Merge tag 'landlock-6.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/mic/linux

Pull landlock updates from Mickaël Salaün:
 "We can now scope a Landlock domain thanks to a new "scoped" field that
  can deny interactions with resources outside of this domain.

  The LANDLOCK_SCOPE_ABSTRACT_UNIX_SOCKET flag denies connections to an
  abstract UNIX socket created outside of the current scoped domain, and
  the LANDLOCK_SCOPE_SIGNAL flag denies sending a signal to processes
  outside of the current scoped domain.

  These restrictions also apply to nested domains according to their
  scope. The related changes will also be useful to support other kind
  of IPC isolations"

* tag 'landlock-6.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/mic/linux:
  landlock: Document LANDLOCK_SCOPE_SIGNAL
  samples/landlock: Add support for signal scoping
  selftests/landlock: Test signal created by out-of-bound message
  selftests/landlock: Test signal scoping for threads
  selftests/landlock: Test signal scoping
  landlock: Add signal scoping
  landlock: Document LANDLOCK_SCOPE_ABSTRACT_UNIX_SOCKET
  samples/landlock: Add support for abstract UNIX socket scoping
  selftests/landlock: Test inherited restriction of abstract UNIX socket
  selftests/landlock: Test connected and unconnected datagram UNIX socket
  selftests/landlock: Test UNIX sockets with any address formats
  selftests/landlock: Test abstract UNIX socket scoping
  selftests/landlock: Test handling of unknown scope
  landlock: Add abstract UNIX socket scoping

1 files changed, 30 insertions, 0 deletions

diff --git a/include/uapi/linux/landlock.h b/include/uapi/linux/landlock.h
index 2c8dbc74b955..33745642f787 100644
--- a/include/uapi/linux/landlock.h
+++ b/include/uapi/linux/landlock.h
@@ -44,6 +44,12 @@ struct landlock_ruleset_attr {
 	 * flags`_).
 	 */
 	__u64 handled_access_net;
+	/**
+	 * @scoped: Bitmask of scopes (cf. `Scope flags`_)
+	 * restricting a Landlock domain from accessing outside
+	 * resources (e.g. IPCs).
+	 */
+	__u64 scoped;
 };
 
 /*
@@ -274,4 +280,28 @@ struct landlock_net_port_attr {
 #define LANDLOCK_ACCESS_NET_BIND_TCP			(1ULL << 0)
 #define LANDLOCK_ACCESS_NET_CONNECT_TCP			(1ULL << 1)
 /* clang-format on */
+
+/**
+ * DOC: scope
+ *
+ * Scope flags
+ * ~~~~~~~~~~~
+ *
+ * These flags enable to isolate a sandboxed process from a set of IPC actions.
+ * Setting a flag for a ruleset will isolate the Landlock domain to forbid
+ * connections to resources outside the domain.
+ *
+ * Scopes:
+ *
+ * - %LANDLOCK_SCOPE_ABSTRACT_UNIX_SOCKET: Restrict a sandboxed process from
+ *   connecting to an abstract UNIX socket created by a process outside the
+ *   related Landlock domain (e.g. a parent domain or a non-sandboxed process).
+ * - %LANDLOCK_SCOPE_SIGNAL: Restrict a sandboxed process from sending a signal
+ *   to another process outside the domain.
+ */
+/* clang-format off */
+#define LANDLOCK_SCOPE_ABSTRACT_UNIX_SOCKET		(1ULL << 0)
+#define LANDLOCK_SCOPE_SIGNAL		                (1ULL << 1)
+/* clang-format on*/
+
 #endif /* _UAPI_LINUX_LANDLOCK_H */