Add SAFE_PRCTL macro

Link: https://lore.kernel.org/ltp/20240711-landlock-v3-4-c7b0e9edf9b0@suse.com/
Reviewed-by: Li Wang <liwang@redhat.com>
Reviewed-by: Petr Vorel <pvorel@suse.cz>
Signed-off-by: Andrea Cervesato <andrea.cervesato@suse.com>

include/tst_safe_macros.h

@@ -503,4 +503,10 @@ int safe_sscanf(const char *file, const int lineno, const char *restrict buffer,
 #define SAFE_SSCANF(buffer, format, ...) \
 	safe_sscanf(__FILE__, __LINE__, (buffer), (format),	##__VA_ARGS__)
 
+int safe_prctl(const char *file, const int lineno,
+	int option, unsigned long arg2, unsigned long arg3,
+	unsigned long arg4, unsigned long arg5);
+#define SAFE_PRCTL(option, arg2, arg3, arg4, arg5) \
+	safe_prctl(__FILE__, __LINE__, (option), (arg2), (arg3), (arg4), (arg5))
+
 #endif /* TST_SAFE_MACROS_H__ */

lib/tst_safe_macros.c

@@ -10,6 +10,7 @@
 #include <errno.h>
 #include <sched.h>
 #include <sys/ptrace.h>
+#include <sys/prctl.h>
 #include "config.h"
 #ifdef HAVE_SYS_FANOTIFY_H
 # include <sys/fanotify.h>
@@ -710,3 +711,19 @@ int safe_mprotect(const char *file, const int lineno,
 
 	return rval;
 }
+
+int safe_prctl(const char *file, const int lineno,
+	int option, unsigned long arg2, unsigned long arg3,
+	unsigned long arg4, unsigned long arg5)
+{
+	int rval;
+
+	rval = prctl(option, arg2, arg3, arg4, arg5);
+	if (rval == -1) {
+		tst_brk_(file, lineno, TBROK | TERRNO,
+			"prctl(%d, %lu, %lu, %lu, %lu)",
+			option, arg2, arg3, arg4, arg5);
+	}
+
+	return rval;
+}