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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, keescook@chromium.org,
	john.johansen@canonical.com, penguin-kernel@i-love.sakura.ne.jp,
	paul@paul-moore.com, sds@tycho.nsa.gov
Subject: [PATCH v7 27/28] LSM: Add /proc attr entry for full LSM context
Date: Wed,  7 Aug 2019 12:44:09 -0700
Message-ID: <20190807194410.9762-28-casey@schaufler-ca.com> (raw)
In-Reply-To: <20190807194410.9762-1-casey@schaufler-ca.com>

Add an entry /proc/.../attr/context which displays the full
process security "context" in compound format:'
	lsm1\0value\0lsm2\0value\0...
This entry is not writable.

Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
---
 fs/proc/base.c      |  1 +
 security/security.c | 45 +++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 46 insertions(+)

diff --git a/fs/proc/base.c b/fs/proc/base.c
index 7bf70e041315..79600df5f7a2 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -2619,6 +2619,7 @@ static const struct pid_entry attr_dir_stuff[] = {
 	ATTR(NULL, "keycreate",		0666),
 	ATTR(NULL, "sockcreate",	0666),
 	ATTR(NULL, "display",		0666),
+	ATTR(NULL, "context",		0666),
 #ifdef CONFIG_SECURITY_SMACK
 	DIR("smack",			0555,
 	    proc_smack_attr_dir_inode_ops, proc_smack_attr_dir_ops),
diff --git a/security/security.c b/security/security.c
index 0ea7ee27e331..e9f579483d12 100644
--- a/security/security.c
+++ b/security/security.c
@@ -2046,6 +2046,14 @@ int security_getprocattr(struct task_struct *p, const char *lsm, char *name,
 				char **value)
 {
 	struct security_hook_list *hp;
+	char *final = NULL;
+	char *cp;
+	char *tp;
+	int rc = 0;
+	int finallen = 0;
+	int llen;
+	int clen;
+	int tlen;
 	int display = lsm_task_display(current);
 	int slot = 0;
 
@@ -2063,6 +2071,43 @@ int security_getprocattr(struct task_struct *p, const char *lsm, char *name,
 		return -ENOMEM;
 	}
 
+	if (!strcmp(name, "context")) {
+		hlist_for_each_entry(hp, &security_hook_heads.getprocattr,
+				     list) {
+			rc = hp->hook.getprocattr(p, "current", &cp);
+			if (rc == -EINVAL || rc == -ENOPROTOOPT)
+				continue;
+			if (rc < 0) {
+				kfree(final);
+				return rc;
+			}
+			llen = strlen(hp->lsmid->lsm) + 1;
+			clen = strlen(cp) + 1;
+			tlen = llen + clen;
+			if (final)
+				tlen += finallen;
+			tp = kzalloc(tlen, GFP_KERNEL);
+			if (tp == NULL) {
+				kfree(cp);
+				kfree(final);
+				return -ENOMEM;
+			}
+			if (final)
+				memcpy(tp, final, finallen);
+			memcpy(tp + finallen, hp->lsmid->lsm, llen);
+			memcpy(tp + finallen + llen, cp, clen);
+			kfree(cp);
+			if (final)
+				kfree(final);
+			final = tp;
+			finallen = tlen;
+		}
+		if (final == NULL)
+			return -EINVAL;
+		*value = final;
+		return finallen;
+	}
+
 	hlist_for_each_entry(hp, &security_hook_heads.getprocattr, list) {
 		if (lsm != NULL && strcmp(lsm, hp->lsmid->lsm))
 			continue;
-- 
2.20.1


