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So, i think "erofs" is probably the better, more modern alternative to
"squashfs". Many of the benefits don't matter too much to us I guess,
but there's one thing that stands out: erofs has a UUID in the
superblock, squashfs has not. Having an UUID in the superblock matters
if the file systems are used in an overlayfs stack, as overlayfs uses
the UUIDs to robustly and persistently reference inodes on layers in
case of metadata copy-up.
Since we probably want to allow such uses in overlayfs as emplyoed by
sysext (and the future syscfg) we probably should ramp up our erofs game
early on. Hence let's natively support erofs, test it, and in fact
mention it in the docs before squashfs even.
- Mention "/please-review" in the contributing guide
- Remove "needs-rebase" on push
- Don't add "please-review" if a green label is set
- Don't add please-review label to draft PRs
- Add please-review when a PR moves out of draft
- add missing assertions,
- use size_t for buffser size or memory index,
- handle empty input more gracefully,
- return the length or the result string,
- fix off-by-one issue when the prefix is already long enough.
When a pull request is opened/updated, add "please-review" and
remove a few other labels.
When a comment is made with /please-review on a PR. Add the
"please-review" label to the PR.
This drops the special casing for s390 and other archs, which was
cargo-culted from glibc. Given it's not obvious why it exists, and is at
best an optimization let's simply avoid it, in particular as the archs
are relatively non-mainstream.
Inspired by: #25636
Let's allow using this in code shared between userspace and EFI mode.
Also, don't implement these functions via endianness conversions given
we don't actually want to convert endianess here.
A FreezeUnit operation can hang due to the presence of kernel threads
(see last 2 commits). Keeping the default configuration will mean the
system will hang for 25 seconds in suspend waiting for the response. 1.5
seconds should be sufficient for most cases.
The `frozen` state can be `0` while the processes are indeed frozen (see
last commit). Therefore do not respect cgroup.events when checking
whether thawing is necessary.
This is useful for operating in ephemeral, writable mode on any image,
including read-only ones. It also has the benefit of not keeping the
image file's filesystem busy.
Inspired by the discussions in #25648
Quoting "Trusted Platform Module Library - Part 3: Commands (Rev. 01.59)":
"pcrUpdateCounter – this parameter is updated by TPM2_PolicyPCR(). This value
may only be set once during a policy. Each time TPM2_PolicyPCR() executes, it
checks to see if policySession->pcrUpdateCounter has its default state,
indicating that this is the first TPM2_PolicyPCR(). If it has its default value,
then policySession->pcrUpdateCounter is set to the current value of
pcrUpdateCounter. If policySession->pcrUpdateCounter does not have its default
value and its value is not the same as pcrUpdateCounter, the TPM shall return
TPM_RC_PCR_CHANGED.
If this parameter and pcrUpdateCounter are not the same, it indicates that PCR
have changed since checked by the previous TPM2_PolicyPCR(). Since they have
changed, the previous PCR validation is no longer valid."
The TPM will return TPM_RC_PCR_CHANGED if any PCR value changes (no matter
which) between validating the PCRs binded to the enrollment and unsealing the
HMAC key, so this patch adds a retry mechanism in this case.
Fixes#24906
getpidcon() might set con to NULL, even when it returned a 0 return
code[0]. The subsequent strlen(con) will then cause a segfault.
Alternatively the behaviour could also be changed in getpidcon. I
don't know whether the libselinux folks are comitted to the current
behaviour, but the getpidcon man page doesn't really make it obvious
this case could happen.
[0] fb7f35495f/libselinux/src/procattr.c (L155-L158)
Sometimes a freeze operation can hang due to the presence of kernel
threads inside the unit cgroup (e.g. QEMU-KVM). This ensures that the
ThawUnit operation invoked by systemd-sleep at wakeup always thaws the
unit.
`FreezeUnit` can fail even when some units did got frozen, causing some
user units to be frozen. A possible symptom is `user@.service` being
frozen while still being able to log in over SSH.
