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[AF_UNIX]: Kernel memory leak fix for af_unix datagram getpeersec patch

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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>
This commit is contained in:
Catherine Zhang 2006-08-02 14:12:06 -07:00 • committed by David S. Miller
parent 2b7e24b66d
commit dc49c1f94e
7 changed files with 110 additions and 44 deletions
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6
include/net/af_unix.h
View file

@ -54,15 +54,13 @@ struct unix_skb_parms {
struct ucred creds; /* Skb credentials */
struct scm_fp_list *fp; /* Passed files */
#ifdef CONFIG_SECURITY_NETWORK
char *secdata; /* Security context */
u32 seclen; /* Security length */
u32 secid; /* Security ID */
#endif
};
#define UNIXCB(skb) (*(struct unix_skb_parms*)&((skb)->cb))
#define UNIXCREDS(skb) (&UNIXCB((skb)).creds)
#define UNIXSECDATA(skb) (&UNIXCB((skb)).secdata)
#define UNIXSECLEN(skb) (&UNIXCB((skb)).seclen)
#define UNIXSID(skb) (&UNIXCB((skb)).secid)
#define unix_state_rlock(s) spin_lock(&unix_sk(s)->lock)
#define unix_state_runlock(s) spin_unlock(&unix_sk(s)->lock)