  parent reply index

Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-07 19:43 [PATCH v7 00/28] LSM: Module stacking for AppArmor Casey Schaufler
2019-08-07 19:43 ` [PATCH v7 01/28] LSM: Infrastructure management of the superblock Casey Schaufler
2019-08-07 19:43 ` [PATCH v7 02/28] LSM: Infrastructure management of the sock security Casey Schaufler
2019-08-07 19:43 ` [PATCH v7 03/28] LSM: Infrastructure management of the key blob Casey Schaufler
2019-08-07 19:43 ` [PATCH v7 04/28] LSM: Create and manage the lsmblob data structure Casey Schaufler
2019-08-07 19:43 ` [PATCH v7 05/28] LSM: Use lsmblob in security_audit_rule_match Casey Schaufler
2019-08-07 19:43 ` [PATCH v7 06/28] LSM: Use lsmblob in security_kernel_act_as Casey Schaufler
2019-08-07 19:43 ` [PATCH v7 07/28] net: Prepare UDS for security module stacking Casey Schaufler
2019-08-07 19:43 ` [PATCH v7 08/28] LSM: Use lsmblob in security_secctx_to_secid Casey Schaufler
2019-08-07 19:43 ` [PATCH v7 09/28] LSM: Use lsmblob in security_secid_to_secctx Casey Schaufler
2019-08-07 19:43 ` [PATCH v7 10/28] LSM: Use lsmblob in security_ipc_getsecid Casey Schaufler
2019-08-07 19:43 ` [PATCH v7 11/28] LSM: Use lsmblob in security_task_getsecid Casey Schaufler
2019-08-07 19:43 ` [PATCH v7 12/28] LSM: Use lsmblob in security_inode_getsecid Casey Schaufler
2019-08-07 19:43 ` [PATCH v7 13/28] LSM: Use lsmblob in security_cred_getsecid Casey Schaufler
2019-08-07 19:43 ` [PATCH v7 14/28] IMA: Change internal interfaces to use lsmblobs Casey Schaufler
2019-08-07 19:43 ` [PATCH v7 15/28] LSM: Specify which LSM to display Casey Schaufler
2019-08-08 21:39   ` Kees Cook
2019-08-08 23:38     ` Casey Schaufler
2019-08-07 19:43 ` [PATCH v7 16/28] LSM: Ensure the correct LSM context releaser Casey Schaufler
2019-08-07 19:43 ` [PATCH v7 17/28] LSM: Use lsmcontext in security_secid_to_secctx Casey Schaufler
2019-08-07 19:44 ` [PATCH v7 18/28] LSM: Use lsmcontext in security_dentry_init_security Casey Schaufler
2019-08-07 19:44 ` [PATCH v7 19/28] LSM: Use lsmcontext in security_inode_getsecctx Casey Schaufler
2019-08-07 19:44 ` [PATCH v7 20/28] LSM: security_secid_to_secctx in netlink netfilter Casey Schaufler
2019-08-07 19:44 ` [PATCH v7 21/28] NET: Store LSM netlabel data in a lsmblob Casey Schaufler
2019-08-07 19:44 ` [PATCH v7 22/28] SELinux: Verify LSM display sanity in binder Casey Schaufler
2019-08-08 21:55   ` Kees Cook
2019-08-09  0:56     ` Casey Schaufler
2019-08-07 19:44 ` [PATCH v7 23/28] Audit: Add subj_LSM fields when necessary Casey Schaufler
2019-08-07 19:44 ` [PATCH v7 24/28] Audit: Include object data for all security modules Casey Schaufler
2019-08-07 19:44 ` [PATCH v7 25/28] LSM: Provide an user space interface for the default display Casey Schaufler
2019-08-07 19:44 ` [PATCH v7 26/28] NET: Add SO_PEERCONTEXT for multiple LSMs Casey Schaufler
2019-08-08 22:21   ` Kees Cook
2019-08-09  0:18     ` Casey Schaufler
2019-08-07 19:44 ` Casey Schaufler [this message]
2019-08-08 22:22   ` [PATCH v7 27/28] LSM: Add /proc attr entry for full LSM context Kees Cook
2019-08-09  0:23     ` Casey Schaufler
2019-08-07 19:44 ` [PATCH v7 28/28] AppArmor: Remove the exclusive flag Casey Schaufler

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