s390/uaccess: remove copy_from_user_real()
There is no user left, so remove it.
It was also potentially broken, since the function didn't clear destination
memory if copy_from_user() failed. Which would allow for information leaks.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/arch/s390/include/asm/uaccess.h b/arch/s390/include/asm/uaccess.h
index 2710b41..4133b3f 100644
--- a/arch/s390/include/asm/uaccess.h
+++ b/arch/s390/include/asm/uaccess.h
@@ -344,6 +344,5 @@
}
int copy_to_user_real(void __user *dest, void *src, unsigned long count);
-int copy_from_user_real(void *dest, void __user *src, unsigned long count);
#endif /* __S390_UACCESS_H */
diff --git a/arch/s390/mm/maccess.c b/arch/s390/mm/maccess.c
index efe8ad0..2a2e354 100644
--- a/arch/s390/mm/maccess.c
+++ b/arch/s390/mm/maccess.c
@@ -152,32 +152,6 @@
}
/*
- * Copy memory from user (virtual) to kernel (real)
- */
-int copy_from_user_real(void *dest, void __user *src, unsigned long count)
-{
- int offs = 0, size, rc;
- char *buf;
-
- buf = (char *) __get_free_page(GFP_KERNEL);
- if (!buf)
- return -ENOMEM;
- rc = -EFAULT;
- while (offs < count) {
- size = min(PAGE_SIZE, count - offs);
- if (copy_from_user(buf, src + offs, size))
- goto out;
- if (memcpy_real(dest + offs, buf, size))
- goto out;
- offs += size;
- }
- rc = 0;
-out:
- free_page((unsigned long) buf);
- return rc;
-}
-
-/*
* Check if physical address is within prefix or zero page
*/
static int is_swapped(unsigned long addr)
