From Cppcheck:
Passing NULL after the last typed argument to a variadic function leads to
undefined behaviour. The C99 standard, in section 7.15.1.1, states that if the
type used by va_arg() is not compatible with the type of the actual next
argument (as promoted according to the default argument promotions), the
behavior is undefined. The value of the NULL macro is an implementation-defined
null pointer constant (7.17), which can be any integer constant expression with
the value 0, or such an expression casted to (void*) (6.3.2.3). This includes
values like 0, 0L, or even 0LL.In practice on common architectures, this will
cause real crashes if sizeof(int) != sizeof(void*), and NULL is defined to 0 or
any other null pointer constant that promotes to int. To reproduce you might be
able to use this little code example on 64bit platforms. If the output includes
"ERROR", the sentinel had only 4 out of 8 bytes initialized to zero and was not
detected as the final argument to stop argument processing via
va_arg(). Changing the 0 to (void*)0 or 0L will make the "ERROR" output go away.
void f(char *s, ...) {
va_list ap;
va_start(ap,s);
for (;;) {
char *p = va_arg(ap,char*);
printf("%018p, %s\n", p, (long)p & 255 ? p : "");
if(!p) break;
}
va_end(ap);
}
void g() {
char *s2 = "x";
char *s3 = "ERROR";
// changing 0 to 0L for the 7th argument (which is intended to act as
// sentinel) makes the error go away on x86_64
f("first", s2, s2, s2, s2, s2, 0, s3, (char*)0);
}
void h() {
int i;
volatile unsigned char a[1000];
for (i = 0; i<sizeof(a); i++)
a[i] = -1;
}
int main() {
h();
g();
return 0;
}
(cherry picked from commit d8879af877)
This MR changes the default Debian sid build to wrap make with bear
that creates compilation database and use the compilation database
to run Cppcheck on the source files systematically.
The job is currently set to be allowed to fail as it will take some
time to fix all the Cppcheck detected issues.
(cherry picked from commit f55dc51f42)
The libidn2 library on Ubuntu Bionic is broken and idn2_to_unicode_8zlz() does't
fail when it should. This commit ensures that we don't run the system test for
valid A-label in locale that cannot display with the buggy libidn2 as it would
break the tests.
(cherry picked from commit c42e3583f9)
It is possible dig used ACE encoded name in locale, which does not
support converting it to unicode. Instead of fatal error, fallback to
ACE name on output.
(cherry picked from commit c8a871e908)
Bring the files describing Windows-specific aspects of building and
installing BIND up to date. Remove the parts which are either outdated
(e.g. 32-bit build instructions), already included elsewhere (e.g. the
list of Windows systems BIND is known to run on), or inconvenient to
keep up to date in the long run (e.g. ARM chapter numbers).
(cherry picked from commit 646fcb733e)
Ensure BIND can be tested on Windows in GitLab to more quickly catch
build and test errors on that operating system.
Some notes:
- While build jobs are triggered for all pipelines, system test jobs
are not - due to the time it takes to run the complete system test
suite on Windows (about 20 minutes), the latter are only run for
pipelines created through GitLab's web interface and for pipelines
created for Git tags.
- Only the "Release" build configuration is currently used. Adding
"Debug" builds is a matter of extending .gitlab-ci.yml, but it was
not done for the time being due to questionable usefulness of
performing such builds in GitLab CI.
- Only a 64-bit build is performed. Adding support for 32-bit builds
is not planned to be implemented.
- Unit tests are still not run on Windows, but adding support for that
is on the roadmap.
- All Windows GitLab CI jobs are run inside Windows Server containers,
using the Custom executor feature of GitLab Runner as Windows Server
2016 is not supported by GitLab Runner's native Docker on Windows
executor and Windows Server 2019 is not yet widely available from
hosting providers.
- The Windows Docker image used by GitLab CI is not stored in the
GitLab Container Registry as it is over 27 GB in size and thus
passing it between GitLab and its runners is impractical.
- There is no vcvarsall.bat variant written in PowerShell and batch
scripts are no longer supported by GitLab Runner Custom executor, so
the environment variables set by vcvarsall.bat are injected back
into the PowerShell environment by processing the output of "set".
- Visual Studio parallel builds are a bit different than "make -jX"
builds as parallelization happens in two tiers: project parallelism
(controlled by the "/maxCpuCount" msbuild.exe switch) and compiler
parallelism (controlled by the "/MP" cl.exe switch). To limit the
total number of compiler processes spawned concurrently to a value
similar to the one used for Unix builds, msbuild.exe is allowed to
build at most 2 projects at once, each of which can spawn up to half
of BUILD_PARALLEL_JOBS worth of compiler processes. Using such
parameters is a fairly arbitrary decision taken to solve the
trade-off between compilation speed and runner load.
- Configuring network addresses in Windows Server containers is
tricky. Adding 10.53.0.1/24 and similar addresses to the vEthernet
interface created by Docker never causes ifconfig.bat to fail, but
in fact only one container can have any given IP address configured
at any given time (the request to add the same address in another
container is silently ignored). Thus, in order to allow multiple
system test jobs to be run in parallel, the addresses used in system
tests are configured on the loopback interfaces. Interestingly
enough, the addresses set on the loopback interfaces... persist
between containers. Fortunately, this is acceptable for the time
being and only requires ifconfig.bat failures to be ignored (as
ifconfig.bat will fail if it attempts to configure an already
existing address on an interface). We also need to wait for a brief
moment after calling ifconfig.bat as the addresses the latter
attempts to configure may not be immediately available after it
returns (and that causes runall.sh to error out). Finally, for some
reason we also need to signal that the DNS servers on each loopback
interface are to be configured using DHCP or else ifconfig.bat will
fail to add the requested addresses.
- Since named.pid files created by named instances used in system
tests contain Windows PIDs instead of Cygwin PIDs and various
versions of Cygwin "kill" react differently when passed Windows PIDs
without the -W switch, all "kill" invocations in GitLab CI need to
use that switch (otherwise they would print error messages which
would cause stop.pl to assume the process being killed died
prematurely). However, to preserve compatibility with older Cygwin
versions used in our other Windows test environments, we alter the
relevant scripts "on the fly" rather than in the Git repository.
- In the containers used for running system tests, Windows Error
Reporting is configured to automatically create crash dumps in
C:\CrashDumps. This directory is examined after the test suite is
run to ensure no crashes went under stop.pl's radar.
(cherry picked from commit ca36405a3d)
