2 * AppArmor security module
4 * This file contains AppArmor basic path manipulation function definitions.
6 * Copyright (C) 1998-2008 Novell/SUSE
7 * Copyright 2009-2010 Canonical Ltd.
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License as
11 * published by the Free Software Foundation, version 2 of the
20 PATH_IS_DIR = 0x1, /* path is a directory */
21 PATH_CONNECT_PATH = 0x4, /* connect disconnected paths to / */
22 PATH_CHROOT_REL = 0x8, /* do path lookup relative to chroot */
23 PATH_CHROOT_NSCONNECT = 0x10, /* connect paths that are at ns root */
25 PATH_DELEGATE_DELETED = 0x08000, /* delegate deleted files */
26 PATH_MEDIATE_DELETED = 0x10000, /* mediate deleted paths */
29 int aa_path_name(const struct path *path, int flags, char *buffer,
30 const char **name, const char **info,
31 const char *disconnected);
33 #define MAX_PATH_BUFFERS 2
35 /* Per cpu buffers used during mediation */
36 /* preallocated buffers to use during path lookups */
38 char *buf[MAX_PATH_BUFFERS];
41 #include <linux/percpu.h>
42 #include <linux/preempt.h>
44 DECLARE_PER_CPU(struct aa_buffers, aa_buffers);
46 #define ASSIGN(FN, A, X, N) ((X) = FN(A, N))
47 #define EVAL1(FN, A, X) ASSIGN(FN, A, X, 0) /*X = FN(0)*/
48 #define EVAL2(FN, A, X, Y...) \
49 do { ASSIGN(FN, A, X, 1); EVAL1(FN, A, Y); } while (0)
50 #define EVAL(FN, A, X...) CONCATENATE(EVAL, COUNT_ARGS(X))(FN, A, X)
52 #define for_each_cpu_buffer(I) for ((I) = 0; (I) < MAX_PATH_BUFFERS; (I)++)
54 #ifdef CONFIG_DEBUG_PREEMPT
55 #define AA_BUG_PREEMPT_ENABLED(X) AA_BUG(preempt_count() <= 0, X)
57 #define AA_BUG_PREEMPT_ENABLED(X) /* nop */
60 #define __get_buffer(C, N) ({ \
61 AA_BUG_PREEMPT_ENABLED("__get_buffer without preempt disabled"); \
64 #define __get_buffers(C, X...) EVAL(__get_buffer, C, X)
66 #define __put_buffers(X, Y...) ((void)&(X))
68 #define get_buffers(X...) \
70 struct aa_buffers *__cpu_var = get_cpu_ptr(&aa_buffers); \
71 __get_buffers(__cpu_var, X); \
74 #define put_buffers(X, Y...) \
76 __put_buffers(X, Y); \
77 put_cpu_ptr(&aa_buffers); \
80 #endif /* __AA_PATH_H */