1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
|
// Copyright 2018 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <fcntl.h>
#include <grp.h>
#include <sys/prctl.h>
#include <sys/types.h>
#include <unistd.h>
#include <vector>
#include "gtest/gtest.h"
#include "test/util/capability_util.h"
#include "test/util/file_descriptor.h"
#include "test/util/fs_util.h"
#include "test/util/temp_path.h"
#include "test/util/test_util.h"
#include "test/util/thread_util.h"
DEFINE_int32(scratch_uid, 65534, "first scratch UID");
DEFINE_int32(scratch_gid, 65534, "first scratch GID");
namespace gvisor {
namespace testing {
namespace {
TEST(StickyTest, StickyBitPermDenied) {
SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_SETUID)));
auto dir = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir());
EXPECT_THAT(chmod(dir.path().c_str(), 0777 | S_ISVTX), SyscallSucceeds());
std::string path = JoinPath(dir.path(), "NewDir");
ASSERT_THAT(mkdir(path.c_str(), 0755), SyscallSucceeds());
// Drop privileges and change IDs only in child thread, or else this parent
// thread won't be able to open some log files after the test ends.
ScopedThread([&] {
// Drop privileges.
if (HaveCapability(CAP_FOWNER).ValueOrDie()) {
EXPECT_NO_ERRNO(SetCapability(CAP_FOWNER, false));
}
// Change EUID and EGID.
EXPECT_THAT(syscall(SYS_setresgid, -1, FLAGS_scratch_gid, -1),
SyscallSucceeds());
EXPECT_THAT(syscall(SYS_setresuid, -1, FLAGS_scratch_uid, -1),
SyscallSucceeds());
EXPECT_THAT(rmdir(path.c_str()), SyscallFailsWithErrno(EPERM));
});
}
TEST(StickyTest, StickyBitSameUID) {
SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_SETUID)));
auto dir = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir());
EXPECT_THAT(chmod(dir.path().c_str(), 0777 | S_ISVTX), SyscallSucceeds());
std::string path = JoinPath(dir.path(), "NewDir");
ASSERT_THAT(mkdir(path.c_str(), 0755), SyscallSucceeds());
// Drop privileges and change IDs only in child thread, or else this parent
// thread won't be able to open some log files after the test ends.
ScopedThread([&] {
// Drop privileges.
if (HaveCapability(CAP_FOWNER).ValueOrDie()) {
EXPECT_NO_ERRNO(SetCapability(CAP_FOWNER, false));
}
// Change EGID.
EXPECT_THAT(syscall(SYS_setresgid, -1, FLAGS_scratch_gid, -1),
SyscallSucceeds());
// We still have the same EUID.
EXPECT_THAT(rmdir(path.c_str()), SyscallSucceeds());
});
}
TEST(StickyTest, StickyBitCapFOWNER) {
SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_SETUID)));
auto dir = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir());
EXPECT_THAT(chmod(dir.path().c_str(), 0777 | S_ISVTX), SyscallSucceeds());
std::string path = JoinPath(dir.path(), "NewDir");
ASSERT_THAT(mkdir(path.c_str(), 0755), SyscallSucceeds());
// Drop privileges and change IDs only in child thread, or else this parent
// thread won't be able to open some log files after the test ends.
ScopedThread([&] {
// Set PR_SET_KEEPCAPS.
EXPECT_THAT(prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0), SyscallSucceeds());
// Change EUID and EGID.
EXPECT_THAT(syscall(SYS_setresgid, -1, FLAGS_scratch_gid, -1),
SyscallSucceeds());
EXPECT_THAT(syscall(SYS_setresuid, -1, FLAGS_scratch_uid, -1),
SyscallSucceeds());
EXPECT_NO_ERRNO(SetCapability(CAP_FOWNER, true));
EXPECT_THAT(rmdir(path.c_str()), SyscallSucceeds());
});
}
} // namespace
} // namespace testing
} // namespace gvisor
|
