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apparmor: move to per loaddata files, instead of replicating in profiles

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The loaddata sets cover more than just a single profile and should
be tracked at the ns level. Move the load data files under the namespace
and reference the files from the profiles via a symlink.

Signed-off-by: John Johansen <john.johansen@canonical.com>
Reviewed-by: Seth Arnold <seth.arnold@canonical.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
John Johansen 2017-05-09 00:08:41 -07:00
parent 6623ec7c4d
commit 5d5182cae4
7 changed files with 415 additions and 75 deletions
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68
security/apparmor/include/policy_unpack.h
View file

@ -17,6 +17,8 @@
#include <linux/list.h>
#include <linux/kref.h>
#include <linux/dcache.h>
#include <linux/workqueue.h>
struct aa_load_ent {
struct list_head list;
@ -36,26 +38,84 @@ struct aa_load_ent *aa_load_ent_alloc(void);
#define PACKED_MODE_KILL 2
#define PACKED_MODE_UNCONFINED 3
/* struct aa_loaddata - buffer of policy load data set */
struct aa_ns;
enum {
AAFS_LOADDATA_ABI = 0,
AAFS_LOADDATA_REVISION,
AAFS_LOADDATA_HASH,
AAFS_LOADDATA_DATA,
AAFS_LOADDATA_DIR, /* must be last actual entry */
AAFS_LOADDATA_NDENTS /* count of entries */
};
/*
* struct aa_loaddata - buffer of policy raw_data set
*
* there is no loaddata ref for being on ns list, nor a ref from
* d_inode(@dentry) when grab a ref from these, @ns->lock must be held
* && __aa_get_loaddata() needs to be used, and the return value
* checked, if NULL the loaddata is already being reaped and should be
* considered dead.
*/
struct aa_loaddata {
struct kref count;
struct list_head list;
struct work_struct work;
struct dentry *dents[AAFS_LOADDATA_NDENTS];
struct aa_ns *ns;
char *name;
size_t size;
long revision; /* the ns policy revision this caused */
int abi;
unsigned char *hash;
char data[];
};
int aa_unpack(struct aa_loaddata *udata, struct list_head *lh, const char **ns);
/**
* __aa_get_loaddata - get a reference count to uncounted data reference
* @data: reference to get a count on
*
* Returns: pointer to reference OR NULL if race is lost and reference is
* being repeated.
* Requires: @data->ns->lock held, and the return code MUST be checked
*
* Use only from inode->i_private and @data->list found references
*/
static inline struct aa_loaddata *
__aa_get_loaddata(struct aa_loaddata *data)
{
if (data && kref_get_unless_zero(&(data->count)))
return data;
return NULL;
}
/**
* aa_get_loaddata - get a reference count from a counted data reference
* @data: reference to get a count on
*
* Returns: point to reference
* Requires: @data to have a valid reference count on it. It is a bug
* if the race to reap can be encountered when it is used.
*/
static inline struct aa_loaddata *
aa_get_loaddata(struct aa_loaddata *data)
{
if (data)
kref_get(&(data->count));
return data;
struct aa_loaddata *tmp = __aa_get_loaddata(data);
AA_BUG(data && !tmp);
return tmp;
}
void __aa_loaddata_update(struct aa_loaddata *data, long revision);
bool aa_rawdata_eq(struct aa_loaddata *l, struct aa_loaddata *r);
void aa_loaddata_kref(struct kref *kref);
struct aa_loaddata *aa_loaddata_alloc(size_t size);
static inline void aa_put_loaddata(struct aa_loaddata *data)
{
if (data)