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| author | Noah Goldstein <goldstein.w.n@gmail.com> | 2022-02-15 08:18:15 -0600 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2022-02-18 19:16:35 -0800 |
| commit | dc7befc4da908b68251d6cb3c101717ec365ab2b (patch) | |
| tree | 40c4553d301d640cbf78f018320e820e407946bd /sysdeps/x86 | |
| parent | 9e050d1370587e808bc7bc3d151c5beb417120cb (diff) | |
| download | glibc-dc7befc4da908b68251d6cb3c101717ec365ab2b.tar.gz | |
x86: Fallback {str|wcs}cmp RTM in the ncmp overflow case [BZ #28896]
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>
(cherry picked from commit c6272098323153db373f2986c67786ea8c85f1cf)
Diffstat (limited to 'sysdeps/x86')
| -rw-r--r-- | sysdeps/x86/Makefile | 2 | ||||
| -rw-r--r-- | sysdeps/x86/tst-strncmp-rtm.c | 17 |
2 files changed, 17 insertions, 2 deletions
diff --git a/sysdeps/x86/Makefile b/sysdeps/x86/Makefile index e4d0f41014..befa7cb0f6 100644 --- a/sysdeps/x86/Makefile +++ b/sysdeps/x86/Makefile @@ -43,7 +43,7 @@ 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 236ad951b5..4d0004b58a 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; } |