Updated AppArmor with a newer backported AppArmor release by UBports

security/apparmor/include/path.h

@@ -18,15 +18,72 @@
 
 enum path_flags {
 	PATH_IS_DIR = 0x1,		/* path is a directory */
+	PATH_SOCK_COND = 0x2,
 	PATH_CONNECT_PATH = 0x4,	/* connect disconnected paths to / */
 	PATH_CHROOT_REL = 0x8,		/* do path lookup relative to chroot */
 	PATH_CHROOT_NSCONNECT = 0x10,	/* connect paths that are at ns root */
 
 	PATH_DELEGATE_DELETED = 0x08000, /* delegate deleted files */
-	PATH_MEDIATE_DELETED = 0x10000,	/* mediate deleted paths */
+	PATH_MEDIATE_DELETED = 0x10000,	 /* mediate deleted paths */
 };
 
-int aa_path_name(struct path *path, int flags, char **buffer,
-		 const char **name, const char **info);
+int aa_path_name(struct path *path, int flags, char *buffer,
+		 const char **name, const char **info, const char *disconnect);
+
+#define MAX_PATH_BUFFERS 2
+
+/* Per cpu buffers used during mediation */
+/* preallocated buffers to use during path lookups */
+struct aa_buffers {
+	char *buf[MAX_PATH_BUFFERS];
+};
+
+#include <linux/percpu.h>
+#include <linux/preempt.h>
+
+DECLARE_PER_CPU(struct aa_buffers, aa_buffers);
+
+#define COUNT_ARGS(X...) COUNT_ARGS_HELPER ( , ##X ,9,8,7,6,5,4,3,2,1,0)
+#define COUNT_ARGS_HELPER(_0,_1,_2,_3,_4,_5,_6,_7,_8,_9,n,X...) n
+#define CONCAT(X, Y) X ## Y
+#define CONCAT_AFTER(X, Y) CONCAT(X, Y)
+
+#define ASSIGN(FN, X, N) do { (X) = FN(N); } while (0)
+#define EVAL1(FN, X) ASSIGN(FN, X, 0) /*X = FN(0)*/
+#define EVAL2(FN, X, Y...) ASSIGN(FN, X, 1); /*X = FN(1);*/ EVAL1(FN, Y)
+#define EVAL(FN, X...) CONCAT_AFTER(EVAL, COUNT_ARGS(X))(FN, X)
+
+#define for_each_cpu_buffer(I) for ((I) = 0; (I) < MAX_PATH_BUFFERS; (I)++)
+
+#ifdef CONFIG_DEBUG_PREEMPT
+#define AA_BUG_PREEMPT_ENABLED(X) AA_BUG(preempt_count() <= 0, X)
+#else
+#define AA_BUG_PREEMPT_ENABLED(X) /* nop */
+#endif
+
+#define __get_buffer(N) ({					\
+	struct aa_buffers *__cpu_var; \
+	AA_BUG_PREEMPT_ENABLED("__get_buffer without preempt disabled");  \
+	__cpu_var = this_cpu_ptr(&aa_buffers);			\
+        __cpu_var->buf[(N)]; })
+
+#define __get_buffers(X...)		\
+do {					\
+	EVAL(__get_buffer, X);		\
+} while (0)
+
+#define __put_buffers(X, Y...) (void)&(X)
+
+#define get_buffers(X...)	\
+do {				\
+	preempt_disable();	\
+	__get_buffers(X);	\
+} while (0)
+
+#define put_buffers(X, Y...)	\
+do {				\
+	__put_buffers(X, Y);	\
+	preempt_enable();	\
+} while (0)
 
 #endif /* __AA_PATH_H */