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SUNRPC: Cache the process user cred in the RPC server listener

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In order to be able to interpret uids and gids correctly in knfsd, we
should cache the user namespace of the process that created the RPC
server's listener. To do so, we refcount the credential of that process.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Trond Myklebust
2019-04-09 12:13:37 -04:00
committed by J. Bruce Fields
parent e333f3bbef
commit 4df493a260
9 changed files with 39 additions and 26 deletions
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4
net/sunrpc/svcsock.c
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@@ -1332,13 +1332,14 @@ EXPORT_SYMBOL_GPL(svc_alien_sock);
* @fd: file descriptor of the new listener
* @name_return: pointer to buffer to fill in with name of listener
* @len: size of the buffer
* @cred: credential
*
* Fills in socket name and returns positive length of name if successful.
* Name is terminated with '\n'. On error, returns a negative errno
* value.
*/
int svc_addsock(struct svc_serv *serv, const int fd, char *name_return,
const size_t len)
const size_t len, const struct cred *cred)
{
int err = 0;
struct socket *so = sockfd_lookup(fd, &err);
@@ -1371,6 +1372,7 @@ int svc_addsock(struct svc_serv *serv, const int fd, char *name_return,
salen = kernel_getsockname(svsk->sk_sock, sin);
if (salen >= 0)
svc_xprt_set_local(&svsk->sk_xprt, sin, salen);
svsk->sk_xprt.xpt_cred = get_cred(cred);
svc_add_new_perm_xprt(serv, &svsk->sk_xprt);
return svc_one_sock_name(svsk, name_return, len);
out: