1 files changed, 188 insertions, 0 deletions
diff --git a/third_party/rust/nix/test/test_kmod/mod.rs b/third_party/rust/nix/test/test_kmod/mod.rs
new file mode 100644
index 0000000000..6f9aaa897f
--- /dev/null
+++ b/third_party/rust/nix/test/test_kmod/mod.rs
@@ -0,0 +1,188 @@
+use crate::*;
+use std::fs::copy;
+use std::path::PathBuf;
+use std::process::Command;
+use tempfile::{tempdir, TempDir};
+
+fn compile_kernel_module() -> (PathBuf, String, TempDir) {
+    let _m = crate::FORK_MTX.lock();
+
+    let tmp_dir =
+        tempdir().expect("unable to create temporary build directory");
+
+    copy(
+        "test/test_kmod/hello_mod/hello.c",
+        tmp_dir.path().join("hello.c"),
+    )
+    .expect("unable to copy hello.c to temporary build directory");
+    copy(
+        "test/test_kmod/hello_mod/Makefile",
+        tmp_dir.path().join("Makefile"),
+    )
+    .expect("unable to copy Makefile to temporary build directory");
+
+    let status = Command::new("make")
+        .current_dir(tmp_dir.path())
+        .status()
+        .expect("failed to run make");
+
+    assert!(status.success());
+
+    // Return the relative path of the build kernel module
+    (tmp_dir.path().join("hello.ko"), "hello".to_owned(), tmp_dir)
+}
+
+use nix::errno::Errno;
+use nix::kmod::{delete_module, DeleteModuleFlags};
+use nix::kmod::{finit_module, init_module, ModuleInitFlags};
+use std::ffi::CString;
+use std::fs::File;
+use std::io::Read;
+
+#[test]
+fn test_finit_and_delete_module() {
+    require_capability!("test_finit_and_delete_module", CAP_SYS_MODULE);
+    let _m0 = crate::KMOD_MTX.lock();
+    let _m1 = crate::CWD_LOCK.read();
+
+    let (kmod_path, kmod_name, _kmod_dir) = compile_kernel_module();
+
+    let f = File::open(kmod_path).expect("unable to open kernel module");
+    finit_module(&f, &CString::new("").unwrap(), ModuleInitFlags::empty())
+        .expect("unable to load kernel module");
+
+    delete_module(
+        &CString::new(kmod_name).unwrap(),
+        DeleteModuleFlags::empty(),
+    )
+    .expect("unable to unload kernel module");
+}
+
+#[test]
+fn test_finit_and_delete_module_with_params() {
+    require_capability!(
+        "test_finit_and_delete_module_with_params",
+        CAP_SYS_MODULE
+    );
+    let _m0 = crate::KMOD_MTX.lock();
+    let _m1 = crate::CWD_LOCK.read();
+
+    let (kmod_path, kmod_name, _kmod_dir) = compile_kernel_module();
+
+    let f = File::open(kmod_path).expect("unable to open kernel module");
+    finit_module(
+        &f,
+        &CString::new("who=Rust number=2018").unwrap(),
+        ModuleInitFlags::empty(),
+    )
+    .expect("unable to load kernel module");
+
+    delete_module(
+        &CString::new(kmod_name).unwrap(),
+        DeleteModuleFlags::empty(),
+    )
+    .expect("unable to unload kernel module");
+}
+
+#[test]
+fn test_init_and_delete_module() {
+    require_capability!("test_init_and_delete_module", CAP_SYS_MODULE);
+    let _m0 = crate::KMOD_MTX.lock();
+    let _m1 = crate::CWD_LOCK.read();
+
+    let (kmod_path, kmod_name, _kmod_dir) = compile_kernel_module();
+
+    let mut f = File::open(kmod_path).expect("unable to open kernel module");
+    let mut contents: Vec<u8> = Vec::new();
+    f.read_to_end(&mut contents)
+        .expect("unable to read kernel module content to buffer");
+    init_module(&contents, &CString::new("").unwrap())
+        .expect("unable to load kernel module");
+
+    delete_module(
+        &CString::new(kmod_name).unwrap(),
+        DeleteModuleFlags::empty(),
+    )
+    .expect("unable to unload kernel module");
+}
+
+#[test]
+fn test_init_and_delete_module_with_params() {
+    require_capability!(
+        "test_init_and_delete_module_with_params",
+        CAP_SYS_MODULE
+    );
+    let _m0 = crate::KMOD_MTX.lock();
+    let _m1 = crate::CWD_LOCK.read();
+
+    let (kmod_path, kmod_name, _kmod_dir) = compile_kernel_module();
+
+    let mut f = File::open(kmod_path).expect("unable to open kernel module");
+    let mut contents: Vec<u8> = Vec::new();
+    f.read_to_end(&mut contents)
+        .expect("unable to read kernel module content to buffer");
+    init_module(&contents, &CString::new("who=Nix number=2015").unwrap())
+        .expect("unable to load kernel module");
+
+    delete_module(
+        &CString::new(kmod_name).unwrap(),
+        DeleteModuleFlags::empty(),
+    )
+    .expect("unable to unload kernel module");
+}
+
+#[test]
+fn test_finit_module_invalid() {
+    require_capability!("test_finit_module_invalid", CAP_SYS_MODULE);
+    let _m0 = crate::KMOD_MTX.lock();
+    let _m1 = crate::CWD_LOCK.read();
+
+    let kmod_path = "/dev/zero";
+
+    let f = File::open(kmod_path).expect("unable to open kernel module");
+    let result =
+        finit_module(&f, &CString::new("").unwrap(), ModuleInitFlags::empty());
+
+    assert_eq!(result.unwrap_err(), Errno::EINVAL);
+}
+
+#[test]
+fn test_finit_module_twice_and_delete_module() {
+    require_capability!(
+        "test_finit_module_twice_and_delete_module",
+        CAP_SYS_MODULE
+    );
+    let _m0 = crate::KMOD_MTX.lock();
+    let _m1 = crate::CWD_LOCK.read();
+
+    let (kmod_path, kmod_name, _kmod_dir) = compile_kernel_module();
+
+    let f = File::open(kmod_path).expect("unable to open kernel module");
+    finit_module(&f, &CString::new("").unwrap(), ModuleInitFlags::empty())
+        .expect("unable to load kernel module");
+
+    let result =
+        finit_module(&f, &CString::new("").unwrap(), ModuleInitFlags::empty());
+
+    assert_eq!(result.unwrap_err(), Errno::EEXIST);
+
+    delete_module(
+        &CString::new(kmod_name).unwrap(),
+        DeleteModuleFlags::empty(),
+    )
+    .expect("unable to unload kernel module");
+}
+
+#[test]
+fn test_delete_module_not_loaded() {
+    require_capability!("test_delete_module_not_loaded", CAP_SYS_MODULE);
+    let _m0 = crate::KMOD_MTX.lock();
+    let _m1 = crate::CWD_LOCK.read();
+
+    let result = delete_module(
+        &CString::new("hello").unwrap(),
+        DeleteModuleFlags::empty(),
+    );
+
+    assert_eq!(result.unwrap_err(), Errno::ENOENT);
+}