Merge branch 'linus' into test

Conflicts:
	MAINTAINERS
	arch/x86/kernel/acpi/boot.c
	arch/x86/kernel/acpi/sleep.c
	drivers/acpi/Kconfig
	drivers/pnp/Makefile
	drivers/pnp/quirks.c

Signed-off-by: Len Brown <len.brown@intel.com>

4 files changed, 109 insertions, 3 deletions

diff --git a/security/smack/smack.h b/security/smack/smack.h
index 4a4477f5afd..31dce559595 100644
--- a/security/smack/smack.h
+++ b/security/smack/smack.h
@@ -178,6 +178,7 @@ u32 smack_to_secid(const char *);
 extern int smack_cipso_direct;
 extern int smack_net_nltype;
 extern char *smack_net_ambient;
+extern char *smack_onlycap;
 
 extern struct smack_known *smack_known;
 extern struct smack_known smack_known_floor;
diff --git a/security/smack/smack_access.c b/security/smack/smack_access.c
index f6b5f6eed6d..79ff21ed4c3 100644
--- a/security/smack/smack_access.c
+++ b/security/smack/smack_access.c
@@ -157,7 +157,7 @@ int smk_access(char *subject_label, char *object_label, int request)
  *
  * This function checks the current subject label/object label pair
  * in the access rule list and returns 0 if the access is permitted,
- * non zero otherwise. It allows that current my have the capability
+ * non zero otherwise. It allows that current may have the capability
  * to override the rules.
  */
 int smk_curacc(char *obj_label, u32 mode)
@@ -168,6 +168,14 @@ int smk_curacc(char *obj_label, u32 mode)
 	if (rc == 0)
 		return 0;
 
+	/*
+	 * Return if a specific label has been designated as the
+	 * only one that gets privilege and current does not
+	 * have that label.
+	 */
+	if (smack_onlycap != NULL && smack_onlycap != current->security)
+		return rc;
+
 	if (capable(CAP_MAC_OVERRIDE))
 		return 0;
 
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index 87d75417ea9..6e2dc0bab70 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -2179,7 +2179,10 @@ static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
 	 * This is the simplist possible security model
 	 * for networking.
 	 */
-	return smk_access(smack, ssp->smk_in, MAY_WRITE);
+	rc = smk_access(smack, ssp->smk_in, MAY_WRITE);
+	if (rc != 0)
+		netlbl_skbuff_err(skb, rc, 0);
+	return rc;
 }
 
 /**
diff --git a/security/smack/smackfs.c b/security/smack/smackfs.c
index 271a835fbbe..c21d8c8bf0c 100644
--- a/security/smack/smackfs.c
+++ b/security/smack/smackfs.c
@@ -39,6 +39,7 @@ enum smk_inos {
 	SMK_DIRECT	= 6,	/* CIPSO level indicating direct label */
 	SMK_AMBIENT	= 7,	/* internet ambient label */
 	SMK_NLTYPE	= 8,	/* label scheme to use by default */
+	SMK_ONLYCAP	= 9,	/* the only "capable" label */
 };
 
 /*
@@ -68,6 +69,16 @@ int smack_net_nltype = NETLBL_NLTYPE_CIPSOV4;
  */
 int smack_cipso_direct = SMACK_CIPSO_DIRECT_DEFAULT;
 
+/*
+ * Unless a process is running with this label even
+ * having CAP_MAC_OVERRIDE isn't enough to grant
+ * privilege to violate MAC policy. If no label is
+ * designated (the NULL case) capabilities apply to
+ * everyone. It is expected that the hat (^) label
+ * will be used if any label is used.
+ */
+char *smack_onlycap;
+
 static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT;
 struct smk_list_entry *smack_list;
 
@@ -343,9 +354,11 @@ static void smk_cipso_doi(void)
 		doip->tags[rc] = CIPSO_V4_TAG_INVALID;
 
 	rc = netlbl_cfg_cipsov4_add_map(doip, NULL, &audit_info);
-	if (rc != 0)
+	if (rc != 0) {
 		printk(KERN_WARNING "%s:%d add rc = %d\n",
 		       __func__, __LINE__, rc);
+		kfree(doip);
+	}
 }
 
 /**
@@ -787,6 +800,85 @@ static const struct file_operations smk_ambient_ops = {
 	.write		= smk_write_ambient,
 };
 
+/**
+ * smk_read_onlycap - read() for /smack/onlycap
+ * @filp: file pointer, not actually used
+ * @buf: where to put the result
+ * @cn: maximum to send along
+ * @ppos: where to start
+ *
+ * Returns number of bytes read or error code, as appropriate
+ */
+static ssize_t smk_read_onlycap(struct file *filp, char __user *buf,
+				size_t cn, loff_t *ppos)
+{
+	char *smack = "";
+	ssize_t rc = -EINVAL;
+	int asize;
+
+	if (*ppos != 0)
+		return 0;
+
+	if (smack_onlycap != NULL)
+		smack = smack_onlycap;
+
+	asize = strlen(smack) + 1;
+
+	if (cn >= asize)
+		rc = simple_read_from_buffer(buf, cn, ppos, smack, asize);
+
+	return rc;
+}
+
+/**
+ * smk_write_onlycap - write() for /smack/onlycap
+ * @filp: file pointer, not actually used
+ * @buf: where to get the data from
+ * @count: bytes sent
+ * @ppos: where to start
+ *
+ * Returns number of bytes written or error code, as appropriate
+ */
+static ssize_t smk_write_onlycap(struct file *file, const char __user *buf,
+				 size_t count, loff_t *ppos)
+{
+	char in[SMK_LABELLEN];
+	char *sp = current->security;
+
+	if (!capable(CAP_MAC_ADMIN))
+		return -EPERM;
+
+	/*
+	 * This can be done using smk_access() but is done
+	 * explicitly for clarity. The smk_access() implementation
+	 * would use smk_access(smack_onlycap, MAY_WRITE)
+	 */
+	if (smack_onlycap != NULL && smack_onlycap != sp)
+		return -EPERM;
+
+	if (count >= SMK_LABELLEN)
+		return -EINVAL;
+
+	if (copy_from_user(in, buf, count) != 0)
+		return -EFAULT;
+
+	/*
+	 * Should the null string be passed in unset the onlycap value.
+	 * This seems like something to be careful with as usually
+	 * smk_import only expects to return NULL for errors. It
+	 * is usually the case that a nullstring or "\n" would be
+	 * bad to pass to smk_import but in fact this is useful here.
+	 */
+	smack_onlycap = smk_import(in, count);
+
+	return count;
+}
+
+static const struct file_operations smk_onlycap_ops = {
+	.read		= smk_read_onlycap,
+	.write		= smk_write_onlycap,
+};
+
 struct option_names {
 	int	o_number;
 	char	*o_name;
@@ -919,6 +1011,8 @@ static int smk_fill_super(struct super_block *sb, void *data, int silent)
 			{"ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR},
 		[SMK_NLTYPE]	=
 			{"nltype", &smk_nltype_ops, S_IRUGO|S_IWUSR},
+		[SMK_ONLYCAP]	=
+			{"onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR},
 		/* last one */ {""}
 	};