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From: NeilBrown <neilb@suse.com>
To: "J. Bruce Fields" <bfields@fieldses.org>,
	Chuck Lever <chuck.lever@oracle.com>,
	Jeff Layton <jlayton@kernel.org>,
	Trond Myklebust <trond.myklebust@hammerspace.com>,
	Anna Schumaker <anna.schumaker@netapp.com>
Cc: Linux NFS Mailing List <linux-nfs@vger.kernel.org>,
	linux-kernel@vger.kernel.org
Subject: [PATCH 05/23] SUNRPC: add 'struct cred *' to auth_cred and rpc_cred
Date: Wed, 07 Nov 2018 15:12:30 +1100	[thread overview]
Message-ID: <154156395089.24086.6277617015828499248.stgit@noble> (raw)
In-Reply-To: <154156285766.24086.14262073575778354276.stgit@noble>

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                      |    8 +++++++-
 net/sunrpc/auth_generic.c              |    8 +++++++-
 net/sunrpc/auth_gss/auth_gss.c         |    2 ++
 net/sunrpc/auth_unix.c                 |    1 +
 7 files changed, 48 insertions(+), 3 deletions(-)

diff --git a/fs/nfs/flexfilelayout/flexfilelayout.c b/fs/nfs/flexfilelayout/flexfilelayout.c
index 86bcba40ca61..9df686561f95 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 25987bcdf96f..7c7e3510599d 100644
--- a/fs/nfsd/nfs4callback.c
+++ b/fs/nfsd/nfs4callback.c
@@ -858,10 +858,21 @@ 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 (!kcred)
+			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 c4db9424b63b..1f95bd612053 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 */
 	refcount_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 ad8ead738981..a7e08e44f92b 100644
--- a/net/sunrpc/auth.c
+++ b/net/sunrpc/auth.c
@@ -659,6 +659,7 @@ 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;
 }
@@ -674,6 +675,7 @@ 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);
@@ -694,11 +696,15 @@ 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 *
diff --git a/net/sunrpc/auth_generic.c b/net/sunrpc/auth_generic.c
index d8831b988b1e..ec28f7edb615 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);
@@ -132,6 +137,7 @@ generic_free_cred(struct rpc_cred *cred)
 	dprintk("RPC:       generic_free_cred %p\n", gcred);
 	if (gcred->acred.group_info != NULL)
 		put_group_info(gcred->acred.group_info);
+	put_cred(cred->cr_cred);
 	kfree(gcred);
 }
 
diff --git a/net/sunrpc/auth_gss/auth_gss.c b/net/sunrpc/auth_gss/auth_gss.c
index 30f970cdc7f6..092452b9f05c 100644
--- a/net/sunrpc/auth_gss/auth_gss.c
+++ b/net/sunrpc/auth_gss/auth_gss.c
@@ -1320,6 +1320,7 @@ gss_destroy_nullcred(struct rpc_cred *cred)
 	struct gss_cl_ctx *ctx = rcu_dereference_protected(gss_cred->gc_ctx, 1);
 
 	RCU_INIT_POINTER(gss_cred->gc_ctx, NULL);
+	put_cred(cred->cr_cred);
 	call_rcu(&cred->cr_rcu, gss_free_cred_callback);
 	if (ctx)
 		gss_put_ctx(ctx);
@@ -1585,6 +1586,7 @@ 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),
 	};
diff --git a/net/sunrpc/auth_unix.c b/net/sunrpc/auth_unix.c
index 4c1c7e56288f..36e01384f082 100644
--- a/net/sunrpc/auth_unix.c
+++ b/net/sunrpc/auth_unix.c
@@ -97,6 +97,7 @@ static void
 unx_free_cred(struct unx_cred *unx_cred)
 {
 	dprintk("RPC:       unx_free_cred %p\n", unx_cred);
+	put_cred(unx_cred->uc_base.cr_cred);
 	kfree(unx_cred);
 }
 



  parent reply	other threads:[~2018-11-07  4:14 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-11-07  4:12 [PATCH 00/23 - V4] NFS: Remove generic RPC credentials NeilBrown
2018-11-07  4:12 ` [PATCH 06/23] SUNRPC: remove groupinfo from struct auth_cred NeilBrown
2018-11-07  4:12 ` [PATCH 03/23] cred: export get_task_cred() NeilBrown
2018-11-07  4:12 ` [PATCH 04/23] cred: allow get_cred() and put_cred() to be given NULL NeilBrown
2018-11-07  4:12 ` NeilBrown [this message]
2018-11-07  4:12 ` [PATCH 01/23] cred: add cred_fscmp() for comparing creds NeilBrown
2018-11-07  4:12 ` [PATCH 02/23] cred: add get_cred_rcu() NeilBrown
2018-11-07  4:12 ` [PATCH 21/23] SUNRPC: remove crbind rpc_cred operation NeilBrown
2018-11-07  4:12 ` [PATCH 11/23] SUNRPC: discard RPC_DO_ROOTOVERRIDE() NeilBrown
2018-11-07  4:12 ` [PATCH 22/23] SUNRPC: simplify auth_unix NeilBrown
2018-11-07 15:19   ` Chuck Lever
2018-11-08  1:41     ` NeilBrown
2018-11-08 15:54       ` Chuck Lever
2018-11-09  0:45         ` NeilBrown
2018-11-07  4:12 ` [PATCH 18/23] NFS: struct nfs_open_dir_context: convert rpc_cred pointer to cred NeilBrown
2018-11-07  4:12 ` [PATCH 20/23] SUNRPC: remove generic cred code NeilBrown
2018-11-07  4:12 ` [PATCH 23/23] SUNRPC discard cr_uid from struct rpc_cred NeilBrown
2018-11-07  4:12 ` [PATCH 10/23] NFSv4: don't require lock for get_renew_cred or get_machine_cred NeilBrown
2018-11-07  4:12 ` [PATCH 19/23] NFS/NFSD/SUNRPC: replace generic creds with 'struct cred' NeilBrown
2018-11-07  4:12 ` [PATCH 12/23] NFS/SUNRPC: don't lookup machine credential until rpcauth_bindcred() NeilBrown
2018-11-07  4:12 ` [PATCH 17/23] NFS: change access cache to use 'struct cred' NeilBrown
2018-11-07  4:12 ` [PATCH 07/23] SUNRPC: remove uid and gid from struct auth_cred NeilBrown
2018-11-07  4:12 ` [PATCH 16/23] SUNRPC: remove RPCAUTH_AUTH_NO_CRKEY_TIMEOUT NeilBrown
2018-11-07  4:12 ` [PATCH 09/23] NFSv4: add cl_root_cred for use when machine cred is not available NeilBrown
2018-11-07  4:12 ` [PATCH 14/23] SUNRPC: add side channel to use non-generic cred for rpc call NeilBrown
2018-11-07  4:12 ` [PATCH 13/23] SUNRPC: introduce RPC_TASK_NULLCREDS to request auth_none NeilBrown
2018-11-07  4:12 ` [PATCH 08/23] SUNRPC: remove machine_cred field from struct auth_cred NeilBrown
2018-11-07  4:12 ` [PATCH 15/23] NFS: move credential expiry tracking out of SUNRPC into NFS NeilBrown
2018-11-29 23:19 ` [PATCH 00/23 - V4] NFS: Remove generic RPC credentials NeilBrown
2018-11-30 19:39   ` Schumaker, Anna
2018-12-03  0:30 [PATCH 00/23 - V5] " NeilBrown
2018-12-03  0:30 ` [PATCH 05/23] SUNRPC: add 'struct cred *' to auth_cred and rpc_cred NeilBrown

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