[01/19] SUNRPC: add 'struct cred *' to auth_cred and rpc_cred
diff mbox

Message ID 151296721741.24753.14700939011573169399.stgit@noble
State New
Headers show

Commit Message

NeilBrown Dec. 11, 2017, 4:40 a.m. UTC
The SUNRPC credential framework was put together before
Linux has 'struct cred'.  Now that we have it, it makes sense to
use it.
This first step just includes a suitable 'struct cred *' pointer
in every 'struct auth_cred' and almost every 'struct rpc_cred'.

The rpc_cred used for auth_null has a NULL 'struct cred *' as nothing
else really makes sense.

For rpc_cred, the pointer is reference counted.
For auth_cred it isn't.  struct auth_cred are either allocated on
the stack, in which case the thread owns a reference to the auth,
or are part of 'struct generic_cred' in which case gc_base owns the
reference and acred shares it.

Signed-off-by: NeilBrown <neilb@suse.com>
---
 fs/nfs/flexfilelayout/flexfilelayout.c |   17 +++++++++++++++++
 fs/nfsd/nfs4callback.c                 |   13 ++++++++++++-
 include/linux/sunrpc/auth.h            |    2 ++
 net/sunrpc/auth.c                      |   15 +++++++++++++--
 net/sunrpc/auth_generic.c              |    7 ++++++-
 net/sunrpc/auth_gss/auth_gss.c         |    1 +
 6 files changed, 51 insertions(+), 4 deletions(-)



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Patch
diff mbox

diff --git a/fs/nfs/flexfilelayout/flexfilelayout.c b/fs/nfs/flexfilelayout/flexfilelayout.c
index c75ad982bcfc..b727579a1508 100644
--- a/fs/nfs/flexfilelayout/flexfilelayout.c
+++ b/fs/nfs/flexfilelayout/flexfilelayout.c
@@ -9,6 +9,7 @@ 
 #include <linux/nfs_fs.h>
 #include <linux/nfs_page.h>
 #include <linux/module.h>
+#include <linux/sched/mm.h>
 
 #include <linux/sunrpc/metrics.h>
 
@@ -415,6 +416,7 @@  ff_layout_alloc_lseg(struct pnfs_layout_hdr *lh,
 		struct nfs4_ff_layout_mirror *mirror;
 		struct auth_cred acred = { .group_info = ff_zero_group };
 		struct rpc_cred	__rcu *cred;
+		struct cred *kcred;
 		u32 ds_count, fh_count, id;
 		int j;
 
@@ -491,8 +493,23 @@  ff_layout_alloc_lseg(struct pnfs_layout_hdr *lh,
 
 		acred.gid = make_kgid(&init_user_ns, id);
 
+		if (gfp_flags & __GFP_FS)
+			kcred = prepare_kernel_cred(NULL);
+		else {
+			unsigned int nofs_flags = memalloc_nofs_save();
+			kcred = prepare_kernel_cred(NULL);
+			memalloc_nofs_restore(nofs_flags);
+		}
+		rc = -ENOMEM;
+		if (!kcred)
+			goto out_err_free;
+		kcred->fsuid = acred.uid;
+		kcred->fsgid = acred.gid;
+		acred.cred = kcred;
+
 		/* find the cred for it */
 		rcu_assign_pointer(cred, rpc_lookup_generic_cred(&acred, 0, gfp_flags));
+		put_cred(kcred);
 		if (IS_ERR(cred)) {
 			rc = PTR_ERR(cred);
 			goto out_err_free;
diff --git a/fs/nfsd/nfs4callback.c b/fs/nfsd/nfs4callback.c
index 49b0a9e7ff18..fc5b38ee6c70 100644
--- a/fs/nfsd/nfs4callback.c
+++ b/fs/nfsd/nfs4callback.c
@@ -773,10 +773,21 @@  static struct rpc_cred *get_backchannel_cred(struct nfs4_client *clp, struct rpc
 	} else {
 		struct rpc_auth *auth = client->cl_auth;
 		struct auth_cred acred = {};
+		struct cred *kcred;
+		struct rpc_cred *ret;
+
+		kcred = prepare_kernel_cred(NULL);
+		if (!acred.cred)
+			return NULL;
 
 		acred.uid = ses->se_cb_sec.uid;
 		acred.gid = ses->se_cb_sec.gid;
-		return auth->au_ops->lookup_cred(client->cl_auth, &acred, 0);
+		kcred->uid = acred.uid;
+		kcred->gid = acred.gid;
+		acred.cred = kcred;
+		ret = auth->au_ops->lookup_cred(client->cl_auth, &acred, 0);
+		put_cred(kcred);
+		return ret;
 	}
 }
 
diff --git a/include/linux/sunrpc/auth.h b/include/linux/sunrpc/auth.h
index d9af474a857d..57633e241d4a 100644
--- a/include/linux/sunrpc/auth.h
+++ b/include/linux/sunrpc/auth.h
@@ -46,6 +46,7 @@  enum {
 
