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These restrictions are implied by systemd options used for
systemd-udevd.service, i.e. MountFlags=slave and
IPAddressDeny=any. However, there are users out there getting tripped by
this, so let's make things clear in the man page so the actual
restrictions we implement by default have better visibility.
When the DHCP server returns both a Classless Static Routes
option and a Static Routes option, the DHCP client MUST ignore the
Static Routes option.
Closes#7792
The commit b1bfb84804 makes chase_symlinks()
recognize empty string for root as an invalid parameter. However,
empty root is often used e.g. systemd-nspawn.
This makes chase_symlinks() support empty string safely.
Fixes#7927.
For people who use debug messages, maybe it is helpful to know that
PrivateDevices= failed due to mknod(), and which device node.
(The other (un-logged) failures could be while mounting filesystems e.g. no
CAP_SYS_ADMIN which is the common case, or missing /dev/shm or /dev/pts,
or missing /dev/ptmx).
#7886 caused PrivateDevices= to silently fail-open.
https://github.com/systemd/systemd/pull/7886#issuecomment-358542849
Allow PrivateDevices= to succeed, in creating /dev/ptmx, even though
DeviceControl=closed applies.
No specific justification was given for blocking mknod of /dev/ptmx. Only
that we didn't seem to need it, because we weren't creating it correctly as
a device node.
Add a new -Dllvm-fuzz=true option that can be used to build against
libFuzzer and update the oss-fuzz script to work outside of the
oss-fuzz build environment.
The fuzz targets are intended to be fast and only target systemd
code, so they don't need to call out to any dependencies. They also
shouldn't depend on shared libraries outside of libc, so we disable
every dependency when compiling against oss-fuzz. This also
simplifies the upstream build environment significantly.
The fuzzers will be used by oss-fuzz to automatically and
continuously fuzz systemd.
This commit includes the build tooling necessary to build fuzz
targets, and a fuzzer for the DNS packet parser.
This should have no behavioural effect; it just confused me.
All the other mount directories in this function are created as 0755.
Some of the mounts are allowed to fail - mqueue and hugepages.
If the /dev/mqueue mount target was created with the permissive mode 01777,
to match the filesystem we're trying to mount there, then a mount failure
would allow unprivileged users to write to the /dev filesystem, e.g. to
exhaust the available space. There is no reason to allow this.
(Allowing the user read access (0755) seems a reasonable idea though, e.g. for
quicker troubleshooting.)
We do not allow failure of the /dev/shm mount, so it doesn't matter that
it is created as 01777. But on the same grounds, we have no *reason* to
create it as any specific mode. 0755 is equally fine.
This function will be clearer by using 0755 throughout, to avoid
unintentionally implying some connection between the mode of the mount
target, and the mode of the mounted filesystem.
`newinstance` (and `ptmxmode`) options of devpts are _not_ used by
PrivateDevices=. (/dev/pts is shared, similar to how /dev/shm and
/dev/mqueue are handled). It is used by nspawn containers though.
Also CONFIG_DEVPTS_MULTIPLE_INSTANCES was removed in 4.7-rc2
eedf265aa0
and no longer needs to be set, so make that clearer to avoid confusion.
If /dev/tty did not exist, or had st_rdev == 0, we ignored it. And the
same is true for null, zero, full, random, urandom.
If /dev/ptmx did not exist, we treated this as a failure. If /dev/ptmx had
st_rdev == 0, we ignored it.
This was a very recent change, but there was no reason for ptmx creation
specifically to treat st_rdev == 0 differently from non-existence. This
confuses me when reading it.
Change the creation of /dev/ptmx so that st_rdev == 0 is
treated as failure.
This still leaves /dev/ptmx as a special case with stricter handling.
However it is consistent with the immediately preceding creation of
/dev/pts/, which is treated as essential, and is directly related to ptmx.
I don't know why we check st_rdev. But I'd prefer to have only one
unanswered question here, and not to have a second unanswered question
added on top.
If we take a relative path we first make it absolute, based on the
current working directory. But if CHASE_PREFIX_ROOT is passe we are
supposed to make the path absolute taking the specified root path into
account, but that makes no sense if we talk about the current working
directory as that is relative to the host's root in any case. Hence,
let's refuse this politely.
Some newer BIOS versions of the TrekStor SurfTab wintron 7.0 tablet use
different (better) DMI strings, update the existing 60-sensors.hwdb
entry for this tablet to also work with the newer BIOS.
…otherwise try to clone it as a device node
On most contemporary distros /dev/ptmx is a device node, and
/dev/pts/ptmx has 000 inaccessible permissions. In those cases
the symlink /dev/ptmx -> /dev/pts/ptmx breaks the pseudo tty support.
In that case we better clone the device node.
OTOH, in nspawn containers (and possibly others), /dev/pts/ptmx has
normal permissions, and /dev/ptmx is a symlink. In that case make the
same symlink.
fixes#7878
For old kernels not supporting AmbientCapabilities=, networkd is
started as root with limited capabilities. Then, networkd cannot
chown the directories under runtime directory as
CapabilityBoundingSet= does not contains enough capabilities.
This makes these directories are created after dropping privileges.
Thus, networkd does not need to chown them anymore.
Fixes#7863.
This fixes the following warnings:
```
[194/1521] Compiling C object 'src/libsystemd-network/systemd-network@sta/dhcp6-option.c.o'.
../../git/systemd/src/libsystemd-network/dhcp6-option.c:110:25: warning: taking address of packed member 'id' of class or structure 'ia_na' may result in an unaligned pointer value [-Waddress-of-packed-member]
iaid = &ia->ia_na.id;
^~~~~~~~~~~~
../../git/systemd/src/libsystemd-network/dhcp6-option.c:115:25: warning: taking address of packed member 'id' of class or structure 'ia_ta' may result in an unaligned pointer value [-Waddress-of-packed-member]
iaid = &ia->ia_ta.id;
^~~~~~~~~~~~
2 warnings generated.
```
