add content/2020-06-23-rust-static-pie.md

content/2020-06-23-rust-static-pie.md

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++++
+title = "Rust - Static PIE and ASLR for the x86_64-unknown-linux-musl Target"
+date = 2020-06-23
+[taxonomies]
+tags = ["rust", "musl"]
+categories = ["programming"]
++++
+
+With current rust nightly the default binary output of the `x86_64-unknown-linux-musl` target is a
+static position independent executable (static-pie)
+with address space layout randomization (ASLR) on execution.
+
+<!-- more -->
+
+hello.rs:
+```rust
+fn main() {
+    println!("main = {:#x}", &main as *const _ as usize);
+}
+```
+
+Current stable rust 1.44.1 produces the usual static elf binary:
+```console
+$ rustc --version
+  rustc 1.44.1 (c7087fe00 2020-06-17)
+
+$ rustc --target x86_64-unknown-linux-musl hello.rs
+
+$ file hello
+hello: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), statically linked, BuildID[sha1]=3f44a4c3315d4c7c94c64b332a3fb3e604a7c066, with debug_info, not stripped
+
+$ ./hello
+main = 0x43b008
+
+$ ./hello
+main = 0x43b008
+```
+
+Current nightly rust 1.46.0 produces a static-pie with ASLR:
+```console
+$ rustc +nightly --version
+rustc 1.46.0-nightly (6bb3dbfc6 2020-06-22)
+
+$ rustc +nightly --target x86_64-unknown-linux-musl hello.rs
+
+$ file hello
+hello: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), statically linked, BuildID[sha1]=9592de3bfd3e9b71296edb494f1eac23958a4c59, with debug_info, not stripped
+
+$ ./hello
+main = 0x7f7310574008
+
+$ ./hello
+main = 0x7fb552b0c008
+```