Add !!Con 2021 content

content/pages/bangbangcon2021/demo/.gitignore

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+/target

content/pages/bangbangcon2021/demo/.vim/coc-settings.json

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+{
+  "suggest.floatEnable": false,
+  "signature.enable": false,
+  "suggest.enablePreview": false,
+  "suggest.autoTrigger": "none",
+}

content/pages/bangbangcon2021/demo/Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "aho-corasick"
+version = "0.7.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e37cfd5e7657ada45f742d6e99ca5788580b5c529dc78faf11ece6dc702656f"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "cfg-if"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
+
+[[package]]
+name = "demo"
+version = "0.1.0"
+dependencies = [
+ "libc",
+ "owoify",
+]
+
+[[package]]
+name = "getrandom"
+version = "0.1.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8fc3cb4d91f53b50155bdcfd23f6a4c39ae1969c2ae85982b135750cccaf5fce"
+dependencies = [
+ "cfg-if",
+ "libc",
+ "wasi",
+]
+
+[[package]]
+name = "libc"
+version = "0.2.94"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "18794a8ad5b29321f790b55d93dfba91e125cb1a9edbd4f8e3150acc771c1a5e"
+
+[[package]]
+name = "memchr"
+version = "2.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b16bd47d9e329435e309c58469fe0791c2d0d1ba96ec0954152a5ae2b04387dc"
+
+[[package]]
+name = "owoify"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f5d5373685d13f2b6080231760ae4e1ca37161f129e1eb2393ea9028ffa49339"
+dependencies = [
+ "rand",
+ "regex",
+]
+
+[[package]]
+name = "ppv-lite86"
+version = "0.2.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac74c624d6b2d21f425f752262f42188365d7b8ff1aff74c82e45136510a4857"
+
+[[package]]
+name = "rand"
+version = "0.7.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6a6b1679d49b24bbfe0c803429aa1874472f50d9b363131f0e89fc356b544d03"
+dependencies = [
+ "getrandom",
+ "libc",
+ "rand_chacha",
+ "rand_core",
+ "rand_hc",
+]
+
+[[package]]
+name = "rand_chacha"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f4c8ed856279c9737206bf725bf36935d8666ead7aa69b52be55af369d193402"
+dependencies = [
+ "ppv-lite86",
+ "rand_core",
+]
+
+[[package]]
+name = "rand_core"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "90bde5296fc891b0cef12a6d03ddccc162ce7b2aff54160af9338f8d40df6d19"
+dependencies = [
+ "getrandom",
+]
+
+[[package]]
+name = "rand_hc"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ca3129af7b92a17112d59ad498c6f81eaf463253766b90396d39ea7a39d6613c"
+dependencies = [
+ "rand_core",
+]
+
+[[package]]
+name = "regex"
+version = "1.5.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ce5f1ceb7f74abbce32601642fcf8e8508a8a8991e0621c7d750295b9095702b"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-syntax"
+version = "0.6.25"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f497285884f3fcff424ffc933e56d7cbca511def0c9831a7f9b5f6153e3cc89b"
+
+[[package]]
+name = "wasi"
+version = "0.9.0+wasi-snapshot-preview1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cccddf32554fecc6acb585f82a32a72e28b48f8c4c1883ddfeeeaa96f7d8e519"

content/pages/bangbangcon2021/demo/Cargo.toml

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+[package]
+name = "demo"
+version = "0.1.0"
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+libc = "0.2.94"
+owoify = "0.1.5"
+
+[profile.dev]
+opt-level = 3
+debug = true

content/pages/bangbangcon2021/demo/src/main.rs

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+use crate::things::*;
+use libc::*;
+use std::{mem, slice, str};
+mod things;
+
+use owoify::OwOifiable;
+static mut REAL_WRITE: Option<LibcWrite> = None;
+
+unsafe extern "C" fn write_owo(fd: i32, ptr: *const c_void, len: usize) -> isize {
+    let s = slice::from_raw_parts(ptr as *const _, len);
+    let s = str::from_utf8(s).unwrap();
+    let owoified = s.to_string().owoify();
+
+    REAL_WRITE.unwrap()(fd, owoified.as_ptr() as *const _, owoified.len());
+    len as isize
+}
+
+fn main() {
+    let addr = get_hex_from_cmdline();
+    let addr = (addr + 0x555555554000) as *mut usize;
+
+    unsafe {
+        REAL_WRITE = Some(mem::transmute(*addr));
+        mprotect(
+            (addr as usize & !(0x1000 - 1)) as *mut _,
+            0x1000,
+            PROT_READ | PROT_WRITE,
+        );
+        *addr = write_owo as usize;
+    }
+    let s = "hello !!con!!\n";
+    unsafe { write(1, s.as_ptr() as *const _, s.len()) };
+
+    println!("hello !!con!! from println");
+}

content/pages/bangbangcon2021/demo/src/things.rs

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+pub type LibcWrite = unsafe extern "C" fn(fd: i32, ptr: *const libc::c_void, len: usize) -> isize;
+pub fn get_hex_from_cmdline() -> usize {
+    usize::from_str_radix(&std::env::args().skip(1).next().unwrap(), 16).unwrap()
+}