/*
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* AppArmor security module
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*
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* This file contains AppArmor basic path manipulation function definitions.
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*
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* Copyright (C) 1998-2008 Novell/SUSE
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* Copyright 2009-2010 Canonical Ltd.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation, version 2 of the
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* License.
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*/
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#ifndef __AA_PATH_H
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#define __AA_PATH_H
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enum path_flags {
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PATH_IS_DIR = 0x1, /* path is a directory */
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PATH_CONNECT_PATH = 0x4, /* connect disconnected paths to / */
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PATH_CHROOT_REL = 0x8, /* do path lookup relative to chroot */
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PATH_CHROOT_NSCONNECT = 0x10, /* connect paths that are at ns root */
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PATH_DELEGATE_DELETED = 0x08000, /* delegate deleted files */
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PATH_MEDIATE_DELETED = 0x10000, /* mediate deleted paths */
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};
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int aa_path_name(const struct path *path, int flags, char *buffer,
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const char **name, const char **info,
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const char *disconnected);
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#define MAX_PATH_BUFFERS 2
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/* Per cpu buffers used during mediation */
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/* preallocated buffers to use during path lookups */
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struct aa_buffers {
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char *buf[MAX_PATH_BUFFERS];
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};
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#include <linux/percpu.h>
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#include <linux/preempt.h>
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#include <linux/locallock.h>
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DECLARE_PER_CPU(struct aa_buffers, aa_buffers);
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DECLARE_LOCAL_IRQ_LOCK(aa_buffers_lock);
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#define ASSIGN(FN, A, X, N) ((X) = FN(A, N))
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#define EVAL1(FN, A, X) ASSIGN(FN, A, X, 0) /*X = FN(0)*/
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#define EVAL2(FN, A, X, Y...) \
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do { ASSIGN(FN, A, X, 1); EVAL1(FN, A, Y); } while (0)
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#define EVAL(FN, A, X...) CONCATENATE(EVAL, COUNT_ARGS(X))(FN, A, X)
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#define for_each_cpu_buffer(I) for ((I) = 0; (I) < MAX_PATH_BUFFERS; (I)++)
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#ifdef CONFIG_PREEMPT_RT_BASE
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static inline void AA_BUG_PREEMPT_ENABLED(const char *s)
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{
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struct local_irq_lock *lv;
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lv = this_cpu_ptr(&aa_buffers_lock);
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WARN_ONCE(lv->owner != current,
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"__get_buffer without aa_buffers_lock\n");
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}
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#elif defined(CONFIG_DEBUG_PREEMPT)
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#define AA_BUG_PREEMPT_ENABLED(X) AA_BUG(preempt_count() <= 0, X)
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#else
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#define AA_BUG_PREEMPT_ENABLED(X) /* nop */
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#endif
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#define __get_buffer(C, N) ({ \
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AA_BUG_PREEMPT_ENABLED("__get_buffer without preempt disabled"); \
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(C)->buf[(N)]; })
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#define __get_buffers(C, X...) EVAL(__get_buffer, C, X)
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#define __put_buffers(X, Y...) ((void)&(X))
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#define get_buffers(X...) \
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do { \
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struct aa_buffers *__cpu_var; \
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__cpu_var = get_locked_ptr(aa_buffers_lock, &aa_buffers); \
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__get_buffers(__cpu_var, X); \
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} while (0)
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#define put_buffers(X, Y...) \
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do { \
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__put_buffers(X, Y); \
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put_locked_ptr(aa_buffers_lock, &aa_buffers); \
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} while (0)
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#endif /* __AA_PATH_H */
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