Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 191 insertions, 0 deletions

diff --git a/security/keys/user_defined.c b/security/keys/user_defined.c
new file mode 100644
index 000000000000..8d65b3a28129
--- /dev/null
+++ b/security/keys/user_defined.c
@@ -0,0 +1,191 @@
+/* user_defined.c: user defined key type
+ *
+ * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/seq_file.h>
+#include <linux/err.h>
+#include <asm/uaccess.h>
+#include "internal.h"
+
+static int user_instantiate(struct key *key, const void *data, size_t datalen);
+static int user_duplicate(struct key *key, const struct key *source);
+static int user_update(struct key *key, const void *data, size_t datalen);
+static int user_match(const struct key *key, const void *criterion);
+static void user_destroy(struct key *key);
+static void user_describe(const struct key *user, struct seq_file *m);
+static long user_read(const struct key *key,
+                      char __user *buffer, size_t buflen);
+
+/*
+ * user defined keys take an arbitrary string as the description and an
+ * arbitrary blob of data as the payload
+ */
+struct key_type key_type_user = {
+        .name           = "user",
+        .instantiate    = user_instantiate,
+        .duplicate      = user_duplicate,
+        .update         = user_update,
+        .match          = user_match,
+        .destroy        = user_destroy,
+        .describe       = user_describe,
+        .read           = user_read,
+};
+
+/*****************************************************************************/
+/*
+ * instantiate a user defined key
+ */
+static int user_instantiate(struct key *key, const void *data, size_t datalen)
+{
+        int ret;
+
+        ret = -EINVAL;
+        if (datalen <= 0 || datalen > 32767 || !data)
+                goto error;
+
+        ret = key_payload_reserve(key, datalen);
+        if (ret < 0)
+                goto error;
+
+        /* attach the data */
+        ret = -ENOMEM;
+        key->payload.data = kmalloc(datalen, GFP_KERNEL);
+        if (!key->payload.data)
+                goto error;
+
+        memcpy(key->payload.data, data, datalen);
+        ret = 0;
+
+ error:
+        return ret;
+
+} /* end user_instantiate() */
+
+/*****************************************************************************/
+/*
+ * duplicate a user defined key
+ */
+static int user_duplicate(struct key *key, const struct key *source)
+{
+        int ret;
+
+        /* just copy the payload */
+        ret = -ENOMEM;
+        key->payload.data = kmalloc(source->datalen, GFP_KERNEL);
+
+        if (key->payload.data) {
+                key->datalen = source->datalen;
+                memcpy(key->payload.data, source->payload.data, source->datalen);
+                ret = 0;
+        }
+
+        return ret;
+
+} /* end user_duplicate() */
+
+/*****************************************************************************/
+/*
+ * update a user defined key
+ */
+static int user_update(struct key *key, const void *data, size_t datalen)
+{
+        void *new, *zap;
+        int ret;
+
+        ret = -EINVAL;
+        if (datalen <= 0 || datalen > 32767 || !data)
+                goto error;
+
+        /* copy the data */
+        ret = -ENOMEM;
+        new = kmalloc(datalen, GFP_KERNEL);
+        if (!new)
+                goto error;
+
+        memcpy(new, data, datalen);
+
+        /* check the quota and attach the new data */
+        zap = new;
+        write_lock(&key->lock);
+
+        ret = key_payload_reserve(key, datalen);
+
+        if (ret == 0) {
+                /* attach the new data, displacing the old */
+                zap = key->payload.data;
+                key->payload.data = new;
+                key->expiry = 0;
+        }
+
+        write_unlock(&key->lock);
+        kfree(zap);
+
+ error:
+        return ret;
+
+} /* end user_update() */
+
+/*****************************************************************************/
+/*
+ * match users on their name
+ */
+static int user_match(const struct key *key, const void *description)
+{
+        return strcmp(key->description, description) == 0;
+
+} /* end user_match() */
+
+/*****************************************************************************/
+/*
+ * dispose of the data dangling from the corpse of a user
+ */
+static void user_destroy(struct key *key)
+{
+        kfree(key->payload.data);
+
+} /* end user_destroy() */
+
+/*****************************************************************************/
+/*
+ * describe the user
+ */
+static void user_describe(const struct key *key, struct seq_file *m)
+{
+        seq_puts(m, key->description);
+
+        seq_printf(m, ": %u", key->datalen);
+
+} /* end user_describe() */
+
+/*****************************************************************************/
+/*
+ * read the key data
+ */
+static long user_read(const struct key *key,
+                      char __user *buffer, size_t buflen)
+{
+        long ret = key->datalen;
+
+        /* we can return the data as is */
+        if (buffer && buflen > 0) {
+                if (buflen > key->datalen)
+                        buflen = key->datalen;
+
+                if (copy_to_user(buffer, key->payload.data, buflen) != 0)
+                        ret = -EFAULT;
+        }
+
+        return ret;
+
+} /* end user_read() */