diff --git a/test/fixtures/permission/fs-read.js b/test/fixtures/permission/fs-read.js
index ddde4593204..b189af29579 100644
--- a/test/fixtures/permission/fs-read.js
+++ b/test/fixtures/permission/fs-read.js
@@ -21,6 +21,11 @@ const regularFile = __filename;
     permission: 'FileSystemRead',
     resource: path.toNamespacedPath(blockedFile),
   }));
+  fs.readFile(bufferBlockedFile, common.expectsError({
+    code: 'ERR_ACCESS_DENIED',
+    permission: 'FileSystemRead',
+    resource: path.toNamespacedPath(blockedFile),
+  }));
   assert.throws(() => {
     fs.readFileSync(blockedFile);
   }, common.expectsError({
@@ -79,6 +84,11 @@ const regularFile = __filename;
     permission: 'FileSystemRead',
     resource: path.toNamespacedPath(blockedFile),
   }));
+  fs.stat(bufferBlockedFile, common.expectsError({
+    code: 'ERR_ACCESS_DENIED',
+    permission: 'FileSystemRead',
+    resource: path.toNamespacedPath(blockedFile),
+  }));
   assert.throws(() => {
     fs.statSync(blockedFile);
   }, common.expectsError({
@@ -112,6 +122,11 @@ const regularFile = __filename;
     permission: 'FileSystemRead',
     resource: path.toNamespacedPath(blockedFile),
   }));
+  fs.access(bufferBlockedFile, fs.constants.R_OK, common.expectsError({
+    code: 'ERR_ACCESS_DENIED',
+    permission: 'FileSystemRead',
+    resource: path.toNamespacedPath(blockedFile),
+  }));
   assert.throws(() => {
     fs.accessSync(blockedFileURL, fs.constants.R_OK);
   }, common.expectsError({
@@ -140,6 +155,11 @@ const regularFile = __filename;
     permission: 'FileSystemRead',
     resource: path.toNamespacedPath(blockedFile),
   }));
+  fs.copyFile(bufferBlockedFile, path.join(blockedFolder, 'any-other-file'), common.expectsError({
+    code: 'ERR_ACCESS_DENIED',
+    permission: 'FileSystemRead',
+    resource: path.toNamespacedPath(blockedFile),
+  }));
   assert.throws(() => {
     fs.copyFileSync(blockedFileURL, path.join(blockedFolder, 'any-other-file'));
   }, common.expectsError({
@@ -165,6 +185,13 @@ const regularFile = __filename;
     permission: 'FileSystemRead',
     resource: path.toNamespacedPath(blockedFile),
   }));
+  assert.throws(() => {
+    fs.cpSync(bufferBlockedFile, path.join(blockedFolder, 'any-other-file'));
+  }, common.expectsError({
+    code: 'ERR_ACCESS_DENIED',
+    permission: 'FileSystemRead',
+    resource: path.toNamespacedPath(blockedFile),
+  }));
   assert.throws(() => {
     fs.cpSync(blockedFileURL, path.join(blockedFolder, 'any-other-file'));
   }, common.expectsError({
@@ -188,6 +215,11 @@ const regularFile = __filename;
     permission: 'FileSystemRead',
     resource: path.toNamespacedPath(blockedFile),
   }));
+  fs.open(bufferBlockedFile, 'r', common.expectsError({
+    code: 'ERR_ACCESS_DENIED',
+    permission: 'FileSystemRead',
+    resource: path.toNamespacedPath(blockedFile),
+  }));
   assert.throws(() => {
     fs.openSync(blockedFileURL, 'r');
   }, common.expectsError({
@@ -312,6 +344,11 @@ const regularFile = __filename;
     permission: 'FileSystemRead',
     resource: path.toNamespacedPath(blockedFile),
   }));
+  fs.rename(bufferBlockedFile, 'newfile', common.expectsError({
+    code: 'ERR_ACCESS_DENIED',
+    permission: 'FileSystemRead',
+    resource: path.toNamespacedPath(blockedFile),
+  }));
   assert.throws(() => {
     fs.renameSync(blockedFile, 'newfile');
   }, common.expectsError({
@@ -337,6 +374,13 @@ const regularFile = __filename;
     permission: 'FileSystemRead',
     resource: path.toNamespacedPath(blockedFile),
   }));
+  assert.throws(() => {
+    fs.openAsBlob(bufferBlockedFile);
