lkml.org 
[lkml]   [2022]   [Dec]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 3/4] mm/mempolicy: return EINVAL for illegal user memory range for mbind
Date
From: Ma Wupeng <mawupeng1@huawei.com>

Add access_ok to check user memory range and return EINVAL if overflows for
mbind.

Signed-off-by: Ma Wupeng <mawupeng1@huawei.com>
---
mm/mempolicy.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index e3a2c465fe8a..a6bddf454953 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -1272,6 +1272,9 @@ static long do_mbind(unsigned long start, unsigned long len,
if (start & ~PAGE_MASK)
return -EINVAL;

+ if (unlikely(!access_ok((void __user *)start, len)))
+ return -EINVAL;
+
if (mode == MPOL_DEFAULT)
flags &= ~MPOL_MF_STRICT;

--
2.25.1
\
 
 \ /
  Last update: 2022-12-05 04:42    [W:0.208 / U:1.528 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site