bus: break reference cycle between bus and messages
Because messages in the read and write queues hold a reference on the
bus, and the bus holds a reference on each of them, we would never
free the bus if the read or write queues were not empty. Explicitly
substract the number of messages in those queue from the bus reference
count when deciding whether to free or not.
A simple test which creates and unrefs simple objects is added.
core/manager: print info about interesting signals
Information about signals which are not routinely received by systemd
are printed at info level. This should make it easier to see what is
happening in the system.
Tom Gundersen [Wed, 1 Jan 2014 14:16:34 +0000 (15:16 +0100)]
networkd: add DHCPv4 support
This adds basic DHCPv4 support. Link-sense is enabled unconditionally,
but the plan is to make that configurable.
I tested this in a VM with lots of NICs and over wifi in the various
coffee shops I found this Christmas, but more testing would definitely
be appreciated.
Tom Gundersen [Wed, 1 Jan 2014 14:16:10 +0000 (15:16 +0100)]
networkd: distinguish between static and dynamic addresses/routes
Static addresses/routes are associated with a network. Dynamic
addresses/routes are associtade with links (as the corresponding network
may be shared by several links).
GREEDY_REALLOC needs to have two size variables: one for the
allocated size, and a second one for the used size. Using
the allocated size only lead to leaving some elements unitialized
and assigning some more than once.
Before 34a3baa4d 'sleep-config: Dereference pointer before check for NULL'
oom conditions would not be detected properly. After that commit, a double
free was performed.
Rework the whole function to be easier to understand, and also replace
strv_split_nulstr with strv_new, since we know the strings anyway.
Stefan Beller [Mon, 30 Dec 2013 16:43:52 +0000 (17:43 +0100)]
sleep-config: Dereference pointer before check for NULL
This fixes a bug pointed out by http://css.csail.mit.edu/stack/
(Optimization-unstable code)
It is a similar fix as f146f5e159 (2013-12-30, core:
Forgot to dereference pointer when checking for NULL)
To explain this bug consider the following similar, but simpler code:
if (!p)
free(*p)
Assume the if condition evaluates to true, then we will access *p,
which means the compiler can assume p is a valid pointer, so it could
dereference p and use the value *p.
Assuming p as a valid pointer, !p will be false.
But initally we assumed the condition evaluates to true.
By this reasoning the optimizing compiler can deduce, we have dead code.
("The if will never be taken, as *p must be valid, because otherwise
accessing *p inside the if would segfault")
This led to an error message of the static code checker, so I checked the
code in question.
As we access *modes and *states before the check in the changed line of
this patch, I assume the line to be wrong and we actually wanted to check
for *modes and *states being both non null.
Stefan Beller [Sun, 29 Dec 2013 23:09:56 +0000 (00:09 +0100)]
bootchart: Remove unneeded check for NULL
Directly before the changed line there is:
while ((parent->next_ps && parent->pid != ps->ppid))
parent = parent->next_ps;
which looks one element ahead of the list, hence we can rely on parent
being non null here.
If 'parent' were NULL at that while loop already, it would crash as we're
dereferencing 'parent' when checking for next_ps already.
Signed-off-by: Stefan Beller <stefanbeller@googlemail.com>
The return value of 0 would be treated as failure by mistake,
resulting in " SystemError: error return without exception set".
The way that set_error() is used is changed to be the same
everywhere.
scan-build is a static analyzer in llvm. As ususal static analyzers
tend to mostly find theoretical bugs in software that has been in
production for a while. For in-development code it can be useful to
check if new issues is added as there is a chance to spot real problems
before release. For systemd we are now down to 297 issues - the vast
majority are false positives because the tool does not understand the
cleanup attribute.
Running clang's static analyzer scan-build is a bit messy. You have to
run both configure and make "inside" the build-scan tool. To have an
easy shortcut from autogen.sh I thus call both directly from it. This
makes it different from the other options in autogen.sh. I chose 's'
for static analysis.
scan-build is in the package clang-analyzer on fedora.
For a while I have been cleaning up warnings when building with clang.
There are currently only two sources of warnings left: Wcast-align and Wgnu.
I am not convinced that fixing up those up is feasible so I run with them
disabled to spot regressions. E.g. clang is a bit more strict wrt to unused
variables with the cleanup attribute and I have fixed a number of those since.
Like the other options in autogen.sh I have a shortcut for clang as well. I use
'l' for llvm.
Lubomir Rintel [Fri, 6 Dec 2013 13:05:49 +0000 (14:05 +0100)]
selinux: Check access vector for enable/disable perm for each unit file
SELinux check will be done using the context of the unit file as as a
target instead of the default init_t context, allowing selinux control
on the level of individual units.
bus: add a temporary hard-coded policy to proxyd to make gdm work
gdm relies on the policy to deny its own requests to not deadlock. Given
that we currently do not enforce any policy in the dbus1 compat proxy
service this means that gdm will necessarily deadlock on our systems.
To work around this, enforce a fixed policy teomporarily, until we
interpret the legacy XML policy in full.
Booh, gdm, booh, for requring this and making me waste two days on
tracking this brokenness down.
Jan Engelhardt [Thu, 26 Dec 2013 01:47:45 +0000 (02:47 +0100)]
man: grammar and wording improvements
This is a recurring submission and includes corrections to:
- missing words, preposition choice.
- change of /lib to /usr/lib, because that is what most distros are
using as the system-wide location for systemd/udev files.
Dave Reisner [Wed, 25 Dec 2013 17:58:37 +0000 (12:58 -0500)]
completion: don't offer completions for journalctl -b
Since this is a shortopt with an optional argument, assume the user
knows what they're doing. The longopts --boot and --this-boot will
continue to offer boot IDs as completions.
Dave Reisner [Wed, 25 Dec 2013 17:24:19 +0000 (12:24 -0500)]
journalctl: remove unexpected behavior of journalctl -b
This flag shouldn't try and consume the following argument. It should
behave like every other flag which takes an optional argument when
parsed by getopt_long.
Even if the lower-leveld dbus1 protocol calls it "serial", let's expose
the word "cookie" for this instead, as this is what kdbus uses and since
it doesn't imply monotonicity the same way "serial" does.
Dave Reisner [Tue, 24 Dec 2013 21:42:06 +0000 (16:42 -0500)]
sleep-config: fix useless check for swapfile type
Since 0c6f1f4ea49 the check was useless, because the kernel will
ever only write "partition" or "file" there.
OTOH, it is possible that "\\040(deleted)" (escaped " (deleted)")
will be added for removed files. This should not happen, so add
a warning to detect those cases.
tmpfiles: introduce the concept of unsafe operations
Various operations done by systemd-tmpfiles may only be safely done at
boot (e.g. removal of X lockfiles in /tmp, creation of /run/nologin).
Other operations may be done at any point in time (e.g. setting the
ownership on /{run,var}/log/journal). This distinction is largely
orthogonal to the type of operation.
A new switch --unsafe is added, and operations which should only be
executed during bootup are marked with an exclamation mark in the
configuration files. systemd-tmpfiles.service is modified to use this
switch, and guards are added so it is hard to re-start it by mistake.
If we install a new version of systemd, we actually want to enforce
some changes to tmpfiles configuration immediately. This should now be
possible to do safely, so distribution packages can be modified to
execute the "safe" subset at package installation time.
/run/nologin creation is split out into a separate service, to make it
easy to override.