+  }, common.expectsError({
+    code: 'ERR_ACCESS_DENIED',
+    permission: 'FileSystemRead',
+    resource: path.toNamespacedPath(blockedFile),
+  }));
   assert.throws(() => {
     fs.openAsBlob(blockedFileURL);
   }, common.expectsError({
@@ -371,6 +415,11 @@ const regularFile = __filename;
     permission: 'FileSystemRead',
     resource: path.toNamespacedPath(blockedFile),
   }));
+  fs.statfs(bufferBlockedFile, common.expectsError({
+    code: 'ERR_ACCESS_DENIED',
+    permission: 'FileSystemRead',
+    resource: path.toNamespacedPath(blockedFile),
+  }));
   assert.throws(() => {
     fs.statfsSync(blockedFile);
   }, common.expectsError({
@@ -405,6 +454,11 @@ const regularFile = __filename;
   }, common.expectsError({
     code: 'ERR_ACCESS_DENIED',
   }));
+  assert.throws(() => {
+    fs.lstatSync(bufferBlockedFile);
+  }, common.expectsError({
+    code: 'ERR_ACCESS_DENIED',
+  }));
   assert.throws(() => {
     fs.lstatSync(path.join(blockedFolder, 'anyfile'));
   }, common.expectsError({
diff --git a/test/fixtures/permission/fs-write.js b/test/fixtures/permission/fs-write.js
index 31e96860972..0c0ec726020 100644
--- a/test/fixtures/permission/fs-write.js
+++ b/test/fixtures/permission/fs-write.js
@@ -11,6 +11,7 @@ const regularFolder = process.env.ALLOWEDFOLDER;
 const regularFile = process.env.ALLOWEDFILE;
 const blockedFolder = process.env.BLOCKEDFOLDER;
 const blockedFile = process.env.BLOCKEDFILE;
+const bufferBlockedFile = Buffer.from(process.env.BLOCKEDFILE);
 const blockedFileURL = require('url').pathToFileURL(process.env.BLOCKEDFILE);
 const relativeProtectedFile = process.env.RELATIVEBLOCKEDFILE;
 const relativeProtectedFolder = process.env.RELATIVEBLOCKEDFOLDER;
@@ -34,6 +35,11 @@ const relativeProtectedFolder = process.env.RELATIVEBLOCKEDFOLDER;
     permission: 'FileSystemWrite',
     resource: path.toNamespacedPath(blockedFile),
   }));
+  fs.writeFile(bufferBlockedFile, 'example', common.expectsError({
+    code: 'ERR_ACCESS_DENIED',
+    permission: 'FileSystemWrite',
+    resource: path.toNamespacedPath(blockedFile),
+  }));
   assert.throws(() => {
     fs.writeFileSync(blockedFileURL, 'example');
   }, {
@@ -102,6 +108,13 @@ const relativeProtectedFolder = process.env.RELATIVEBLOCKEDFOLDER;
     permission: 'FileSystemWrite',
     resource: path.toNamespacedPath(blockedFile),
   });
+  assert.throws(() => {
+    fs.utimes(bufferBlockedFile, new Date(), new Date(), () => {});
+  }, {
+    code: 'ERR_ACCESS_DENIED',
+    permission: 'FileSystemWrite',
+    resource: path.toNamespacedPath(blockedFile),
+  });
   assert.throws(() => {
     fs.utimes(blockedFileURL, new Date(), new Date(), () => {});
   }, {
@@ -135,6 +148,13 @@ const relativeProtectedFolder = process.env.RELATIVEBLOCKEDFOLDER;
     permission: 'FileSystemWrite',
     resource: path.toNamespacedPath(blockedFile),
   });
+  assert.throws(() => {
+    fs.lutimes(bufferBlockedFile, new Date(), new Date(), () => {});
+  },{
+    code: 'ERR_ACCESS_DENIED',
+    permission: 'FileSystemWrite',
+    resource: path.toNamespacedPath(blockedFile),
+  });
   assert.throws(() => {
     fs.lutimes(blockedFileURL, new Date(), new Date(), () => {});
   }, {
@@ -193,6 +213,11 @@ const relativeProtectedFolder = process.env.RELATIVEBLOCKEDFOLDER;
     permission: 'FileSystemWrite',
     resource: path.toNamespacedPath(blockedFile),
   }));
+  fs.rename(bufferBlockedFile, path.join(blockedFile, 'renamed'), common.expectsError({
+    code: 'ERR_ACCESS_DENIED',
+    permission: 'FileSystemWrite',
+    resource: path.toNamespacedPath(blockedFile),
