From 76bae02bcd7d6b3ec9eea428e5e95da184a8dbfb Mon Sep 17 00:00:00 2001
From: Rasmus Dahlberg <rasmus@rgdd.se>
Date: Tue, 15 Oct 2024 15:35:20 +0200
Subject: Rescue some slides from old private mono repos

---
 slides/2018-software-security/demo/cmd_complex | 17 ++++++++++++++++
 slides/2018-software-security/demo/cmd_simple  | 28 ++++++++++++++++++++++++++
 slides/2018-software-security/demo/complex.c   | 13 ++++++++++++
 slides/2018-software-security/demo/simple.c    | 22 ++++++++++++++++++++
 4 files changed, 80 insertions(+)
 create mode 100644 slides/2018-software-security/demo/cmd_complex
 create mode 100644 slides/2018-software-security/demo/cmd_simple
 create mode 100644 slides/2018-software-security/demo/complex.c
 create mode 100644 slides/2018-software-security/demo/simple.c

(limited to 'slides/2018-software-security/demo')

diff --git a/slides/2018-software-security/demo/cmd_complex b/slides/2018-software-security/demo/cmd_complex
new file mode 100644
index 0000000..b8bc8e4
--- /dev/null
+++ b/slides/2018-software-security/demo/cmd_complex
@@ -0,0 +1,17 @@
+# compile
+gcc -Wall -Werror -std=c99 -ggdb -fno-stack-protector -m32 -o complex complex.c
+
+# want
+ptr to "/bin/bash"          <-- will becomes system's first args
+dummy RA                    <-- will becomes sytem's RA
+ptr to system               <-- RA
+...
+
+# find /bin/bash
+x/500s $rsp
+
+# find system
+p system
+
+# run with args
+run `python -c 'print "some stuff"'`
diff --git a/slides/2018-software-security/demo/cmd_simple b/slides/2018-software-security/demo/cmd_simple
new file mode 100644
index 0000000..266535e
--- /dev/null
+++ b/slides/2018-software-security/demo/cmd_simple
@@ -0,0 +1,28 @@
+# compile
+gcc -std=c99 -fno-stack-protector -Wno-deprecated-declarations -ggdb -o simple simple.c
+
+# run
+gdb ./simple
+
+# demo commands
+list main
+list greeter
+list fun
+
+disassemble main
+disassemble greeter
+disassemble fun
+
+info register
+
+b main
+b greeter
+b fun
+
+run
+
+# show
+- return address / register values
+- 11a -> "8a"
+- segfault
+- jump fun
diff --git a/slides/2018-software-security/demo/complex.c b/slides/2018-software-security/demo/complex.c
new file mode 100644
index 0000000..ae91ac6
--- /dev/null
+++ b/slides/2018-software-security/demo/complex.c
@@ -0,0 +1,13 @@
+#include <stdio.h>
+#include <string.h>
+
+void f(char *b) {
+	char buf[8];
+	strcpy(buf, b);
+	printf("buf: %s\n", buf);
+}
+
+int main(int argc, char *argv[]) {
+	f(argv[1]);
+	return 0;
+}
diff --git a/slides/2018-software-security/demo/simple.c b/slides/2018-software-security/demo/simple.c
new file mode 100644
index 0000000..cd07c07
--- /dev/null
+++ b/slides/2018-software-security/demo/simple.c
@@ -0,0 +1,22 @@
+#include <stdio.h>
+#include <stdbool.h>
+#include <stdlib.h>
+
+void fun() {
+	printf("fun times!\n");
+}
+
+void mul(int first) {
+	int second = 0;
+	char buf[8] = {1,2,3,4,5,6,7,8};
+	printf("Enter a number: ");
+	gets(buf);
+	second = atoi(buf);
+	printf("%d*%d = %d\n", first, second, first*second);
+}
+
+int main() {
+	int first = 2;
+	mul(first);
+	return 0;
+}
-- 
cgit v1.2.3