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CVE-2022-4415: systemd: coredump not respecting fs.suid_dumpable kernel setting
Affects systemd >= 247 with libacl support enabled.
This is a merge of https://github.com/systemd/systemd-security/pull/12/.
I'm doing the merge locally because github doesn't support merging directly
from systemd/systemd-security to systemd/systemd.
Previously 'systemctl edit' would only operate on
'override.conf', but users may need more than that.
Thus the new option '--drop-in' is added to allow
users to specify the drop-in file name.
Closes#25767
Process renaming happens very seldomly so we are able to afford proper
permission check, i.e. actually check for CAP_SYS_RESOURCE capability
instead of euid.
-1 was used everywhere, but -EBADF or -EBADFD started being used in various
places. Let's make things consistent in the new style.
Note that there are two candidates:
EBADF 9 Bad file descriptor
EBADFD 77 File descriptor in bad state
Since we're initializating the fd, we're just assigning a value that means
"no fd yet", so it's just a bad file descriptor, and the first errno fits
better. If instead we had a valid file descriptor that became invalid because
of some operation or state change, the other errno would fit better.
In some places, initialization is dropped if unnecessary.
When generating verity partitions, we only know the partition UUID
of the verity data and hash partition after doing the verity
formatting. This means we can't use the verity partition UUID as
input for deriving the filesystem/luks UUIDs. Currently, we derive
the filesystem/luks UUID from the null UUID instead, which isn't
ideal. Instead, let's always generate a partition UUID and use it
to derive the fs/luks UUIDs, but only use it as the actual partition
UUID if we're not doing verity for the partition.
If everything points to the fact that TPM2 should work, but then the
driver fails to initialize we should handle this gracefully and not
cause failing services all over the place.
Fixes: #25700
When an AP goes up, the kernel may emit a netlink event indicating that
the interface has gained carrier. In that event, we should check if the
SSID has changed before attempting to reconfigure. Not doing so means
that the link->ssid member is not updated, leading to a potential
mismatch if some of the .network configurations match on SSID=.
There are however scenarios where the above heuristic is not enough.
Specifically, if the interface carrier state flip-flops within a short
enough interval, the internal throttling of netlink events inside the
kernel may suppress intermediate linkdown+linkup events (cf. Linux
net/core/link_watch.c). So there is no linkup event to react on.
To improve on the latter scenario, it is proposed to make newer kernels
emit an NL80211_CMD_START_AP multicast event when an AP goes up. This
event will not be dropped by link_watch. systemd-networkd can then react
to such events as well, and optionally reconfigure the link if the SSID
has changed. This will only work with newer kernels though.
As you can see in the below, the dropped dependency Before=issue-24990.service
is not logged, but the dependency Before=test1.service which is not owned by
the units generated by the TEST-26 is logged.
Before:
systemd[1]: issue-24990.service: Dependency After=test1.service dropped, merged into issue-24990.service
systemd[1]: issue-24990.service: Dependency Before=test1.service dropped, merged into issue-24990.service
After:
systemd[1]: issue-24990.service: Dependency After=test1.service is dropped, as test1.service is merged into issue-24990.service.
systemd[1]: issue-24990.service: Dependency Before=issue-24990.service in test1.service is dropped, as test1.service is merged into issue-24990.service.
