forked from ~ljy/RK356X_SDK_RELEASE
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hc
2024-02-20 ea08eeccae9297f7aabd2ef7f0c2517ac4549acc 
 kernel/fs/cifs/misc.c
....@@ -31,6 +31,10 @@
3131 #include "nterr.h"
3232 #include "cifs_unicode.h"
3333 #include "smb2pdu.h"
34
+#include "cifsfs.h"
35
+#ifdef CONFIG_CIFS_DFS_UPCALL
36
+#include "dns_resolve.h"
37
+#endif
3438 
3539 extern mempool_t *cifs_sm_req_poolp;
3640 extern mempool_t *cifs_req_poolp;
....@@ -99,31 +103,39 @@
99103 	kfree(buf_to_free->serverOS);
100104 	kfree(buf_to_free->serverDomain);
101105 	kfree(buf_to_free->serverNOS);
102
-	kzfree(buf_to_free->password);
106
+	kfree_sensitive(buf_to_free->password);
103107 	kfree(buf_to_free->user_name);
104108 	kfree(buf_to_free->domainName);
105
-	kzfree(buf_to_free->auth_key.response);
109
+	kfree_sensitive(buf_to_free->auth_key.response);
106110 	kfree(buf_to_free->iface_list);
107
-	kzfree(buf_to_free);
111
+	kfree_sensitive(buf_to_free);
108112 }
109113 
110114 struct cifs_tcon *
111115 tconInfoAlloc(void)
112116 {
113117 	struct cifs_tcon *ret_buf;
114
-	ret_buf = kzalloc(sizeof(struct cifs_tcon), GFP_KERNEL);
115
-	if (ret_buf) {
116
-		atomic_inc(&tconInfoAllocCount);
117
-		ret_buf->tidStatus = CifsNew;
118
-		++ret_buf->tc_count;
119
-		INIT_LIST_HEAD(&ret_buf->openFileList);
120
-		INIT_LIST_HEAD(&ret_buf->tcon_list);
121
-		spin_lock_init(&ret_buf->open_file_lock);
122
-		mutex_init(&ret_buf->crfid.fid_mutex);
123
-		ret_buf->crfid.fid = kzalloc(sizeof(struct cifs_fid),
124
-					     GFP_KERNEL);
125
-		spin_lock_init(&ret_buf->stat_lock);
118
+
119
+	ret_buf = kzalloc(sizeof(*ret_buf), GFP_KERNEL);
120
+	if (!ret_buf)
121
+		return NULL;
122
+	ret_buf->crfid.fid = kzalloc(sizeof(*ret_buf->crfid.fid), GFP_KERNEL);
123
+	if (!ret_buf->crfid.fid) {
124
+		kfree(ret_buf);
125
+		return NULL;
126126 	}
127
+
128
+	atomic_inc(&tconInfoAllocCount);
129
+	ret_buf->tidStatus = CifsNew;
130
+	++ret_buf->tc_count;
131
+	INIT_LIST_HEAD(&ret_buf->openFileList);
132
+	INIT_LIST_HEAD(&ret_buf->tcon_list);
133
+	spin_lock_init(&ret_buf->open_file_lock);
134
+	mutex_init(&ret_buf->crfid.fid_mutex);
135
+	spin_lock_init(&ret_buf->stat_lock);
136
+	atomic_set(&ret_buf->num_local_opens, 0);
137
+	atomic_set(&ret_buf->num_remote_opens, 0);
138
+
127139 	return ret_buf;
128140 }
129141 
....@@ -136,8 +148,11 @@
136148 	}
137149 	atomic_dec(&tconInfoAllocCount);
138150 	kfree(buf_to_free->nativeFileSystem);
139
-	kzfree(buf_to_free->password);
151
+	kfree_sensitive(buf_to_free->password);
140152 	kfree(buf_to_free->crfid.fid);
153
+#ifdef CONFIG_CIFS_DFS_UPCALL
154
+	kfree(buf_to_free->dfs_path);
155
+#endif
141156 	kfree(buf_to_free);
142157 }
143158 
....@@ -409,7 +424,7 @@
