linux/rust/helpers/cred.c

// SPDX-License-Identifier: GPL-2.0

#include <linux/cred.h>

const struct cred *rust_helper_get_cred(const struct cred *cred)
{
	return get_cred(cred);
}

void rust_helper_put_cred(const struct cred *cred)
{
	put_cred(cred);
}
rust: cred: add Rust abstraction for `struct cred` Add a wrapper around `struct cred` called `Credential`, and provide functionality to get the `Credential` associated with a `File`. Rust Binder must check the credentials of processes when they attempt to perform various operations, and these checks usually take a `&Credential` as parameter. The security_binder_set_context_mgr function would be one example. This patch is necessary to access these security_* methods from Rust. This Rust abstraction makes the following assumptions about the C side: * `struct cred` is refcounted with `get_cred`/`put_cred`. * It's okay to transfer a `struct cred` across threads, that is, you do not need to call `put_cred` on the same thread as where you called `get_cred`. * The `euid` field of a `struct cred` never changes after initialization. * The `f_cred` field of a `struct file` never changes after initialization. Signed-off-by: Wedson Almeida Filho <wedsonaf@gmail.com> Co-developed-by: Alice Ryhl <aliceryhl@google.com> Reviewed-by: Trevor Gross <tmgross@umich.edu> Reviewed-by: Benno Lossin <benno.lossin@proton.me> Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@gmail.com> Reviewed-by: Gary Guo <gary@garyguo.net> Signed-off-by: Alice Ryhl <aliceryhl@google.com> Link: https://lore.kernel.org/r/20240915-alice-file-v10-4-88484f7a3dcf@google.com Reviewed-by: Kees Cook <kees@kernel.org> Reviewed-by: Paul Moore <paul@paul-moore.com> Signed-off-by: Christian Brauner <brauner@kernel.org> 2024-09-15 14:31:30 +00:00			`// SPDX-License-Identifier: GPL-2.0`

			`#include <linux/cred.h>`

			`const struct cred rust_helper_get_cred(const struct cred cred)`
			`{`
			`return get_cred(cred);`
			`}`

			`void rust_helper_put_cred(const struct cred *cred)`
			`{`
			`put_cred(cred);`
			`}`