leandrof/linux
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

net: xfrm: fix shift-out-of-bounce

Browse Source 
We need to check up->dirmask to avoid shift-out-of-bounce bug,
since up->dirmask comes from userspace.

Also, added XFRM_USERPOLICY_DIRMASK_MAX constant to uapi to inform
user-space that up->dirmask has maximum possible value

Fixes: 2d151d3907 ("xfrm: Add possibility to set the default to block if we have no policy")
Reported-and-tested-by: syzbot+9cd5837a045bbee5b810@syzkaller.appspotmail.com
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Pavel Skripkin
2021-07-28 19:38:18 +03:00
committed by Steffen Klassert
parent 2d151d3907
commit 5d8dbb7fb8
2 changed files with 7 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
include/uapi/linux/xfrm.h
View File

@@ -514,6 +514,7 @@ struct xfrm_user_offload {
#define XFRM_OFFLOAD_INBOUND 2
struct xfrm_userpolicy_default {
#define XFRM_USERPOLICY_DIRMASK_MAX (sizeof(__u8) * 8)
__u8 dirmask;
__u8 action;
};