mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-27 05:00:15 +00:00
85ac7edcdf
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>
41 lines
771 B
C
41 lines
771 B
C
#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>
|
|
|
|
char d[3] = "\0\1\2";
|
|
|
|
int
|
|
main (void)
|
|
{
|
|
DIAG_PUSH_NEEDS_COMMENT;
|
|
strncat (d, "\5\6", 1);
|
|
DIAG_POP_NEEDS_COMMENT;
|
|
if (d[0] != '\5')
|
|
{
|
|
puts ("d[0] != '\\5'");
|
|
exit (1);
|
|
}
|
|
if (d[1] != '\0')
|
|
{
|
|
puts ("d[1] != '\\0'");
|
|
exit (1);
|
|
}
|
|
if (d[2] != '\2')
|
|
{
|
|
puts ("d[2] != '\\2'");
|
|
exit (1);
|
|
}
|
|
|
|
return 0;
|
|
}
|