409424 
410425 			if (data_offset >
411426 			    len - sizeof(struct file_notify_information)) {
412
-				cifs_dbg(FYI, "invalid data_offset %u\n",
427
+				cifs_dbg(FYI, "Invalid data_offset %u\n",
413428 					 data_offset);
414429 				return true;
415430 			}
....@@ -437,7 +452,7 @@
437452 		   large dirty files cached on the client */
438453 		if ((NT_STATUS_INVALID_HANDLE) ==
439454 		   le32_to_cpu(pSMB->hdr.Status.CifsError)) {
440
-			cifs_dbg(FYI, "invalid handle on oplock break\n");
455
+			cifs_dbg(FYI, "Invalid handle on oplock break\n");
441456 			return true;
442457 		} else if (ERRbadfid ==
443458 		   le16_to_cpu(pSMB->hdr.Status.DosError.Error)) {
....@@ -511,10 +526,18 @@
511526 cifs_autodisable_serverino(struct cifs_sb_info *cifs_sb)
512527 {
513528 	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
529
+		struct cifs_tcon *tcon = NULL;
530
+
531
+		if (cifs_sb->master_tlink)
532
+			tcon = cifs_sb_master_tcon(cifs_sb);
533
+
514534 		cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
515535 		cifs_sb->mnt_cifs_serverino_autodisabled = true;
516
-		cifs_dbg(VFS, "Autodisabling the use of server inode numbers on %s. This server doesn't seem to support them properly. Hardlinks will not be recognized on this mount. Consider mounting with the \"noserverino\" option to silence this message.\n",
517
-			 cifs_sb_master_tcon(cifs_sb)->treeName);
536
+		cifs_dbg(VFS, "Autodisabling the use of server inode numbers on %s\n",
537
+			 tcon ? tcon->treeName : "new server");
538
+		cifs_dbg(VFS, "The server doesn't seem to support them properly or the files might be on different servers (DFS)\n");
539
+		cifs_dbg(VFS, "Hardlinks will not be recognized on this mount. Consider mounting with the \"noserverino\" option to silence this message.\n");
540
+
518541 	}
519542 }
520543 
....@@ -741,6 +764,8 @@
741764 			goto parse_DFS_referrals_exit;
742765 		}
743766 
767
+		node->ttl = le32_to_cpu(ref->TimeToLive);
768
+
744769 		ref++;
745770 	}
746771 
....@@ -758,6 +783,11 @@
758783 {
759784 	struct cifs_aio_ctx *ctx;
760785 
786
+	/*
787
+	 * Must use kzalloc to initialize ctx->bv to NULL and ctx->direct_io
788
+	 * to false so that we know when we have to unreference pages within
789
+	 * cifs_aio_ctx_release()
790
+	 */
761791 	ctx = kzalloc(sizeof(struct cifs_aio_ctx), GFP_KERNEL);
762792 	if (!ctx)
763793 		return NULL;
....@@ -776,7 +806,23 @@
776806 					struct cifs_aio_ctx, refcount);
777807 
778808 	cifsFileInfo_put(ctx->cfile);
779
-	kvfree(ctx->bv);
809
+
810
+	/*
811
+	 * ctx->bv is only set if setup_aio_ctx_iter() was call successfuly
812
+	 * which means that iov_iter_get_pages() was a success and thus that
813
+	 * we have taken reference on pages.
