migrate all

userland/linux/ctrl_alt_del.c

@@ -0,0 +1,26 @@
+/* https://github.com/cirosantilli/linux-kernel-module-cheat#ctrl-alt-del */
+
+#define _XOPEN_SOURCE 700
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/reboot.h>
+#include <unistd.h>
+
+void signal_handler(int sig) {
+    write(STDOUT_FILENO, "cad\n", 4);
+    signal(sig, signal_handler);
+}
+
+int main(void) {
+    int i = 0;
+    /* Disable the forced reboot, enable sending SIGINT to init. */
+    reboot(RB_DISABLE_CAD);
+    signal(SIGINT, signal_handler);
+    while (1) {
+        sleep(1);
+        printf("%d\n", i);
+        i++;
+    }
+    return EXIT_SUCCESS;
+}

userland/linux/poweroff.c

@@ -0,0 +1,9 @@
+/* https://github.com/cirosantilli/linux-kernel-module-cheat#poweroff-out */
+
+#define _XOPEN_SOURCE 700
+#include <sys/reboot.h>
+#include <unistd.h>
+
+int main(void) {
+	reboot(RB_POWER_OFF);
+}

userland/linux/rand_check.c

@@ -0,0 +1,41 @@
+/* https://github.com/cirosantilli/linux-kernel-module-cheat#rand_check-out */
+
+#include <inttypes.h>
+#include <signal.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <time.h>
+#include <unistd.h>
+
+int bss = 0;
+int data = 1;
+
+int main(__attribute__((unused)) int argc, char **argv) {
+	int i, *ip;
+	uint64_t uint64;
+	FILE *fp;
+
+	/* Loaded addresses. */
+	printf("&i         = %p\n", (void *)&i);
+	printf("&argv[0]   = %p\n", (void *)&argv[0]);
+	printf("&main      = %p\n", (void *)(intptr_t)main);
+	printf("&bss       = %p\n", (void *)&bss);
+	printf("&data      = %p\n", (void *)&data);
+
+	/* Misc syscalls. */
+	printf("time(NULL) = %ju\n", (uintmax_t)time(NULL));
+	printf("pid = %ju\n", (uintmax_t)getpid());
+
+	/* malloc */
+	ip = malloc(sizeof(*ip));
+	printf("&malloc    = %p\n", (void *)ip);
+	free(ip);
+
+	/* /dev/urandom */
+	fp = fopen("/dev/urandom", "rb");
+	fread(&uint64, sizeof(uint64), 1, fp);
+	printf("/dev/urandom = %" PRIx64 "\n", uint64);
+	fclose(fp);
+}

userland/linux/time_boot.c

@@ -0,0 +1,14 @@
+/* https://github.com/cirosantilli/linux-kernel-module-cheat#time_boot-out */
+
+#define _XOPEN_SOURCE 700
+#include <stdio.h>
+#include <unistd.h>
+
+int main(void) {
+    FILE *fp;
+    fp = fopen("/dev/kmsg", "w");
+    fputs(__FILE__ "\n", fp);
+    fclose(fp);
+    while (1)
+        sleep(0xFFFFFFFF);
+}