81 lines
2.2 KiB
C
Executable file
81 lines
2.2 KiB
C
Executable file
/*
|
|
* AppArmor security module
|
|
*
|
|
* This file contains AppArmor basic path manipulation function definitions.
|
|
*
|
|
* Copyright (C) 1998-2008 Novell/SUSE
|
|
* Copyright 2009-2010 Canonical Ltd.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License as
|
|
* published by the Free Software Foundation, version 2 of the
|
|
* License.
|
|
*/
|
|
|
|
#ifndef __AA_PATH_H
|
|
#define __AA_PATH_H
|
|
|
|
|
|
enum path_flags {
|
|
PATH_IS_DIR = 0x1, /* path is a directory */
|
|
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 */
|
|
};
|
|
|
|
int aa_path_name(const struct path *path, int flags, char *buffer,
|
|
const char **name, const char **info,
|
|
const char *disconnected);
|
|
|
|
#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 ASSIGN(FN, A, X, N) ((X) = FN(A, N))
|
|
#define EVAL1(FN, A, X) ASSIGN(FN, A, X, 0) /*X = FN(0)*/
|
|
#define EVAL2(FN, A, X, Y...) \
|
|
do { ASSIGN(FN, A, X, 1); EVAL1(FN, A, Y); } while (0)
|
|
#define EVAL(FN, A, X...) CONCATENATE(EVAL, COUNT_ARGS(X))(FN, A, 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(C, N) ({ \
|
|
AA_BUG_PREEMPT_ENABLED("__get_buffer without preempt disabled"); \
|
|
(C)->buf[(N)]; })
|
|
|
|
#define __get_buffers(C, X...) EVAL(__get_buffer, C, X)
|
|
|
|
#define __put_buffers(X, Y...) ((void)&(X))
|
|
|
|
#define get_buffers(X...) \
|
|
do { \
|
|
struct aa_buffers *__cpu_var = get_cpu_ptr(&aa_buffers); \
|
|
__get_buffers(__cpu_var, X); \
|
|
} while (0)
|
|
|
|
#define put_buffers(X, Y...) \
|
|
do { \
|
|
__put_buffers(X, Y); \
|
|
put_cpu_ptr(&aa_buffers); \
|
|
} while (0)
|
|
|
|
#endif /* __AA_PATH_H */
|