1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright 2019 Google LLC
4 * Copyright (c) Linux Test Project, 2019-2021
5 */
6
7 /*
8 * Regression test for commit bb2964810233 ("crypto: vmac - separate tfm and
9 * request context"). This test verifies that a VMAC transform can be used by
10 * multiple concurrent hash requests without crashing the kernel. Based on the
11 * reproducer from the commit message.
12 */
13
14 #include <stdio.h>
15 #include <sys/wait.h>
16
17 #include "tst_test.h"
18 #include "tst_af_alg.h"
19
test_with_symm_enc_algs(const char * symm_enc_algname)20 static void test_with_symm_enc_algs(const char *symm_enc_algname)
21 {
22 int algfd, reqfd;
23 char buf[256] = { 0 };
24 char vmac_algname[64];
25 pid_t pid;
26 int status;
27 int i;
28
29 sprintf(vmac_algname, "vmac64(%s)", symm_enc_algname);
30 if (!tst_have_alg("hash", vmac_algname)) {
31 sprintf(vmac_algname, "vmac(%s)", symm_enc_algname);
32 if (!tst_have_alg("hash", vmac_algname))
33 return;
34 }
35 algfd = tst_alg_setup("hash", vmac_algname, NULL, 16);
36
37 tst_res(TINFO, "Starting vmac hashing test. May crash buggy kernels.");
38
39 pid = SAFE_FORK();
40
41 reqfd = tst_alg_accept(algfd);
42
43 for (i = 0; i < 500000; i++)
44 SAFE_WRITE(SAFE_WRITE_ALL, reqfd, buf, sizeof(buf));
45
46 close(reqfd);
47
48 if (pid != 0) {
49 SAFE_WAIT(&status);
50 if (WIFEXITED(status) && WEXITSTATUS(status) == 0)
51 tst_res(TPASS, "didn't crash");
52 else if (WIFSIGNALED(status) && WTERMSIG(status) == SIGKILL)
53 tst_res(TFAIL, "crashed");
54 else
55 tst_brk(TBROK, "child %s", tst_strstatus(status));
56
57 close(algfd);
58 }
59 }
60
61 /* try several different symmetric encryption algorithms */
62 static const char * const symm_enc_algs[] = {
63 "aes",
64 "sm4",
65 "sm4-generic",
66 };
67
do_test(unsigned int i)68 static void do_test(unsigned int i)
69 {
70 test_with_symm_enc_algs(symm_enc_algs[i]);
71 }
72
73 static struct tst_test test = {
74 .test = do_test,
75 .tcnt = ARRAY_SIZE(symm_enc_algs),
76 .forks_child = 1,
77 .tags = (const struct tst_tag[]) {
78 {"linux-git", "bb2964810233"},
79 {}
80 }
81 };
82