From: Stefan Liebler <stli@linux.ibm.com>
To: libc-alpha@sourceware.org
Cc: msebor@redhat.com, Stefan Liebler <stli@linux.ibm.com>
Subject: [PATCH] Fix stringop-overflow warning in bug-regex19.c.
Date: Wed, 12 May 2021 08:33:45 +0200 [thread overview]
Message-ID: <20210512063345.2269779-1-stli@linux.ibm.com> (raw)
Starting with commit
26492c0a14966c32c43cd6ca1d0dca5e62c6cfef
"Annotate additional APIs with GCC attribute access.",
gcc emits this warning on s390x:
In function ‘do_one_test’,
inlined from ‘do_mb_tests’ at bug-regex19.c:385:11:
bug-regex19.c:271:9: error: ‘re_search’ specified size 18446744073709551615 exceeds maximum object size 9223372036854775807 [-Werror=stringop-overflow=]
271 | res = re_search (®buf, test->string, strlen (test->string),
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
272 | test->start, strlen (test->string) - test->start, NULL);
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from ../include/regex.h:2,
from bug-regex19.c:22:
bug-regex19.c: In function ‘do_mb_tests’:
../posix/regex.h:554:17: note: in a call to function ‘re_search’ declared with attribute ‘read_only (2, 3)’
554 | extern regoff_t re_search (struct re_pattern_buffer *__buffer,
| ^~~~~~~~~
...
The function do_one_test is inlined into do_mb_tests on s390x (at least with
gcc 10). If do_one_test is marked with __attribute__ ((noinline)), there are
no warnings on s390x. If do_one_test is marked with
__attribute__ ((always_inline)), there are the same warnings on x86_64.
test->string points to a variable length array on stack of do_mb_tests
and the content is generated based on the passed test struct.
---
posix/bug-regex19.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/posix/bug-regex19.c b/posix/bug-regex19.c
index 9bbffb17e3..fcae533762 100644
--- a/posix/bug-regex19.c
+++ b/posix/bug-regex19.c
@@ -251,6 +251,7 @@ static struct test_s
};
int
+__attribute__ ((noinline))
do_one_test (const struct test_s *test, const char *fail)
{
int res;
--
2.30.2
next reply other threads:[~2021-05-12 6:34 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-12 6:33 Stefan Liebler [this message]
2021-05-12 15:56 ` Martin Sebor
2021-05-13 17:04 ` Martin Sebor
2021-05-17 14:23 ` Stefan Liebler
2021-05-17 15:22 ` Martin Sebor
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