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From: John Johansen <john.johansen@canonical.com>
To: Casey Schaufler <casey@schaufler-ca.com>,
	casey.schaufler@intel.com, jmorris@namei.org,
	linux-security-module@vger.kernel.org, selinux@vger.kernel.org
Cc: keescook@chromium.org, penguin-kernel@i-love.sakura.ne.jp,
	paul@paul-moore.com, sds@tycho.nsa.gov
Subject: Re: [PATCH v11 10/25] LSM: Use lsmblob in security_inode_getsecid
Date: Thu, 21 Nov 2019 10:44:08 -0800
Message-ID: <b1d20b58-105d-3171-c7d3-9c590c309443@canonical.com> (raw)
In-Reply-To: <20191113181925.2437-11-casey@schaufler-ca.com>

On 11/13/19 10:19 AM, Casey Schaufler wrote:
> Change the security_inode_getsecid() interface to fill in a
> lsmblob structure instead of a u32 secid. This allows for its
> callers to gather data from all registered LSMs. Data is provided
> for IMA and audit.
> 
> Reviewed-by: Kees Cook <keescook@chromium.org>
> Reviewed-by: John Johansen <john.johansen@canonical.com>
> Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
> cc: linux-integrity@vger.kernel.org

Acked-by: John Johansen <john.johansen@canonical.com>


> ---
>  include/linux/security.h            |  7 ++++---
>  kernel/auditsc.c                    |  6 +++++-
>  security/integrity/ima/ima_policy.c |  4 +---
>  security/security.c                 | 11 +++++++++--
>  4 files changed, 19 insertions(+), 9 deletions(-)
> 
> diff --git a/include/linux/security.h b/include/linux/security.h
> index 67f95a335b5d..a845254fc415 100644
> --- a/include/linux/security.h
> +++ b/include/linux/security.h
> @@ -407,7 +407,7 @@ int security_inode_killpriv(struct dentry *dentry);
>  int security_inode_getsecurity(struct inode *inode, const char *name, void **buffer, bool alloc);
>  int security_inode_setsecurity(struct inode *inode, const char *name, const void *value, size_t size, int flags);
>  int security_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size);
> -void security_inode_getsecid(struct inode *inode, u32 *secid);
> +void security_inode_getsecid(struct inode *inode, struct lsmblob *blob);
>  int security_inode_copy_up(struct dentry *src, struct cred **new);
>  int security_inode_copy_up_xattr(const char *name);
>  int security_kernfs_init_security(struct kernfs_node *kn_dir,
> @@ -922,9 +922,10 @@ static inline int security_inode_listsecurity(struct inode *inode, char *buffer,
>  	return 0;
>  }
>  
> -static inline void security_inode_getsecid(struct inode *inode, u32 *secid)
> +static inline void security_inode_getsecid(struct inode *inode,
> +					   struct lsmblob *blob)
>  {
> -	*secid = 0;
> +	lsmblob_init(blob, 0);
>  }
>  
>  static inline int security_inode_copy_up(struct dentry *src, struct cred **new)
> diff --git a/kernel/auditsc.c b/kernel/auditsc.c
> index cccb681ad081..5752e51883d5 100644
> --- a/kernel/auditsc.c
> +++ b/kernel/auditsc.c
> @@ -1931,13 +1931,17 @@ static void audit_copy_inode(struct audit_names *name,
>  			     const struct dentry *dentry,
>  			     struct inode *inode, unsigned int flags)
>  {
> +	struct lsmblob blob;
> +
>  	name->ino   = inode->i_ino;
>  	name->dev   = inode->i_sb->s_dev;
>  	name->mode  = inode->i_mode;
>  	name->uid   = inode->i_uid;
>  	name->gid   = inode->i_gid;
>  	name->rdev  = inode->i_rdev;
> -	security_inode_getsecid(inode, &name->osid);
> +	security_inode_getsecid(inode, &blob);
> +	/* scaffolding until osid is updated */
> +	name->osid = blob.secid[0];
>  	if (flags & AUDIT_INODE_NOEVAL) {
>  		name->fcap_ver = -1;
>  		return;
> diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c
> index 7711cc6a3fe3..c5417045e165 100644
> --- a/security/integrity/ima/ima_policy.c
> +++ b/security/integrity/ima/ima_policy.c
> @@ -413,7 +413,6 @@ static bool ima_match_rules(struct ima_rule_entry *rule, struct inode *inode,
>  		return false;
>  	for (i = 0; i < MAX_LSM_RULES; i++) {
>  		int rc = 0;
> -		u32 osid;
>  		struct lsmblob blob;
>  
>  		if (!rule->lsm[i].rule)
> @@ -423,8 +422,7 @@ static bool ima_match_rules(struct ima_rule_entry *rule, struct inode *inode,
>  		case LSM_OBJ_USER:
>  		case LSM_OBJ_ROLE:
>  		case LSM_OBJ_TYPE:
> -			security_inode_getsecid(inode, &osid);
> -			lsmblob_init(&blob, osid);
> +			security_inode_getsecid(inode, &blob);
>  			rc = security_filter_rule_match(&blob,
>  							rule->lsm[i].type,
>  							Audit_equal,
> diff --git a/security/security.c b/security/security.c
> index e1f216d453bf..bd279a24adfc 100644
> --- a/security/security.c
> +++ b/security/security.c
> @@ -1386,9 +1386,16 @@ int security_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer
>  }
>  EXPORT_SYMBOL(security_inode_listsecurity);
>  
> -void security_inode_getsecid(struct inode *inode, u32 *secid)
> +void security_inode_getsecid(struct inode *inode, struct lsmblob *blob)
>  {
> -	call_void_hook(inode_getsecid, inode, secid);
> +	struct security_hook_list *hp;
> +
> +	lsmblob_init(blob, 0);
> +	hlist_for_each_entry(hp, &security_hook_heads.inode_getsecid, list) {
> +		if (WARN_ON(hp->lsmid->slot < 0 || hp->lsmid->slot >= lsm_slot))
> +			continue;
> +		hp->hook.inode_getsecid(inode, &blob->secid[hp->lsmid->slot]);
> +	}
>  }
>  
>  int security_inode_copy_up(struct dentry *src, struct cred **new)
> 


