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commit 38e0d2479413ccdbc02b4c9e9e246eca31e956c9
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Author: Noah Goldstein <goldstein.w.n@gmail.com>
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Date: Tue Feb 15 08:18:15 2022 -0600
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x86: Fallback {str|wcs}cmp RTM in the ncmp overflow case [BZ #28896]
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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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(cherry picked from commit c6272098323153db373f2986c67786ea8c85f1cf)
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diff --git a/sysdeps/x86/Makefile b/sysdeps/x86/Makefile
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index 36ca1a7126047b86..af934d6ccf1fa337 100644
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--- a/sysdeps/x86/Makefile
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+++ b/sysdeps/x86/Makefile
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@@ -105,7 +105,7 @@ 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 236ad951b5b59cd1..4d0004b58aae428d 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 3dfcb1bf803cf9ec..fa70c994fc25dfd8 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 37d1224bb9b7056b..68bad365ba728eec 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 1678bcc235a4bc6a..f138e9f1fdcf277c 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 4e88c70cc696b82d..f467582cbedd4535 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 4fa1de4d3f1f97ff..e9ede522b8bde27d 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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