path: root/security/security.c
diff options
authorDavid Herrmann <dh.herrmann@gmail.com>2018-05-04 16:28:19 +0200
committerJames Morris <james.morris@microsoft.com>2018-05-04 12:48:54 -0700
commitaae7cfcbb733cf16f3bc9cbb650673b94d5df75f (patch)
tree5e90734622f6f65d6eb7ed83099c05ad8cc2c80c /security/security.c
parentMerge tag 'v4.17-rc3' into next-general (diff)
security: add hook for socketpair()
Right now the LSM labels for socketpairs are always uninitialized, since there is no security hook for the socketpair() syscall. This patch adds the required hooks so LSMs can properly label socketpairs. This allows SO_PEERSEC to return useful information on those sockets. Note that the behavior of socketpair() can be emulated by creating a listener socket, connecting to it, and then discarding the initial listener socket. With this workaround, SO_PEERSEC would return the caller's security context. However, with socketpair(), the uninitialized context is returned unconditionally. This is unexpected and makes socketpair() less useful in situations where the security context is crucial to the application. With the new socketpair-hook this disparity can be solved by making socketpair() return the expected security context. Acked-by: Serge Hallyn <serge@hallyn.com> Signed-off-by: Tom Gundersen <teg@jklm.no> Signed-off-by: David Herrmann <dh.herrmann@gmail.com> Signed-off-by: James Morris <james.morris@microsoft.com>
Diffstat (limited to 'security/security.c')
1 files changed, 6 insertions, 0 deletions
diff --git a/security/security.c b/security/security.c
index 7bc2fde023a7..68f46d849abe 100644
--- a/security/security.c
+++ b/security/security.c
@@ -1358,6 +1358,12 @@ int security_socket_post_create(struct socket *sock, int family,
protocol, kern);
+int security_socket_socketpair(struct socket *socka, struct socket *sockb)
+ return call_int_hook(socket_socketpair, 0, socka, sockb);
int security_socket_bind(struct socket *sock, struct sockaddr *address, int addrlen)
return call_int_hook(socket_bind, 0, sock, address, addrlen);