  reply index

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20191113181925.2437-1-casey.ref@schaufler-ca.com>
2019-11-13 18:19 ` [PATCH v11 00/25] LSM: Module stacking for AppArmor Casey Schaufler
2019-11-13 18:19   ` [PATCH v11 01/25] LSM: Infrastructure management of the sock security Casey Schaufler
2019-11-21 18:39     ` John Johansen
2019-11-13 18:19   ` [PATCH v11 02/25] LSM: Create and manage the lsmblob data structure Casey Schaufler
2019-11-21 18:40     ` John Johansen
2019-11-13 18:19   ` [PATCH v11 03/25] LSM: Use lsmblob in security_audit_rule_match Casey Schaufler
2019-11-21 18:40     ` John Johansen
2019-11-13 18:19   ` [PATCH v11 04/25] LSM: Use lsmblob in security_kernel_act_as Casey Schaufler
2019-11-21 18:41     ` John Johansen
2019-11-13 18:19   ` [PATCH v11 05/25] net: Prepare UDS for security module stacking Casey Schaufler
2019-11-21 18:41     ` John Johansen
2019-11-13 18:19   ` [PATCH v11 06/25] LSM: Use lsmblob in security_secctx_to_secid Casey Schaufler
2019-11-21 18:42     ` John Johansen
2019-11-13 18:19   ` [PATCH v11 07/25] LSM: Use lsmblob in security_secid_to_secctx Casey Schaufler
2019-11-21 18:42     ` John Johansen
2019-11-13 18:19   ` [PATCH v11 08/25] LSM: Use lsmblob in security_ipc_getsecid Casey Schaufler
2019-11-21 18:43     ` John Johansen
2019-11-13 18:19   ` [PATCH v11 09/25] LSM: Use lsmblob in security_task_getsecid Casey Schaufler
2019-11-21 18:43     ` John Johansen
2019-11-13 18:19   ` [PATCH v11 10/25] LSM: Use lsmblob in security_inode_getsecid Casey Schaufler
2019-11-21 18:44     ` John Johansen [this message]
2019-11-13 18:19   ` [PATCH v11 11/25] LSM: Use lsmblob in security_cred_getsecid Casey Schaufler
2019-11-21 18:44     ` John Johansen
2019-11-13 18:19   ` [PATCH v11 12/25] IMA: Change internal interfaces to use lsmblobs Casey Schaufler
2019-11-21 18:45     ` John Johansen
2019-11-13 18:19   ` [PATCH v11 13/25] LSM: Specify which LSM to display Casey Schaufler
2019-11-13 18:19   ` [PATCH v11 14/25] LSM: Ensure the correct LSM context releaser Casey Schaufler
2019-11-21 19:00     ` John Johansen
2019-11-13 18:19   ` [PATCH v11 15/25] LSM: Use lsmcontext in security_secid_to_secctx Casey Schaufler
2019-11-13 18:19   ` [PATCH v11 16/25] LSM: Use lsmcontext in security_dentry_init_security Casey Schaufler
2019-11-21 19:00     ` John Johansen
2019-11-13 18:19   ` [PATCH v11 17/25] LSM: Use lsmcontext in security_inode_getsecctx Casey Schaufler
2019-11-13 17:56 [PATCH v11 00/25] LSM: Module stacking for AppArmor Casey Schaufler
2019-11-13 17:57 ` [PATCH v11 10/25] LSM: Use lsmblob in security_inode_getsecid Casey Schaufler
  -- strict thread matches above, loose matches on Subject: below --
2019-11-13 16:50 [PATCH v11 00/25] LSM: Module stacking for AppArmor Casey Schaufler
2019-11-13 16:50 ` [PATCH v11 10/25] LSM: Use lsmblob in security_inode_getsecid Casey Schaufler

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