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Otherwise they can be optimized away with -DNDEBUG
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Types used for pids and uids in various interfaces are unpredictable.
Too bad.
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cunescape_length_with_prefix() is called with the length as an
argument, so it cannot rely on the buffer being NUL terminated.
Move the length check before accessing the memory.
When an incomplete escape sequence was given at the end of the
buffer, c_l_w_p() would read past the end of the buffer. Fix this
and add a test.
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Sometimes it is necessary to stop a generator from running. Either
because of a bug, or for testing, or some other reason. The only way
to do that would be to rename or chmod the generator binary, which is
inconvenient and does not survive upgrades. Allow masking and
overriding generators similarly to units and other configuration
files.
For the systemd instance, masking would be more common, rather than
overriding generators. For the user instances, it may also be useful
for users to have generators in $XDG_CONFIG_HOME to augment or
override system-wide generators.
Directories are searched according to the usual scheme (/usr/lib,
/usr/local/lib, /run, /etc), and files with the same name in higher
priority directories override files with the same name in lower
priority directories. Empty files and links to /dev/null mask a given
name.
https://bugs.freedesktop.org/show_bug.cgi?id=87230
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Remove the optional sepearate opening of the directory,
it would be just too complicated with the change to
multiple directories.
Move the middle of execute_directory() to a seperate
function to make it easier to grok.
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This macro calculates A / B but rounds up instead of down. We explicitly
do *NOT* use:
(A + B - 1) / A
as it suffers from an integer overflow, even though the passed values are
properly tested against overflow. Our test-cases show this behavior.
Instead, we use:
A / B + !!(A % B)
Note that on "Real CPUs" this does *NOT* result in two divisions. Instead,
instructions like idivl@x86 provide both, the quotient and the remainder.
Therefore, both algorithms should perform equally well (I didn't verify
this, though).
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In test_raw_clone, make sure the cloned thread calls _exit() and in the parent
thread call waitpid(..., __WCLONE) to wait for the child thread to terminate,
otherwise there is a race condition where the child thread will log to the
console after the test process has already exited and the assertion from the
child thread might not be enforced.
The absence of this patch might also create problems for other tests that would
be added after this one, since potentially both parent and child would run
those tests as the child would continue running.
Tested by confirming that the logs from the child are printed before the test
terminates and that a false assertion in the child aborts the test with a core
dump.
[zj: also add check for the return value.]
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The asserts used in the tests should never be allowed to be optimized away.
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Commit a2a5291b3f5 changed the parser to reject unfinished quoted
strings. Unfortunately it introduced an error where a trailing
backslash would case an infinite loop. Of course this must fixed, but
the question is what to to instead. Allowing trailing backslashes and
treating them as normal characters would be one option, but this seems
suboptimal. First, there would be inconsistency between handling of
quoting and of backslashes. Second, a trailing backslash is most
likely an error, at it seems better to point it out to the user than
to try to continue.
Updated rules:
ExecStart=/bin/echo \\ → OK, prints a backslash
ExecStart=/bin/echo \ → error
ExecStart=/bin/echo "x → error
ExecStart=/bin/echo "x"y → error
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fork() is not async-signal-safe and calling it from the signal handler
could result in a deadlock when at_fork() handlers are called. Using
the raw clone() syscall sidesteps that problem.
The tricky part is that raise() does not work, since getpid() does not
work. Add raw_getpid() to get the real pid, and use kill() instead of
raise().
https://bugs.freedesktop.org/show_bug.cgi?id=86604
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resulting name is actually valid
Also, rename filename_is_safe() to filename_is_valid(), since it
actually does a full validation for what the kernel will accept as file
name, it's not just a heuristic.
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As kdbus no longer exports this, remove all traces from sd-bus too
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On the contrary of env, the added function returns all characters
cescaped, because it improves reproducibility.
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/proc/[pid]/cwd and /proc/[pid]/root are symliks to corresponding
directories
The added functions returns values of that symlinks.
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The asserts used in the tests should never be allowed to be
optimized away
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The alloca_align() helper is the alloca() equivalent of posix_memalign().
As there is no such function provided by glibc, we simply account for
additional memory and return a pointer offset into the allocated memory to
grant the alignment.
Furthermore, alloca0_align() is added, which simply clears the allocated
memory.
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Properly free all temporary resources to make valgrind not complain about
lost records.
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We must free FILE* after function return to not leak resources. Note that
this also closes our fd as fdopen() takes ownership of it.
Reported by Philippe De Swert (via coverity).
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Similar to container_of(), we now use unique variable names for the bascic
math macros MAX, MIN, CLAMP, LESS_BY. Furthermore, unit tests are added to
verify they work as expected.
For a rationale, see:
commit fb835651aff79a1e7fc5795086c9b26e59a8e6ca
Author: David Herrmann <dh.herrmann@gmail.com>
Date: Fri Aug 22 14:41:37 2014 +0200
shared: make container_of() use unique variable names
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If you stack container_of() macros, you will get warnings due to shadowing
variables of the parent context. To avoid this, use unique names for
variables.
Two new helpers are added:
UNIQ: This evaluates to a truly unique value never returned by any
evaluation of this macro. It's a shortcut for __COUNTER__.
UNIQ_T: Takes two arguments and concatenates them. It is a shortcut for
CONCATENATE, but meant to defined typed local variables.
