From bed9d72177abe904979991a99cd191173579a567 Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Tue, 30 Sep 2025 14:44:45 -0400
Subject: kern: mac: Add MAC resource querying

Introduce a feature where a program with the correct rights may get
information about a MAC object

Signed-off-by: Ian Moffett <ian@osmora.org>
---
 src/sys/include/compat/unix/syscall.h |  8 +++++++-
 src/sys/include/sys/mac.h             | 10 ++++++++++
 src/sys/include/sys/syscall.h         |  1 +
 3 files changed, 18 insertions(+), 1 deletion(-)

(limited to 'src/sys/include')

diff --git a/src/sys/include/compat/unix/syscall.h b/src/sys/include/compat/unix/syscall.h
index 88c86ba..d39f627 100644
--- a/src/sys/include/compat/unix/syscall.h
+++ b/src/sys/include/compat/unix/syscall.h
@@ -49,12 +49,18 @@ scret_t sys_write(struct syscall_args *scargs);
  */
 scret_t sys_cross(struct syscall_args *scargs);
 
+/*
+ * Query a syscall border - L5 mandatory
+ */
+scret_t sys_query(struct syscall_args *scargs);
+
 #ifdef _NEED_UNIX_SCTAB
 scret_t(*g_unix_sctab[])(struct syscall_args *) = {
     [SYS_none]   = NULL,
     [SYS_exit]   = sys_exit,
     [SYS_write]  = sys_write,
-    [SYS_cross]  = sys_cross
+    [SYS_cross]  = sys_cross,
+    [SYS_query]  = sys_query
 };
 
 #endif  /* !_NEED_UNIX_SCTAB */
diff --git a/src/sys/include/sys/mac.h b/src/sys/include/sys/mac.h
index 4bd46c0..72c0ba2 100644
--- a/src/sys/include/sys/mac.h
+++ b/src/sys/include/sys/mac.h
@@ -61,5 +61,15 @@ ssize_t cross(
     int flags, void *res
 );
 
+/*
+ * Query a resource border
+ *
+ * @id: Border ID
+ * @buf: Buffer to store data
+ * @len: Length of buffer
+ * @flags: Optional flags
+ */
+int query(border_id_t id, void *buf, size_t len, int flags);
+
 #endif  /* _KERNEL */
 #endif  /* !_SYS_MAC_H_ */
diff --git a/src/sys/include/sys/syscall.h b/src/sys/include/sys/syscall.h
index 5ec48c3..215ea22 100644
--- a/src/sys/include/sys/syscall.h
+++ b/src/sys/include/sys/syscall.h
@@ -47,6 +47,7 @@
 #define SYS_write       0x02
 #define SYS_cross       0x03    /* cross a border (mandatory) */
 #define SYS_sigaction   0x04
+#define SYS_query       0x05    /* query a border (mandatory) */
 
 typedef __ssize_t scret_t;
 typedef __ssize_t scarg_t;
-- 
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