rust: replace lsm context+len with lsm_context

This brings the Rust SecurityCtx abstraction [1] up to date with the new
API where context+len is replaced with an lsm_context [2] struct.

Link: https

rust: replace lsm context+len with lsm_context

This brings the Rust SecurityCtx abstraction [1] up to date with the new
API where context+len is replaced with an lsm_context [2] struct.

Link: https://lore.kernel.org/r/[email protected] [1]
Link: https://lore.kernel.org/r/[email protected] [2]
Reported-by: Linux Kernel Functional Testing <[email protected]>
Closes: https://lore.kernel.org/r/CA+G9fYv_Y2tzs+uYhMGtfUK9dSYV2mFr6WyKEzJazDsdk9o5zw@mail.gmail.com
Signed-off-by: Alice Ryhl <[email protected]>
[PM: subj line tweak]
Signed-off-by: Paul Moore <[email protected]>

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rust: security: add abstraction for secctx

Add an abstraction for viewing the string representation of a security
context.

This is needed by Rust Binder because it has a feature where a process
can

rust: security: add abstraction for secctx

Add an abstraction for viewing the string representation of a security
context.

This is needed by Rust Binder because it has a feature where a process
can view the string representation of the security context for incoming
transactions. The process can use that to authenticate incoming
transactions, and since the feature is provided by the kernel, the
process can trust that the security context is legitimate.

This abstraction makes the following assumptions about the C side:
* When a call to `security_secid_to_secctx` is successful, it returns a
pointer and length. The pointer references a byte string and is valid
for reading for that many bytes.
* The string may be referenced until `security_release_secctx` is
called.
* If CONFIG_SECURITY is set, then the three methods mentioned in
rust/helpers are available without a helper. (That is, they are not a
#define or `static inline`.)

Reviewed-by: Benno Lossin <[email protected]>
Reviewed-by: Martin Rodriguez Reboredo <[email protected]>
Reviewed-by: Trevor Gross <[email protected]>
Reviewed-by: Gary Guo <[email protected]>
Signed-off-by: Alice Ryhl <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Acked-by: Paul Moore <[email protected]>
Reviewed-by: Kees Cook <[email protected]>
Signed-off-by: Christian Brauner <[email protected]>

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