Convert newlines to spaces in names written in v11+ pg_dump comments.

Maliciously-crafted object names could achieve SQL injection during
restore.  CVE-2012-0868 fixed this class of problem at the time, but
later work reintroduced three cases.  Commit
bc8cd50fef (back-patched to v11+ in
2023-05 releases) introduced the pg_dump case.  Commit
6cbdbd9e8d (v12+) introduced the two
pg_dumpall cases.  Move sanitize_line(), unchanged, to dumputils.c so
pg_dumpall has access to it in all supported versions.  Back-patch to
v13 (all supported versions).

Reviewed-by: Robert Haas <robertmhaas@gmail.com>
Reviewed-by: Nathan Bossart <nathandbossart@gmail.com>
Backpatch-through: 13
Security: CVE-2025-8715

src/bin/pg_dump/dumputils.c

@@ -31,6 +31,43 @@ static void AddAcl(PQExpBuffer aclbuf, const char *keyword,
 				   const char *subname);
 
 
+/*
+ * Sanitize a string to be included in an SQL comment or TOC listing, by
+ * replacing any newlines with spaces.  This ensures each logical output line
+ * is in fact one physical output line, to prevent corruption of the dump
+ * (which could, in the worst case, present an SQL injection vulnerability
+ * if someone were to incautiously load a dump containing objects with
+ * maliciously crafted names).
+ *
+ * The result is a freshly malloc'd string.  If the input string is NULL,
+ * return a malloc'ed empty string, unless want_hyphen, in which case return a
+ * malloc'ed hyphen.
+ *
+ * Note that we currently don't bother to quote names, meaning that the name
+ * fields aren't automatically parseable.  "pg_restore -L" doesn't care because
+ * it only examines the dumpId field, but someday we might want to try harder.
+ */
+char *
+sanitize_line(const char *str, bool want_hyphen)
+{
+	char	   *result;
+	char	   *s;
+
+	if (!str)
+		return pg_strdup(want_hyphen ? "-" : "");
+
+	result = pg_strdup(str);
+
+	for (s = result; *s != '\0'; s++)
+	{
+		if (*s == '\n' || *s == '\r')
+			*s = ' ';
+	}
+
+	return result;
+}
+
+
 /*
  * Build GRANT/REVOKE command(s) for an object.
  *

src/bin/pg_dump/dumputils.h

@@ -36,6 +36,7 @@
 #endif
 
 
+extern char *sanitize_line(const char *str, bool want_hyphen);
 extern bool buildACLCommands(const char *name, const char *subname, const char *nspname,
 							 const char *type, const char *acls, const char *baseacls,
 							 const char *owner, const char *prefix, int remoteVersion,

src/bin/pg_dump/pg_backup_archiver.c

@@ -57,7 +57,6 @@ static ArchiveHandle *_allocAH(const char *FileSpec, const ArchiveFormat fmt,
 							   DataDirSyncMethod sync_method);
 static void _getObjectDescription(PQExpBuffer buf, const TocEntry *te);
 static void _printTocEntry(ArchiveHandle *AH, TocEntry *te, const char *pfx);
-static char *sanitize_line(const char *str, bool want_hyphen);
 static void _doSetFixedOutputState(ArchiveHandle *AH);
 static void _doSetSessionAuth(ArchiveHandle *AH, const char *user);
 static void _reconnectToDB(ArchiveHandle *AH, const char *dbname);
@@ -4035,42 +4034,6 @@ _printTocEntry(ArchiveHandle *AH, TocEntry *te, const char *pfx)
 	}
 }
 
-/*
- * Sanitize a string to be included in an SQL comment or TOC listing, by
- * replacing any newlines with spaces.  This ensures each logical output line
- * is in fact one physical output line, to prevent corruption of the dump
- * (which could, in the worst case, present an SQL injection vulnerability
- * if someone were to incautiously load a dump containing objects with
- * maliciously crafted names).
- *
- * The result is a freshly malloc'd string.  If the input string is NULL,
- * return a malloc'ed empty string, unless want_hyphen, in which case return a
- * malloc'ed hyphen.
- *
- * Note that we currently don't bother to quote names, meaning that the name
- * fields aren't automatically parseable.  "pg_restore -L" doesn't care because
- * it only examines the dumpId field, but someday we might want to try harder.
- */
-static char *
-sanitize_line(const char *str, bool want_hyphen)
-{
-	char	   *result;
-	char	   *s;
-
-	if (!str)
-		return pg_strdup(want_hyphen ? "-" : "");
-
-	result = pg_strdup(str);
-
-	for (s = result; *s != '\0'; s++)
-	{
-		if (*s == '\n' || *s == '\r')
-			*s = ' ';
-	}
-
-	return result;
-}
-
 /*
  * Write the file header for a custom-format archive
  */

