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2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/fs/nfsd/nfs3xdr.c
..
..
@@ -27,18 +27,19 @@
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 	NF3SOCK, NF3BAD,  NF3LNK, NF3BAD,
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 };
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29
 
30
+
30
31
 /*
31
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  * XDR functions for basic NFS types
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  */
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 static __be32 *
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-encode_time3(__be32 *p, struct timespec *time)
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+encode_time3(__be32 *p, struct timespec64 *time)
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 {
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 	*p++ = htonl((u32) time->tv_sec); *p++ = htonl(time->tv_nsec);
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 	return p;
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 }
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40
 
40
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 static __be32 *
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-decode_time3(__be32 *p, struct timespec *time)
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+decode_time3(__be32 *p, struct timespec64 *time)
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 {
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 	time->tv_sec = ntohl(*p++);
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 	time->tv_nsec = ntohl(*p++);
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@@ -96,7 +97,7 @@
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 }
97
98
 
98
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 static __be32 *
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-decode_sattr3(__be32 *p, struct iattr *iap)
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+decode_sattr3(__be32 *p, struct iattr *iap, struct user_namespace *userns)
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 {
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 	u32	tmp;
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103
 
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@@ -107,12 +108,12 @@
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 		iap->ia_mode = ntohl(*p++);
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 	}
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 	if (*p++) {
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-		iap->ia_uid = make_kuid(&init_user_ns, ntohl(*p++));
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+		iap->ia_uid = make_kuid(userns, ntohl(*p++));
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 		if (uid_valid(iap->ia_uid))
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 			iap->ia_valid |= ATTR_UID;
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 	}
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 	if (*p++) {
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-		iap->ia_gid = make_kgid(&init_user_ns, ntohl(*p++));
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+		iap->ia_gid = make_kgid(userns, ntohl(*p++));
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 		if (gid_valid(iap->ia_gid))
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 			iap->ia_valid |= ATTR_GID;
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 	}
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@@ -165,12 +166,12 @@
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 encode_fattr3(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp,
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 	      struct kstat *stat)
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 {
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-	struct timespec ts;
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+	struct user_namespace *userns = nfsd_user_namespace(rqstp);
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 	*p++ = htonl(nfs3_ftypes[(stat->mode & S_IFMT) >> 12]);
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 	*p++ = htonl((u32) (stat->mode & S_IALLUGO));
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 	*p++ = htonl((u32) stat->nlink);
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-	*p++ = htonl((u32) from_kuid(&init_user_ns, stat->uid));
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-	*p++ = htonl((u32) from_kgid(&init_user_ns, stat->gid));
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+	*p++ = htonl((u32) from_kuid_munged(userns, stat->uid));
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+	*p++ = htonl((u32) from_kgid_munged(userns, stat->gid));
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 	if (S_ISLNK(stat->mode) && stat->size > NFS3_MAXPATHLEN) {
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 		p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN);
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 	} else {
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@@ -181,12 +182,9 @@
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 	*p++ = htonl((u32) MINOR(stat->rdev));
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 	p = encode_fsid(p, fhp);
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 	p = xdr_encode_hyper(p, stat->ino);
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-	ts = timespec64_to_timespec(stat->atime);
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-	p = encode_time3(p, &ts);
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-	ts = timespec64_to_timespec(stat->mtime);
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-	p = encode_time3(p, &ts);
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-	ts = timespec64_to_timespec(stat->ctime);
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-	p = encode_time3(p, &ts);
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+	p = encode_time3(p, &stat->atime);
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+	p = encode_time3(p, &stat->mtime);
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+	p = encode_time3(p, &stat->ctime);
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188
 
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 	return p;
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 }
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@@ -275,8 +273,8 @@
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 		stat.size  = inode->i_size;
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 	}
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275
 
