From: Casey Schaufler <casey@schaufler-ca.com>
To: casey.schaufler@intel.com, jmorris@namei.org,
linux-security-module@vger.kernel.org, selinux@vger.kernel.org
Cc: casey@schaufler-ca.com, linux-audit@redhat.com,
keescook@chromium.org, john.johansen@canonical.com,
penguin-kernel@i-love.sakura.ne.jp, paul@paul-moore.com,
stephen.smalley.work@gmail.com, linux-kernel@vger.kernel.org
Subject: [PATCH v37 04/33] LSM: provide lsm name and id slot mappings
Date: Mon, 27 Jun 2022 17:55:42 -0700 [thread overview]
Message-ID: <20220628005611.13106-5-casey@schaufler-ca.com> (raw)
In-Reply-To: <20220628005611.13106-1-casey@schaufler-ca.com>
Provide interfaces to map LSM slot numbers and LSM names.
Update the LSM registration code to save this information.
Acked-by: Paul Moore <paul@paul-moore.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
---
include/linux/security.h | 4 ++++
security/security.c | 45 ++++++++++++++++++++++++++++++++++++++++
2 files changed, 49 insertions(+)
diff --git a/include/linux/security.h b/include/linux/security.h
index 835fbb86a2bc..5b7a21237fea 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -197,6 +197,10 @@ static inline bool lsmblob_equal(const struct lsmblob *bloba,
return !memcmp(bloba, blobb, sizeof(*bloba));
}
+/* Map lsm names to blob slot numbers */
+extern int lsm_name_to_slot(char *name);
+extern const char *lsm_slot_to_name(int slot);
+
/* These functions are in security/commoncap.c */
extern int cap_capable(const struct cred *cred, struct user_namespace *ns,
int cap, unsigned int opts);
diff --git a/security/security.c b/security/security.c
index 8fdf046fc749..37c14572501e 100644
--- a/security/security.c
+++ b/security/security.c
@@ -478,6 +478,50 @@ static int lsm_append(const char *new, char **result)
* Current index to use while initializing the lsmblob secid list.
*/
static int lsm_slot __lsm_ro_after_init;
+static struct lsm_id *lsm_slotlist[LSMBLOB_ENTRIES] __lsm_ro_after_init;
+
+/**
+ * lsm_name_to_slot - Report the slot number for a security module
+ * @name: name of the security module
+ *
+ * Look up the slot number for the named security module.
+ * Returns the slot number or LSMBLOB_INVALID if @name is not
+ * a registered security module name.
+ */
+int lsm_name_to_slot(char *name)
+{
+ int i;
+
+ for (i = 0; i < lsm_slot; i++)
+ if (strcmp(lsm_slotlist[i]->lsm, name) == 0)
+ return i;
+
+ return LSMBLOB_INVALID;
+}
+
+/**
+ * lsm_slot_to_name - Get the name of the security module in a slot
+ * @slot: index into the interface LSM slot list.
+ *
+ * Provide the name of the security module associated with
+ * a interface LSM slot.
+ *
+ * If @slot is LSMBLOB_INVALID return the value
+ * for slot 0 if it has been set, otherwise NULL.
+ *
+ * Returns a pointer to the name string or NULL.
+ */
+const char *lsm_slot_to_name(int slot)
+{
+ if (slot == LSMBLOB_INVALID)
+ slot = 0;
+ else if (slot >= LSMBLOB_ENTRIES || slot < 0)
+ return NULL;
+
+ if (lsm_slotlist[slot] == NULL)
+ return NULL;
+ return lsm_slotlist[slot]->lsm;
+}
/**
* security_add_hooks - Add a modules hooks to the hook lists.
