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Add test for O_TRUNC

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b/36576592 calls out an edge case previously not supported
by HostFS. HostFS is currently being removed, meaning gVisor
supports this feature. Simply add the test to open_test.

PiperOrigin-RevId: 314610226
This commit is contained in:
Zach Koopmans
2020-06-03 14:56:04 -07:00
committed by gVisor bot
parent 7da69fe971
commit d8d86f0f3a
1 changed files with 23 additions and 0 deletions
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test/syscalls/linux/open.cc
+23
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@@ -416,6 +416,29 @@ TEST_F(OpenTest, CanTruncateWriteOnlyNoReadPermission_NoRandomSave) {
EXPECT_EQ(stat.st_size, 0);
}
TEST_F(OpenTest, CanTruncateWithStrangePermissions) {
ASSERT_NO_ERRNO(SetCapability(CAP_DAC_OVERRIDE, false));
ASSERT_NO_ERRNO(SetCapability(CAP_DAC_READ_SEARCH, false));
const DisableSave ds; // Permissions are dropped.
std::string path = NewTempAbsPath();
int fd;
// Create a file without user permissions.
EXPECT_THAT( // SAVE_BELOW
fd = open(path.c_str(), O_CREAT | O_TRUNC | O_WRONLY, 055),
SyscallSucceeds());
EXPECT_THAT(close(fd), SyscallSucceeds());
// Cannot open file because we are owner and have no permissions set.
EXPECT_THAT(open(path.c_str(), O_RDONLY), SyscallFailsWithErrno(EACCES));
// We *can* chmod the file, because we are the owner.
EXPECT_THAT(chmod(path.c_str(), 0755), SyscallSucceeds());
// Now we can open the file again.
EXPECT_THAT(fd = open(path.c_str(), O_RDWR), SyscallSucceeds());
EXPECT_THAT(close(fd), SyscallSucceeds());
}
} // namespace
} // namespace testing