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63747c9477Add tracepoints for Landlock rule addition, landlock_add_rule_fs for filesystem rules and landlock_add_rule_net for network rules, so trace consumers can correlate filesystem objects and network ports with their rulesets. Both are emitted under the ruleset lock (asserted in TP_fast_assign) so an eBPF program reads the ruleset, including the rule just inserted, in a consistent snapshot. Add a version field to struct landlock_ruleset, gated on CONFIG_TRACEPOINTS like the id field and incremented under the ruleset lock on each successful landlock_add_rule(2), including when it only extends an existing rule's access rights. It fills the existing 4-byte hole after usage, so the struct does not grow. Pairing the ruleset ID with the version lets a later restrict_self event record the exact ruleset revision merged into a domain. Resolve the filesystem rule's absolute path with d_absolute_path() rather than the d_path() audit uses: d_absolute_path() produces namespace-independent paths that do not depend on the tracer's chroot state, making trace output deterministic regardless of mount namespace configuration. Distinguish the error cases as "<too_long>" (-ENAMETOOLONG) and "<unreachable>" (anonymous files or detached mounts). Also add __trace_print_untrusted_str(), a static inline helper in the header guarded by CREATE_TRACE_POINTS: it escapes separators, quotes, backslashes, and non-printable bytes via string_escape_mem() so an untrusted string (the path here, process names in later denial events) cannot inject field separators or control characters into the ftrace text output. Cc: Christian Brauner <brauner@kernel.org> Cc: Günther Noack <gnoack@google.com> Cc: Justin Suess <utilityemal77@gmail.com> Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Tingmao Wang <m@maowtm.org> Link: https://patch.msgid.link/20260811094338.288094-9-mic@digikod.net Signed-off-by: Mickaël Salaün <mic@digikod.net>
354 lines
9.2 KiB
354 lines
9.2 KiB