/* * 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 */