glibc/SOURCES/glibc-rh2033684-3.patch

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2022-03-24 09:14:21 +00:00
commit 7163ace3318d666d40771f5c8e7c4a148827070f
Author: Siddhesh Poyarekar <siddhesh@sourceware.org>
Date: Thu Nov 12 12:09:56 2020 +0530
Use __builtin___stpncpy_chk when available
The builtin has been available in gcc since 4.7.0 and in clang since
2.6. This fixes stpncpy fortification with clang since it does a
better job of plugging in __stpncpy_chk in the right place than the
header hackery.
This has been tested by building and running all tests with gcc 10.2.1
and also with clang tip as of a few days ago (just the tests in debug/
since running all tests don't work with clang at the moment) to make
sure that both compilers pass the stpncpy tests.
diff --git a/string/bits/string_fortified.h b/string/bits/string_fortified.h
index a07ab0dbc8c8dd5b..4ed6755a6c1ca247 100644
--- a/string/bits/string_fortified.h
+++ b/string/bits/string_fortified.h
@@ -106,7 +106,13 @@ __NTH (strncpy (char *__restrict __dest, const char *__restrict __src,
return __builtin___strncpy_chk (__dest, __src, __len, __bos (__dest));
}
-/* XXX We have no corresponding builtin yet. */
+#if __GNUC_PREREQ (4, 7) || __glibc_clang_prereq (2, 6)
+__fortify_function char *
+__NTH (stpncpy (char *__dest, const char *__src, size_t __n))
+{
+ return __builtin___stpncpy_chk (__dest, __src, __n, __bos (__dest));
+}
+#else
extern char *__stpncpy_chk (char *__dest, const char *__src, size_t __n,
size_t __destlen) __THROW;
extern char *__REDIRECT_NTH (__stpncpy_alias, (char *__dest, const char *__src,
@@ -120,6 +126,7 @@ __NTH (stpncpy (char *__dest, const char *__src, size_t __n))
return __stpncpy_chk (__dest, __src, __n, __bos (__dest));
return __stpncpy_alias (__dest, __src, __n);
}
+#endif
__fortify_function char *