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, sds@tycho.nsa.gov, linux-kernel@vger.kernel.org, Stephen Smalley <stephen.smalley.work@gmail.com> Subject: [PATCH v31 07/28] LSM: Use lsmblob in security_kernel_act_as Date: Mon, 13 Dec 2021 15:40:13 -0800 [thread overview] Message-ID: <20211213234034.111891-8-casey@schaufler-ca.com> (raw) In-Reply-To: <20211213234034.111891-1-casey@schaufler-ca.com> Change the security_kernel_act_as interface to use a lsmblob structure in place of the single u32 secid in support of module stacking. Change its only caller, set_security_override, to do the same. Change that one's only caller, set_security_override_from_ctx, to call it with the new parameter type. The security module hook is unchanged, still taking a secid. The infrastructure passes the correct entry from the lsmblob. lsmblob_init() is used to fill the lsmblob structure, however this will be removed later in the series when security_secctx_to_secid() is updated to provide a lsmblob instead of a secid. Reviewed-by: Kees Cook <keescook@chromium.org> Reviewed-by: John Johansen <john.johansen@canonical.com> Acked-by: Stephen Smalley <stephen.smalley.work@gmail.com> Acked-by: Paul Moore <paul@paul-moore.com> Signed-off-by: Casey Schaufler <casey@schaufler-ca.com> To: David Howells <dhowells@redhat.com> --- include/linux/cred.h | 3 ++- include/linux/security.h | 5 +++-- kernel/cred.c | 10 ++++++---- security/security.c | 14 ++++++++++++-- 4 files changed, 23 insertions(+), 9 deletions(-) diff --git a/include/linux/cred.h b/include/linux/cred.h index fcbc6885cc09..eb02e8514239 100644 --- a/include/linux/cred.h +++ b/include/linux/cred.h @@ -18,6 +18,7 @@ struct cred; struct inode; +struct lsmblob; /* * COW Supplementary groups list @@ -165,7 +166,7 @@ extern const struct cred *override_creds(const struct cred *); extern void revert_creds(const struct cred *); extern struct cred *prepare_kernel_cred(struct task_struct *); extern int change_create_files_as(struct cred *, struct inode *); -extern int set_security_override(struct cred *, u32); +extern int set_security_override(struct cred *, struct lsmblob *); extern int set_security_override_from_ctx(struct cred *, const char *); extern int set_create_files_as(struct cred *, struct inode *); extern int cred_fscmp(const struct cred *, const struct cred *); diff --git a/include/linux/security.h b/include/linux/security.h index 5a29b9bfdeda..aaa63bf5026e 100644 --- a/include/linux/security.h +++ b/include/linux/security.h @@ -464,7 +464,7 @@ void security_cred_free(struct cred *cred); int security_prepare_creds(struct cred *new, const struct cred *old, gfp_t gfp); void security_transfer_creds(struct cred *new, const struct cred *old); void security_cred_getsecid(const struct cred *c, u32 *secid); -int security_kernel_act_as(struct cred *new, u32 secid); +int security_kernel_act_as(struct cred *new, struct lsmblob *blob); int security_kernel_create_files_as(struct cred *new, struct inode *inode); int security_kernel_module_request(char *kmod_name); int security_kernel_load_data(enum kernel_load_data_id id, bool contents); @@ -1112,7 +1112,8 @@ static inline void security_cred_getsecid(const struct cred *c, u32 *secid) *secid = 0; } -static inline int security_kernel_act_as(struct cred *cred, u32 secid) +static inline int security_kernel_act_as(struct cred *cred, + struct lsmblob *blob) { return 0; } diff --git a/kernel/cred.c b/kernel/cred.c index 473d17c431f3..e5e41bd4efc3 100644 --- a/kernel/cred.c +++ b/kernel/cred.c @@ -772,14 +772,14 @@ EXPORT_SYMBOL(prepare_kernel_cred); /** * set_security_override - Set the security ID in a set of credentials * @new: The credentials to alter - * @secid: The LSM security ID to set + * @blob: The LSM security information to set * * Set the LSM security ID in a set of credentials so that the subjective * security is overridden when an alternative set of credentials is used. */ -int