cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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policy_unpack.h (3445B)

      1/* SPDX-License-Identifier: GPL-2.0-only */
      2/*
      3 * AppArmor security module
      4 *
      5 * This file contains AppArmor policy loading interface function definitions.
      6 *
      7 * Copyright (C) 1998-2008 Novell/SUSE
      8 * Copyright 2009-2010 Canonical Ltd.
      9 */
     10
     11#ifndef __POLICY_INTERFACE_H
     12#define __POLICY_INTERFACE_H
     13
     14#include <linux/list.h>
     15#include <linux/kref.h>
     16#include <linux/dcache.h>
     17#include <linux/workqueue.h>
     18
     19struct aa_load_ent {
     20	struct list_head list;
     21	struct aa_profile *new;
     22	struct aa_profile *old;
     23	struct aa_profile *rename;
     24	const char *ns_name;
     25};
     26
     27void aa_load_ent_free(struct aa_load_ent *ent);
     28struct aa_load_ent *aa_load_ent_alloc(void);
     29
     30#define PACKED_FLAG_HAT		1
     31
     32#define PACKED_MODE_ENFORCE	0
     33#define PACKED_MODE_COMPLAIN	1
     34#define PACKED_MODE_KILL	2
     35#define PACKED_MODE_UNCONFINED	3
     36
     37struct aa_ns;
     38
     39enum {
     40	AAFS_LOADDATA_ABI = 0,
     41	AAFS_LOADDATA_REVISION,
     42	AAFS_LOADDATA_HASH,
     43	AAFS_LOADDATA_DATA,
     44	AAFS_LOADDATA_COMPRESSED_SIZE,
     45	AAFS_LOADDATA_DIR,		/* must be last actual entry */
     46	AAFS_LOADDATA_NDENTS		/* count of entries */
     47};
     48
     49/*
     50 * struct aa_loaddata - buffer of policy raw_data set
     51 *
     52 * there is no loaddata ref for being on ns list, nor a ref from
     53 * d_inode(@dentry) when grab a ref from these, @ns->lock must be held
     54 * && __aa_get_loaddata() needs to be used, and the return value
     55 * checked, if NULL the loaddata is already being reaped and should be
     56 * considered dead.
     57 */
     58struct aa_loaddata {
     59	struct kref count;
     60	struct list_head list;
     61	struct work_struct work;
     62	struct dentry *dents[AAFS_LOADDATA_NDENTS];
     63	struct aa_ns *ns;
     64	char *name;
     65	size_t size;			/* the original size of the payload */
     66	size_t compressed_size;		/* the compressed size of the payload */
     67	long revision;			/* the ns policy revision this caused */
     68	int abi;
     69	unsigned char *hash;
     70
     71	/* Pointer to payload. If @compressed_size > 0, then this is the
     72	 * compressed version of the payload, else it is the uncompressed
     73	 * version (with the size indicated by @size).
     74	 */
     75	char *data;
     76};
     77
     78int aa_unpack(struct aa_loaddata *udata, struct list_head *lh, const char **ns);
     79
     80/**
     81 * __aa_get_loaddata - get a reference count to uncounted data reference
     82 * @data: reference to get a count on
     83 *
     84 * Returns: pointer to reference OR NULL if race is lost and reference is
     85 *          being repeated.
     86 * Requires: @data->ns->lock held, and the return code MUST be checked
     87 *
     88 * Use only from inode->i_private and @data->list found references
     89 */
     90static inline struct aa_loaddata *
     91__aa_get_loaddata(struct aa_loaddata *data)
     92{
     93	if (data && kref_get_unless_zero(&(data->count)))
     94		return data;
     95
     96	return NULL;
     97}
     98
     99/**
    100 * aa_get_loaddata - get a reference count from a counted data reference
    101 * @data: reference to get a count on
    102 *
    103 * Returns: point to reference
    104 * Requires: @data to have a valid reference count on it. It is a bug
    105 *           if the race to reap can be encountered when it is used.
    106 */
    107static inline struct aa_loaddata *
    108aa_get_loaddata(struct aa_loaddata *data)
    109{
    110	struct aa_loaddata *tmp = __aa_get_loaddata(data);
    111
    112	AA_BUG(data && !tmp);
    113
    114	return tmp;
    115}
    116
    117void __aa_loaddata_update(struct aa_loaddata *data, long revision);
    118bool aa_rawdata_eq(struct aa_loaddata *l, struct aa_loaddata *r);
    119void aa_loaddata_kref(struct kref *kref);
    120struct aa_loaddata *aa_loaddata_alloc(size_t size);
    121static inline void aa_put_loaddata(struct aa_loaddata *data)
    122{
    123	if (data)
    124		kref_put(&data->count, aa_loaddata_kref);
    125}
    126
    127#endif /* __POLICY_INTERFACE_H */