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, 127 insertions, 0 deletions

diff --git a/ipc/msgutil.c b/ipc/msgutil.c
new file mode 100644
index 000000000000..66cfb87646eb
--- /dev/null
+++ b/ipc/msgutil.c
@@ -0,0 +1,127 @@
+/*
+ * linux/ipc/util.c
+ * Copyright (C) 1999, 2004 Manfred Spraul
+ *
+ * This file is released under GNU General Public Licence version 2 or
+ * (at your option) any later version.
+ *
+ * See the file COPYING for more details.
+ */
+
+#include <linux/spinlock.h>
+#include <linux/init.h>
+#include <linux/security.h>
+#include <linux/slab.h>
+#include <linux/ipc.h>
+#include <asm/uaccess.h>
+
+#include "util.h"
+
+struct msg_msgseg {
+        struct msg_msgseg* next;
+        /* the next part of the message follows immediately */
+};
+
+#define DATALEN_MSG     (PAGE_SIZE-sizeof(struct msg_msg))
+#define DATALEN_SEG     (PAGE_SIZE-sizeof(struct msg_msgseg))
+
+struct msg_msg *load_msg(const void __user *src, int len)
+{
+        struct msg_msg *msg;
+        struct msg_msgseg **pseg;
+        int err;
+        int alen;
+
+        alen = len;
+        if (alen > DATALEN_MSG)
+                alen = DATALEN_MSG;
+
+        msg = (struct msg_msg *)kmalloc(sizeof(*msg) + alen, GFP_KERNEL);
+        if (msg == NULL)
+                return ERR_PTR(-ENOMEM);
+
+        msg->next = NULL;
+        msg->security = NULL;
+
+        if (copy_from_user(msg + 1, src, alen)) {
+                err = -EFAULT;
+                goto out_err;
+        }
+
+        len -= alen;
+        src = ((char __user *)src) + alen;
+        pseg = &msg->next;
+        while (len > 0) {
+                struct msg_msgseg *seg;
+                alen = len;
+                if (alen > DATALEN_SEG)
+                        alen = DATALEN_SEG;
+                seg = (struct msg_msgseg *)kmalloc(sizeof(*seg) + alen,
+                                                 GFP_KERNEL);
+                if (seg == NULL) {
+                        err = -ENOMEM;
+                        goto out_err;
+                }
+                *pseg = seg;
+                seg->next = NULL;
+                if (copy_from_user(seg + 1, src, alen)) {
+                        err = -EFAULT;
+                        goto out_err;
+                }
+                pseg = &seg->next;
+                len -= alen;
+                src = ((char __user *)src) + alen;
+        }
+
+        err = security_msg_msg_alloc(msg);
+        if (err)
+                goto out_err;
+
+        return msg;
+
+out_err:
+        free_msg(msg);
+        return ERR_PTR(err);
+}
+
+int store_msg(void __user *dest, struct msg_msg *msg, int len)
+{
+        int alen;
+        struct msg_msgseg *seg;
+
+        alen = len;
+        if (alen > DATALEN_MSG)
+                alen = DATALEN_MSG;
+        if (copy_to_user(dest, msg + 1, alen))
+                return -1;
+
+        len -= alen;
+        dest = ((char __user *)dest) + alen;
+        seg = msg->next;
+        while (len > 0) {
+                alen = len;
+                if (alen > DATALEN_SEG)
+                        alen = DATALEN_SEG;
+                if (copy_to_user(dest, seg + 1, alen))
+                        return -1;
+                len -= alen;
+                dest = ((char __user *)dest) + alen;
+                seg = seg->next;
+        }
+        return 0;
+}
+
+void free_msg(struct msg_msg *msg)
+{
+        struct msg_msgseg *seg;
+
+        security_msg_msg_free(msg);
+
+        seg = msg->next;
+        kfree(msg);
+        while (seg != NULL) {
+                struct msg_msgseg *tmp = seg->next;
+                kfree(seg);
+                seg = tmp;
+        }
+}