af_alg06.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright 2019 Google LLC
 */

/*
 * Regression test for commit 8f9c46934848 ("crypto: authenc - fix parsing key
 * with misaligned rta_len").  Based on the reproducer from the commit message.
 */

#include <errno.h>

#include "tst_test.h"
#include "tst_af_alg.h"
#include "lapi/socket.h"

/*
 * include after <sys/socket.h> (via tst_test.h), to work around dependency bug
 * in old kernel headers (https://www.spinics.net/lists/netdev/msg171764.html)
 */
#include <linux/rtnetlink.h>

static void run(void)
{
	struct {
		struct rtattr attr;
		uint32_t enckeylen;
		char keys[1];
	} __attribute__((packed)) key = {
		.attr.rta_len = sizeof(key),
		.attr.rta_type = 1 /* CRYPTO_AUTHENC_KEYA_PARAM */,
	};
	int algfd;

	algfd = tst_alg_setup("aead", "authenc(hmac(sha256),cbc(aes))",
			      NULL, 0);
	tst_res(TINFO,
		"Setting malformed authenc key. May crash buggy kernels.");
	TEST(setsockopt(algfd, SOL_ALG, ALG_SET_KEY, &key, sizeof(key)));
	if (TST_RET == 0)
		tst_res(TFAIL, "setting malformed key unexpectedly succeeded");
	else if (TST_ERR != EINVAL)
		tst_res(TFAIL | TTERRNO,
			"setting malformed key failed with unexpected error");
	else
		tst_res(TPASS, "didn't crash, and got EINVAL as expected");
}

static struct tst_test test = {
	.test_all = run,
	.tags = (const struct tst_tag[]) {
		{"linux-git", "8f9c46934848"},
		{}
	}
};