From 8bc6a711fbbad02abcf98f441330be19627ce3a0 Mon Sep 17 00:00:00 2001
From: Leah Neukirchen <leah@vuxu.org>
Date: Fri, 14 Jul 2017 19:39:25 +0200
Subject: initial commit of fail

---
 fail.c | 116 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 116 insertions(+)
 create mode 100644 fail.c

(limited to 'fail.c')

diff --git a/fail.c b/fail.c
new file mode 100644
index 0000000..36896c5
--- /dev/null
+++ b/fail.c
@@ -0,0 +1,116 @@
+/* fail - crash in various possible ways */
+
+#include <linux/seccomp.h>
+
+#include <sys/prctl.h>
+#include <sys/ptrace.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#include <fcntl.h>
+#include <signal.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+void
+segfault() {
+	volatile int *nullp = 0;
+
+	*nullp = 42;
+}
+
+// can lockup your machine
+void
+oom() {
+	long c = 0;
+	static long last = 0;
+
+	int fd;
+	fd = open("/proc/self/oom_score_adj", O_WRONLY);
+	write(fd, "1000\n", 5);
+	close(fd);
+
+	while (1) {
+		long *m = malloc(4096*4096);
+		m[0] = last;
+		m[1] = c++;
+		last = (long)m;
+		write(1, ".", 1);
+	}
+}
+
+void
+recurse(char *n) {
+	char m[1024];
+	recurse(m);
+	if (n)
+		m[0] = n[0] = 42;
+}
+
+void
+abortme() {
+	abort();
+}
+
+void
+killme() {
+	raise(SIGKILL);
+}
+
+void illegalins() {
+#if defined(__x86_64__) || defined(__i386__)
+        __asm__ __volatile__( "ud1" : : : "memory" );
+#elif defined(__arm__)
+        __asm__ __volatile__(
+	#ifndef __thumb__
+		".word 0xe7f000f0"
+	#else
+		".short 0xdeff"
+	#endif
+                : : : "memory");
+#elif defined(__aarch64__)
+	__asm__ __volatile__( ".word 0x00800011" : : : "memory" );
+#else
+	#error implement illegalins for this architecture
+#endif
+}
+
+void trap() {
+	__builtin_trap();
+}
+
+int zero = 0;
+void divtrap() {
+	zero = 1/zero;
+}
+
+void
+violate_seccomp() {
+	prctl(PR_SET_SECCOMP, SECCOMP_MODE_STRICT);
+	chdir("/");
+}
+
+int
+main(int argc, char *argv[]) {
+	int c;
+
+	while ((c = getopt(argc, argv, "123Oacdikrst")) != -1) {
+        	switch (c) {
+		case '1': exit(-1); break;
+		case '2': exit(2); break;
+		case '3': exit(111); break;
+                case 'c': violate_seccomp(); break;
+		case 'd': divtrap(); break;
+		case 'i': illegalins(); break;
+		case 't': trap(); break;
+                case 'O': oom(); break;
+                case 'a': abortme(); break;
+                case 'k': killme(); break;
+                case 'r': recurse(0); break;
+                case 's': segfault(); break;                
+		}
+        }
+
+	write(2, "Usage: fail [-123Oacdikrst]", 8);
+	exit(1);
+}
-- 
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