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
WARNING: multiple messages have this Message-ID (diff)
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: john.johansen@canonical.com, linux-kernel@vger.kernel.org, linux-audit@redhat.com 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 -- Linux-audit mailing list Linux-audit@redhat.com https://listman.redhat.com/mailman/listinfo/linux-audit
next prev parent reply other threads:[~2022-06-28 1:00 UTC|newest] Thread overview: 78+ 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 ` 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 ` 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 ` 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 2022-06-28 0:55 ` Casey Schaufler [this message] 2022-06-28 0:55 ` [PATCH v37 04/33] LSM: provide lsm name and id slot mappings Casey Schaufler 2022-06-28 0:55 ` [PATCH v37 05/33] IMA: avoid label collisions with stacked LSMs Casey Schaufler 2022-06-28 0:55 ` 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 ` 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 ` 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 ` 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 ` 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 ` 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 ` 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 ` 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 ` Casey Schaufler 2022-06-28 0:55 ` [PATCH v37 14/33] LSM: Specify which LSM to display Casey Schaufler 2022-06-28 0:55 ` 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 ` 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 ` 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 ` Casey Schaufler 2022-06-28 0:55 ` [PATCH v37 18/33] LSM: Use lsmcontext in security_dentry_init_security Casey Schaufler 2022-06-28 0:55 ` Casey Schaufler 2022-06-28 5:36 ` kernel test robot 2022-06-28 5:36 ` kernel test robot 2022-06-28 8:44 ` kernel test robot 2022-06-28 8:44 ` kernel test robot 2022-06-28 11:24 ` 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 ` 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 ` Casey Schaufler 2022-06-28 0:55 ` [PATCH v37 21/33] binder: Pass LSM identifier for confirmation Casey Schaufler 2022-06-28 0:55 ` 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 ` 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 ` Casey Schaufler 2022-06-28 0:56 ` [PATCH v37 24/33] Audit: Create audit_stamp structure Casey Schaufler 2022-06-28 0:56 ` 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 ` 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 ` 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 ` 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 ` 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 ` 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 ` Casey Schaufler 2022-06-28 0:56 ` [PATCH v37 31/33] LSM: Removed scaffolding function lsmcontext_init Casey Schaufler 2022-06-28 0:56 ` 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 ` Casey Schaufler 2022-06-28 0:56 ` [PATCH v37 33/33] AppArmor: Remove the exclusive flag Casey Schaufler 2022-06-28 0:56 ` Casey Schaufler 2022-07-12 21:42 ` [PATCH v37 00/33] LSM: Module stacking for AppArmor John Johansen 2022-07-12 21:42 ` John Johansen 2022-07-12 21:58 ` Casey Schaufler 2022-07-12 21:58 ` Casey Schaufler
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