278
-	fhp->fh_pre_mtime = timespec64_to_timespec(stat.mtime);
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-	fhp->fh_pre_ctime = timespec64_to_timespec(stat.ctime);
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+	fhp->fh_pre_mtime = stat.mtime;
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+	fhp->fh_pre_ctime = stat.ctime;
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 	fhp->fh_pre_size  = stat.size;
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 	fhp->fh_pre_change = nfsd4_change_attribute(&stat, inode);
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 	fhp->fh_pre_saved = true;
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@@ -307,6 +305,12 @@
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  * XDR decode functions
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  */
309
307
 int
308
+nfs3svc_decode_voidarg(struct svc_rqst *rqstp, __be32 *p)
309
+{
310
+	return 1;
311
+}
312
+
313
+int
310
314
 nfs3svc_decode_fhandle(struct svc_rqst *rqstp, __be32 *p)
311
315
 {
312
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 	struct nfsd_fhandle *args = rqstp->rq_argp;
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@@ -325,10 +329,10 @@
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 	p = decode_fh(p, &args->fh);
326
330
 	if (!p)
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 		return 0;
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-	p = decode_sattr3(p, &args->attrs);
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+	p = decode_sattr3(p, &args->attrs, nfsd_user_namespace(rqstp));
329
333
 
330
334
 	if ((args->check_guard = ntohl(*p++)) != 0) { 
331
-		struct timespec time; 
335
+		struct timespec64 time;
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 		p = decode_time3(p, &time);
333
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 		args->guardtime = time.tv_sec;
334
338
 	}
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@@ -455,7 +459,7 @@
455
459
 	switch (args->createmode = ntohl(*p++)) {
456
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 	case NFS3_CREATE_UNCHECKED:
457
461
 	case NFS3_CREATE_GUARDED:
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-		p = decode_sattr3(p, &args->attrs);
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+		p = decode_sattr3(p, &args->attrs, nfsd_user_namespace(rqstp));
459
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 		break;
460
464
 	case NFS3_CREATE_EXCLUSIVE:
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 		args->verf = p;
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@@ -476,7 +480,7 @@
476
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 	if (!(p = decode_fh(p, &args->fh)) ||
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 	    !(p = decode_filename(p, &args->name, &args->len)))
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 		return 0;
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-	p = decode_sattr3(p, &args->attrs);
483
+	p = decode_sattr3(p, &args->attrs, nfsd_user_namespace(rqstp));
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484
 
481
485
 	return xdr_argsize_check(rqstp, p);
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486
 }
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@@ -491,7 +495,7 @@
491
495
 	if (!(p = decode_fh(p, &args->ffh)) ||
492
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 	    !(p = decode_filename(p, &args->fname, &args->flen)))
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 		return 0;
494
-	p = decode_sattr3(p, &args->attrs);
498
+	p = decode_sattr3(p, &args->attrs, nfsd_user_namespace(rqstp));
495
499
 
496
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 	args->tlen = ntohl(*p++);
497
501
 
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@@ -519,7 +523,7 @@
519
523
 
520
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 	if (args->ftype == NF3BLK  || args->ftype == NF3CHR
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 	 || args->ftype == NF3SOCK || args->ftype == NF3FIFO)
522
-		p = decode_sattr3(p, &args->attrs);
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+		p = decode_sattr3(p, &args->attrs, nfsd_user_namespace(rqstp));
523
527
 
524
528
 	if (args->ftype == NF3BLK || args->ftype == NF3CHR) {
525
529
 		args->major = ntohl(*p++);
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@@ -573,6 +577,9 @@
573
577
 nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p)
574
578
 {
575
579
 	struct nfsd3_readdirargs *args = rqstp->rq_argp;
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+	int len;
581
+	u32 max_blocksize = svc_max_payload(rqstp);
582
+
576
583
 	p = decode_fh(p, &args->fh);
577
584
 	if (!p)
578
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 		return 0;
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@@ -580,8 +587,14 @@
580
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 	args->verf   = p; p += 2;
581
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 	args->dircount = ~0;
582
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 	args->count  = ntohl(*p++);
583
-	args->count  = min_t(u32, args->count, PAGE_SIZE);
584
-	args->buffer = page_address(*(rqstp->rq_next_page++));
590
+	len = args->count  = min_t(u32, args->count, max_blocksize);
591
+
592
+	while (len > 0) {
593
+		struct page *p = *(rqstp->rq_next_page++);
594
+		if (!args->buffer)
595
+			args->buffer = page_address(p);
596
+		len -= PAGE_SIZE;
597
+	}
585
598
 
586
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 	return xdr_argsize_check(rqstp, p);
587
600
 }
..
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@@ -628,10 +641,7 @@
628
641
 /*
629
642
  * XDR encode functions
630
643
  */
631
-/*
632
- * There must be an encoding function for void results so svc_process
633
- * will work properly.
634
- */
644
+
635
645
 int
636
646
 nfs3svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p)
637
647
 {
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@@ -644,6 +654,7 @@
644
654
 {
645
655
 	struct nfsd3_attrstat *resp = rqstp->rq_resp;
646
656
 
657
+	*p++ = resp->status;
647
658
 	if (resp->status == 0) {
648
659
 		lease_get_mtime(d_inode(resp->fh.fh_dentry),
649
660
 				&resp->stat.mtime);
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@@ -658,6 +669,7 @@
658
669
 {
659
670
 	struct nfsd3_attrstat *resp = rqstp->rq_resp;
660
671
 
672
+	*p++ = resp->status;
661
673
 	p = encode_wcc_data(rqstp, p, &resp->fh);
662
674
 	return xdr_ressize_check(rqstp, p);
663
675
 }
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@@ -668,6 +680,7 @@
668
680
 {
669
681
 	struct nfsd3_diropres *resp = rqstp->rq_resp;
670
682
 
683
+	*p++ = resp->status;
671
684
 	if (resp->status == 0) {
672
685
 		p = encode_fh(p, &resp->fh);
673
686
 		p = encode_post_op_attr(rqstp, p, &resp->fh);
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@@ -682,6 +695,7 @@
682
695
 {
683
696
 	struct nfsd3_accessres *resp = rqstp->rq_resp;
684
697
 
698
+	*p++ = resp->status;
685
699
 	p = encode_post_op_attr(rqstp, p, &resp->fh);
686
700
 	if (resp->status == 0)
687
701
 		*p++ = htonl(resp->access);
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..
@@ -694,6 +708,7 @@
694
708
 {
695
709
 	struct nfsd3_readlinkres *resp = rqstp->rq_resp;
696
710
 
711
+	*p++ = resp->status;
697
712
 	p = encode_post_op_attr(rqstp, p, &resp->fh);
698
713
 	if (resp->status == 0) {
699
714
 		*p++ = htonl(resp->len);
..
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@@ -716,6 +731,7 @@
716
731
 {
717
732
 	struct nfsd3_readres *resp = rqstp->rq_resp;
718
733
 
734
+	*p++ = resp->status;
719
735
 	p = encode_post_op_attr(rqstp, p, &resp->fh);
720
736
 	if (resp->status == 0) {
721
737
 		*p++ = htonl(resp->count);
..
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@@ -740,15 +756,14 @@
740
756
 nfs3svc_encode_writeres(struct svc_rqst *rqstp, __be32 *p)
741
757
 {
742
758
 	struct nfsd3_writeres *resp = rqstp->rq_resp;
743
-	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
744
759
 
760
+	*p++ = resp->status;
745
761
 	p = encode_wcc_data(rqstp, p, &resp->fh);
746
762
 	if (resp->status == 0) {
747
763
 		*p++ = htonl(resp->count);
748
764
 		*p++ = htonl(resp->committed);
749
-		/* unique identifier, y2038 overflow can be ignored */
750
-		*p++ = htonl((u32)nn->nfssvc_boot.tv_sec);
751
-		*p++ = htonl(nn->nfssvc_boot.tv_nsec);
765
+		*p++ = resp->verf[0];
766
+		*p++ = resp->verf[1];
752
767
 	}
753
768
 	return xdr_ressize_check(rqstp, p);
754
769
 }
..
..
@@ -759,6 +774,7 @@
759
774
 {
760
775
 	struct nfsd3_diropres *resp = rqstp->rq_resp;
761
776
 
