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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * AppArmor security module
4 *
5 * This file contains AppArmor basic path manipulation function definitions.
6 *
7 * Copyright (C) 1998-2008 Novell/SUSE
8 * Copyright 2009-2010 Canonical Ltd.
9 */
10
11#ifndef __AA_PATH_H
12#define __AA_PATH_H
13
14
15enum path_flags {
16 PATH_IS_DIR = 0x1, /* path is a directory */
17 PATH_CONNECT_PATH = 0x4, /* connect disconnected paths to / */
18 PATH_CHROOT_REL = 0x8, /* do path lookup relative to chroot */
19 PATH_CHROOT_NSCONNECT = 0x10, /* connect paths that are at ns root */
20
21 PATH_DELEGATE_DELETED = 0x08000, /* delegate deleted files */
22 PATH_MEDIATE_DELETED = 0x10000, /* mediate deleted paths */
23};
24
25int aa_path_name(const struct path *path, int flags, char *buffer,
26 const char **name, const char **info,
27 const char *disconnected);
28
29#define MAX_PATH_BUFFERS 2
30
31/* Per cpu buffers used during mediation */
32/* preallocated buffers to use during path lookups */
33struct aa_buffers {
34 char *buf[MAX_PATH_BUFFERS];
35};
36
37#include <linux/percpu.h>
38#include <linux/preempt.h>
39
40DECLARE_PER_CPU(struct aa_buffers, aa_buffers);
41
42#define ASSIGN(FN, A, X, N) ((X) = FN(A, N))
43#define EVAL1(FN, A, X) ASSIGN(FN, A, X, 0) /*X = FN(0)*/
44#define EVAL2(FN, A, X, Y...) \
45 do { ASSIGN(FN, A, X, 1); EVAL1(FN, A, Y); } while (0)
46#define EVAL(FN, A, X...) CONCATENATE(EVAL, COUNT_ARGS(X))(FN, A, X)
47
48#define for_each_cpu_buffer(I) for ((I) = 0; (I) < MAX_PATH_BUFFERS; (I)++)
49
50#ifdef CONFIG_DEBUG_PREEMPT
51#define AA_BUG_PREEMPT_ENABLED(X) AA_BUG(preempt_count() <= 0, X)
52#else
53#define AA_BUG_PREEMPT_ENABLED(X) /* nop */
54#endif
55
56#define __get_buffer(C, N) ({ \
57 AA_BUG_PREEMPT_ENABLED("__get_buffer without preempt disabled"); \
58 (C)->buf[(N)]; })
59
60#define __get_buffers(C, X...) EVAL(__get_buffer, C, X)
61
62#define __put_buffers(X, Y...) ((void)&(X))
63
64#define get_buffers(X...) \
65do { \
66 struct aa_buffers *__cpu_var = get_cpu_ptr(&aa_buffers); \
67 __get_buffers(__cpu_var, X); \
68} while (0)
69
70#define put_buffers(X, Y...) \
71do { \
72 __put_buffers(X, Y); \
73 put_cpu_ptr(&aa_buffers); \
74} while (0)
75
76#endif /* __AA_PATH_H */