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c91cfb7f9e
The four functions more or less perform the same operation. Reuse the same unit test with slight changes so we can cover them all. Constant-time operation is not verified for the timingsafe_* functions. Sponsored by: The FreeBSD Foundation Approved by: ngie MFC after: 1 week Differential Revision: https://reviews.freebsd.org/D41528 (cherry picked from commit c6cc06d465a98270ef734ffec7c9012ec3a1bd17)
160 lines
4.8 KiB
C
160 lines
4.8 KiB
C
/*-
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* Copyright (c) 2016 Jilles Tjoelker <jilles@FreeBSD.org>
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* Copyright (c) 2023 The FreeBSD Foundation
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* All rights reserved.
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*
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* Portions of this software were developed by Robert Clausecker
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* <fuz@FreeBSD.org> under sponsorship from the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <assert.h>
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#include <dlfcn.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <atf-c.h>
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#ifndef MEMCMP
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#define MEMCMP memcmp
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#endif
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/*
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* On FreeBSD we demand that memcmp returns the difference between the
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* characters at the first site of mismatch. However, ISO/IEC 9899:1990
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* only specifies that a number greater than, equal to, or less than
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* zero shall be returned. If a unit test for this less strict
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* behaviour is desired, define RES(x) to be (((x) > 0) - ((x) < 0)).
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*/
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#ifndef RES
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#define RES(x) (x)
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#endif
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static int (*memcmp_fn)(const void *, const void *, size_t);
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static void
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check_memcmp(const char *a, const char *b, size_t len, int expected)
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{
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int got;
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got = memcmp_fn(a, b, len);
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ATF_CHECK_EQ_MSG(RES(expected), RES(got),
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"%s(%p, %p, %zu) gave %d, but wanted %d",
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__XSTRING(MEMCMP), a, b, len, got, expected);
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}
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ATF_TC_WITHOUT_HEAD(zero);
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ATF_TC_BODY(zero, tc)
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{
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check_memcmp("a", "b", 0, 0);
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check_memcmp("", "", 0, 0);
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}
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ATF_TC_WITHOUT_HEAD(eq);
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ATF_TC_BODY(eq, tc)
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{
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unsigned char data1[256], data2[256];
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int i;
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for (i = 0; i < 256; i++)
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data1[i] = data2[i] = i ^ 0x55;
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for (i = 1; i < 256; i++)
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check_memcmp(data1, data2, i, 0);
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for (i = 1; i < 256; i++)
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check_memcmp(data1 + i, data2 + i, 256 - i, 0);
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}
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ATF_TC_WITHOUT_HEAD(neq);
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ATF_TC_BODY(neq, tc)
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{
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unsigned char data1[256], data2[256];
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int i;
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for (i = 0; i < 256; i++) {
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data1[i] = i;
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data2[i] = i ^ 0x55;
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}
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for (i = 1; i < 256; i++)
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check_memcmp(data1, data2, i, -0x55);
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for (i = 1; i < 256; i++)
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check_memcmp(data1 + i, data2 + i, 256 - i, i - (i ^ 0x55));
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}
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ATF_TC_WITHOUT_HEAD(diff);
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ATF_TC_BODY(diff, tc)
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{
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unsigned char data1[256], data2[256];
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int i;
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memset(data1, 'a', sizeof(data1));
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memset(data2, 'a', sizeof(data2));
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data1[128] = 255;
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data2[128] = 0;
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for (i = 1; i < 66; i++) {
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check_memcmp(data1 + 128, data2 + 128, i, 255);
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check_memcmp(data2 + 128, data1 + 128, i, -255);
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check_memcmp(data1 + 129 - i, data2 + 129 - i, i, 255);
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check_memcmp(data2 + 129 - i, data1 + 129 - i, i, -255);
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check_memcmp(data1 + 129 - i, data2 + 129 - i, i * 2, 255);
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check_memcmp(data2 + 129 - i, data1 + 129 - i, i * 2, -255);
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}
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data1[128] = 'c';
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data2[128] = 'e';
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for (i = 1; i < 66; i++) {
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check_memcmp(data1 + 128, data2 + 128, i, -2);
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check_memcmp(data2 + 128, data1 + 128, i, 2);
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check_memcmp(data1 + 129 - i, data2 + 129 - i, i, -2);
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check_memcmp(data2 + 129 - i, data1 + 129 - i, i, 2);
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check_memcmp(data1 + 129 - i, data2 + 129 - i, i * 2, -2);
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check_memcmp(data2 + 129 - i, data1 + 129 - i, i * 2, 2);
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}
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memset(data1 + 129, 'A', sizeof(data1) - 129);
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memset(data2 + 129, 'Z', sizeof(data2) - 129);
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for (i = 1; i < 66; i++) {
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check_memcmp(data1 + 128, data2 + 128, i, -2);
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check_memcmp(data2 + 128, data1 + 128, i, 2);
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check_memcmp(data1 + 129 - i, data2 + 129 - i, i, -2);
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check_memcmp(data2 + 129 - i, data1 + 129 - i, i, 2);
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check_memcmp(data1 + 129 - i, data2 + 129 - i, i * 2, -2);
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check_memcmp(data2 + 129 - i, data1 + 129 - i, i * 2, 2);
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}
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}
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ATF_TP_ADD_TCS(tp)
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{
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void *dl_handle;
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dl_handle = dlopen(NULL, RTLD_LAZY);
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memcmp_fn = dlsym(dl_handle, "test_" __XSTRING(MEMCMP));
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if (memcmp_fn == NULL)
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memcmp_fn = MEMCMP;
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ATF_TP_ADD_TC(tp, zero);
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ATF_TP_ADD_TC(tp, eq);
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ATF_TP_ADD_TC(tp, neq);
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ATF_TP_ADD_TC(tp, diff);
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return (atf_no_error());
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}
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