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security: remove the security_netlink_recv hook as it is equivalent to capable()

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Once upon a time netlink was not sync and we had to get the effective
capabilities from the skb that was being received.  Today we instead get
the capabilities from the current task.  This has rendered the entire
purpose of the hook moot as it is now functionally equivalent to the
capable() call.

Signed-off-by: Eric Paris <[email protected]>
This commit is contained in:
Eric Paris 2012-01-03 12:25:16 -05:00
commit fd77846152
14 changed files with 10 additions and 58 deletions
Download patch file Download diff file Expand all files Collapse all files

1
security/capability.c
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@ -999,7 +999,6 @@ void __init security_fixup_ops(struct security_operations *ops)
set_to_cap_if_null(ops, sem_semctl);
set_to_cap_if_null(ops, sem_semop);
set_to_cap_if_null(ops, netlink_send);
set_to_cap_if_null(ops, netlink_recv);
set_to_cap_if_null(ops, d_instantiate);
set_to_cap_if_null(ops, getprocattr);
set_to_cap_if_null(ops, setprocattr);

8
security/commoncap.c
View file

@ -56,14 +56,6 @@ int cap_netlink_send(struct sock *sk, struct sk_buff *skb)
return 0;
}
int cap_netlink_recv(struct sk_buff *skb, int cap)
{
if (!cap_raised(current_cap(), cap))
return -EPERM;
return 0;
}
EXPORT_SYMBOL(cap_netlink_recv);
/**
* cap_capable - Determine whether a task has a particular effective capability
* @cred: The credentials to use

6
security/security.c
View file

@ -922,12 +922,6 @@ int security_netlink_send(struct sock *sk, struct sk_buff *skb)
return security_ops->netlink_send(sk, skb);
}
int security_netlink_recv(struct sk_buff *skb, int cap)
{
return security_ops->netlink_recv(skb, cap);
}
EXPORT_SYMBOL(security_netlink_recv);
int security_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
{
return security_ops->secid_to_secctx(secid, secdata, seclen);

19
security/selinux/hooks.c
View file

@ -4713,24 +4713,6 @@ static int selinux_netlink_send(struct sock *sk, struct sk_buff *skb)
return selinux_nlmsg_perm(sk, skb);
}
static int selinux_netlink_recv(struct sk_buff *skb, int capability)
{
int err;
struct common_audit_data ad;
u32 sid;
err = cap_netlink_recv(skb, capability);
if (err)
return err;
COMMON_AUDIT_DATA_INIT(&ad, CAP);
ad.u.cap = capability;
security_task_getsecid(current, &sid);
return avc_has_perm(sid, sid, SECCLASS_CAPABILITY,
CAP_TO_MASK(capability), &ad);
}
static int ipc_alloc_security(struct task_struct *task,
struct kern_ipc_perm *perm,
u16 sclass)
@ -5459,7 +5441,6 @@ static struct security_operations selinux_ops = {
.vm_enough_memory = selinux_vm_enough_memory,
.netlink_send = selinux_netlink_send,
.netlink_recv = selinux_netlink_recv,
.bprm_set_creds = selinux_bprm_set_creds,
.bprm_committing_creds = selinux_bprm_committing_creds,