1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright 2019 Google LLC
4 */
5
6 /*
7 * Regression test for commit 8088d3dd4d7c ("crypto: skcipher - fix crash
8 * flushing dcache in error path"). This test verifies the kernel doesn't crash
9 * when trying to encrypt a message with size not aligned to the block cipher's
10 * block size, and where the destination buffer starts exactly at a page
11 * boundary. Based on the reproducer from the commit message. Note that this
12 * issue only reproduces on certain architectures, such as arm and arm64.
13 *
14 * On some older kernel without commit 160544075f2a ("crypto: scatterwalk - Hide
15 * PageSlab call to optimise away flush_dcache_page") , it doesn't use
16 * ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE macro. It can crash on all architectures.
17 * Without skcipher walk interface, it is also a regresstion test for commit
18 * 0868def3e410("crypto: blkcipher - fix crash flushing dcache in error path").
19 */
20
21 #include <errno.h>
22
23 #include "tst_test.h"
24 #include "tst_af_alg.h"
25
run(void)26 static void run(void)
27 {
28 char buffer[4096] __attribute__((aligned(4096))) = { 0 };
29 int reqfd;
30
31 reqfd = tst_alg_setup_reqfd("skcipher", "cbc(aes-generic)", NULL, 16);
32
33 SAFE_WRITE(SAFE_WRITE_ALL, reqfd, buffer, 15);
34 /* with the bug, this crashed the kernel on some architectures */
35 TEST(read(reqfd, buffer, 15));
36
37 if (TST_RET == 0)
38 tst_res(TFAIL, "read() unexpectedly succeeded");
39 else if (TST_ERR == EINVAL)
40 tst_res(TPASS, "read() expectedly failed with EINVAL");
41 else
42 tst_res(TFAIL | TTERRNO, "read() failed with unexpected error");
43
44 close(reqfd);
45 }
46
47 static struct tst_test test = {
48 .test_all = run,
49 .tags = (const struct tst_tag[]) {
50 {"linux-git", "8088d3dd4d7c"},
51 {"linux-git", "160544075f2a"},
52 {"linux-git", "0868def3e410"},
53 {}
54 }
55 };
56