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In ncp_conn_alloc(), a new credential pointer, 'owner', is set up to point

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at the credential to be used by the connection.  However, the pointer's
value was ignored when actually setting hcp->nc_owner.

(1) Do set nc_owner to the owner pointer value so that the credential is
    not discarded after being carefully configured.

(2) In the case where we create a new credential with modified uid, copy
    the existing credential to initialize non-uid fields to existing
    values, which will lead to a fully initialized MAC label, groups, etc.

Found with:	Coverity Prevent(tm)
CID:		2226
This commit is contained in:
Robert Watson 2007-05-27 17:14:33 +00:00
parent b312d4b0ba
commit bdcfa9589b
1 changed files with 4 additions and 3 deletions
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7
sys/netncp/ncp_conn.c
View file

@ -223,10 +223,10 @@ ncp_conn_alloc(struct ncp_conn_args *cap, struct thread *td, struct ucred *cred,
if (cap->saddr.sa_family != AF_INET && cap->saddr.sa_family != AF_IPX)
return EPROTONOSUPPORT;
isroot = ncp_suser(cred) == 0;
/*
* Only root can change ownership
* Only root can change ownership.
*/
isroot = ncp_suser(cred) == 0;
if (cap->owner != NCP_DEFAULT_OWNER && !isroot)
return EPERM;
if (cap->group != NCP_DEFAULT_GROUP &&
@ -234,6 +234,7 @@ ncp_conn_alloc(struct ncp_conn_args *cap, struct thread *td, struct ucred *cred,
return EPERM;
if (cap->owner != NCP_DEFAULT_OWNER) {
owner = crget();
crcopy(owner, cred);
owner->cr_uid = cap->owner;
} else
owner = crhold(cred);
@ -243,7 +244,7 @@ ncp_conn_alloc(struct ncp_conn_args *cap, struct thread *td, struct ucred *cred,
lockinit(&ncp->nc_lock, PZERO, "ncplck", 0, 0);
ncp_conn_cnt++;
ncp->nc_id = ncp_next_ref++;
ncp->nc_owner = cred;
ncp->nc_owner = owner;
ncp->seq = 0;
ncp->connid = 0xFFFF;
ncp->li = *cap;