814
+	 */
815
+	if (ctx->bv) {
816
+		unsigned i;
817
+
818
+		for (i = 0; i < ctx->npages; i++) {
819
+			if (ctx->should_dirty)
820
+				set_page_dirty(ctx->bv[i].bv_page);
821
+			put_page(ctx->bv[i].bv_page);
822
+		}
823
+		kvfree(ctx->bv);
824
+	}
825
+
780826 	kfree(ctx);
781827 }
782828 
....@@ -797,29 +843,27 @@
797843 	struct page **pages = NULL;
798844 	struct bio_vec *bv = NULL;
799845 
800
-	if (iter->type & ITER_KVEC) {
801
-		memcpy(&ctx->iter, iter, sizeof(struct iov_iter));
846
+	if (iov_iter_is_kvec(iter)) {
847
+		memcpy(&ctx->iter, iter, sizeof(*iter));
802848 		ctx->len = count;
803849 		iov_iter_advance(iter, count);
804850 		return 0;
805851 	}
806852 
807
-	if (max_pages * sizeof(struct bio_vec) <= CIFS_AIO_KMALLOC_LIMIT)
808
-		bv = kmalloc_array(max_pages, sizeof(struct bio_vec),
809
-				   GFP_KERNEL);
853
+	if (array_size(max_pages, sizeof(*bv)) <= CIFS_AIO_KMALLOC_LIMIT)
854
+		bv = kmalloc_array(max_pages, sizeof(*bv), GFP_KERNEL);
810855 
811856 	if (!bv) {
812
-		bv = vmalloc(array_size(max_pages, sizeof(struct bio_vec)));
857
+		bv = vmalloc(array_size(max_pages, sizeof(*bv)));
813858 		if (!bv)
814859 			return -ENOMEM;
815860 	}
816861 
817
-	if (max_pages * sizeof(struct page *) <= CIFS_AIO_KMALLOC_LIMIT)
818
-		pages = kmalloc_array(max_pages, sizeof(struct page *),
819
-				      GFP_KERNEL);
862
+	if (array_size(max_pages, sizeof(*pages)) <= CIFS_AIO_KMALLOC_LIMIT)
863
+		pages = kmalloc_array(max_pages, sizeof(*pages), GFP_KERNEL);
820864 
821865 	if (!pages) {
822
-		pages = vmalloc(array_size(max_pages, sizeof(struct page *)));
866
+		pages = vmalloc(array_size(max_pages, sizeof(*pages)));
823867 		if (!pages) {
824868 			kvfree(bv);
825869 			return -ENOMEM;
....@@ -831,7 +875,7 @@
831875 	while (count && npages < max_pages) {
832876 		rc = iov_iter_get_pages(iter, pages, count, max_pages, &start);
833877 		if (rc < 0) {
834
-			cifs_dbg(VFS, "couldn't get user pages (rc=%zd)\n", rc);
878
+			cifs_dbg(VFS, "Couldn't get user pages (rc=%zd)\n", rc);
835879 			break;
836880 		}
837881 
....@@ -868,7 +912,7 @@
868912 	ctx->bv = bv;
869913 	ctx->len = saved_len - count;
870914 	ctx->npages = npages;
871
-	iov_iter_bvec(&ctx->iter, ITER_BVEC | rw, ctx->bv, npages, ctx->len);
915
+	iov_iter_bvec(&ctx->iter, rw, ctx->bv, npages, ctx->len);
872916 	return 0;
873917 }
874918 
....@@ -890,7 +934,7 @@
890934 
891935 	*shash = crypto_alloc_shash(name, 0, 0);
892936 	if (IS_ERR(*shash)) {
893
-		cifs_dbg(VFS, "could not allocate crypto %s\n", name);
937
+		cifs_dbg(VFS, "Could not allocate crypto %s\n", name);
894938 		rc = PTR_ERR(*shash);
895939 		*shash = NULL;
896940 		*sdesc = NULL;
....@@ -907,7 +951,6 @@
907951 	}
908952 
909953 	(*sdesc)->shash.tfm = *shash;
910
-	(*sdesc)->shash.flags = 0x0;
911954 	return 0;
912955 }
913956 
