Linux kernel mirror (for testing)
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linux
1/*
2 * AppArmor security module
3 *
4 * This file contains AppArmor basic path manipulation function definitions.
5 *
6 * Copyright (C) 1998-2008 Novell/SUSE
7 * Copyright 2009-2010 Canonical Ltd.
8 *
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
12 * License.
13 */
14
15#ifndef __AA_PATH_H
16#define __AA_PATH_H
17
18
19enum path_flags {
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 */
24
25 PATH_DELEGATE_DELETED = 0x08000, /* delegate deleted files */
26 PATH_MEDIATE_DELETED = 0x10000, /* mediate deleted paths */
27};
28
29int aa_path_name(const struct path *path, int flags, char *buffer,
30 const char **name, const char **info,
31 const char *disconnected);
32
33#define MAX_PATH_BUFFERS 2
34
35/* Per cpu buffers used during mediation */
36/* preallocated buffers to use during path lookups */
37struct aa_buffers {
38 char *buf[MAX_PATH_BUFFERS];
39};
40
41#include <linux/percpu.h>
42#include <linux/preempt.h>
43
44DECLARE_PER_CPU(struct aa_buffers, aa_buffers);
45
46#define ASSIGN(FN, X, N) ((X) = FN(N))
47#define EVAL1(FN, X) ASSIGN(FN, X, 0) /*X = FN(0)*/
48#define EVAL2(FN, X, Y...) do { ASSIGN(FN, X, 1); EVAL1(FN, Y); } while (0)
49#define EVAL(FN, X...) CONCATENATE(EVAL, COUNT_ARGS(X))(FN, X)
50
51#define for_each_cpu_buffer(I) for ((I) = 0; (I) < MAX_PATH_BUFFERS; (I)++)
52
53#ifdef CONFIG_DEBUG_PREEMPT
54#define AA_BUG_PREEMPT_ENABLED(X) AA_BUG(preempt_count() <= 0, X)
55#else
56#define AA_BUG_PREEMPT_ENABLED(X) /* nop */
57#endif
58
59#define __get_buffer(N) ({ \
60 struct aa_buffers *__cpu_var; \
61 AA_BUG_PREEMPT_ENABLED("__get_buffer without preempt disabled"); \
62 __cpu_var = this_cpu_ptr(&aa_buffers); \
63 __cpu_var->buf[(N)]; })
64
65#define __get_buffers(X...) EVAL(__get_buffer, X)
66
67#define __put_buffers(X, Y...) ((void)&(X))
68
69#define get_buffers(X...) \
70do { \
71 preempt_disable(); \
72 __get_buffers(X); \
73} while (0)
74
75#define put_buffers(X, Y...) \
76do { \
77 __put_buffers(X, Y); \
78 preempt_enable(); \
79} while (0)
80
81#endif /* __AA_PATH_H */