The security context for the newly created socket shares the same
user, role and MLS attribute as its creator but may have a different
type, which could be specified by a type_transition rule in the relevant
policy package.
Signed-off-by: Harry Ciao <qingtao.cao@xxxxxxxxxxxxx>
---
security/selinux/hooks.c | 26 ++++++++++++++++++++------
1 files changed, 20 insertions(+), 6 deletions(-)
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index c8d6992..f086541 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -3644,9 +3644,15 @@ static int selinux_skb_peerlbl_sid(struct sk_buff *skb, u16 family, u32 *sid)
/* socket security operations */
-static u32 socket_sockcreate_sid(const struct task_security_struct *tsec)
+static int socket_sockcreate_sid(const struct task_security_struct *tsec,
+ u16 secclass, u32 *socksid)
{
- return tsec->sockcreate_sid ? : tsec->sid;
+ if (tsec->sockcreate_sid > SECSID_NULL) {
+ *socksid = tsec->sockcreate_sid;
+ return 0;
+ }
+
+ return security_transition_sid(tsec->sid, tsec->sid, secclass, socksid);
}
static int sock_has_perm(struct task_struct *task, struct sock *sk, u32 perms)
@@ -3670,12 +3676,16 @@ static int selinux_socket_create(int family, int type,
const struct task_security_struct *tsec = current_security();
u32 newsid;
u16 secclass;
+ int rc;
if (kern)
return 0;
- newsid = socket_sockcreate_sid(tsec);
secclass = socket_type_to_security_class(family, type, protocol);
+ rc = socket_sockcreate_sid(tsec, secclass, &newsid);
+ if (rc)
+ return rc;
+
return avc_has_perm(tsec->sid, newsid, secclass, SOCKET__CREATE, NULL);
}
@@ -3687,12 +3697,16 @@ static int selinux_socket_post_create(struct socket *sock, int family,
struct sk_security_struct *sksec;
int err = 0;
+ isec->sclass = socket_type_to_security_class(family, type, protocol);
+
if (kern)
isec->sid = SECINITSID_KERNEL;
- else
- isec->sid = socket_sockcreate_sid(tsec);
+ else {
+ err = socket_sockcreate_sid(tsec, isec->sclass, &(isec->sid));
+ if (err)
+ return err;
+ }
- isec->sclass = socket_type_to_security_class(family, type, protocol);
isec->initialized = 1;
if (sock->sk) {
--
1.7.0.4
--
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