set_security_override(struct cred *new, u32 secid) +int set_security_override(struct cred *new, struct lsmblob *blob) { - return security_kernel_act_as(new, secid); + return security_kernel_act_as(new, blob); } EXPORT_SYMBOL(set_security_override); @@ -795,6 +795,7 @@ EXPORT_SYMBOL(set_security_override); */ int set_security_override_from_ctx(struct cred *new, const char *secctx) { + struct lsmblob blob; u32 secid; int ret; @@ -802,7 +803,8 @@ int set_security_override_from_ctx(struct cred *new, const char *secctx) if (ret < 0) return ret; - return set_security_override(new, secid); + lsmblob_init(&blob, secid); + return set_security_override(new, &blob); } EXPORT_SYMBOL(set_security_override_from_ctx); diff --git a/security/security.c b/security/security.c index 3ad3aa74c59d..171e2fe66e5e 100644 --- a/security/security.c +++ b/security/security.c @@ -1800,9 +1800,19 @@ void security_cred_getsecid(const struct cred *c, u32 *secid) } EXPORT_SYMBOL(security_cred_getsecid); -int security_kernel_act_as(struct cred *new, u32 secid) +int security_kernel_act_as(struct cred *new, struct lsmblob *blob) { - return call_int_hook(kernel_act_as, 0, new, secid); + struct security_hook_list *hp; + int rc; + + hlist_for_each_entry(hp, &security_hook_heads.kernel_act_as, list) { + if (WARN_ON(hp->lsmid->slot < 0 || hp->lsmid->slot >= lsm_slot)) + continue; + rc = hp->hook.kernel_act_as(new, blob->secid[hp->lsmid->slot]); + if (rc != 0) + return rc; + } + return 0; } int security_kernel_create_files_as(struct cred *new, struct inode *inode) -- 2.31.1
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, sds@tycho.nsa.gov Subject: [PATCH v31 07/28] LSM: Use lsmblob in security_kernel_act_as Date: Mon, 13 Dec 2021 15:40:13 -0800 [thread overview] Message-ID: <20211213234034.111891-8-casey@schaufler-ca.com> (raw) In-Reply-To: <20211213234034.111891-1-casey@schaufler-ca.com> Change the security_kernel_act_as interface to use a lsmblob structure in place of the single u32 secid in support of module stacking. Change its only caller, set_security_override, to do the same. Change that one's only caller, set_security_override_from_ctx, to call it with the new parameter type. The security module hook is unchanged, still taking a secid. The infrastructure passes the correct entry from the lsmblob. lsmblob_init() is used to fill the lsmblob structure, however this will be removed later in the series when security_secctx_to_secid() is updated to provide a lsmblob instead of a secid. Reviewed-by: Kees Cook <keescook@chromium.org> Reviewed-by: John Johansen <john.johansen@canonical.com> Acked-by: Stephen Smalley <stephen.smalley.work@gmail.com> Acked-by: Paul Moore <paul@paul-moore.com> Signed-off-by: Casey Schaufler <casey@schaufler-ca.com> To: David Howells <dhowells@redhat.com> --- include/linux/cred.h | 3 ++- include/linux/security.h | 5 +++-- kernel/cred.c | 10 ++++++---- security/security.c | 14 ++++++++++++-- 4 files changed, 23 insertions(+), 9 deletions(-) diff --git a/include/linux/cred.h b/include/linux/cred.h index fcbc6885cc09..eb02e8514239 100644 --- a/include/linux/cred.h +++ b/include/linux/cred.h @@ -18,6 +18,7 @@ struct cred; struct inode; +struct lsmblob; /* * COW Supplementary groups list @@ -165,7 +166,7 @@ extern const struct cred *override_creds(const struct cred *); extern void revert_creds(const struct cred *); extern struct cred *prepare_kernel_cred(struct task_struct *); extern int change_create_files_as(struct cred *, struct inode *); -extern int set_security_override(struct cred *, u32); +extern int set_security_override(struct cred *, struct lsmblob *); extern int set_security_override_from_ctx(struct cred *, const char *); extern int set_create_files_as(struct cred *, struct inode *); extern int cred_fscmp(const struct cred *, const struct cred *); diff --git a/include/linux/security.h b/include/linux/security.h index 5a29b9bfdeda..aaa63bf5026e 100644 --- a/include/linux/security.h +++ b/include/linux/security.h @@ -464,7 +464,7 @@ void security_cred_free(struct cred *cred); int security_prepare_creds(struct cred *new, const struct cred *old, gfp_t gfp); void security_transfer_creds(struct cred *new, const struct cred *old); void security_cred_getsecid(const struct cred *c, u32 *secid); -int security_kernel_act_as(struct cred *new, u32 secid); +int security_kernel_act_as(struct cred *new, struct lsmblob *blob); int security_kernel_create_files_as(struct cred *new, struct inode *inode); int security_kernel_module_request(char *kmod_name); int security_kernel_load_data(enum kernel_load_data_id id, bool contents); @@ -1112,7 +1112,8 @@ static inline void security_cred_getsecid(const struct cred *c, u32 *secid) *secid = 0; } -static inline int security_kernel_act_as(struct cred *cred, u32 secid) +static inline int security_kernel_act_as(struct cred *cred, + struct lsmblob *blob) { return 0; } diff --git a/kernel/cred.c b/kernel/cred.c index 473d17c431f3..e5e41bd4efc3 100644 --- a/kernel/cred.c +++ b/kernel/cred.c @@ -772,14 +772,14 @@ EXPORT_SYMBOL(prepare_kernel_cred); /** * set_security_override - Set the security ID in a set of credentials * @new: The credentials to alter - * @secid: The LSM security ID to set + * @blob: The LSM security information to set * * Set the LSM security ID in a set of credentials so that the subjective * security is overridden when an alternative set of credentials is used. */ -int set_security_override(struct cred *new, u32 secid) +int set_security_override(struct cred *new, struct lsmblob *blob) { - return security_kernel_act_as(new, secid); + return security_kernel_act_as(new, blob); } EXPORT_SYMBOL(set_security_override); @@ -795,6 +795,7 @@ EXPORT_SYMBOL(set_security_override); */ int set_security_override_from_ctx(struct cred *new, const char *secctx) { + struct lsmblob blob; u32 secid; int ret; @@ -802,7 +803,8 @@ int set_security_override_from_ctx(struct cred *new, const char *secctx) if (ret < 0) return ret; - return set_security_override(new, secid); + lsmblob_init(&blob, secid); + return set_security_override(new, &blob); } EXPORT_SYMBOL(set_security_override_from_ctx); diff --git a/security/security.c b/security/security.c index 3ad3aa74c59d..171e2fe66e5e 100644 --- a/security/security.c +++ b/security/security.c @@ -1800,9 +1800,19 @@ void security_cred_getsecid(const struct cred *c, u32 *secid) } EXPORT_SYMBOL(security_cred_getsecid); -int security_kernel_act_as(struct cred *new, u32 secid) +int security_kernel_act_as(struct cred *new, struct lsmblob *blob) { - return call_int_hook(kernel_act_as, 0, new, secid); + struct security_hook_list *hp; + int rc; + + hlist_for_each_entry(hp, &security_hook_heads.kernel_act_as, list) { + if (WARN_ON(hp->lsmid->slot < 0 || hp->lsmid->slot >= lsm_slot)) + continue; + rc = hp->hook.kernel_act_as(new, blob->secid[hp->lsmid->slot]); + if (rc != 0) + return rc; + } + return 0; } int security_kernel_create_files_as(struct cred *new, struct inode *inode) -- 2.31.1 -- Linux-audit mailing list Linux-audit@redhat.com https://listman.redhat.com/mailman/listinfo/linux-audit
next prev parent reply other threads:[~2021-12-13 23:48 UTC|newest] Thread overview: 74+ messages / expand[flat|nested] mbox.gz Atom feed top [not found] <20211213234034.111891-1-casey.ref@schaufler-ca.com> 2021-12-13 23:40 ` [PATCH v31 00/28] LSM: Module stacking for AppArmor Casey Schaufler 2021-12-13 23:40 ` Casey Schaufler 2021-12-13 23:40 ` [PATCH v31 01/28] integrity: disassociate ima_filter_rule from security_audit_rule Casey Schaufler 2021-12-13 23:40 ` Casey Schaufler 2021-12-14 13:33 ` kernel test robot 2021-12-14 13:33 ` kernel test robot 2021-12-14 13:33 ` kernel test robot 2021-12-13 23:40 ` [PATCH v31 02/28] LSM: Infrastructure management of the sock security Casey Schaufler 2021-12-13 23:40 ` Casey Schaufler 2021-12-13 23:40 ` [PATCH v31 03/28] LSM: Add the lsmblob