var/tmp/portage" dev="zram0" ino=128
scontext=system_u:system_r:systemd_tmpfiles_t:s0
tcontext=system_u:object_r:unlabeled_t:s0
tclass=dir
AVC avc: denied { setattr } for pid=1439 comm="systemd-tmpfile" name="/" dev="zram0" ino=128
scontext=system_u:system_r:systemd_tmpfiles_t:s0
tcontext=system_u:object_r:unlabeled_t:s0
tclass=dir
AVC avc: denied { relabelfrom } for pid=1439 comm="systemd-tmpfile" name="/" dev="zram0" ino=128
scontext=system_u:system_r:systemd_tmpfiles_t:s0
tcontext=system_u:object_r:unlabeled_t:s0
tclass=dir
```
Signed-off-by: Sam James <sam@gentoo.org>
audit installs a tmpfiles.d file for /var/log/audit [0]:
```
AVC avc: denied { relabelfrom } for pid=1439 comm="systemd-tmpfile" name="audit" dev="dm-0" ino=1246029
scontext=system_u:system_r:systemd_tmpfiles_t:s0
tcontext=system_u:object_r:auditd_log_t:s0
tclass=dir
AVC avc: denied { relabelto } for pid=1439 comm="systemd-tmpfile" name="audit" dev="dm-0" ino=1246029
scontext=system_u:system_r:systemd_tmpfiles_t:s0
tcontext=system_u:object_r:auditd_log_t:s0
tclass=dir
```
An explicit allow is needed because auditd_log_t is a security_file.
[0] linux-audit/audit-userspace@eb3a9a6
Signed-off-by: Sam James <sam@gentoo.org>
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A few tmpfiles fixes.