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-rw-r--r--security/smack/smackfs.c97
1 files changed, 96 insertions, 1 deletions
diff --git a/security/smack/smackfs.c b/security/smack/smackfs.c
index bce4e8f1b267..06f719ed63c9 100644
--- a/security/smack/smackfs.c
+++ b/security/smack/smackfs.c
@@ -54,6 +54,9 @@ enum smk_inos {
SMK_CHANGE_RULE = 19, /* change or add rules (long labels) */
SMK_SYSLOG = 20, /* change syslog label) */
SMK_PTRACE = 21, /* set ptrace rule */
+#ifdef CONFIG_SECURITY_SMACK_BRINGUP
+ SMK_UNCONFINED = 22, /* define an unconfined label */
+#endif
};
/*
@@ -61,7 +64,6 @@ enum smk_inos {
*/
static DEFINE_MUTEX(smack_cipso_lock);
static DEFINE_MUTEX(smack_ambient_lock);
-static DEFINE_MUTEX(smack_syslog_lock);
static DEFINE_MUTEX(smk_netlbladdr_lock);
/*
@@ -95,6 +97,16 @@ int smack_cipso_mapped = SMACK_CIPSO_MAPPED_DEFAULT;
*/
struct smack_known *smack_onlycap;
+#ifdef CONFIG_SECURITY_SMACK_BRINGUP
+/*
+ * Allow one label to be unconfined. This is for
+ * debugging and application bring-up purposes only.
+ * It is bad and wrong, but everyone seems to expect
+ * to have it.
+ */
+struct smack_known *smack_unconfined;
+#endif
+
/*
* If this value is set restrict syslog use to the label specified.
* It can be reset via smackfs/syslog
@@ -1717,6 +1729,85 @@ static const struct file_operations smk_onlycap_ops = {
.llseek = default_llseek,
};
+#ifdef CONFIG_SECURITY_SMACK_BRINGUP
+/**
+ * smk_read_unconfined - read() for smackfs/unconfined
+ * @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_unconfined(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_unconfined != NULL)
+ smack = smack_unconfined->smk_known;
+
+ asize = strlen(smack) + 1;
+
+ if (cn >= asize)
+ rc = simple_read_from_buffer(buf, cn, ppos, smack, asize);
+
+ return rc;
+}
+
+/**
+ * smk_write_unconfined - write() for smackfs/unconfined
+ * @file: 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_unconfined(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ char *data;
+ int rc = count;
+
+ if (!smack_privileged(CAP_MAC_ADMIN))
+ return -EPERM;
+
+ data = kzalloc(count + 1, GFP_KERNEL);
+ if (data == NULL)
+ return -ENOMEM;
+
+ /*
+ * Should the null string be passed in unset the unconfined 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.
+ *
+ * smk_import will also reject a label beginning with '-',
+ * so "-confine" will also work.
+ */
+ if (copy_from_user(data, buf, count) != 0)
+ rc = -EFAULT;
+ else
+ smack_unconfined = smk_import_entry(data, count);
+
+ kfree(data);
+ return rc;
+}
+
+static const struct file_operations smk_unconfined_ops = {
+ .read = smk_read_unconfined,
+ .write = smk_write_unconfined,
+ .llseek = default_llseek,
+};
+#endif /* CONFIG_SECURITY_SMACK_BRINGUP */
+
/**
* smk_read_logging - read() for /smack/logging
* @filp: file pointer, not actually used
@@ -2384,6 +2475,10 @@ static int smk_fill_super(struct super_block *sb, void *data, int silent)
"syslog", &smk_syslog_ops, S_IRUGO|S_IWUSR},
[SMK_PTRACE] = {
"ptrace", &smk_ptrace_ops, S_IRUGO|S_IWUSR},
+#ifdef CONFIG_SECURITY_SMACK_BRINGUP
+ [SMK_UNCONFINED] = {
+ "unconfined", &smk_unconfined_ops, S_IRUGO|S_IWUSR},
+#endif
/* last one */
{""}
};