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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 /net/ipv4
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 'net/ipv4')
-rw-r--r--net/ipv4/ip_sockglue.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index 84f43a3c909..2d05c4133d3 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -112,14 +112,19 @@ static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb)
static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
{
char *secdata;
- u32 seclen;
+ u32 seclen, secid;
int err;
- err = security_socket_getpeersec_dgram(skb, &secdata, &seclen);
+ err = security_socket_getpeersec_dgram(NULL, skb, &secid);
+ if (err)
+ return;
+
+ err = security_secid_to_secctx(secid, &secdata, &seclen);
if (err)
return;
put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
+ security_release_secctx(secdata, seclen);
}