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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/net/sunrpc/svcauth_unix.c
..
..
@@ -1,3 +1,4 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
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 #include <linux/types.h>
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3
 #include <linux/sched.h>
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 #include <linux/module.h>
..
..
@@ -37,12 +38,18 @@
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 extern struct auth_ops svcauth_null;
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 extern struct auth_ops svcauth_unix;
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40
 
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-static void svcauth_unix_domain_release(struct auth_domain *dom)
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+static void svcauth_unix_domain_release_rcu(struct rcu_head *head)
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 {
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+	struct auth_domain *dom = container_of(head, struct auth_domain, rcu_head);
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 	struct unix_domain *ud = container_of(dom, struct unix_domain, h);
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45
 
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 	kfree(dom->name);
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 	kfree(ud);
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+}
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+
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+static void svcauth_unix_domain_release(struct auth_domain *dom)
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+{
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+	call_rcu(&dom->rcu_head, svcauth_unix_domain_release_rcu);
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 }
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54
 
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 struct auth_domain *unix_domain_find(char *name)
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@@ -50,7 +57,7 @@
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 	struct auth_domain *rv;
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 	struct unix_domain *new = NULL;
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-	rv = auth_domain_lookup(name, NULL);
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+	rv = auth_domain_find(name);
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 	while(1) {
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 		if (rv) {
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 			if (new && rv != &new->h)
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@@ -91,6 +98,7 @@
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 	char			m_class[8]; /* e.g. "nfsd" */
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 	struct in6_addr		m_addr;
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 	struct unix_domain	*m_client;
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+	struct rcu_head		m_rcu;
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 };
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103
 
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 static void ip_map_put(struct kref *kref)
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@@ -101,7 +109,7 @@
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 	if (test_bit(CACHE_VALID, &item->flags) &&
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 	    !test_bit(CACHE_NEGATIVE, &item->flags))
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 		auth_domain_put(&im->m_client->h);
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-	kfree(im);
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+	kfree_rcu(im, m_rcu);
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 }
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114
 
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 static inline int hash_ip6(const struct in6_addr *ip)
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@@ -140,6 +148,11 @@
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 		return NULL;
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 }
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+static int ip_map_upcall(struct cache_detail *cd, struct cache_head *h)
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+{
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+	return sunrpc_cache_pipe_upcall(cd, h);
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+}
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+
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 static void ip_map_request(struct cache_detail *cd,
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 				  struct cache_head *h,
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 				  char **bpp, int *blen)
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@@ -158,7 +171,7 @@
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 }
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172
 
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 static struct ip_map *__ip_map_lookup(struct cache_detail *cd, char *class, struct in6_addr *addr);
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-static int __ip_map_update(struct cache_detail *cd, struct ip_map *ipm, struct unix_domain *udom, time_t expiry);
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+static int __ip_map_update(struct cache_detail *cd, struct ip_map *ipm, struct unix_domain *udom, time64_t expiry);
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175
 
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 static int ip_map_parse(struct cache_detail *cd,
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 			  char *mesg, int mlen)
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@@ -179,7 +192,7 @@
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192
 
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 	struct ip_map *ipmp;
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 	struct auth_domain *dom;
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-	time_t expiry;
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+	time64_t expiry;
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196
 
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 	if (mesg[mlen-1] != '\n')
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 		return -EINVAL;
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@@ -280,9 +293,9 @@
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293
 
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 	strcpy(ip.m_class, class);
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 	ip.m_addr = *addr;
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-	ch = sunrpc_cache_lookup(cd, &ip.h,
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-				 hash_str(class, IP_HASHBITS) ^
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-				 hash_ip6(addr));
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+	ch = sunrpc_cache_lookup_rcu(cd, &ip.h,
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+				     hash_str(class, IP_HASHBITS) ^
298
+				     hash_ip6(addr));
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299
 
287
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 	if (ch)
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 		return container_of(ch, struct ip_map, h);
..
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@@ -300,7 +313,7 @@
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313
 }
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314
 
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 static int __ip_map_update(struct cache_detail *cd, struct ip_map *ipm,
303
-		struct unix_domain *udom, time_t expiry)
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+		struct unix_domain *udom, time64_t expiry)
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317
 {
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 	struct ip_map ip;
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319
 	struct cache_head *ch;
..
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@@ -317,15 +330,6 @@
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 		return -ENOMEM;
318
331
 	cache_put(ch, cd);
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 	return 0;
320
-}
321
-
322
-static inline int ip_map_update(struct net *net, struct ip_map *ipm,
323
-		struct unix_domain *udom, time_t expiry)
324
-{
325
-	struct sunrpc_net *sn;
326
-
327
-	sn = net_generic(net, sunrpc_net_id);
328
-	return __ip_map_update(sn->ip_map_cache, ipm, udom, expiry);
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333
 }
330
334
 
331
335
 void svcauth_unix_purge(struct net *net)
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@@ -412,6 +416,7 @@
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 	struct cache_head	h;
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417
 	kuid_t			uid;
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418
 	struct group_info	*gi;
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+	struct rcu_head		rcu;
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420
 };
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421
 
417
422
 static int unix_gid_hash(kuid_t uid)
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@@ -426,7 +431,7 @@
426
431
 	if (test_bit(CACHE_VALID, &item->flags) &&
427
432
 	    !test_bit(CACHE_NEGATIVE, &item->flags))
428
433
 		put_group_info(ug->gi);
429
-	kfree(ug);
434
+	kfree_rcu(ug, rcu);
430
435
 }
431
436
 
