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Pretty much all intel cpus have had RDRAND in a long time. While
CPU-internal RNG are widely not trusted, for seeding hash tables it's
perfectly OK to use: we don't high quality entropy in that case, hence
let's use it.
This is only hooked up with 'high_quality_required' is false. If we
require high quality entropy the kernel is the only source we should
use.
This makes two changes to the namespacing code:
1. We'll only gracefully skip service namespacing on access failure if
exclusively sandboxing options where selected, and not mount-related
options that result in a very different view of the world. For example,
ignoring RootDirectory=, RootImage= or Bind= is really probablematic,
but ReadOnlyPaths= is just a weaker sandbox.
2. The namespacing code will now return a clearly recognizable error
code when it cannot enforce its namespacing, so that we cannot
confuse EPERM errors from mount() with those from unshare(). Only the
errors from the first unshare() are now taken as hint to gracefully
disable namespacing.
Fixes: #9844#9835
The fstab entry may contain comment/application-specific options, like
for example x-systemd.automount or x-initrd.mount.
With the recent switch to libmount, the mount options during remount are
now gathered via mnt_fs_get_options(), which returns the merged fstab
options with the effective options in mountinfo.
Unfortunately if one of these application-specific options are set in
fstab, the remount will fail with -EINVAL.
In systemd 238:
Remounting '/test-x-initrd-mount' read-only in with options
'errors=continue,user_xattr,acl'.
In systemd 239:
Remounting '/test-x-initrd-mount' read-only in with options
'errors=continue,user_xattr,acl,x-initrd.mount'.
Failed to remount '/test-x-initrd-mount' read-only: Invalid argument
So instead of using mnt_fs_get_options(), we're now using both
mnt_fs_get_fs_options() and mnt_fs_get_vfs_options() and merging the
results together so we don't get any non-relevant options from fstab.
Signed-off-by: aszlig <aszlig@nix.build>
A follow-up for commit 9d874aec45.
This patch makes "path" parameter mandatory in fd_set_*() helpers removing the
need to use fd_get_path() when NULL was passed. The caller is supposed to pass
the fd anyway so assuming that it also knows the path should be safe.
Actually, the only case where this was useful (or used) was when we were
walking through directory trees (in item_do()). But even in those cases the
paths could be constructed trivially, which is still better than relying on
fd_get_path() (which is an ugly API).
A very succinct test case is also added for 'z/Z' operators so the code dealing
with recursive operators is tested minimally.
Let's fold get_user_creds_clean() into get_user_creds(), and introduce a
flags argument for it to select "clean" behaviour. This flags parameter
also learns to other new flags:
- USER_CREDS_SYNTHESIZE_FALLBACK: in this mode the user records for
root/nobody are only synthesized as fallback. Normally, the synthesized
records take precedence over what is in the user database. With this
flag set this is reversed, and the user database takes precedence, and
the synthesized records are only used if they are missing there. This
flag should be set in cases where doing NSS is deemed safe, and where
there's interest in knowing the correct shell, for example if the
admin changed root's shell to zsh or suchlike.
- USER_CREDS_ALLOW_MISSING: if set, and a UID/GID is specified by
numeric value, and there's no user/group record for it accept it
anyway. This allows us to fix#9767
This then also ports all users to set the most appropriate flags.
Fixes: #9767
[zj: remove one isempty() call]
On the host these symlinks are created by udev, and we consider them API
and make use of them ourselves at various places. Hence when running a
private /dev, also create these symlinks so that lookups by major/minor
work in such an environment, too.
This is some extra protection for sloppy "golden master" systems, where
images are duplicated many times but the random seed is not
deleted (or reset for each copy). That golden master systems have to
reset /etc/machine-id is better known, and easier to notice (as having
the same ID will result in address conflicts and suchlike quite often).
Hence let's write the machine ID into /dev/urandom, in case it has been
initialized and unlikely the stored random seed has been provisioned
differently on each image.
Note that we don't credit the entropy either way, hence in the case
there's a cycle of a) generating the machine-id early at boot and b)
writing it back into /dev/urandom late at boot it shouldn't matter. It's
never going to make things worse, just in a few cases better.
When stdin/stdout/stderr is initialized from an fd, let's read the tty
name of it if we can, and pass that to PAM.
This makes sure that "machinectl shell" sessions have proper TTY fields
initialized that "loginctl" then shows.
This is a bit like the info link in most of GNU's --help texts, but we
don't do info but man pages, and we make them properly clickable on
terminal supporting that, because awesome.
I think it's generally advisable to link up our (brief) --help texts and
our (more comprehensive) man pages a bit, so this should be an easy and
straight-forward way to do it.
Removing this line is because cab01e9ecf
has contained the wlan keycode fix.
This line will only break the wlan keycode for all Dell Latitude and
Precision systems after cab01e9ecf.