....@@ -931,8 +974,8 @@
931974  * Input: rqst - a smb_rqst, page - a page index for rqst
932975  * Output: *len - the length for this page, *offset - the offset for this page
933976  */
934
-void rqst_page_get_length(struct smb_rqst *rqst, unsigned int page,
935
-				unsigned int *len, unsigned int *offset)
977
+void rqst_page_get_length(const struct smb_rqst *rqst, unsigned int page,
978
+			  unsigned int *len, unsigned int *offset)
936979 {
937980 	*len = rqst->rq_pagesz;
938981 	*offset = (page == 0) ? rqst->rq_offset : 0;
....@@ -942,3 +985,218 @@
942985 	else if (page == 0)
943986 		*len = rqst->rq_pagesz - rqst->rq_offset;
944987 }
988
+
989
+void extract_unc_hostname(const char *unc, const char **h, size_t *len)
990
+{
991
+	const char *end;
992
+
993
+	/* skip initial slashes */
994
+	while (*unc && (*unc == '\\' || *unc == '/'))
995
+		unc++;
996
+
997
+	end = unc;
998
+
999
+	while (*end && !(*end == '\\' || *end == '/'))
1000
+		end++;
1001
+
1002
+	*h = unc;
1003
+	*len = end - unc;
1004
+}
1005
+
1006
+/**
1007
+ * copy_path_name - copy src path to dst, possibly truncating
1008
+ *
1009
+ * returns number of bytes written (including trailing nul)
1010
+ */
1011
+int copy_path_name(char *dst, const char *src)
1012
+{
1013
+	int name_len;
1014
+
1015
+	/*
1016
+	 * PATH_MAX includes nul, so if strlen(src) >= PATH_MAX it
1017
+	 * will truncate and strlen(dst) will be PATH_MAX-1
1018
+	 */
1019
+	name_len = strscpy(dst, src, PATH_MAX);
1020
+	if (WARN_ON_ONCE(name_len < 0))
1021
+		name_len = PATH_MAX-1;
1022
+
1023
+	/* we count the trailing nul */
1024
+	name_len++;
1025
+	return name_len;
1026
+}
1027
+
1028
+struct super_cb_data {
1029
+	void *data;
1030
+	struct super_block *sb;
1031
+};
1032
+
1033
+static void tcp_super_cb(struct super_block *sb, void *arg)
1034
+{
1035
+	struct super_cb_data *sd = arg;
1036
+	struct TCP_Server_Info *server = sd->data;
1037
+	struct cifs_sb_info *cifs_sb;
1038
+	struct cifs_tcon *tcon;
1039
+
1040
+	if (sd->sb)
1041
+		return;
1042
+
1043
+	cifs_sb = CIFS_SB(sb);
1044
+	tcon = cifs_sb_master_tcon(cifs_sb);
1045
+	if (tcon->ses->server == server)
1046
+		sd->sb = sb;
1047
+}
1048
+
1049
+static struct super_block *__cifs_get_super(void (*f)(struct super_block *, void *),
1050
+					    void *data)
1051
+{
1052
+	struct super_cb_data sd = {
1053
+		.data = data,
1054
+		.sb = NULL,
1055
+	};
1056
+	struct file_system_type **fs_type = (struct file_system_type *[]) {
1057
+		&cifs_fs_type, &smb3_fs_type, NULL,
1058
+	};
1059
+
1060
+	for (; *fs_type; fs_type++) {
1061
+		iterate_supers_type(*fs_type, f, &sd);
1062
+		if (sd.sb) {
1063
+			/*
1064
+			 * Grab an active reference in order to prevent automounts (DFS links)
1065
+			 * of expiring and then freeing up our cifs superblock pointer while
1066
+			 * we're doing failover.
