[PATCH 5.4 04/84] net/nfc/rawsock.c: fix a permission check bug

Greg Kroah-Hartman
2021-06-14T10:55:58Z

From: Jeimon <jjjinmeng.zhou@gmail.com>

[ Upstream commit 8ab78863e9eff11910e1ac8bcf478060c29b379e ]

The function rawsock_create() calls a privileged function sk_alloc(), which requires a ns-aware check to check net->user_ns, i.e., ns_capable(). However, the original code checks the init_user_ns using capable(). So we replace the capable() with ns_capable().

Signed-off-by: Jeimon <jjjinmeng.zhou@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
net/nfc/rawsock.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/nfc/rawsock.c b/net/nfc/rawsock.c
index 23d5e56306a4..8d649f4aee79 100644
--- a/net/nfc/rawsock.c
+++ b/net/nfc/rawsock.c
@@ -333,7 +333,7 @@ static int rawsock_create(struct net *net, struct socket *sock,
return -ESOCKTNOSUPPORT;

if (sock->type == SOCK_RAW) {
- if (!capable(CAP_NET_RAW))
+ if (!ns_capable(net->user_ns, CAP_NET_RAW))
return -EPERM;
sock->ops = &rawsock_raw_ops;
} else {
--
2.30.2