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Diffstat (limited to 'security/apparmor/policy_unpack.c')
-rw-r--r--security/apparmor/policy_unpack.c114
1 files changed, 86 insertions, 28 deletions
diff --git a/security/apparmor/policy_unpack.c b/security/apparmor/policy_unpack.c
index 6dac7d77cb4d..080a26b11f01 100644
--- a/security/apparmor/policy_unpack.c
+++ b/security/apparmor/policy_unpack.c
@@ -333,8 +333,10 @@ static struct aa_dfa *unpack_dfa(struct aa_ext *e)
/*
* The dfa is aligned with in the blob to 8 bytes
* from the beginning of the stream.
+ * alignment adjust needed by dfa unpack
*/
- size_t sz = blob - (char *)e->start;
+ size_t sz = blob - (char *) e->start -
+ ((e->pos - e->start) & 7);
size_t pad = ALIGN(sz, 8) - sz;
int flags = TO_ACCEPT1_FLAG(YYTD_DATA32) |
TO_ACCEPT2_FLAG(YYTD_DATA32);
@@ -622,29 +624,41 @@ fail:
/**
* verify_head - unpack serialized stream header
* @e: serialized data read head (NOT NULL)
+ * @required: whether the header is required or optional
* @ns: Returns - namespace if one is specified else NULL (NOT NULL)
*
* Returns: error or 0 if header is good
*/
-static int verify_header(struct aa_ext *e, const char **ns)
+static int verify_header(struct aa_ext *e, int required, const char **ns)
{
int error = -EPROTONOSUPPORT;
+ const char *name = NULL;
+ *ns = NULL;
+
/* get the interface version */
if (!unpack_u32(e, &e->version, "version")) {
- audit_iface(NULL, NULL, "invalid profile format", e, error);
- return error;
- }
+ if (required) {
+ audit_iface(NULL, NULL, "invalid profile format", e,
+ error);
+ return error;
+ }
- /* check that the interface version is currently supported */
- if (e->version != 5) {
- audit_iface(NULL, NULL, "unsupported interface version", e,
- error);
- return error;
+ /* check that the interface version is currently supported */
+ if (e->version != 5) {
+ audit_iface(NULL, NULL, "unsupported interface version",
+ e, error);
+ return error;
+ }
}
+
/* read the namespace if present */
- if (!unpack_str(e, ns, "namespace"))
- *ns = NULL;
+ if (unpack_str(e, &name, "namespace")) {
+ if (*ns && strcmp(*ns, name))
+ audit_iface(NULL, NULL, "invalid ns change", e, error);
+ else if (!*ns)
+ *ns = name;
+ }
return 0;
}
@@ -693,18 +707,40 @@ static int verify_profile(struct aa_profile *profile)
return 0;
}
+void aa_load_ent_free(struct aa_load_ent *ent)
+{
+ if (ent) {
+ aa_put_profile(ent->rename);
+ aa_put_profile(ent->old);
+ aa_put_profile(ent->new);
+ kzfree(ent);
+ }
+}
+
+struct aa_load_ent *aa_load_ent_alloc(void)
+{
+ struct aa_load_ent *ent = kzalloc(sizeof(*ent), GFP_KERNEL);
+ if (ent)
+ INIT_LIST_HEAD(&ent->list);
+ return ent;
+}
+
/**
- * aa_unpack - unpack packed binary profile data loaded from user space
+ * aa_unpack - unpack packed binary profile(s) data loaded from user space
* @udata: user data copied to kmem (NOT NULL)
* @size: the size of the user data
+ * @lh: list to place unpacked profiles in a aa_repl_ws
* @ns: Returns namespace profile is in if specified else NULL (NOT NULL)
*
- * Unpack user data and return refcounted allocated profile or ERR_PTR
+ * Unpack user data and return refcounted allocated profile(s) stored in
+ * @lh in order of discovery, with the list chain stored in base.list
+ * or error
*
- * Returns: profile else error pointer if fails to unpack
+ * Returns: profile(s) on @lh else error pointer if fails to unpack
*/
-struct aa_profile *aa_unpack(void *udata, size_t size, const char **ns)
+int aa_unpack(void *udata, size_t size, struct list_head *lh, const char **ns)
{
+ struct aa_load_ent *tmp, *ent;
struct aa_profile *profile = NULL;
int error;
struct aa_ext e = {
@@ -713,20 +749,42 @@ struct aa_profile *aa_unpack(void *udata, size_t size, const char **ns)
.pos = udata,
};
- error = verify_header(&e, ns);
- if (error)
- return ERR_PTR(error);
+ *ns = NULL;
+ while (e.pos < e.end) {
+ error = verify_header(&e, e.pos == e.start, ns);
+ if (error)
+ goto fail;
- profile = unpack_profile(&e);
- if (IS_ERR(profile))
- return profile;
+ profile = unpack_profile(&e);
+ if (IS_ERR(profile)) {
+ error = PTR_ERR(profile);
+ goto fail;
+ }
+
+ error = verify_profile(profile);
+ if (error) {
+ aa_put_profile(profile);
+ goto fail;
+ }
+
+ ent = aa_load_ent_alloc();
+ if (!ent) {
+ error = -ENOMEM;
+ aa_put_profile(profile);
+ goto fail;
+ }
- error = verify_profile(profile);
- if (error) {
- aa_put_profile(profile);
- profile = ERR_PTR(error);
+ ent->new = profile;
+ list_add_tail(&ent->list, lh);
}
- /* return refcount */
- return profile;
+ return 0;
+
+fail:
+ list_for_each_entry_safe(ent, tmp, lh, list) {
+ list_del_init(&ent->list);
+ aa_load_ent_free(ent);
+ }
+
+ return error;
}