As you usually want to use variables that you just defined, you need to
reference the same unique value at least two times. However, UNIQ returns
a new value on each evaluation, therefore, you have to pass the unique
values into the macro like this:
#define my_macro(a, b) __max_macro(UNIQ, UNIQ, (a), (b))
#define __my_macro(uniqa, uniqb, a, b) ({
typeof(a) UNIQ_T(A, uniqa) = (a);
typeof(b) UNIQ_T(B, uniqb) = (b);
MY_UNSAFE_MACRO(UNIQ_T(A, uniqa), UNIQ_T(B, uniqb));
})
This way, MY_UNSAFE_MACRO() can safely evaluate it's arguments multiple
times as they are local variables. But you can also stack invocations to
the macro my_macro() without clashing names.
This is the same as if you did:
#define my_macro(a, b) __max_macro(__COUNTER__, __COUNTER__, (a), (b))
#define __my_macro(prefixa, prefixb, a, b) ({
typeof(a) CONCATENATE(A, prefixa) = (a);
typeof(b) CONCATENATE(B, prefixb) = (b);
MY_UNSAFE_MACRO(CONCATENATE(A, prefixa), CONCATENATE(B, prefixb));
})
...but in my opinion, the first macro is easier to write and read.
This patch starts by converting container_of() to use this new helper.
Other macros may follow (like MIN, MAX, CLAMP, ...).
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Otherwise it gets optimized out when CPPFLAGS='-DNDEBUG' is used.
Tested:
- make check TESTS='test-util' CPPFLAGS='-DNDEBUG'
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The MAXSIZE() macro takes two types and returns the size of the larger
one. It is much simpler to use than MAX(sizeof(A), sizeof(B)) and also
avoids any compiler-extensions, unlike CONST_MAX() and MAX() (which are
needed to avoid evaluating arguments more than once). This was suggested
by Daniele Nicolodi <daniele@grinta.net>.
Also make resolved use this macro instead of CONST_MAX(). This enhances
readability quite a bit.
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add tests for:
- is_symlink
- pid_is_unwaited
- pid_is_alive
- search_and_fopen
- search_and_fopen_nulstr
- glob_exists
- execute_directory
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The CONST_MAX() macro is similar to MAX(), but verifies that both
arguments have the same type and are constant expressions. Furthermore,
the result of CONST_MAX() is again a constant-expression.
CONST_MAX() avoids any statement-expressions and other non-trivial
expression-types. This avoids rather arbitrary restrictions in both GCC
and LLVM, which both either fail with statement-expressions inside
type-declarations or statement-expressions inside static-const
initializations.
If anybody knows how to circumvent this, please feel free to unify
CONST_MAX() and MAX().
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The "0,5" syntax was actually right. The real problem is, the test should
only run if the local system has the de_DE.UTF-8 locale. Therefore, skip
the tests if setlocale() fails. This is kinda ugly, as it is done
silently, but we cannot skip partial tests with the current
infrastructure. Should be fine this way.
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One strtod() test is broken since:
commit 8e211000025940b770794abf5754de61b4add0af
Author: Thomas Hindoe Paaboel Andersen <phomes@gmail.com>
Date: Mon Aug 4 23:13:31 2014 +0200
test: use fabs on doubles
The commit was right, so no reason to revert it, but the test was broken
before and only worked by coincidence. Convert "0,5" to "0.5" so we don't
depend on locales for double conversion (or well, we depend on "C" which
seems reasonable).
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This makes strappenda3 redundant, so we remove its usage and
definition. Add a few tests along the way for sanity.
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$ systemd-analyze verify trailing-g.service
[./trailing-g.service:2] Trailing garbage, ignoring.
trailing-g.service lacks ExecStart setting. Refusing.
Error: org.freedesktop.systemd1.LoadFailed: Unit trailing-g.service failed to load: Invalid argument.
Failed to create trailing-g.service/start: Invalid argument
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String which ended in an unfinished quote were accepted, potentially
with bad memory accesses.
Reject anything which ends in a unfished quote, or contains
non-whitespace characters right after the closing quote.
_FOREACH_WORD now returns the invalid character in *state. But this return
value is not checked anywhere yet.
Also, make 'word' and 'state' variables const pointers, and rename 'w'
to 'word' in various places. Things are easier to read if the same name
is used consistently.
mbiebl_> am I correct that something like this doesn't work
mbiebl_> ExecStart=/usr/bin/encfs --extpass='/bin/systemd-ask-passwd "Unlock EncFS"'
mbiebl_> systemd seems to strip of the quotes
mbiebl_> systemctl status shows
mbiebl_> ExecStart=/usr/bin/encfs --extpass='/bin/systemd-ask-password Unlock EncFS $RootDir $MountPoint
mbiebl_> which is pretty weird
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Require exact matches in all cases instead of treating strings
starting with 't' ('f') as true (false).
This is required for config_parse_protect_system to parse ProtectSystem=full
correctly: it uses parse_boolean and only tries a more specific parsing
function if that did not return a valid result. Thus "full" was treated as
"false" before.
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Better safe than sorry.
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add tests for:
- filename_is_safe
- ascii_strlower
- files_same
- is_valid_documentation_url
- file_in_same_dir
- endswith
- close_nointr
- unlink_noerrno
- readlink_and_make_absolute
- read_one_char
- ignore_signals
- strshorten
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No functional change expected :)
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Sounds easy, turns out to be horrible to implement: ALIGN_POWER2 returns
the next higher power of 2. clz(0) is undefined, same is true for
left-shift-overflows, yey, C rocks!
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number of fixed strings
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safe_close() automatically becomes a NOP when a negative fd is passed,
and returns -1 unconditionally. This makes it easy to write lines like
this:
fd = safe_close(fd);
Which will close an fd if it is open, and reset the fd variable
correctly.
By making use of this new scheme we can drop a > 200 lines of code that
was required to test for non-negative fds or to reset the closed fd
variable afterwards.
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