2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2019 Kyle Evans <kevans@FreeBSD.org>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
32 #include <sys/fcntl.h>
39 ATF_TC_WITHOUT_HEAD(basic);
40 ATF_TC_BODY(basic, tc)
45 ATF_REQUIRE((fd = memfd_create("...", 0)) != -1);
47 /* File size should be initially 0 */
48 ATF_REQUIRE(write(fd, buf, sizeof(buf)) == 0);
50 /* ftruncate(2) must succeed without seals */
51 ATF_REQUIRE(ftruncate(fd, sizeof(buf) - 1) == 0);
53 ATF_REQUIRE(write(fd, buf, sizeof(buf)) == sizeof(buf) - 1);
58 ATF_TC_WITHOUT_HEAD(cloexec);
59 ATF_TC_BODY(cloexec, tc)
63 ATF_REQUIRE((fd_nocl = memfd_create("...", 0)) != -1);
64 ATF_REQUIRE((fd_cl = memfd_create("...", MFD_CLOEXEC)) != -1);
66 ATF_REQUIRE((fcntl(fd_nocl, F_GETFD) & FD_CLOEXEC) == 0);
67 ATF_REQUIRE((fcntl(fd_cl, F_GETFD) & FD_CLOEXEC) != 0);
73 ATF_TC_WITHOUT_HEAD(disallowed_sealing);
74 ATF_TC_BODY(disallowed_sealing, tc)
78 ATF_REQUIRE((fd = memfd_create("...", 0)) != -1);
79 ATF_REQUIRE(fcntl(fd, F_GET_SEALS) == F_SEAL_SEAL);
80 ATF_REQUIRE(fcntl(fd, F_ADD_SEALS, F_SEAL_WRITE) == -1);
81 ATF_REQUIRE(errno == EPERM);
88 ATF_TC_WITHOUT_HEAD(write_seal);
89 ATF_TC_BODY(write_seal, tc)
92 char *addr, buf[BUF_SIZE];
94 ATF_REQUIRE((fd = memfd_create("...", MFD_ALLOW_SEALING)) != -1);
95 ATF_REQUIRE(ftruncate(fd, BUF_SIZE) == 0);
97 /* Write once, then we'll seal it and try again */
98 ATF_REQUIRE(write(fd, buf, BUF_SIZE) == BUF_SIZE);
99 ATF_REQUIRE(lseek(fd, 0, SEEK_SET) == 0);
101 addr = mmap(0, BUF_SIZE, (PROT_READ | PROT_WRITE), MAP_PRIVATE, fd, 0);
102 ATF_REQUIRE(addr != MAP_FAILED);
103 ATF_REQUIRE(munmap(addr, BUF_SIZE) == 0);
105 ATF_REQUIRE(fcntl(fd, F_ADD_SEALS, F_SEAL_WRITE) == 0);
107 ATF_REQUIRE(write(fd, buf, BUF_SIZE) == -1);
108 ATF_REQUIRE(errno == EPERM);
110 ATF_REQUIRE(mmap(0, BUF_SIZE, (PROT_READ | PROT_WRITE), MAP_SHARED,
111 fd, 0) == MAP_FAILED);
112 ATF_REQUIRE(errno == EPERM);
117 ATF_TC_WITHOUT_HEAD(mmap_write_seal);
118 ATF_TC_BODY(mmap_write_seal, tc)
121 char *addr, *paddr, *raddr;
123 ATF_REQUIRE((fd = memfd_create("...", MFD_ALLOW_SEALING)) != -1);
124 ATF_REQUIRE(ftruncate(fd, BUF_SIZE) == 0);
126 /* Map it, both shared and privately */
127 addr = mmap(0, BUF_SIZE, (PROT_READ | PROT_WRITE), MAP_SHARED, fd, 0);
128 ATF_REQUIRE(addr != MAP_FAILED);
129 paddr = mmap(0, BUF_SIZE, (PROT_READ | PROT_WRITE), MAP_PRIVATE, fd, 0);
130 ATF_REQUIRE(paddr != MAP_FAILED);
131 raddr = mmap(0, BUF_SIZE, PROT_READ, MAP_SHARED, fd, 0);
132 ATF_REQUIRE(raddr != MAP_FAILED);
134 /* Now try to seal it before unmapping */
135 ATF_REQUIRE(fcntl(fd, F_ADD_SEALS, F_SEAL_WRITE) == -1);
136 ATF_REQUIRE(errno == EBUSY);
138 ATF_REQUIRE(munmap(addr, BUF_SIZE) == 0);
140 ATF_REQUIRE(fcntl(fd, F_ADD_SEALS, F_SEAL_WRITE) == 0);
142 ATF_REQUIRE(munmap(paddr, BUF_SIZE) == 0);
143 ATF_REQUIRE(munmap(raddr, BUF_SIZE) == 0);
144 ATF_REQUIRE(mmap(0, BUF_SIZE, (PROT_READ | PROT_WRITE), MAP_SHARED,
145 fd, 0) == MAP_FAILED);
146 ATF_REQUIRE(errno == EPERM);
147 paddr = mmap(0, BUF_SIZE, (PROT_READ | PROT_WRITE), MAP_PRIVATE, fd, 0);
148 ATF_REQUIRE(paddr != MAP_FAILED);
149 raddr = mmap(0, BUF_SIZE, PROT_READ, MAP_SHARED, fd, 0);
150 ATF_REQUIRE(raddr != MAP_FAILED);
