include: Suppress coredumpctl entries for teststestingbe

With DISABLE_TESTS_CORE_DUMPS, setrlimit(RLIMIT_CORE, 0) only prevents
core dump files from being written, but when systemd-coredump is
configured as a piped handler (via core_pattern), the kernel still
invokes it regardless of RLIMIT_CORE, so entries appear in
coredumpctl. Adding prctl(PR_SET_DUMPABLE, 0) marks the process as
non-dumpable, which prevents the kernel from invoking the core dump
handler entirely — including piped ones.

Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks>
Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>

1 files changed, 6 insertions, 0 deletions

diff --git a/include/test/test.h b/include/test/test.h
index 99681384..a76fe62a 100644
--- a/include/test/test.h
+++ b/include/test/test.h
@@ -30,6 +30,9 @@
 #include <sys/wait.h>
 #include <sys/types.h>
 #include <sys/resource.h>
+#ifdef __linux__
+#include <sys/prctl.h>
+#endif
 
 #define TEST_RC_SUCCESS  0
 #define TEST_RC_SKIP     1
@@ -86,6 +89,9 @@ static int __attribute__((unused)) test_assert_fail(int(* testfunc)(void))
 #ifdef DISABLE_TESTS_CORE_DUMPS
                 struct rlimit rl = { .rlim_cur = 0, .rlim_max = 0 };
                 setrlimit(RLIMIT_CORE, &rl);
+#ifdef __linux__
+                prctl(PR_SET_DUMPABLE, 0);
+#endif
 #endif
                 return testfunc(); /* should abort */
         }