+  }));
   assert.throws(() => {
     fs.renameSync(blockedFileURL, path.join(blockedFile, 'renamed'));
   }, {
@@ -245,6 +270,11 @@ const relativeProtectedFolder = process.env.RELATIVEBLOCKEDFOLDER;
     permission: 'FileSystemWrite',
     resource: path.toNamespacedPath(path.join(relativeProtectedFolder, 'any-file')),
   }));
+  fs.copyFile(bufferBlockedFile, path.join(relativeProtectedFolder, 'any-file'), common.expectsError({
+    code: 'ERR_ACCESS_DENIED',
+    permission: 'FileSystemWrite',
+    resource: path.toNamespacedPath(path.join(relativeProtectedFolder, 'any-file')),
+  }));
 }
 
 // fs.cp
@@ -295,6 +325,10 @@ const relativeProtectedFolder = process.env.RELATIVEBLOCKEDFOLDER;
     code: 'ERR_ACCESS_DENIED',
     permission: 'FileSystemWrite',
   }));
+  fs.open(bufferBlockedFile, fs.constants.O_RDWR | 0x10000000, common.expectsError({
+    code: 'ERR_ACCESS_DENIED',
+    permission: 'FileSystemWrite',
+  }));
   assert.rejects(async () => {
     await fs.promises.open(blockedFile, fs.constants.O_RDWR | fs.constants.O_NOFOLLOW);
   }, {
@@ -322,6 +356,12 @@ const relativeProtectedFolder = process.env.RELATIVEBLOCKEDFOLDER;
     code: 'ERR_ACCESS_DENIED',
     permission: 'FileSystemWrite',
   });
+  assert.throws(() => {
+    fs.chmod(bufferBlockedFile, 0o755, common.mustNotCall());
+  }, {
+    code: 'ERR_ACCESS_DENIED',
+    permission: 'FileSystemWrite',
+  });
   assert.throws(() => {
     fs.chmod(blockedFileURL, 0o755, common.mustNotCall());
   }, {
@@ -358,6 +398,10 @@ const relativeProtectedFolder = process.env.RELATIVEBLOCKEDFOLDER;
     code: 'ERR_ACCESS_DENIED',
     permission: 'FileSystemWrite',
   }));
+  fs.appendFile(bufferBlockedFile, 'new data', common.expectsError({
+    code: 'ERR_ACCESS_DENIED',
+    permission: 'FileSystemWrite',
+  }));
   assert.throws(() => {
     fs.appendFileSync(blockedFileURL, 'new data');
   }, {
@@ -378,6 +422,10 @@ const relativeProtectedFolder = process.env.RELATIVEBLOCKEDFOLDER;
     code: 'ERR_ACCESS_DENIED',
     permission: 'FileSystemWrite',
   }));
+  fs.chown(bufferBlockedFile, 1541, 999, common.expectsError({
+    code: 'ERR_ACCESS_DENIED',
+    permission: 'FileSystemWrite',
+  }));
   assert.throws(() => {
     fs.chownSync(blockedFileURL, 1541, 999);
   }, {
@@ -399,6 +447,10 @@ const relativeProtectedFolder = process.env.RELATIVEBLOCKEDFOLDER;
     code: 'ERR_ACCESS_DENIED',
     permission: 'FileSystemWrite',
   }));
+  fs.lchown(bufferBlockedFile, 1541, 999, common.expectsError({
+    code: 'ERR_ACCESS_DENIED',
+    permission: 'FileSystemWrite',
+  }));
   assert.throws(() => {
     fs.lchownSync(blockedFileURL, 1541, 999);
   }, {
@@ -426,6 +478,10 @@ const relativeProtectedFolder = process.env.RELATIVEBLOCKEDFOLDER;
     code: 'ERR_ACCESS_DENIED',
     permission: 'FileSystemWrite',
   }));
+  fs.link(bufferBlockedFile, path.join(blockedFolder, '/linked'), common.expectsError({
+    code: 'ERR_ACCESS_DENIED',
+    permission: 'FileSystemWrite',
+  }));
   assert.throws(() => {
     fs.linkSync(blockedFileURL, path.join(blockedFolder, '/linked'));
   }, {
@@ -450,6 +506,13 @@ const relativeProtectedFolder = process.env.RELATIVEBLOCKEDFOLDER;
     permission: 'FileSystemWrite',
     resource: path.toNamespacedPath(blockedFile),
   });
+  assert.throws(() => {
+    fs.unlinkSync(bufferBlockedFile);
+  }, {
+    code: 'ERR_ACCESS_DENIED',
+    permission: 'FileSystemWrite',
+    resource: path.toNamespacedPath(blockedFile),
+  });
   fs.unlink(blockedFile, common.expectsError({
     code: 'ERR_ACCESS_DENIED',
     permission: 'FileSystemWrite',