[v3,08/16] wchar: Avoid PLT entries with _FORTIFY_SOURCE
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Commit Message
The change is meant to avoid unwanted PLT entries for the wmemset and
wcrtomb routines when _FORTIFY_SOURCE is set.
On top of that, ensure that *_chk routines have their hidden builtin
definitions available.
---
debug/wcrtomb_chk.c | 1 +
debug/wmemset_chk.c | 1 +
include/wchar.h | 15 +++++++++++++++
.../ldbl-128ibm-compat/ieee128-fwprintf_chk.c | 1 +
sysdeps/x86_64/multiarch/wmemset_chk.c | 4 ++++
wcsmbs/bits/wchar2-decl.h | 4 ++--
6 files changed, 24 insertions(+), 2 deletions(-)
Comments
On 2023-06-28 04:42, Frédéric Bérat wrote:
> The change is meant to avoid unwanted PLT entries for the wmemset and
> wcrtomb routines when _FORTIFY_SOURCE is set.
>
> On top of that, ensure that *_chk routines have their hidden builtin
> definitions available.
> ---
Looks mostly OK except for a question below.
> debug/wcrtomb_chk.c | 1 +
> debug/wmemset_chk.c | 1 +
> include/wchar.h | 15 +++++++++++++++
> .../ldbl-128ibm-compat/ieee128-fwprintf_chk.c | 1 +
> sysdeps/x86_64/multiarch/wmemset_chk.c | 4 ++++
> wcsmbs/bits/wchar2-decl.h | 4 ++--
> 6 files changed, 24 insertions(+), 2 deletions(-)
>
> diff --git a/debug/wcrtomb_chk.c b/debug/wcrtomb_chk.c
> index 657be7471d..c156fe09c1 100644
> --- a/debug/wcrtomb_chk.c
> +++ b/debug/wcrtomb_chk.c
> @@ -28,3 +28,4 @@ __wcrtomb_chk (char *s, wchar_t wchar, mbstate_t *ps, size_t buflen)
> {
> return __wcrtomb_internal (s, wchar, ps, buflen);
> }
> +libc_hidden_def (__wcrtomb_chk)
> diff --git a/debug/wmemset_chk.c b/debug/wmemset_chk.c
> index e11a92815e..1e7fc4fdea 100644
> --- a/debug/wmemset_chk.c
> +++ b/debug/wmemset_chk.c
> @@ -26,3 +26,4 @@ __wmemset_chk (wchar_t *s, wchar_t c, size_t n, size_t dstlen)
>
> return wmemset (s, c, n);
> }
> +libc_hidden_builtin_def (__wmemset_chk)
> diff --git a/include/wchar.h b/include/wchar.h
> index 7b763bc24f..484e6b3fef 100644
> --- a/include/wchar.h
> +++ b/include/wchar.h
> @@ -166,6 +166,8 @@ libc_hidden_proto (putwc)
>
> libc_hidden_proto (mbrtowc)
> libc_hidden_proto (wcrtomb)
> +libc_hidden_proto (__wcrtomb_chk)
> +
> extern int __wcscmp (const wchar_t *__s1, const wchar_t *__s2)
> __THROW __attribute_pure__;
> libc_hidden_proto (__wcscmp)
> @@ -260,16 +262,25 @@ extern wchar_t *__wcschrnul (const wchar_t *__s, wchar_t __wc)
>
> extern wchar_t *__wmemset_chk (wchar_t *__s, wchar_t __c, size_t __n,
> size_t __ns) __THROW;
> +libc_hidden_builtin_proto (__wmemset_chk)
>
> extern int __vfwscanf (__FILE *__restrict __s,
> const wchar_t *__restrict __format,
> __gnuc_va_list __arg)
> attribute_hidden
> /* __attribute__ ((__format__ (__wscanf__, 2, 0)) */;
> +
> +extern int __swprintf_chk (wchar_t *__restrict __s, size_t __n,
> + int __flag, size_t __s_len,
> + const wchar_t *__restrict __format, ...)
> + __THROW /* __attribute__ ((__format__ (__wprintf__, 5, 6))) */;
> +
> extern int __fwprintf (__FILE *__restrict __s,
> const wchar_t *__restrict __format, ...)