data structure Casey Schaufler 2021-12-13 23:40 ` Casey Schaufler 2021-12-13 23:40 ` [PATCH v31 04/28] LSM: provide lsm name and id slot mappings Casey Schaufler 2021-12-13 23:40 ` Casey Schaufler 2021-12-13 23:40 ` [PATCH v31 05/28] IMA: avoid label collisions with stacked LSMs Casey Schaufler 2021-12-13 23:40 ` Casey Schaufler 2021-12-13 23:40 ` [PATCH v31 06/28] LSM: Use lsmblob in security_audit_rule_match Casey Schaufler 2021-12-13 23:40 ` Casey Schaufler 2021-12-13 23:40 ` Casey Schaufler [this message] 2021-12-13 23:40 ` [PATCH v31 07/28] LSM: Use lsmblob in security_kernel_act_as Casey Schaufler 2021-12-13 23:40 ` [PATCH v31 08/28] LSM: Use lsmblob in security_secctx_to_secid Casey Schaufler 2021-12-13 23:40 ` Casey Schaufler 2021-12-13 23:40 ` [PATCH v31 09/28] LSM: Use lsmblob in security_secid_to_secctx Casey Schaufler 2021-12-13 23:40 ` Casey Schaufler 2021-12-13 23:40 ` [PATCH v31 10/28] LSM: Use lsmblob in security_ipc_getsecid Casey Schaufler 2021-12-13 23:40 ` Casey Schaufler 2021-12-13 23:40 ` [PATCH v31 11/28] LSM: Use lsmblob in security_task_getsecid Casey Schaufler 2021-12-13 23:40 ` Casey Schaufler 2021-12-13 23:40 ` [PATCH v31 12/28] LSM: Use lsmblob in security_inode_getsecid Casey Schaufler 2021-12-13 23:40 ` Casey Schaufler 2021-12-13 23:40 ` [PATCH v31 13/28] LSM: Use lsmblob in security_cred_getsecid Casey Schaufler 2021-12-13 23:40 ` Casey Schaufler 2021-12-15 9:14 ` kernel test robot 2021-12-15 9:14 ` kernel test robot 2021-12-15 9:14 ` kernel test robot 2021-12-13 23:40 ` [PATCH v31 14/28] LSM: Specify which LSM to display Casey Schaufler 2021-12-13 23:40 ` Casey Schaufler 2021-12-14 18:38 ` Christian Göttsche 2021-12-14 18:38 ` Christian Göttsche 2021-12-14 18:49 ` Casey Schaufler 2021-12-14 18:49 ` Casey Schaufler 2021-12-13 23:40 ` [PATCH v31 15/28] LSM: Ensure the correct LSM context releaser Casey Schaufler 2021-12-13 23:40 ` Casey Schaufler 2021-12-13 23:40 ` [PATCH v31 16/28] LSM: Use lsmcontext in security_secid_to_secctx Casey Schaufler 2021-12-13 23:40 ` Casey Schaufler 2021-12-13 23:40 ` [PATCH v31 17/28] LSM: Use lsmcontext in security_inode_getsecctx Casey Schaufler 2021-12-13 23:40 ` Casey Schaufler 2021-12-13 23:40 ` [PATCH v31 18/28] LSM: security_secid_to_secctx in netlink netfilter Casey Schaufler 2021-12-13 23:40 ` Casey Schaufler 2021-12-13 23:40 ` [PATCH v31 19/28] NET: Store LSM netlabel data in a lsmblob Casey Schaufler 2021-12-13 23:40 ` Casey Schaufler 2021-12-13 23:40 ` [PATCH v31 20/28] binder: Pass LSM identifier for confirmation Casey Schaufler 2021-12-13 23:40 ` Casey Schaufler 2021-12-13 23:40 ` [PATCH v31 21/28] LSM: Extend security_secid_to_secctx to include module selection Casey Schaufler 2021-12-13 23:40 ` Casey Schaufler 2021-12-13 23:40 ` [PATCH v31 22/28] Audit: Keep multiple LSM data in audit_names Casey Schaufler 2021-12-13 23:40 ` Casey Schaufler 2021-12-13 23:40 ` [PATCH v31 23/28] Audit: Create audit_stamp structure Casey Schaufler 2021-12-13 23:40 ` Casey Schaufler 2021-12-13 23:40 ` [PATCH v31 24/28] Audit: Add framework for auxiliary records Casey Schaufler 2021-12-13 23:40 ` Casey Schaufler 2021-12-13 23:40 ` [PATCH v31 25/28] Audit: Add record for multiple task security contexts Casey Schaufler 2021-12-13 23:40 ` Casey Schaufler 2021-12-13 23:40 ` [PATCH v31 26/28] Audit: Add record for multiple object " Casey Schaufler 2021-12-13 23:40 ` Casey Schaufler 2021-12-14 13:12 ` kernel test robot 2021-12-14 13:12 ` kernel test robot 2021-12-14 13:12 ` kernel test robot 2021-12-14 13:22 ` kernel test robot 2021-12-14 13:22 ` kernel test robot 2021-12-14 13:22 ` kernel test robot 2021-12-13 23:40 ` [PATCH v31 27/28] LSM: Add /proc attr entry for full LSM context Casey Schaufler 2021-12-13 23:40 ` Casey Schaufler 2021-12-13 23:40 ` [PATCH v31 28/28] AppArmor: Remove the exclusive flag Casey Schaufler 2021-12-13 23:40 ` Casey Schaufler
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