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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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41
include/linux/security.h
View file

@ -1109,6 +1109,16 @@ struct swap_info_struct;
* @name contains the name of the security module being unstacked.
* @ops contains a pointer to the struct security_operations of the module to unstack.
*
* @secid_to_secctx:
* Convert secid to security context.
* @secid contains the security ID.
* @secdata contains the pointer that stores the converted security context.
*
* @release_secctx:
* Release the security context.
* @secdata contains the security context.
* @seclen contains the length of the security context.
*
* This is the main security structure.
*/
struct security_operations {
@ -1289,6 +1299,8 @@ struct security_operations {
int (*getprocattr)(struct task_struct *p, char *name, void *value, size_t size);
int (*setprocattr)(struct task_struct *p, char *name, void *value, size_t size);
int (*secid_to_secctx)(u32 secid, char **secdata, u32 *seclen);
void (*release_secctx)(char *secdata, u32 seclen);
#ifdef CONFIG_SECURITY_NETWORK
int (*unix_stream_connect) (struct socket * sock,
@ -1317,7 +1329,7 @@ struct security_operations {
int (*socket_shutdown) (struct socket * sock, int how);
int (*socket_sock_rcv_skb) (struct sock * sk, struct sk_buff * skb);
int (*socket_getpeersec_stream) (struct socket *sock, char __user *optval, int __user *optlen, unsigned len);
int (*socket_getpeersec_dgram) (struct sk_buff *skb, char **secdata, u32 *seclen);
int (*socket_getpeersec_dgram) (struct socket *sock, struct sk_buff *skb, u32 *secid);
int (*sk_alloc_security) (struct sock *sk, int family, gfp_t priority);
void (*sk_free_security) (struct sock *sk);
unsigned int (*sk_getsid) (struct sock *sk, struct flowi *fl, u8 dir);
@ -2059,6 +2071,16 @@ static inline int security_netlink_recv(struct sk_buff * skb, int cap)
return security_ops->netlink_recv(skb, cap);
}
static inline int security_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
{
return security_ops->secid_to_secctx(secid, secdata, seclen);
}
static inline void security_release_secctx(char *secdata, u32 seclen)
{
return security_ops->release_secctx(secdata, seclen);
}
/* prototypes */
extern int security_init (void);
extern int register_security (struct security_operations *ops);
@ -2725,6 +2747,15 @@ static inline void securityfs_remove(struct dentry *dentry)
{
}
static inline int security_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
{
return -EOPNOTSUPP;
}
static inline void security_release_secctx(char *secdata, u32 seclen)
{
return -EOPNOTSUPP;
}
#endif /* CONFIG_SECURITY */
#ifdef CONFIG_SECURITY_NETWORK
@ -2840,10 +2871,9 @@ static inline int security_socket_getpeersec_stream(struct socket *sock, char __
return security_ops->socket_getpeersec_stream(sock, optval, optlen, len);
}
static inline int security_socket_getpeersec_dgram(struct sk_buff *skb, char **secdata,
u32 *seclen)
static inline int security_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb, u32 *secid)
{
return security_ops->socket_getpeersec_dgram(skb, secdata, seclen);
return security_ops->socket_getpeersec_dgram(sock, skb, secid);
}
static inline int security_sk_alloc(struct sock *sk, int family, gfp_t priority)
@ -2968,8 +2998,7 @@ static inline int security_socket_getpeersec_stream(struct socket *sock, char __
return -ENOPROTOOPT;
}
static inline int security_socket_getpeersec_dgram(struct sk_buff *skb, char **secdata,
u32 *seclen)
static inline int security_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb, u32 *secid)
{
return -ENOPROTOOPT;
}