777
+	*p++ = resp->status;
762
778
 	if (resp->status == 0) {
763
779
 		*p++ = xdr_one;
764
780
 		p = encode_fh(p, &resp->fh);
..
..
@@ -774,6 +790,7 @@
774
790
 {
775
791
 	struct nfsd3_renameres *resp = rqstp->rq_resp;
776
792
 
793
+	*p++ = resp->status;
777
794
 	p = encode_wcc_data(rqstp, p, &resp->ffh);
778
795
 	p = encode_wcc_data(rqstp, p, &resp->tfh);
779
796
 	return xdr_ressize_check(rqstp, p);
..
..
@@ -785,6 +802,7 @@
785
802
 {
786
803
 	struct nfsd3_linkres *resp = rqstp->rq_resp;
787
804
 
805
+	*p++ = resp->status;
788
806
 	p = encode_post_op_attr(rqstp, p, &resp->fh);
789
807
 	p = encode_wcc_data(rqstp, p, &resp->tfh);
790
808
 	return xdr_ressize_check(rqstp, p);
..
..
@@ -796,6 +814,7 @@
796
814
 {
797
815
 	struct nfsd3_readdirres *resp = rqstp->rq_resp;
798
816
 
817
+	*p++ = resp->status;
799
818
 	p = encode_post_op_attr(rqstp, p, &resp->fh);
800
819
 
801
820
 	if (resp->status == 0) {
..
..
@@ -855,12 +874,10 @@
855
874
 		} else
856
875
 			dchild = dget(dparent);
857
876
 	} else
858
-		dchild = lookup_one_len_unlocked(name, dparent, namlen);
877
+		dchild = lookup_positive_unlocked(name, dparent, namlen);
859
878
 	if (IS_ERR(dchild))
860
879
 		return rv;
861
880
 	if (d_mountpoint(dchild))
862
-		goto out;
863
-	if (d_really_is_negative(dchild))
864
881
 		goto out;
865
882
 	if (dchild->d_inode->i_ino != ino)
866
883
 		goto out;
..
..
@@ -1055,6 +1072,7 @@
1055
1072
 	struct kstatfs	*s = &resp->stats;
1056
1073
 	u64		bs = s->f_bsize;
1057
1074
 
1075
+	*p++ = resp->status;
1058
1076
 	*p++ = xdr_zero;	/* no post_op_attr */
1059
1077
 
1060
1078
 	if (resp->status == 0) {
..
..
@@ -1075,6 +1093,7 @@
1075
1093
 {
1076
1094
 	struct nfsd3_fsinfores *resp = rqstp->rq_resp;
1077
1095
 
1096
+	*p++ = resp->status;
1078
1097
 	*p++ = xdr_zero;	/* no post_op_attr */
1079
1098
 
1080
1099
 	if (resp->status == 0) {
..
..
@@ -1100,6 +1119,7 @@
1100
1119
 {
1101
1120
 	struct nfsd3_pathconfres *resp = rqstp->rq_resp;
1102
1121
 
1122
+	*p++ = resp->status;
1103
1123
 	*p++ = xdr_zero;	/* no post_op_attr */
1104
1124
 
1105
1125
 	if (resp->status == 0) {
..
..
@@ -1119,14 +1139,13 @@
1119
1139
 nfs3svc_encode_commitres(struct svc_rqst *rqstp, __be32 *p)
1120
1140
 {
1121
1141
 	struct nfsd3_commitres *resp = rqstp->rq_resp;
1122
-	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1123
1142
 
1143
+	*p++ = resp->status;
1124
1144
 	p = encode_wcc_data(rqstp, p, &resp->fh);
1125
1145
 	/* Write verifier */
1126
1146
 	if (resp->status == 0) {
1127
-		/* unique identifier, y2038 overflow can be ignored */
1128
-		*p++ = htonl((u32)nn->nfssvc_boot.tv_sec);
1129
-		*p++ = htonl(nn->nfssvc_boot.tv_nsec);
1147
+		*p++ = resp->verf[0];
1148
+		*p++ = resp->verf[1];
1130
1149
 	}
1131
1150
 	return xdr_ressize_check(rqstp, p);
1132
1151
 }