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[76.191.17.161]) by smtp.googlemail.com with ESMTPSA id d9sm2851667ilc.30.2022.02.17.19.37.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 17 Feb 2022 19:37:43 -0800 (PST) From: Noah Goldstein To: libc-alpha@sourceware.org Subject: [PATCH v1] x86: Test wcscmp RTM in the wcsncmp overflow case [BZ #28896] Date: Thu, 17 Feb 2022 21:37:35 -0600 Message-Id: <20220218033735.1429857-1-goldstein.w.n@gmail.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=-12.6 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, FREEMAIL_FROM, GIT_PATCH_0, KAM_SHORT, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 18 Feb 2022 03:37:46 -0000 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. --- sysdeps/x86/Makefile | 4 +++- sysdeps/x86/tst-strncmp-rtm.c | 33 ++++++++++++++++++++++++--------- sysdeps/x86/tst-wcsncmp-rtm.c | 20 ++++++++++++++++++++ 3 files changed, 47 insertions(+), 10 deletions(-) create mode 100644 sysdeps/x86/tst-wcsncmp-rtm.c diff --git a/sysdeps/x86/Makefile b/sysdeps/x86/Makefile index d110f7b7f2..b13b556425 100644 --- a/sysdeps/x86/Makefile +++ b/sysdeps/x86/Makefile @@ -99,7 +99,8 @@ tests += \ tst-strcpy-rtm \ tst-strlen-rtm \ tst-strncmp-rtm \ - tst-strrchr-rtm + tst-strrchr-rtm \ + tst-wcsncmp-rtm CFLAGS-tst-memchr-rtm.c += -mrtm CFLAGS-tst-memcmp-rtm.c += -mrtm @@ -111,6 +112,7 @@ 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) diff --git a/sysdeps/x86/tst-strncmp-rtm.c b/sysdeps/x86/tst-strncmp-rtm.c index 9e20abaacc..5c6f40e5aa 100644 --- a/sysdeps/x86/tst-strncmp-rtm.c +++ b/sysdeps/x86/tst-strncmp-rtm.c @@ -17,20 +17,35 @@ . */ #include +#include #include +#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 +55,7 @@ __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 +65,7 @@ __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 +74,9 @@ 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; } diff --git a/sysdeps/x86/tst-wcsncmp-rtm.c b/sysdeps/x86/tst-wcsncmp-rtm.c new file mode 100644 index 0000000000..86f97e4035 --- /dev/null +++ b/sysdeps/x86/tst-wcsncmp-rtm.c @@ -0,0 +1,20 @@ +/* Test case for wcsncmp inside a transactionally executing RTM region. + Copyright (C) 2021-2022 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 + . */ + +#define WIDE 1 +#include "tst-strncmp-rtm.c" -- 2.25.1