[PATCH] mmaper_kern.c fixes [buffer overruns]

 - copy_from_user() can fail; ->write() must check its return value.

 - severe buffer overruns both in ->read() and ->write() - lseek to the
   end (i.e.  to mmapper_size) and

	if (count + *ppos > mmapper_size)
		count = count + *ppos - mmapper_size;

   will do absolutely nothing.  Then it will call

	copy_to_user(buf,&v_buf[*ppos],count);

   with obvious results (similar for ->write()).

   Fixed by turning read to simple_read_from_buffer() and by doing
   normal limiting of count in ->write().

 - gratitious lock_kernel() in ->mmap() - it's useless there.

 - lots of gratuitous includes.

Signed-off-by: Al Viro <viro@parcelfarce.linux.theplanet.co.uk>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 9 insertions, 32 deletions

diff --git a/arch/um/drivers/mmapper_kern.c b/arch/um/drivers/mmapper_kern.c
index a37a5ac13c22..022f67bb6873 100644
--- a/arch/um/drivers/mmapper_kern.c
+++ b/arch/um/drivers/mmapper_kern.c
@@ -9,19 +9,11 @@
  *
  */
 
-#include <linux/types.h>
-#include <linux/kdev_t.h>
-#include <linux/time.h>
-#include <linux/devfs_fs_kernel.h>
+#include <linux/init.h> 
 #include <linux/module.h>
 #include <linux/mm.h> 
-#include <linux/slab.h>
-#include <linux/init.h> 
-#include <linux/smp_lock.h>
 #include <linux/miscdevice.h>
 #include <asm/uaccess.h>
-#include <asm/irq.h>
-#include <asm/pgtable.h>
 #include "mem_user.h"
 #include "user_util.h"
  
@@ -31,35 +23,22 @@ static unsigned long p_buf = 0;
 static char *v_buf = NULL;
 
 static ssize_t
-mmapper_read(struct file *file, char *buf, size_t count, loff_t *ppos)
+mmapper_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 {
-        if(*ppos > mmapper_size)
-                return -EINVAL;
-
-        if(count + *ppos > mmapper_size)
-                count = count + *ppos - mmapper_size;
-
-        if(count < 0)
-                return -EINVAL;
- 
-        copy_to_user(buf,&v_buf[*ppos],count);
-        
-        return count;
+        return simple_read_from_buffer(buf, count, ppos, v_buf, mmapper_size);
 }
 
 static ssize_t
-mmapper_write(struct file *file, const char *buf, size_t count, loff_t *ppos)
+mmapper_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 {
-        if(*ppos > mmapper_size)
+        if (*ppos > mmapper_size)
                 return -EINVAL;
 
-        if(count + *ppos > mmapper_size)
-                count = count + *ppos - mmapper_size;
-
-        if(count < 0)
-                return -EINVAL;
+        if (count > mmapper_size - *ppos)
+                count = mmapper_size - *ppos;
 
-        copy_from_user(&v_buf[*ppos],buf,count);
+        if (copy_from_user(&v_buf[*ppos], buf, count))
+                return -EFAULT;
         
         return count;
 }
@@ -77,7 +56,6 @@ mmapper_mmap(struct file *file, struct vm_area_struct * vma)
         int ret = -EINVAL;
         int size;
 
-        lock_kernel();
         if (vma->vm_pgoff != 0)
                 goto out;
         
@@ -92,7 +70,6 @@ mmapper_mmap(struct file *file, struct vm_area_struct * vma)
                 goto out;
         ret = 0;
 out:
-        unlock_kernel();
         return ret;
 }