432
437
 static int unix_gid_match(struct cache_head *corig, struct cache_head *cnew)
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@@ -458,6 +463,11 @@
458
463
 		return NULL;
459
464
 }
460
465
 
466
+static int unix_gid_upcall(struct cache_detail *cd, struct cache_head *h)
467
+{
468
+	return sunrpc_cache_pipe_upcall_timeout(cd, h);
469
+}
470
+
461
471
 static void unix_gid_request(struct cache_detail *cd,
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472
 			     struct cache_head *h,
463
473
 			     char **bpp, int *blen)
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@@ -482,7 +492,7 @@
482
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 	int rv;
483
493
 	int i;
484
494
 	int err;
485
-	time_t expiry;
495
+	time64_t expiry;
486
496
 	struct unix_gid ug, *ugp;
487
497
 
488
498
 	if (mesg[mlen - 1] != '\n')
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@@ -492,7 +502,7 @@
492
502
 	rv = get_int(&mesg, &id);
493
503
 	if (rv)
494
504
 		return -EINVAL;
495
-	uid = make_kuid(&init_user_ns, id);
505
+	uid = make_kuid(current_user_ns(), id);
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506
 	ug.uid = uid;
497
507
 
498
508
 	expiry = get_expiry(&mesg);
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@@ -514,7 +524,7 @@
514
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 		err = -EINVAL;
515
525
 		if (rv)
516
526
 			goto out;
517
-		kgid = make_kgid(&init_user_ns, gid);
527
+		kgid = make_kgid(current_user_ns(), gid);
518
528
 		if (!gid_valid(kgid))
519
529
 			goto out;
520
530
 		ug.gi->gid[i] = kgid;
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@@ -547,7 +557,7 @@
547
557
 			 struct cache_detail *cd,
548
558
 			 struct cache_head *h)
549
559
 {
550
-	struct user_namespace *user_ns = &init_user_ns;
560
+	struct user_namespace *user_ns = m->file->f_cred->user_ns;
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561
 	struct unix_gid *ug;
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562
 	int i;
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 	int glen;
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@@ -575,6 +585,7 @@
575
585
 	.hash_size	= GID_HASHMAX,
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 	.name		= "auth.unix.gid",
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587
 	.cache_put	= unix_gid_put,
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+	.cache_upcall	= unix_gid_upcall,
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 	.cache_request	= unix_gid_request,
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 	.cache_parse	= unix_gid_parse,
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591
 	.cache_show	= unix_gid_show,
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@@ -619,7 +630,7 @@
619
630
 	struct cache_head *ch;
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631
 
621
632
 	ug.uid = uid;
622
-	ch = sunrpc_cache_lookup(cd, &ug.h, unix_gid_hash(uid));
633
+	ch = sunrpc_cache_lookup_rcu(cd, &ug.h, unix_gid_hash(uid));
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 	if (ch)
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 		return container_of(ch, struct unix_gid, h);
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 	else
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@@ -788,6 +799,7 @@
788
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 	struct kvec	*argv = &rqstp->rq_arg.head[0];
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 	struct kvec	*resv = &rqstp->rq_res.head[0];
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 	struct svc_cred	*cred = &rqstp->rq_cred;
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+	struct user_namespace *userns;
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 	u32		slen, i;
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 	int		len   = argv->iov_len;
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805
 
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@@ -808,8 +820,10 @@
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820
 	 * (export-specific) anonymous id by nfsd_setuser.
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821
 	 * Supplementary gid's will be left alone.
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822
 	 */
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-	cred->cr_uid = make_kuid(&init_user_ns, svc_getnl(argv)); /* uid */
812
-	cred->cr_gid = make_kgid(&init_user_ns, svc_getnl(argv)); /* gid */
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+	userns = (rqstp->rq_xprt && rqstp->rq_xprt->xpt_cred) ?
824
+		rqstp->rq_xprt->xpt_cred->user_ns : &init_user_ns;
825
+	cred->cr_uid = make_kuid(userns, svc_getnl(argv)); /* uid */
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+	cred->cr_gid = make_kgid(userns, svc_getnl(argv)); /* gid */
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827
 	slen = svc_getnl(argv);			/* gids length */
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828
 	if (slen > UNX_NGROUPS || (len -= (slen + 2)*4) < 0)
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829
 		goto badcred;
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@@ -817,7 +831,7 @@
817
831
 	if (cred->cr_group_info == NULL)
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832
 		return SVC_CLOSE;
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833
 	for (i = 0; i < slen; i++) {
820
-		kgid_t kgid = make_kgid(&init_user_ns, svc_getnl(argv));
834
+		kgid_t kgid = make_kgid(userns, svc_getnl(argv));
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835
 		cred->cr_group_info->gid[i] = kgid;
822
836
 	}
823
837
 	groups_sort(cred->cr_group_info);
..
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@@ -869,6 +883,7 @@
869
883
 	.hash_size	= IP_HASHMAX,
870
884
 	.name		= "auth.unix.ip",
871
885
 	.cache_put	= ip_map_put,
886
+	.cache_upcall	= ip_map_upcall,
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887
 	.cache_request	= ip_map_request,
873
888
 	.cache_parse	= ip_map_parse,
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889
 	.cache_show	= ip_map_show,