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Kernels >= 5.8 have added new fields to the dmi/id/modalias file in the
middle of the modalias (instead of adding them at the end).
Specifically new ":br<value>:" and (optional) ":efr<value>:" fields have
been added between the ":bd<value>:" and ":svn<value>:" fields.
Note the 5.13.0 and 5.14.0 kernels also added a new ":sku<value>:" field
between the ":pvr<value>:" and ":rvn<value>:" fields, this has been fixed
in later 5.13.y and 5.14.y releases, by moving the sku field to the end:
https://lore.kernel.org/lkml/20210831130508.14511-1-hdegoede@redhat.com/
Unfortunately the same cannot be done for the new br and efr fields since
those have been added more then a year ago and hwdb even already has some
newer entries relying on the new br field being there (and thus not working
with older kernels).
Fix the issue with the br and efr fields through the following changes:
1. Replace any matches on ":br<value>" from newer entries with an '*'
2. Replace "bd<value>:svn<value>" matches with: "bd<value>:*svn<value>"
inserting an '*' where newer kernels will have the new br + efr fields
This makes these matches working with old as well as new kernels.
Link: https://github.com/systemd/systemd/issues/20550
Link: https://github.com/systemd/systemd/pull/20562
It's not "const", it can change any time if people change the fs, and we
don#t send out notifications for it. Hence don't claim it was const.
(Otherwise clients might cache it, but they should not)
Prompted-by: #20792
According to the various man pages of "resolvconf" the -u switch is for:
"-u Just run the update scripts (if updating is enabled)."
"-u Force resolvconf to update all its subscribers. resolvconf does not
update the subscribers when adding a resolv.conf that matches what
it already has for that interface."
We have no "subscribers", we ourselves are the only "subscriber" we
support. Hence it's probably better to ignore such a request and make it
a NOP, then to fail.
Fixes: #20748
Currently `systemd-sysctl` binary is used in `systemd-sysctl.service`
which is mostly configured as `oneshot`. There are situations where one
would like to use systemd to maintain Sysctl configurations on a host,
using a configuration managers such as Chef or Puppet, by apply
configurations every X duration.
The problem with using `systemd-sysctl` is that it writes all the Sysctl
settings, even if the values for those settings have not changed. From
experience, we have observed that some Sysctl settings cause actions in
the kernel upon writing(like dropping caches) which in turn cause
undesired side effects.
This patch tries to minimize such side effects by comparing values
before writing.
Also,
- drop unnecessary +1 from buffer size, as IF_NAMESIZE or IFNAMSIZ
includes the nul at the end.
- format_ifname() does not update buffer on failure,
- introduces format_ifname_alloc(), FORMAT_IFNAME(), and their friends.
Getting certificates for dm-verity roothash signing into the trusted
kernel keychain is a royal PITA (means recompiling or rebooting with
shim), hence let's add a minimal userspace PKCS7 validation as well.
The mechanism is really simple and compatible with the verification the
kernel does. The only difference is that the certificates are searched
in /etc/verity.d/*.crt (and similar dirs in /usr/lib/, …).
We'll first try validation by passing the PKCS#7 data to the kernel, but
if that doesn't work we'll see if one of the certificates found that way
works and then attempt to attach the image without passing the PKCS#7
data to the kernel.
This makes it very easy to have fully validated GPT disk images. For
example, just copy the 'mkosi.secure-boot.crt' file you have in your
mkosi build dir to /etc/verity.d/ and things should just work.
