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| author | Catherine Zhang <cxzhang@watson.ibm.com> | 2006-08-02 14:12:06 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2006-08-02 14:12:06 -0700 |
| commit | dc49c1f94e3469d94b952e8f5160dd4ccd791d79 (patch) | |
| tree | e47b1974c262a03dbabf0a148325d9089817e78e /security/dummy.c | |
| parent | 2b7e24b66d31d677d76b49918e711eb360c978b6 (diff) | |
| download | linux-3.10-dc49c1f94e3469d94b952e8f5160dd4ccd791d79.tar.gz linux-3.10-dc49c1f94e3469d94b952e8f5160dd4ccd791d79.tar.bz2 linux-3.10-dc49c1f94e3469d94b952e8f5160dd4ccd791d79.zip | |
[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.c | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/security/dummy.c b/security/dummy.c index bbbfda70e13..58c6d399c84 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); |