136 lines
4.4 KiB
Diff
136 lines
4.4 KiB
Diff
From c6272098323153db373f2986c67786ea8c85f1cf Mon Sep 17 00:00:00 2001
|
|
From: Noah Goldstein <goldstein.w.n@gmail.com>
|
|
Date: Tue, 15 Feb 2022 08:18:15 -0600
|
|
Subject: [PATCH] x86: Fallback {str|wcs}cmp RTM in the ncmp overflow case [BZ
|
|
#28896]
|
|
Content-type: text/plain; charset=UTF-8
|
|
|
|
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.
|
|
|
|
Co-authored-by: H.J. Lu <hjl.tools@gmail.com>
|
|
---
|
|
sysdeps/x86/Makefile | 2 +-
|
|
sysdeps/x86/tst-strncmp-rtm.c | 17 ++++++++++++++++-
|
|
sysdeps/x86_64/multiarch/strcmp-avx2.S | 2 +-
|
|
sysdeps/x86_64/multiarch/strncmp-avx2-rtm.S | 1 +
|
|
sysdeps/x86_64/multiarch/strncmp-avx2.S | 1 +
|
|
sysdeps/x86_64/multiarch/wcsncmp-avx2-rtm.S | 2 +-
|
|
sysdeps/x86_64/multiarch/wcsncmp-avx2.S | 2 +-
|
|
7 files changed, 22 insertions(+), 5 deletions(-)
|
|
|
|
Conflicts:
|
|
sysdeps/x86_64/multiarch/strcmp-avx2.S
|
|
(split into two patches due to upstream bug differences)
|
|
|
|
diff --git a/sysdeps/x86/Makefile b/sysdeps/x86/Makefile
|
|
index 5be71ada..2d814915 100644
|
|
--- a/sysdeps/x86/Makefile
|
|
+++ b/sysdeps/x86/Makefile
|
|
@@ -38,7 +38,7 @@ CFLAGS-tst-memset-rtm.c += -mrtm
|
|
CFLAGS-tst-strchr-rtm.c += -mrtm
|
|
CFLAGS-tst-strcpy-rtm.c += -mrtm
|
|
CFLAGS-tst-strlen-rtm.c += -mrtm
|
|
-CFLAGS-tst-strncmp-rtm.c += -mrtm
|
|
+CFLAGS-tst-strncmp-rtm.c += -mrtm -Wno-error
|
|
CFLAGS-tst-strrchr-rtm.c += -mrtm
|
|
endif
|
|
|
|
diff --git a/sysdeps/x86/tst-strncmp-rtm.c b/sysdeps/x86/tst-strncmp-rtm.c
|
|
index 236ad951..4d0004b5 100644
|
|
--- a/sysdeps/x86/tst-strncmp-rtm.c
|
|
+++ b/sysdeps/x86/tst-strncmp-rtm.c
|
|
@@ -16,6 +16,7 @@
|
|
License along with the GNU C Library; if not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
+#include <stdint.h>
|
|
#include <tst-string-rtm.h>
|
|
|
|
#define LOOP 3000
|
|
@@ -45,8 +46,22 @@ function (void)
|
|
return 1;
|
|
}
|
|
|
|
+__attribute__ ((noinline, noclone))
|
|
+static int
|
|
+function_overflow (void)
|
|
+{
|
|
+ if (strncmp (string1, string2, SIZE_MAX) == 0)
|
|
+ return 0;
|
|
+ else
|
|
+ return 1;
|
|
+}
|
|
+
|
|
static int
|
|
do_test (void)
|
|
{
|
|
- return do_test_1 ("strncmp", LOOP, prepare, function);
|
|
+ int status = do_test_1 ("strncmp", LOOP, prepare, function);
|
|
+ if (status != EXIT_SUCCESS)
