[apparmor] [PATCH 12/43] apparmor: remove sid from profiles
John Johansen
john.johansen at canonical.com
Fri Feb 8 21:00:48 UTC 2013
The sid is not going to be a direct property of a profile anymore, instead
it will be directly related to the label, and the profile will pickup
a label back reference.
For null-profiles replace the use of sid with a per namespace unique
id.
Signed-off-by: John Johansen <john.johansen at canonical.com>
Acked-by: Kees Cook <kees at ubuntu.com>
---
security/apparmor/include/policy.h | 4 ++--
security/apparmor/include/sid.h | 4 +++-
security/apparmor/policy.c | 23 ++++++-----------------
security/apparmor/policy_unpack.c | 1 -
4 files changed, 11 insertions(+), 21 deletions(-)
diff --git a/security/apparmor/include/policy.h b/security/apparmor/include/policy.h
index 95979c4..b25491a 100644
--- a/security/apparmor/include/policy.h
+++ b/security/apparmor/include/policy.h
@@ -105,6 +105,7 @@ struct aa_ns_acct {
* @acct: accounting for the namespace
* @unconfined: special unconfined profile for the namespace
* @sub_ns: list of namespaces under the current namespace.
+ * @uniq_null: uniq value used for null learning profiles
*
* An aa_namespace defines the set profiles that are searched to determine
* which profile to attach to a task. Profiles can not be shared between
@@ -127,6 +128,7 @@ struct aa_namespace {
struct aa_ns_acct acct;
struct aa_profile *unconfined;
struct list_head sub_ns;
+ atomic_t uniq_null;
};
/* struct aa_policydb - match engine for a policy
@@ -148,7 +150,6 @@ struct aa_policydb {
* @rename: optional profile name that this profile renamed
* @xmatch: optional extended matching for unconfined executables names
* @xmatch_len: xmatch prefix len, used to determine xmatch priority
- * @sid: the unique security id number of this profile
* @audit: the auditing mode of the profile
* @mode: the enforcement mode of the profile
* @flags: flags controlling profile behavior
@@ -184,7 +185,6 @@ struct aa_profile {
struct aa_dfa *xmatch;
int xmatch_len;
- u32 sid;
enum audit_mode audit;
enum profile_mode mode;
u32 flags;
diff --git a/security/apparmor/include/sid.h b/security/apparmor/include/sid.h
index 020db35..513ca0e 100644
--- a/security/apparmor/include/sid.h
+++ b/security/apparmor/include/sid.h
@@ -16,7 +16,9 @@
#include <linux/types.h>
-struct aa_profile;
+/* sid value that will not be allocated */
+#define AA_SID_INVALID 0
+#define AA_SID_ALLOC AA_SID_INVALID
u32 aa_alloc_sid(void);
void aa_free_sid(u32 sid);
diff --git a/security/apparmor/policy.c b/security/apparmor/policy.c
index 8132003..13fc9ef 100644
--- a/security/apparmor/policy.c
+++ b/security/apparmor/policy.c
@@ -87,7 +87,6 @@
#include "include/policy.h"
#include "include/policy_unpack.h"
#include "include/resource.h"
-#include "include/sid.h"
/* root profile namespace */
@@ -292,7 +291,6 @@ static struct aa_namespace *alloc_namespace(const char *prefix,
if (!ns->unconfined)
goto fail_unconfined;
- ns->unconfined->sid = aa_alloc_sid();
ns->unconfined->flags = PFLAG_UNCONFINED | PFLAG_IX_ON_NAME_ERROR |
PFLAG_IMMUTABLE;
@@ -303,6 +301,8 @@ static struct aa_namespace *alloc_namespace(const char *prefix,
*/
ns->unconfined->ns = aa_get_namespace(ns);
+ atomic_set(&ns->uniq_null, 0);
+
return ns;
fail_unconfined:
@@ -497,7 +497,6 @@ static void __replace_profile(struct aa_profile *old, struct aa_profile *new)
/* released when @new is freed */
new->parent = aa_get_profile(old->parent);
new->ns = aa_get_namespace(old->ns);
- new->sid = old->sid;
__list_add_profile(&policy->profiles, new);
/* inherit children */
list_for_each_entry_safe(child, tmp, &old->base.profiles, base.list) {
@@ -665,7 +664,7 @@ struct aa_profile *aa_alloc_profile(const char *hname)
* @hat: true if the null- learning profile is a hat
*
* Create a null- complain mode profile used in learning mode. The name of
- * the profile is unique and follows the format of parent//null-sid.
+ * the profile is unique and follows the format of parent//null-<uniq>.
*
* null profiles are added to the profile list but the list does not
* hold a count on them so that they are automatically released when
@@ -677,20 +676,19 @@ struct aa_profile *aa_new_null_profile(struct aa_profile *parent, int hat)
{
struct aa_profile *profile = NULL;
char *name;
- u32 sid = aa_alloc_sid();
+ int uniq = atomic_inc_return(&parent->ns->uniq_null);
/* freed below */
name = kmalloc(strlen(parent->base.hname) + 2 + 7 + 8, GFP_KERNEL);
if (!name)
goto fail;
- sprintf(name, "%s//null-%x", parent->base.hname, sid);
+ sprintf(name, "%s//null-%x", parent->base.hname, uniq);
profile = aa_alloc_profile(name);
kfree(name);
if (!profile)
goto fail;
- profile->sid = sid;
profile->mode = APPARMOR_COMPLAIN;
profile->flags = PFLAG_NULL;
if (hat)
@@ -708,7 +706,6 @@ struct aa_profile *aa_new_null_profile(struct aa_profile *parent, int hat)
return profile;
fail:
- aa_free_sid(sid);
return NULL;
}
@@ -749,7 +746,6 @@ static void free_profile(struct aa_profile *profile)
aa_free_cap_rules(&profile->caps);
aa_free_rlimit_rules(&profile->rlimits);
- aa_free_sid(profile->sid);
aa_put_dfa(profile->xmatch);
aa_put_dfa(profile->policy.dfa);
@@ -972,7 +968,6 @@ static void __add_new_profile(struct aa_namespace *ns, struct aa_policy *policy,
profile->parent = aa_get_profile((struct aa_profile *) policy);
__list_add_profile(&policy->profiles, profile);
/* released on free_profile */
- profile->sid = aa_alloc_sid();
profile->ns = aa_get_namespace(ns);
}
@@ -1110,14 +1105,8 @@ audit:
if (!error) {
if (rename_profile)
__replace_profile(rename_profile, new_profile);
- if (old_profile) {
- /* when there are both rename and old profiles
- * inherit old profiles sid
- */
- if (rename_profile)
- aa_free_sid(new_profile->sid);
+ if (old_profile)
__replace_profile(old_profile, new_profile);
- }
if (!(old_profile || rename_profile))
__add_new_profile(ns, policy, new_profile);
}
diff --git a/security/apparmor/policy_unpack.c b/security/apparmor/policy_unpack.c
index ca48a7d..6dac7d7 100644
--- a/security/apparmor/policy_unpack.c
+++ b/security/apparmor/policy_unpack.c
@@ -27,7 +27,6 @@
#include "include/match.h"
#include "include/policy.h"
#include "include/policy_unpack.h"
-#include "include/sid.h"
/*
* The AppArmor interface treats data as a type byte followed by the
--
1.7.10.4
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