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Date: Mon, 14 Nov 2016 00:14:20 +0000
From: Ben Hutchings <ben@...adent.org.uk>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC: akpm@...ux-foundation.org, "Al Viro" <viro@...iv.linux.org.uk>
Subject: [PATCH 3.16 276/346] ia64: copy_from_user() should zero the
destination on access_ok() failure
3.16.39-rc1 review patch. If anyone has any objections, please let me know.
------------------
From: Al Viro <viro@...iv.linux.org.uk>
commit a5e541f796f17228793694d64b507f5f57db4cd7 upstream.
Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
[bwh: Backported to 3.16: no calls to check_object_size()]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
--- a/arch/ia64/include/asm/uaccess.h
+++ b/arch/ia64/include/asm/uaccess.h
@@ -262,17 +262,15 @@ __copy_from_user (void *to, const void _
__cu_len; \
})
-#define copy_from_user(to, from, n) \
-({ \
- void *__cu_to = (to); \
- const void __user *__cu_from = (from); \
- long __cu_len = (n); \
- \
- __chk_user_ptr(__cu_from); \
- if (__access_ok(__cu_from, __cu_len, get_fs())) \
- __cu_len = __copy_user((__force void __user *) __cu_to, __cu_from, __cu_len); \
- __cu_len; \
-})
+static inline unsigned long
+copy_from_user(void *to, const void __user *from, unsigned long n)
+{
+ if (likely(__access_ok(from, n, get_fs())))
+ n = __copy_user((__force void __user *) to, from, n);
+ else
+ memset(to, 0, n);
+ return n;
+}
#define __copy_in_user(to, from, size) __copy_user((to), (from), (size))
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