|
|
+ return status;
|
|
+ status = do_test_1 ("strncmp", LOOP, prepare, function_overflow);
|
|
+ return status;
|
|
}
|
|
diff --git a/sysdeps/x86_64/multiarch/strcmp-avx2.S b/sysdeps/x86_64/multiarch/strcmp-avx2.S
|
|
index 5d1c9d90..433ae047 100644
|
|
--- a/sysdeps/x86_64/multiarch/strcmp-avx2.S
|
|
+++ b/sysdeps/x86_64/multiarch/strcmp-avx2.S
|
|
@@ -95,7 +95,7 @@ ENTRY (STRCMP)
|
|
length to bound a valid memory region. In these cases just use
|
|
'wcscmp'. */
|
|
shrq $56, %rcx
|
|
- jnz __wcscmp_avx2
|
|
+ jnz OVERFLOW_STRCMP
|
|
# endif
|
|
/* Convert units: from wide to byte char. */
|
|
shl $2, %RDX_LP
|
|
diff --git a/sysdeps/x86_64/multiarch/strncmp-avx2-rtm.S b/sysdeps/x86_64/multiarch/strncmp-avx2-rtm.S
|
|
index 37d1224b..68bad365 100644
|
|
--- a/sysdeps/x86_64/multiarch/strncmp-avx2-rtm.S
|
|
+++ b/sysdeps/x86_64/multiarch/strncmp-avx2-rtm.S
|
|
@@ -1,3 +1,4 @@
|
|
#define STRCMP __strncmp_avx2_rtm
|
|
#define USE_AS_STRNCMP 1
|
|
+#define OVERFLOW_STRCMP __strcmp_avx2_rtm
|
|
#include "strcmp-avx2-rtm.S"
|
|
diff --git a/sysdeps/x86_64/multiarch/strncmp-avx2.S b/sysdeps/x86_64/multiarch/strncmp-avx2.S
|
|
index 1678bcc2..f138e9f1 100644
|
|
--- a/sysdeps/x86_64/multiarch/strncmp-avx2.S
|
|
+++ b/sysdeps/x86_64/multiarch/strncmp-avx2.S
|
|
@@ -1,3 +1,4 @@
|
|
#define STRCMP __strncmp_avx2
|
|
#define USE_AS_STRNCMP 1
|
|
+#define OVERFLOW_STRCMP __strcmp_avx2
|
|
#include "strcmp-avx2.S"
|
|
diff --git a/sysdeps/x86_64/multiarch/wcsncmp-avx2-rtm.S b/sysdeps/x86_64/multiarch/wcsncmp-avx2-rtm.S
|
|
index 4e88c70c..f467582c 100644
|
|
--- a/sysdeps/x86_64/multiarch/wcsncmp-avx2-rtm.S
|
|
+++ b/sysdeps/x86_64/multiarch/wcsncmp-avx2-rtm.S
|
|
@@ -1,5 +1,5 @@
|
|
#define STRCMP __wcsncmp_avx2_rtm
|
|
#define USE_AS_STRNCMP 1
|
|
#define USE_AS_WCSCMP 1
|
|
-
|
|
+#define OVERFLOW_STRCMP __wcscmp_avx2_rtm
|
|
#include "strcmp-avx2-rtm.S"
|
|
diff --git a/sysdeps/x86_64/multiarch/wcsncmp-avx2.S b/sysdeps/x86_64/multiarch/wcsncmp-avx2.S
|
|
index 4fa1de4d..e9ede522 100644
|
|
--- a/sysdeps/x86_64/multiarch/wcsncmp-avx2.S
|
|
+++ b/sysdeps/x86_64/multiarch/wcsncmp-avx2.S
|
|
@@ -1,5 +1,5 @@
|
|
#define STRCMP __wcsncmp_avx2
|
|
#define USE_AS_STRNCMP 1
|
|
#define USE_AS_WCSCMP 1
|
|
-
|
|
+#define OVERFLOW_STRCMP __wcscmp_avx2
|
|
#include "strcmp-avx2.S"
|
|
--
|
|
GitLab
|
|
|