src/bin/pg_dump/pg_dump.c

@@ -2802,11 +2802,14 @@ dumpTableData(Archive *fout, const TableDataInfo *tdinfo)
 		 forcePartitionRootLoad(tbinfo)))
 	{
 		TableInfo  *parentTbinfo;
+		char	   *sanitized;
 
 		parentTbinfo = getRootTableInfo(tbinfo);
 		copyFrom = fmtQualifiedDumpable(parentTbinfo);
+		sanitized = sanitize_line(copyFrom, true);
 		printfPQExpBuffer(copyBuf, "-- load via partition root %s",
-						  copyFrom);
+						  sanitized);
+		free(sanitized);
 		tdDefn = pg_strdup(copyBuf->data);
 	}
 	else

src/bin/pg_dump/pg_dumpall.c

@@ -1492,7 +1492,13 @@ dumpUserConfig(PGconn *conn, const char *username)
 	res = executeQuery(conn, buf->data);
 
 	if (PQntuples(res) > 0)
-		fprintf(OPF, "\n--\n-- User Config \"%s\"\n--\n\n", username);
+	{
+		char	   *sanitized;
+
+		sanitized = sanitize_line(username, true);
+		fprintf(OPF, "\n--\n-- User Config \"%s\"\n--\n\n", sanitized);
+		free(sanitized);
+	}
 
 	for (int i = 0; i < PQntuples(res); i++)
 	{
@@ -1594,6 +1600,7 @@ dumpDatabases(PGconn *conn)
 	for (i = 0; i < PQntuples(res); i++)
 	{
 		char	   *dbname = PQgetvalue(res, i, 0);
+		char	   *sanitized;
 		const char *create_opts;
 		int			ret;
 
@@ -1610,7 +1617,9 @@ dumpDatabases(PGconn *conn)
 
 		pg_log_info("dumping database \"%s\"", dbname);
 
-		fprintf(OPF, "--\n-- Database \"%s\" dump\n--\n\n", dbname);
+		sanitized = sanitize_line(dbname, true);
+		fprintf(OPF, "--\n-- Database \"%s\" dump\n--\n\n", sanitized);
+		free(sanitized);
 
 		/*
 		 * We assume that "template1" and "postgres" already exist in the

src/bin/pg_dump/t/002_pg_dump.pl

@@ -2222,6 +2222,27 @@ my %tests = (
 		},
 	},
 
+	'newline of role or table name in comment' => {
+		create_sql => qq{CREATE ROLE regress_newline;
+						 ALTER ROLE regress_newline SET enable_seqscan = off;
+						 ALTER ROLE regress_newline
+							RENAME TO "regress_newline\nattack";
+
+						 -- meet getPartitioningInfo() "unsafe" condition
+						 CREATE TYPE pp_colors AS
+							ENUM ('green', 'blue', 'black');
+						 CREATE TABLE pp_enumpart (a pp_colors)
+							PARTITION BY HASH (a);
+						 CREATE TABLE pp_enumpart1 PARTITION OF pp_enumpart
+							FOR VALUES WITH (MODULUS 2, REMAINDER 0);
+						 CREATE TABLE pp_enumpart2 PARTITION OF pp_enumpart
+							FOR VALUES WITH (MODULUS 2, REMAINDER 1);
+						 ALTER TABLE pp_enumpart
+							RENAME TO "pp_enumpart\nattack";},
+		regexp => qr/\n--[^\n]*\nattack/s,
+		like => {},
+	},
+
 	'CREATE TABLESPACE regress_dump_tablespace' => {
 		create_order => 2,
 		create_sql => q(

src/bin/pg_dump/t/003_pg_dump_with_server.pl

@@ -16,6 +16,22 @@ my $port = $node->port;
 $node->init;
 $node->start;
 
+#########################################
+# pg_dumpall: newline in database name
+
+$node->safe_psql('postgres', qq{CREATE DATABASE "regress_\nattack"});
+
+my (@cmd, $stdout, $stderr);
+@cmd = ("pg_dumpall", '--port' => $port, '--exclude-database=postgres');
+print("# Running: " . join(" ", @cmd) . "\n");
+my $result = IPC::Run::run \@cmd, '>' => \$stdout, '2>' => \$stderr;
+ok(!$result, "newline in dbname: exit code not 0");
+like(
+	$stderr,
+	qr/shell command argument contains a newline/,
+	"newline in dbname: stderr matches");
+unlike($stdout, qr/^attack/m, "newline in dbname: no comment escape");
+
 #########################################
 # Verify that dumping foreign data includes only foreign tables of
 # matching servers