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List: glibc-cvs
Subject: [glibc] string: Fix bug-strncat1 with fortify enabled
From: Adhemerval Zanella via Glibc-cvs <glibc-cvs () sourceware ! org>
Date: 2023-07-24 18:54:49
Message-ID: 20230724185449.4750D3858D32 () sourceware ! org
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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=85ac7edcdf67010c223541936243427213ac87a6
commit 85ac7edcdf67010c223541936243427213ac87a6
Author: Adhemerval Zanella Netto <adhemerval.zanella@linaro.org>
Date: Fri Jul 21 09:18:16 2023 -0300
string: Fix bug-strncat1 with fortify enabled
If fortify is enabled, the truncated output warning is issued by
the wrapper itself:
bug-strncat1.c: In function ‘main':
bug-strncat1.c:14:3: error: ‘__builtin___strncat_chk' output truncated
copying 1 byte from a string of length 2 [-Werror=stringop-truncation]
14 | strncat (d, "\5\6", 1);
| ^
Checked on x86_64-linux-gnu.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Diff:
---
string/bug-strncat1.c | 14 ++++++++------
1 file changed, 8 insertions(+), 6 deletions(-)
diff --git a/string/bug-strncat1.c b/string/bug-strncat1.c
index 65a7ed58c2..cdd2141191 100644
--- a/string/bug-strncat1.c
+++ b/string/bug-strncat1.c
@@ -1,9 +1,16 @@
#undef __USE_STRING_INLINES
#define __USE_STRING_INLINES
+#include <sys/cdefs.h>
+#include <libc-diag.h>
+#if __GNUC_PREREQ (8, 0)
+/* GCC warns about strncat truncating output; this is deliberately
+ tested here. If fortify is enabled, it is also triggered by the
+ wrappers. */
+DIAG_IGNORE_NEEDS_COMMENT (8, "-Wstringop-truncation");
+#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
-#include <libc-diag.h>
char d[3] = "\0\1\2";
@@ -11,11 +18,6 @@ int
main (void)
{
DIAG_PUSH_NEEDS_COMMENT;
-#if __GNUC_PREREQ (8, 0)
- /* GCC 8 warns about strncat truncating output; this is deliberately
- tested here. */
- DIAG_IGNORE_NEEDS_COMMENT (8, "-Wstringop-truncation");
-#endif
strncat (d, "\5\6", 1);
DIAG_POP_NEEDS_COMMENT;
if (d[0] != '\5')
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