SERVER-67881 : Check unsupported regular expression options in BSON documents in the validate command.

2 files changed, 63 insertions, 0 deletions

diff --git a/jstests/disk/libs/wt_file_helper.js b/jstests/disk/libs/wt_file_helper.js
index adf05b779ed..e21c4bf1375 100644
--- a/jstests/disk/libs/wt_file_helper.js
+++ b/jstests/disk/libs/wt_file_helper.js
@@ -319,4 +319,38 @@ let insertDocSymbolField = function(coll, uri, conn, numDocs) {
         }
     };
     rewriteTable(uri, conn, makeSymbolField);
+};
+
+/**
+ * Inserts documents with invalid regex options into the MongoDB server.
+ */
+let insertInvalidRegex = function(coll, mongod, nDocuments) {
+    const regex = "a*.conn";
+    const options = 'gimsuy';
+
+    // First, insert valid expressions which will not be rejected by the JS interpreter.
+    for (let i = 0; i < nDocuments; i++) {
+        coll.insert({a: RegExp(regex, options)});
+    }
+
+    // Insert one valid expression and 4 invalid expressions.
+    let swapOptions = function(lines) {
+        const toInsert = ["imlsux", "imzsux", "xuslmi", "amlsux"];
+        const offsetToOptionStr = 64;
+        const toHexStr = function(str) {
+            return str.split('')
+                .map((a) => {
+                    return a.charCodeAt(0).toString(16);
+                })
+                .join('');
+        };
+
+        let modifiedOptions;
+        for (let i = wtHeaderLines; i < lines.length; i += 2) {
+            modifiedOptions = toHexStr(toInsert[((i - wtHeaderLines) / 2) % toInsert.length]);
+            lines[i] = lines[i].substring(0, offsetToOptionStr) + modifiedOptions +
+                lines[i].substring(offsetToOptionStr + modifiedOptions.length);
+        }
+    };
+    rewriteTable(getUriForColl(coll), mongod, swapOptions);
 };
\ No newline at end of file
diff --git a/jstests/disk/validate_bson_inconsistency.js b/jstests/disk/validate_bson_inconsistency.js
index d29ae740f8c..e16faf3527f 100644
--- a/jstests/disk/validate_bson_inconsistency.js
+++ b/jstests/disk/validate_bson_inconsistency.js
@@ -66,6 +66,35 @@ resetDbpath(dbpath);
     MongoRunner.stopMongod(mongod, null, {skipValidation: true});
 })();
 
+(function validateDocumentsInvalidRegexOptions() {
+    let mongod = startMongodOnExistingPath(dbpath);
+    let db = mongod.getDB(baseName);
+
+    const collName = collNamePrefix + count++;
+    db.getCollection(collName).drop();
+    assert.commandWorked(db.createCollection(collName));
+    let coll = db[collName];
+
+    jsTestLog(
+        "Checks that issues are found when we validate regex expressions with invalid options.");
+    insertInvalidRegex(coll, mongod, 5);
+    mongod = startMongodOnExistingPath(dbpath);
+    db = mongod.getDB(baseName);
+    coll = db[collName];
+
+    let res = coll.validate({checkBSONConsistency: false});
+    assert(res.valid, tojson(res));
+    assert.eq(res.nNonCompliantDocuments, 5);
+    assert.eq(res.warnings.length, 1);
+
+    res = coll.validate({checkBSONConsistency: true});
+    assert(res.valid, tojson(res));
+    assert.eq(res.nNonCompliantDocuments, 5);
+    assert.eq(res.warnings.length, 1);
+
+    MongoRunner.stopMongod(mongod, null, {skipValidation: true});
+})();
+
 (function validateDocumentsInvalidMD5Length() {
     jsTestLog("Validate document with invalid MD5 length");