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authorCatherine Zhang <cxzhang@watson.ibm.com>2006-08-02 14:12:06 -0700
committerDavid S. Miller <davem@davemloft.net>2006-08-02 14:12:06 -0700
commitdc49c1f94e3469d94b952e8f5160dd4ccd791d79 (patch)
treee47b1974c262a03dbabf0a148325d9089817e78e /security/dummy.c
parent2b7e24b66d31d677d76b49918e711eb360c978b6 (diff)
[AF_UNIX]: Kernel memory leak fix for af_unix datagram getpeersec patch
From: Catherine Zhang <cxzhang@watson.ibm.com> This patch implements a cleaner fix for the memory leak problem of the original unix datagram getpeersec patch. Instead of creating a security context each time a unix datagram is sent, we only create the security context when the receiver requests it. This new design requires modification of the current unix_getsecpeer_dgram LSM hook and addition of two new hooks, namely, secid_to_secctx and release_secctx. The former retrieves the security context and the latter releases it. A hook is required for releasing the security context because it is up to the security module to decide how that's done. In the case of Selinux, it's a simple kfree operation. Acked-by: Stephen Smalley <sds@tycho.nsa.gov> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'security/dummy.c')
-rw-r--r--security/dummy.c14
1 files changed, 12 insertions, 2 deletions
diff --git a/security/dummy.c b/security/dummy.c
index bbbfda70e131..58c6d399c844 100644
--- a/security/dummy.c
+++ b/security/dummy.c
@@ -791,8 +791,7 @@ static int dummy_socket_getpeersec_stream(struct socket *sock, char __user *optv
return -ENOPROTOOPT;
}
-static int dummy_socket_getpeersec_dgram(struct sk_buff *skb, char **secdata,
- u32 *seclen)
+static int dummy_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb, u32 *secid)
{
return -ENOPROTOOPT;
}
@@ -876,6 +875,15 @@ static int dummy_setprocattr(struct task_struct *p, char *name, void *value, siz
return -EINVAL;
}
+static int dummy_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
+{
+ return -EOPNOTSUPP;
+}
+
+static void dummy_release_secctx(char *secdata, u32 seclen)
+{
+}
+
#ifdef CONFIG_KEYS
static inline int dummy_key_alloc(struct key *key, struct task_struct *ctx,
unsigned long flags)
@@ -1028,6 +1036,8 @@ void security_fixup_ops (struct security_operations *ops)
set_to_dummy_if_null(ops, d_instantiate);
set_to_dummy_if_null(ops, getprocattr);
set_to_dummy_if_null(ops, setprocattr);
+ set_to_dummy_if_null(ops, secid_to_secctx);
+ set_to_dummy_if_null(ops, release_secctx);
#ifdef CONFIG_SECURITY_NETWORK
set_to_dummy_if_null(ops, unix_stream_connect);
set_to_dummy_if_null(ops, unix_may_send);