1067
+			 */
1068
+			cifs_sb_active(sd.sb);
1069
+			return sd.sb;
1070
+		}
1071
+	}
1072
+	return ERR_PTR(-EINVAL);
1073
+}
1074
+
1075
+static void __cifs_put_super(struct super_block *sb)
1076
+{
1077
+	if (!IS_ERR_OR_NULL(sb))
1078
+		cifs_sb_deactive(sb);
1079
+}
1080
+
1081
+struct super_block *cifs_get_tcp_super(struct TCP_Server_Info *server)
1082
+{
1083
+	return __cifs_get_super(tcp_super_cb, server);
1084
+}
1085
+
1086
+void cifs_put_tcp_super(struct super_block *sb)
1087
+{
1088
+	__cifs_put_super(sb);
1089
+}
1090
+
1091
+#ifdef CONFIG_CIFS_DFS_UPCALL
1092
+int match_target_ip(struct TCP_Server_Info *server,
1093
+		    const char *share, size_t share_len,
1094
+		    bool *result)
1095
+{
1096
+	int rc;
1097
+	char *target, *tip = NULL;
1098
+	struct sockaddr tipaddr;
1099
+
1100
+	*result = false;
1101
+
1102
+	target = kzalloc(share_len + 3, GFP_KERNEL);
1103
+	if (!target) {
1104
+		rc = -ENOMEM;
1105
+		goto out;
1106
+	}
1107
+
1108
+	scnprintf(target, share_len + 3, "\\\\%.*s", (int)share_len, share);
1109
+
1110
+	cifs_dbg(FYI, "%s: target name: %s\n", __func__, target + 2);
1111
+
1112
+	rc = dns_resolve_server_name_to_ip(target, &tip);
1113
+	if (rc < 0)
1114
+		goto out;
1115
+
1116
+	cifs_dbg(FYI, "%s: target ip: %s\n", __func__, tip);
1117
+
1118
+	if (!cifs_convert_address(&tipaddr, tip, strlen(tip))) {
1119
+		cifs_dbg(VFS, "%s: failed to convert target ip address\n",
1120
+			 __func__);
1121
+		rc = -EINVAL;
1122
+		goto out;
1123
+	}
1124
+
1125
+	*result = cifs_match_ipaddr((struct sockaddr *)&server->dstaddr,
1126
+				    &tipaddr);
1127
+	cifs_dbg(FYI, "%s: ip addresses match: %u\n", __func__, *result);
1128
+	rc = 0;
1129
+
1130
+out:
1131
+	kfree(target);
1132
+	kfree(tip);
1133
+
1134
+	return rc;
1135
+}
1136
+
1137
+static void tcon_super_cb(struct super_block *sb, void *arg)
1138
+{
1139
+	struct super_cb_data *sd = arg;
1140
+	struct cifs_tcon *tcon = sd->data;
1141
+	struct cifs_sb_info *cifs_sb;
1142
+
1143
+	if (sd->sb)
1144
+		return;
1145
+
1146
+	cifs_sb = CIFS_SB(sb);
1147
+	if (tcon->dfs_path && cifs_sb->origin_fullpath &&
1148
+	    !strcasecmp(tcon->dfs_path, cifs_sb->origin_fullpath))
1149
+		sd->sb = sb;
1150
+}
1151
+
1152
+static inline struct super_block *cifs_get_tcon_super(struct cifs_tcon *tcon)
1153
+{
1154
+	return __cifs_get_super(tcon_super_cb, tcon);
1155
+}
1156
+
1157
+static inline void cifs_put_tcon_super(struct super_block *sb)
1158
+{
1159
+	__cifs_put_super(sb);
1160
+}
1161
+#else
1162
+static inline struct super_block *cifs_get_tcon_super(struct cifs_tcon *tcon)
1163
+{
1164
+	return ERR_PTR(-EOPNOTSUPP);
1165
+}
1166
+
1167
+static inline void cifs_put_tcon_super(struct super_block *sb)
1168
+{
1169
+}
1170
+#endif
1171
+
1172
+int update_super_prepath(struct cifs_tcon *tcon, char *prefix)
1173
+{
1174
+	struct super_block *sb;
1175
+	struct cifs_sb_info *cifs_sb;
1176
+	int rc = 0;
1177
+
1178
+	sb = cifs_get_tcon_super(tcon);
1179
+	if (IS_ERR(sb))
1180
+		return PTR_ERR(sb);
1181
+
1182
+	cifs_sb = CIFS_SB(sb);
1183
+
1184
+	kfree(cifs_sb->prepath);
1185
+
1186
+	if (prefix && *prefix) {
1187
+		cifs_sb->prepath = kstrndup(prefix, strlen(prefix), GFP_ATOMIC);
1188
+		if (!cifs_sb->prepath) {
1189
+			rc = -ENOMEM;
1190
+			goto out;
1191
+		}
1192
+
1193
+		convert_delimiter(cifs_sb->prepath, CIFS_DIR_SEP(cifs_sb));
1194
+	} else
1195
+		cifs_sb->prepath = NULL;
1196
+
1197
+	cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH;
1198
+
1199
+out:
1200
+	cifs_put_tcon_super(sb);
1201
+	return rc;
1202
+}