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3f1f106e4c
Merge landlock_find_rule() into landlock_unmask_layers() so rule pointers stay inside the domain implementation while unmask checking gets the matched rule it needs for the check_rule tracepoint. landlock_unmask_layers() now takes a landlock_id and the domain instead of a rule pointer. A rename or link evaluates the same dentry against both renamed parents, so this path now looks the rule up once per parent; collapsing that back to a single lookup is left to a follow-up. Emit, via the per-type wrappers unmask_layers_fs() and unmask_layers_net(), the rights each matching rule grants at every domain layer. The events carry this as a dynamic per-layer array (up to LANDLOCK_MAX_NUM_LAYERS entries) reserved from the trace ring buffer, not the caller's stack, and rendered symbolically per layer. A WARN_ON_ONCE() in __trace_landlock_fill_layers() flags a rule whose layer levels fall outside the domain range or are unsorted, a cannot-happen case; the zero-filled slots keep the rendered output and the array bounds safe regardless. Setting allowed_parent2 to true for non-dom-check requests when get_inode_id() returns false preserves the pre-refactoring behavior: a negative dentry (no backing inode) has no matching rule, so the access is allowed at this path component. Before the refactoring, landlock_unmask_layers() with a NULL rule produced this result as a side effect; now the caller must set it explicitly. Name the trace-only check_rule fields so each printk label equals its ring-buffer field name and works directly as an ftrace filter: the request field is labelled access_request= and the per-layer array is named grants. Values audit also logs keep audit's label (domain=, ruleset=) so a single filter works across trace and audit. 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/20260811094338.288094-12-mic@digikod.net Signed-off-by: Mickaël Salaün <mic@digikod.net> |
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