@@ -499,6 +543,7 @@ void __init security_add_hooks(struct security_hook_list *hooks, int count,
if (lsmid->slot == LSMBLOB_NEEDED) {
if (lsm_slot >= LSMBLOB_ENTRIES)
panic("%s Too many LSMs registered.\n", __func__);
+ lsm_slotlist[lsm_slot] = lsmid;
lsmid->slot = lsm_slot++;
init_debug("%s assigned lsmblob slot %d\n", lsmid->lsm,
lsmid->slot);
--
2.36.1
next prev parent reply other threads:[~2022-06-28 1:00 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20220628005611.13106-1-casey.ref@schaufler-ca.com>
2022-06-28 0:55 ` [PATCH v37 00/33] LSM: Module stacking for AppArmor Casey Schaufler
2022-06-28 0:55 ` [PATCH v37 01/33] integrity: disassociate ima_filter_rule from security_audit_rule Casey Schaufler
2022-06-28 0:55 ` [PATCH v37 02/33] LSM: Infrastructure management of the sock security Casey Schaufler
2022-06-28 0:55 ` [PATCH v37 03/33] LSM: Add the lsmblob data structure Casey Schaufler
2022-06-28 0:55 ` Casey Schaufler [this message]
2022-06-28 0:55 ` [PATCH v37 05/33] IMA: avoid label collisions with stacked LSMs Casey Schaufler
2022-06-28 0:55 ` [PATCH v37 06/33] LSM: Use lsmblob in security_audit_rule_match Casey Schaufler
2022-06-28 0:55 ` [PATCH v37 07/33] LSM: Use lsmblob in security_kernel_act_as Casey Schaufler
2022-06-28 0:55 ` [PATCH v37 08/33] LSM: Use lsmblob in security_secctx_to_secid Casey Schaufler
2022-06-28 0:55 ` [PATCH v37 09/33] LSM: Use lsmblob in security_secid_to_secctx Casey Schaufler
2022-06-28 0:55 ` [PATCH v37 10/33] LSM: Use lsmblob in security_ipc_getsecid Casey Schaufler
2022-06-28 0:55 ` [PATCH v37 11/33] LSM: Use lsmblob in security_current_getsecid Casey Schaufler
2022-06-28 0:55 ` [PATCH v37 12/33] LSM: Use lsmblob in security_inode_getsecid Casey Schaufler
2022-06-28 0:55 ` [PATCH v37 13/33] LSM: Use lsmblob in security_cred_getsecid Casey Schaufler
2022-06-28 0:55 ` [PATCH v37 14/33] LSM: Specify which LSM to display Casey Schaufler
2022-06-28 0:55 ` [PATCH v37 15/33] LSM: Ensure the correct LSM context releaser Casey Schaufler
2022-06-28 0:55 ` [PATCH v37 16/33] LSM: Use lsmcontext in security_secid_to_secctx Casey Schaufler
2022-06-28 0:55 ` [PATCH v37 17/33] LSM: Use lsmcontext in security_inode_getsecctx Casey Schaufler
2022-06-28 0:55 ` [PATCH v37 18/33] LSM: Use lsmcontext in security_dentry_init_security Casey Schaufler
2022-06-28 5:36 ` kernel test robot
2022-06-28 8:44 ` kernel test robot
2022-06-28 11:24 ` kernel test robot
2022-06-28 0:55 ` [PATCH v37 19/33] LSM: security_secid_to_secctx in netlink netfilter Casey Schaufler
2022-06-28 0:55 ` [PATCH v37 20/33] NET: Store LSM netlabel data in a lsmblob Casey Schaufler
2022-06-28 0:55 ` [PATCH v37 21/33] binder: Pass LSM identifier for confirmation Casey Schaufler
2022-06-28 0:56 ` [PATCH v37 22/33] LSM: security_secid_to_secctx module selection Casey Schaufler
2022-06-28 0:56 ` [PATCH v37 23/33] Audit: Keep multiple LSM data in audit_names Casey Schaufler
2022-06-28 0:56 ` [PATCH v37 24/33] Audit: Create audit_stamp structure Casey Schaufler
2022-06-28 0:56 ` [PATCH v37 25/33] LSM: Add a function to report multiple LSMs Casey Schaufler
2022-06-28 0:56 ` [PATCH v37 26/33] Audit: Allow multiple records in an audit_buffer Casey Schaufler
2022-06-28 0:56 ` [PATCH v37 27/33] Audit: Add record for multiple task security contexts Casey Schaufler
2022-06-28 0:56 ` [PATCH v37 28/33] audit: multiple subject lsm values for netlabel Casey Schaufler
2022-06-28 0:56 ` [PATCH v37 29/33] Audit: Add record for multiple object contexts Casey Schaufler
2022-06-28 0:56 ` [PATCH v37 30/33] netlabel: Use a struct lsmblob in audit data Casey Schaufler
2022-06-28 0:56 ` [PATCH v37 31/33] LSM: Removed scaffolding function lsmcontext_init Casey Schaufler
2022-06-28 0:56 ` [PATCH v37 32/33] LSM: Add /proc attr entry for full LSM context Casey Schaufler
2022-06-28 0:56 ` [PATCH v37 33/33] AppArmor: Remove the exclusive flag Casey Schaufler
2022-07-12 21:42 ` [PATCH v37 00/33] LSM: Module stacking for AppArmor John Johansen
2022-07-12 21:58 ` Casey Schaufler
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