151 ATF_REQUIRE(munmap(raddr, BUF_SIZE) == 0);
152 ATF_REQUIRE(munmap(paddr, BUF_SIZE) == 0);
158 memfd_truncate_test(int initial_size, int dest_size, int seals)
162 ATF_REQUIRE((fd = memfd_create("...", MFD_ALLOW_SEALING)) != -1);
163 ATF_REQUIRE(ftruncate(fd, initial_size) == 0);
165 ATF_REQUIRE(fcntl(fd, F_ADD_SEALS, seals) == 0);
167 err = ftruncate(fd, dest_size);
174 ATF_TC_WITHOUT_HEAD(truncate_seals);
175 ATF_TC_BODY(truncate_seals, tc)
178 ATF_REQUIRE(memfd_truncate_test(4, 8, F_SEAL_GROW) == EPERM);
179 ATF_REQUIRE(memfd_truncate_test(8, 4, F_SEAL_SHRINK) == EPERM);
180 ATF_REQUIRE(memfd_truncate_test(8, 4, F_SEAL_GROW) == 0);
181 ATF_REQUIRE(memfd_truncate_test(4, 8, F_SEAL_SHRINK) == 0);
183 ATF_REQUIRE(memfd_truncate_test(4, 8, F_SEAL_GROW | F_SEAL_SHRINK) ==
185 ATF_REQUIRE(memfd_truncate_test(8, 4, F_SEAL_GROW | F_SEAL_SHRINK) ==
187 ATF_REQUIRE(memfd_truncate_test(4, 4, F_SEAL_GROW | F_SEAL_SHRINK) ==
191 ATF_TC_WITHOUT_HEAD(get_seals);
192 ATF_TC_BODY(get_seals, tc)
197 ATF_REQUIRE((fd = memfd_create("...", MFD_ALLOW_SEALING)) != -1);
198 ATF_REQUIRE(fcntl(fd, F_GET_SEALS) == 0);
200 ATF_REQUIRE(fcntl(fd, F_ADD_SEALS, F_SEAL_WRITE | F_SEAL_GROW) == 0);
201 seals = fcntl(fd, F_GET_SEALS);
202 ATF_REQUIRE(seals == (F_SEAL_WRITE | F_SEAL_GROW));
207 ATF_TC_WITHOUT_HEAD(dup_seals);
208 ATF_TC_BODY(dup_seals, tc)
214 ATF_REQUIRE((fd = memfd_create("...", MFD_ALLOW_SEALING)) != -1);
215 ATF_REQUIRE((fdx = dup(fd)) != -1);
216 ATF_REQUIRE(fcntl(fd, F_GET_SEALS) == 0);
218 ATF_REQUIRE(fcntl(fd, F_ADD_SEALS, F_SEAL_WRITE | F_SEAL_GROW) == 0);
219 seals = fcntl(fd, F_GET_SEALS);
220 ATF_REQUIRE(seals == (F_SEAL_WRITE | F_SEAL_GROW));
222 seals = fcntl(fdx, F_GET_SEALS);
223 ATF_REQUIRE(seals == (F_SEAL_WRITE | F_SEAL_GROW));
225 /* Make sure the seal's actually being applied at the inode level */
226 ATF_REQUIRE(write(fdx, buf, sizeof(buf)) == -1);
227 ATF_REQUIRE(errno == EPERM);
229 ATF_REQUIRE(mmap(0, BUF_SIZE, (PROT_READ | PROT_WRITE), MAP_SHARED,
230 fdx, 0) == MAP_FAILED);
231 ATF_REQUIRE(errno == EPERM);
237 ATF_TC_WITHOUT_HEAD(immutable_seals);
238 ATF_TC_BODY(immutable_seals, tc)
242 ATF_REQUIRE((fd = memfd_create("...", MFD_ALLOW_SEALING)) != -1);
244 ATF_REQUIRE(fcntl(fd, F_ADD_SEALS, F_SEAL_SEAL) == 0);
245 ATF_REQUIRE(fcntl(fd, F_ADD_SEALS, F_SEAL_GROW) == -1);
246 ATF_REQUIRE_MSG(errno == EPERM,
247 "Added unique grow seal after restricting seals");
252 * Also check that adding a seal that already exists really doesn't
253 * do anything once we're sealed.
255 ATF_REQUIRE((fd = memfd_create("...", MFD_ALLOW_SEALING)) != -1);
257 ATF_REQUIRE(fcntl(fd, F_ADD_SEALS, F_SEAL_GROW | F_SEAL_SEAL) == 0);
258 ATF_REQUIRE(fcntl(fd, F_ADD_SEALS, F_SEAL_GROW) == -1);
259 ATF_REQUIRE_MSG(errno == EPERM,
260 "Added duplicate grow seal after restricting seals");
268 ATF_TP_ADD_TC(tp, basic);
269 ATF_TP_ADD_TC(tp, cloexec);
270 ATF_TP_ADD_TC(tp, disallowed_sealing);
271 ATF_TP_ADD_TC(tp, write_seal);
272 ATF_TP_ADD_TC(tp, mmap_write_seal);
273 ATF_TP_ADD_TC(tp, truncate_seals);
274 ATF_TP_ADD_TC(tp, get_seals);
275 ATF_TP_ADD_TC(tp, dup_seals);
276 ATF_TP_ADD_TC(tp, immutable_seals);
277 return (atf_no_error());