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x86: Test wcscmp RTM in the wcsncmp overflow case [BZ #28896]

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In the overflow fallback strncmp-avx2-rtm and wcsncmp-avx2-rtm would
call strcmp-avx2 and wcscmp-avx2 respectively. This would have
not checks around vzeroupper and would trigger spurious
aborts. This commit fixes that.

test-strcmp, test-strncmp, test-wcscmp, and test-wcsncmp all pass on
AVX2 machines with and without RTM.
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
This commit is contained in:
Noah Goldstein 2022-02-18 14:19:15 -06:00
parent 71b108d7eb
commit 7835d611af
3 changed files with 48 additions and 10 deletions
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5
sysdeps/x86/Makefile
View File

@ -99,7 +99,9 @@ tests += \
tst-strcpy-rtm \
tst-strlen-rtm \
tst-strncmp-rtm \
tst-strrchr-rtm
tst-strrchr-rtm \
tst-wcsncmp-rtm \
# tests
CFLAGS-tst-memchr-rtm.c += -mrtm
CFLAGS-tst-memcmp-rtm.c += -mrtm
@ -111,6 +113,7 @@ CFLAGS-tst-strcpy-rtm.c += -mrtm
CFLAGS-tst-strlen-rtm.c += -mrtm
CFLAGS-tst-strncmp-rtm.c += -mrtm -Wno-error
CFLAGS-tst-strrchr-rtm.c += -mrtm
CFLAGS-tst-wcsncmp-rtm.c += -mrtm -Wno-error
endif
ifneq ($(enable-cet),no)

32
sysdeps/x86/tst-strncmp-rtm.c
View File

@ -19,18 +19,32 @@
#include <stdint.h>
#include <tst-string-rtm.h>
#ifdef WIDE
# define CHAR wchar_t
# define MEMSET wmemset
# define STRNCMP wcsncmp
# define TEST_NAME wcsncmp
#else /* !WIDE */
# define CHAR char
# define MEMSET memset
# define STRNCMP strncmp
# define TEST_NAME strncmp
#endif /* !WIDE */
#define LOOP 3000
#define STRING_SIZE 1024
char string1[STRING_SIZE];
char string2[STRING_SIZE];
CHAR string1[STRING_SIZE];
CHAR string2[STRING_SIZE];
__attribute__ ((noinline, noclone))
static int
prepare (void)
{
memset (string1, 'a', STRING_SIZE - 1);
memset (string2, 'a', STRING_SIZE - 1);
if (strncmp (string1, string2, STRING_SIZE) == 0)
MEMSET (string1, 'a', STRING_SIZE - 1);
MEMSET (string2, 'a', STRING_SIZE - 1);
if (STRNCMP (string1, string2, STRING_SIZE) == 0)
return EXIT_SUCCESS;
else
return EXIT_FAILURE;
@ -40,7 +54,7 @@ __attribute__ ((noinline, noclone))
static int
function (void)
{
if (strncmp (string1, string2, STRING_SIZE) == 0)
if (STRNCMP (string1, string2, STRING_SIZE) == 0)
return 0;
else
return 1;
@ -50,7 +64,7 @@ __attribute__ ((noinline, noclone))
static int
function_overflow (void)
{
if (strncmp (string1, string2, SIZE_MAX) == 0)
if (STRNCMP (string1, string2, SIZE_MAX) == 0)
return 0;
else
return 1;
@ -59,9 +73,9 @@ function_overflow (void)
static int
do_test (void)
{
int status = do_test_1 ("strncmp", LOOP, prepare, function);
int status = do_test_1 (TEST_NAME, LOOP, prepare, function);
if (status != EXIT_SUCCESS)
return status;
status = do_test_1 ("strncmp", LOOP, prepare, function_overflow);
status = do_test_1 (TEST_NAME, LOOP, prepare, function_overflow);
return status;
}

21
sysdeps/x86/tst-wcsncmp-rtm.c Normal file
View File

@ -0,0 +1,21 @@
/* Test case for wcsncmp inside a transactionally executing RTM region.
Copyright (C) 2022 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#define WIDE 1
#include <wchar.h>
#include "tst-strncmp-rtm.c"