[5/5] nfc: enforce CAP_NET_RAW for raw sockets
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Message ID 20191003181318.19616-6-tyhicks@canonical.com
State New
Headers show
Series
  • CVE-2019-1705{2, 3, 4, 5, 6}: Missing CAP_NET_RAW checks
Related show

Commit Message

Tyler Hicks Oct. 3, 2019, 6:13 p.m. UTC
From: Ori Nimron <orinimron123@gmail.com>

When creating a raw AF_NFC socket, CAP_NET_RAW needs to be checked
first.

Signed-off-by: Ori Nimron <orinimron123@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

CVE-2019-17056

(cherry picked from commit 3a359798b176183ef09efb7a3dc59abad1cc7104)
Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
---
 net/nfc/llcp_sock.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

Patch
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diff --git a/net/nfc/llcp_sock.c b/net/nfc/llcp_sock.c
index 9b8742947aff..8dfea26536c9 100644
--- a/net/nfc/llcp_sock.c
+++ b/net/nfc/llcp_sock.c
@@ -1004,10 +1004,13 @@  static int llcp_sock_create(struct net *net, struct socket *sock,
 	    sock->type != SOCK_RAW)
 		return -ESOCKTNOSUPPORT;
 
-	if (sock->type == SOCK_RAW)
+	if (sock->type == SOCK_RAW) {
+		if (!capable(CAP_NET_RAW))
+			return -EPERM;
 		sock->ops = &llcp_rawsock_ops;
-	else
+	} else {
 		sock->ops = &llcp_sock_ops;
+	}
 
 	sk = nfc_llcp_sock_alloc(sock, sock->type, GFP_ATOMIC, kern);
 	if (sk == NULL)