Release 4.11 security/apparmor/include/path.h

/*
 * 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);


#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) ((X) = FN(N))

#define EVAL1(FN, X) ASSIGN(FN, X, 0) 
/*X = FN(0)*/

#define EVAL2(FN, X, Y...) do { ASSIGN(FN, X, 1);  EVAL1(FN, Y); } while (0)

#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...)    EVAL(__get_buffer, X)


#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 */
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Directory: security/apparmor/include

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