 /* Work around the lack of a VFS credential */
 struct auth_cred {
+	const struct cred *cred;
 	kuid_t	uid;
 	kgid_t	gid;
 	struct group_info *group_info;
@@ -68,6 +69,7 @@  struct rpc_cred {
 	unsigned long		cr_expire;	/* when to gc */
 	unsigned long		cr_flags;	/* various flags */
 	atomic_t		cr_count;	/* ref count */
+	const struct cred	*cr_cred;
 
 	kuid_t			cr_uid;
 
diff --git a/net/sunrpc/auth.c b/net/sunrpc/auth.c
index d2623b9f23d6..fd9635dbc17f 100644
--- a/net/sunrpc/auth.c
+++ b/net/sunrpc/auth.c
@@ -634,6 +634,7 @@  rpcauth_lookupcred(struct rpc_auth *auth, int flags)
 	acred.uid = cred->fsuid;
 	acred.gid = cred->fsgid;
 	acred.group_info = cred->group_info;
+	acred.cred = cred;
 	ret = auth->au_ops->lookup_cred(auth, &acred, flags);
 	return ret;
 }
@@ -649,6 +650,7 @@  rpcauth_init_cred(struct rpc_cred *cred, const struct auth_cred *acred,
 	cred->cr_auth = auth;
 	cred->cr_ops = ops;
 	cred->cr_expire = jiffies;
+	cred->cr_cred = get_cred(acred->cred);
 	cred->cr_uid = acred->uid;
 }
 EXPORT_SYMBOL_GPL(rpcauth_init_cred);
@@ -669,11 +671,15 @@  rpcauth_bind_root_cred(struct rpc_task *task, int lookupflags)
 	struct auth_cred acred = {
 		.uid = GLOBAL_ROOT_UID,
 		.gid = GLOBAL_ROOT_GID,
+		.cred = get_task_cred(&init_task),
 	};
+	struct rpc_cred *ret;
 
 	dprintk("RPC: %5u looking up %s cred\n",
 		task->tk_pid, task->tk_client->cl_auth->au_ops->au_name);
-	return auth->au_ops->lookup_cred(auth, &acred, lookupflags);
+	ret = auth->au_ops->lookup_cred(auth, &acred, lookupflags);
+	put_cred(acred.cred);
+	return ret;
 }
 
 static struct rpc_cred *
@@ -715,8 +721,11 @@  put_rpccred(struct rpc_cred *cred)
 		return;
 	/* Fast path for unhashed credentials */
 	if (test_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags) == 0) {
-		if (atomic_dec_and_test(&cred->cr_count))
+		if (atomic_dec_and_test(&cred->cr_count)) {
+			if (cred->cr_cred)
+				put_cred(cred->cr_cred);
 			cred->cr_ops->crdestroy(cred);
+		}
 		return;
 	}
 
@@ -739,6 +748,8 @@  put_rpccred(struct rpc_cred *cred)
 		}
 	}
 	spin_unlock(&rpc_credcache_lock);
+	if (cred->cr_cred)
+		put_cred(cred->cr_cred);
 	cred->cr_ops->crdestroy(cred);
 	return;
 out_nodestroy:
diff --git a/net/sunrpc/auth_generic.c b/net/sunrpc/auth_generic.c
index f1df9837f1ac..08bc5fac1865 100644
--- a/net/sunrpc/auth_generic.c
+++ b/net/sunrpc/auth_generic.c
@@ -61,11 +61,15 @@  struct rpc_cred *rpc_lookup_machine_cred(const char *service_name)
 		.gid = RPC_MACHINE_CRED_GROUPID,
 		.principal = service_name,
 		.machine_cred = 1,
+		.cred = get_task_cred(&init_task),
 	};
+	struct rpc_cred *ret;
 
 	dprintk("RPC:       looking up machine cred for service %s\n",
 			service_name);
-	return generic_auth.au_ops->lookup_cred(&generic_auth, &acred, 0);
+	ret = generic_auth.au_ops->lookup_cred(&generic_auth, &acred, 0);
+	put_cred(acred.cred);
+	return ret;
 }
 EXPORT_SYMBOL_GPL(rpc_lookup_machine_cred);
 
@@ -110,6 +114,7 @@  generic_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags, g
 	gcred->acred.uid = acred->uid;
 	gcred->acred.gid = acred->gid;
 	gcred->acred.group_info = acred->group_info;
+	gcred->acred.cred = gcred->gc_base.cr_cred;
 	gcred->acred.ac_flags = 0;
 	if (gcred->acred.group_info != NULL)
 		get_group_info(gcred->acred.group_info);
diff --git a/net/sunrpc/auth_gss/auth_gss.c b/net/sunrpc/auth_gss/auth_gss.c
index 9463af4b32e8..82301105b4f6 100644
--- a/net/sunrpc/auth_gss/auth_gss.c
+++ b/net/sunrpc/auth_gss/auth_gss.c
@@ -1553,6 +1553,7 @@  static int gss_renew_cred(struct rpc_task *task)
 	struct rpc_auth *auth = oldcred->cr_auth;
 	struct auth_cred acred = {
 		.uid = oldcred->cr_uid,
+		.cred = oldcred->cr_cred,
 		.principal = gss_cred->gc_principal,
 		.machine_cred = (gss_cred->gc_principal != NULL ? 1 : 0),
 	};