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136 lines
4.4 KiB
136 lines
4.4 KiB
From c6272098323153db373f2986c67786ea8c85f1cf Mon Sep 17 00:00:00 2001
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From: Noah Goldstein <goldstein.w.n@gmail.com>
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Date: Tue, 15 Feb 2022 08:18:15 -0600
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Subject: [PATCH] x86: Fallback {str|wcs}cmp RTM in the ncmp overflow case [BZ
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#28896]
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Content-type: text/plain; charset=UTF-8
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In the overflow fallback strncmp-avx2-rtm and wcsncmp-avx2-rtm would
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call strcmp-avx2 and wcscmp-avx2 respectively. This would have
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not checks around vzeroupper and would trigger spurious
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aborts. This commit fixes that.
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test-strcmp, test-strncmp, test-wcscmp, and test-wcsncmp all pass on
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AVX2 machines with and without RTM.
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Co-authored-by: H.J. Lu <hjl.tools@gmail.com>
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---
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sysdeps/x86/Makefile | 2 +-
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sysdeps/x86/tst-strncmp-rtm.c | 17 ++++++++++++++++-
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sysdeps/x86_64/multiarch/strcmp-avx2.S | 2 +-
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sysdeps/x86_64/multiarch/strncmp-avx2-rtm.S | 1 +
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sysdeps/x86_64/multiarch/strncmp-avx2.S | 1 +
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sysdeps/x86_64/multiarch/wcsncmp-avx2-rtm.S | 2 +-
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sysdeps/x86_64/multiarch/wcsncmp-avx2.S | 2 +-
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7 files changed, 22 insertions(+), 5 deletions(-)
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Conflicts:
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sysdeps/x86_64/multiarch/strcmp-avx2.S
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(split into two patches due to upstream bug differences)
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diff --git a/sysdeps/x86/Makefile b/sysdeps/x86/Makefile
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index 5be71ada..2d814915 100644
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--- a/sysdeps/x86/Makefile
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+++ b/sysdeps/x86/Makefile
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@@ -38,7 +38,7 @@ CFLAGS-tst-memset-rtm.c += -mrtm
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CFLAGS-tst-strchr-rtm.c += -mrtm
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CFLAGS-tst-strcpy-rtm.c += -mrtm
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CFLAGS-tst-strlen-rtm.c += -mrtm
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-CFLAGS-tst-strncmp-rtm.c += -mrtm
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+CFLAGS-tst-strncmp-rtm.c += -mrtm -Wno-error
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CFLAGS-tst-strrchr-rtm.c += -mrtm
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endif
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diff --git a/sysdeps/x86/tst-strncmp-rtm.c b/sysdeps/x86/tst-strncmp-rtm.c
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index 236ad951..4d0004b5 100644
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--- a/sysdeps/x86/tst-strncmp-rtm.c
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+++ b/sysdeps/x86/tst-strncmp-rtm.c
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@@ -16,6 +16,7 @@
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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+#include <stdint.h>
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#include <tst-string-rtm.h>
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#define LOOP 3000
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@@ -45,8 +46,22 @@ function (void)
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return 1;
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}
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+__attribute__ ((noinline, noclone))
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+static int
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+function_overflow (void)
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+{
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+ if (strncmp (string1, string2, SIZE_MAX) == 0)
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+ return 0;
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+ else
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+ return 1;
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+}
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+
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static int
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do_test (void)
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{
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- return do_test_1 ("strncmp", LOOP, prepare, function);
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+ int status = do_test_1 ("strncmp", LOOP, prepare, function);
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+ if (status != EXIT_SUCCESS)
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+ return status;
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+ status = do_test_1 ("strncmp", LOOP, prepare, function_overflow);
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+ return status;
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}
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diff --git a/sysdeps/x86_64/multiarch/strcmp-avx2.S b/sysdeps/x86_64/multiarch/strcmp-avx2.S
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index 5d1c9d90..433ae047 100644
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--- a/sysdeps/x86_64/multiarch/strcmp-avx2.S
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+++ b/sysdeps/x86_64/multiarch/strcmp-avx2.S
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@@ -95,7 +95,7 @@ ENTRY (STRCMP)
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length to bound a valid memory region. In these cases just use
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'wcscmp'. */
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shrq $56, %rcx
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- jnz __wcscmp_avx2
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+ jnz OVERFLOW_STRCMP
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# endif
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/* Convert units: from wide to byte char. */
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shl $2, %RDX_LP
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diff --git a/sysdeps/x86_64/multiarch/strncmp-avx2-rtm.S b/sysdeps/x86_64/multiarch/strncmp-avx2-rtm.S
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index 37d1224b..68bad365 100644
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--- a/sysdeps/x86_64/multiarch/strncmp-avx2-rtm.S
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+++ b/sysdeps/x86_64/multiarch/strncmp-avx2-rtm.S
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@@ -1,3 +1,4 @@
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#define STRCMP __strncmp_avx2_rtm
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#define USE_AS_STRNCMP 1
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+#define OVERFLOW_STRCMP __strcmp_avx2_rtm
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#include "strcmp-avx2-rtm.S"
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diff --git a/sysdeps/x86_64/multiarch/strncmp-avx2.S b/sysdeps/x86_64/multiarch/strncmp-avx2.S
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index 1678bcc2..f138e9f1 100644
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--- a/sysdeps/x86_64/multiarch/strncmp-avx2.S
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+++ b/sysdeps/x86_64/multiarch/strncmp-avx2.S
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@@ -1,3 +1,4 @@
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#define STRCMP __strncmp_avx2
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#define USE_AS_STRNCMP 1
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+#define OVERFLOW_STRCMP __strcmp_avx2
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#include "strcmp-avx2.S"
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diff --git a/sysdeps/x86_64/multiarch/wcsncmp-avx2-rtm.S b/sysdeps/x86_64/multiarch/wcsncmp-avx2-rtm.S
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index 4e88c70c..f467582c 100644
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--- a/sysdeps/x86_64/multiarch/wcsncmp-avx2-rtm.S
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+++ b/sysdeps/x86_64/multiarch/wcsncmp-avx2-rtm.S
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@@ -1,5 +1,5 @@
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#define STRCMP __wcsncmp_avx2_rtm
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#define USE_AS_STRNCMP 1
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#define USE_AS_WCSCMP 1
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-
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+#define OVERFLOW_STRCMP __wcscmp_avx2_rtm
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#include "strcmp-avx2-rtm.S"
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diff --git a/sysdeps/x86_64/multiarch/wcsncmp-avx2.S b/sysdeps/x86_64/multiarch/wcsncmp-avx2.S
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index 4fa1de4d..e9ede522 100644
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--- a/sysdeps/x86_64/multiarch/wcsncmp-avx2.S
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+++ b/sysdeps/x86_64/multiarch/wcsncmp-avx2.S
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@@ -1,5 +1,5 @@
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#define STRCMP __wcsncmp_avx2
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#define USE_AS_STRNCMP 1
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#define USE_AS_WCSCMP 1
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-
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+#define OVERFLOW_STRCMP __wcscmp_avx2
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#include "strcmp-avx2.S"
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--
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GitLab
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