From 6ebb925acd6336760f6f9453e860944e0e314a7b Mon Sep 17 00:00:00 2001
From: Kevin Krakauer <krakauer@google.com>
Date: Fri, 12 Jul 2019 15:16:01 -0700
Subject: [PATCH] Add permission, char device, and uid checks.

Change-Id: I8307bfb390a56424aaa651285a218aad277c4aed
---
 test/syscalls/linux/dev.cc | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/test/syscalls/linux/dev.cc b/test/syscalls/linux/dev.cc
index 7b1dd14ef..7f0a2ec45 100644
--- a/test/syscalls/linux/dev.cc
+++ b/test/syscalls/linux/dev.cc
@@ -148,6 +148,10 @@ TEST(DevTest, WriteDevFull) {
 TEST(DevTest, TTYExists) {
   struct stat statbuf = {};
   ASSERT_THAT(stat("/dev/tty", &statbuf), SyscallSucceeds());
+  // Check that it's a character device with rw-rw-rw- permissions.
+  EXPECT_EQ(statbuf.st_mode, S_IFCHR | 0666);
+  // Check that it's owned by root.
+  EXPECT_EQ(statbuf.st_uid, 0);
 }
 
 }  // namespace