72 lines
2.2 KiB
Diff
72 lines
2.2 KiB
Diff
|
commit e123f08ad5ea4691bc37430ce536988c221332d6
|
||
|
|
Author: Noah Goldstein <goldstein.w.n@gmail.com>
|
||
|
|
Date: Thu Mar 24 15:50:33 2022 -0500
|
||
|
|
|
||
|
|
x86: Fix fallback for wcsncmp_avx2 in strcmp-avx2.S [BZ #28896]
|
||
|
|
|
||
|
|
Overflow case for __wcsncmp_avx2_rtm should be __wcscmp_avx2_rtm not
|
||
|
|
__wcscmp_avx2.
|
||
|
|
|
||
|
|
commit ddf0992cf57a93200e0c782e2a94d0733a5a0b87
|
||
|
|
Author: Noah Goldstein <goldstein.w.n@gmail.com>
|
||
|
|
Date: Sun Jan 9 16:02:21 2022 -0600
|
||
|
|
|
||
|
|
x86: Fix __wcsncmp_avx2 in strcmp-avx2.S [BZ# 28755]
|
||
|
|
|
||
|
|
Set the wrong fallback function for `__wcsncmp_avx2_rtm`. It was set
|
||
|
|
to fallback on to `__wcscmp_avx2` instead of `__wcscmp_avx2_rtm` which
|
||
|
|
can cause spurious aborts.
|
||
|
|
|
||
|
|
This change will need to be backported.
|
||
|
|
|
||
|
|
All string/memory tests pass.
|
||
|
|
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
|
||
|
|
|
||
|
|
(cherry picked from commit 9fef7039a7d04947bc89296ee0d187bc8d89b772)
|
||
|
|
|
||
|
|
diff --git a/sysdeps/x86/tst-strncmp-rtm.c b/sysdeps/x86/tst-strncmp-rtm.c
|
||
|
|
index aef9866cf2fbe774..ba6543be8ce13927 100644
|
||
|
|
--- a/sysdeps/x86/tst-strncmp-rtm.c
|
||
|
|
+++ b/sysdeps/x86/tst-strncmp-rtm.c
|
||
|
|
@@ -70,6 +70,16 @@ function_overflow (void)
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
+__attribute__ ((noinline, noclone))
|
||
|
|
+static int
|
||
|
|
+function_overflow2 (void)
|
||
|
|
+{
|
||
|
|
+ if (STRNCMP (string1, string2, SIZE_MAX >> 4) == 0)
|
||
|
|
+ return 0;
|
||
|
|
+ else
|
||
|
|
+ return 1;
|
||
|
|
+}
|
||
|
|
+
|
||
|
|
static int
|
||
|
|
do_test (void)
|
||
|
|
{
|
||
|
|
@@ -77,5 +87,10 @@ do_test (void)
|
||
|
|
if (status != EXIT_SUCCESS)
|
||
|
|
return status;
|
||
|
|
status = do_test_1 (TEST_NAME, LOOP, prepare, function_overflow);
|
||
|
|
+ if (status != EXIT_SUCCESS)
|
||
|
|
+ return status;
|
||
|
|
+ status = do_test_1 (TEST_NAME, LOOP, prepare, function_overflow2);
|
||
|
|
+ if (status != EXIT_SUCCESS)
|
||
|
|
+ return status;
|
||
|
|
return status;
|
||
|
|
}
|
||
|
|
diff --git a/sysdeps/x86_64/multiarch/strcmp-avx2.S b/sysdeps/x86_64/multiarch/strcmp-avx2.S
|
||
|
|
index f9bdc5ccd03aa1f9..09a73942086f9c9f 100644
|
||
|
|
--- a/sysdeps/x86_64/multiarch/strcmp-avx2.S
|
||
|
|
+++ b/sysdeps/x86_64/multiarch/strcmp-avx2.S
|
||
|
|
@@ -122,7 +122,7 @@ ENTRY(STRCMP)
|
||
|
|
are cases where length is large enough that it can never be a
|
||
|
|
bound on valid memory so just use wcscmp. */
|
||
|
|
shrq $56, %rcx
|
||
|
|
- jnz __wcscmp_avx2
|
||
|
|
+ jnz OVERFLOW_STRCMP
|
||
|
|
|
||
|
|
leaq (, %rdx, 4), %rdx
|
||
|
|
# endif
|