> attribute_hidden
> /* __attribute__ ((__format__ (__wprintf__, 2, 3))) */;
> +extern int __wprintf_chk (int __flag, const wchar_t *__restrict __format,
> + ...);
> extern int __vfwprintf_chk (FILE *__restrict __s, int __flag,
> const wchar_t *__restrict __format,
> __gnuc_va_list __arg)
> @@ -279,6 +290,10 @@ extern int __vswprintf_chk (wchar_t *__restrict __s, size_t __n,
> const wchar_t *__restrict __format,
> __gnuc_va_list __arg)
> /* __attribute__ ((__format__ (__wprintf__, 5, 0))) */;
> +extern int __fwprintf_chk (__FILE *__restrict __stream, int __flag,
> + const wchar_t *__restrict __format, ...);
> +extern int __vwprintf_chk (int __flag, const wchar_t *__restrict __format,
> + __gnuc_va_list __ap);
>
> extern int __isoc99_fwscanf (__FILE *__restrict __stream,
> const wchar_t *__restrict __format, ...);
> diff --git a/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-fwprintf_chk.c b/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-fwprintf_chk.c
> index 5b6cc3e768..10658ab125 100644
> --- a/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-fwprintf_chk.c
> +++ b/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-fwprintf_chk.c
> @@ -17,6 +17,7 @@
> <https://www.gnu.org/licenses/>. */
>
> #include <stdarg.h>
> +#include <wchar.h>
> #include <libio/libioP.h>
Why do you need this?
>
> extern int
> diff --git a/sysdeps/x86_64/multiarch/wmemset_chk.c b/sysdeps/x86_64/multiarch/wmemset_chk.c
> index ac93a1f376..00edf44918 100644
> --- a/sysdeps/x86_64/multiarch/wmemset_chk.c
> +++ b/sysdeps/x86_64/multiarch/wmemset_chk.c
> @@ -28,4 +28,8 @@
>
> libc_ifunc_redirected (__redirect_wmemset_chk, __wmemset_chk,
> IFUNC_SELECTOR ());
> +# ifdef SHARED
> +__hidden_ver1 (__wmemset_chk, __GI___wmemset_chk, __redirect_wmemset_chk)
> + __attribute__ ((visibility ("hidden"))) __attribute_copy__ (__wmemset_chk);
> +# endif
> #endif
> diff --git a/wcsmbs/bits/wchar2-decl.h b/wcsmbs/bits/wchar2-decl.h
> index f3a2fd3c99..08c8ebd0e8 100644
> --- a/wcsmbs/bits/wchar2-decl.h
> +++ b/wcsmbs/bits/wchar2-decl.h
> @@ -71,7 +71,7 @@ extern wchar_t *__REDIRECT_NTH (__wmempcpy_chk_warn,
>
> extern wchar_t *__wmemset_chk (wchar_t *__s, wchar_t __c, size_t __n,
> size_t __ns) __THROW;
> -extern wchar_t *__REDIRECT_NTH (__wmemset_alias, (wchar_t *__s, wchar_t __c,
> +extern wchar_t *__REDIRECT_FORTIFY_NTH (__wmemset_alias, (wchar_t *__s, wchar_t __c,
> size_t __n), wmemset);
> extern wchar_t *__REDIRECT_NTH (__wmemset_chk_warn,
> (wchar_t *__s, wchar_t __c, size_t __n,
> @@ -203,7 +203,7 @@ extern wchar_t *__REDIRECT (__fgetws_unlocked_chk_warn,
> extern size_t __wcrtomb_chk (char *__restrict __s, wchar_t __wchar,
> mbstate_t *__restrict __p,
> size_t __buflen) __THROW __wur;
> -extern size_t __REDIRECT_NTH (__wcrtomb_alias,
> +extern size_t __REDIRECT_FORTIFY_NTH (__wcrtomb_alias,
> (char *__restrict __s, wchar_t __wchar,
> mbstate_t *__restrict __ps), wcrtomb) __wur;
>
On Fri, Jun 30, 2023 at 5:17 PM Siddhesh Poyarekar <siddhesh@gotplt.org>
wrote:
>
>
> On 2023-06-28 04:42, Frédéric Bérat wrote:
> > The change is meant to avoid unwanted PLT entries for the wmemset and
> > wcrtomb routines when _FORTIFY_SOURCE is set.
> >
> > On top of that, ensure that *_chk routines have their hidden builtin
> > definitions available.
> > ---
>
> Looks mostly OK except for a question below.
>
> > debug/wcrtomb_chk.c | 1 +
> > debug/wmemset_chk.c | 1 +
> > include/wchar.h | 15 +++++++++++++++
> > .../ldbl-128ibm-compat/ieee128-fwprintf_chk.c | 1 +
> > sysdeps/x86_64/multiarch/wmemset_chk.c | 4 ++++
> > wcsmbs/bits/wchar2-decl.h | 4 ++--
> > 6 files changed, 24 insertions(+), 2 deletions(-)
> >
> > diff --git a/debug/wcrtomb_chk.c b/debug/wcrtomb_chk.c
> > index 657be7471d..c156fe09c1 100644
> > --- a/debug/wcrtomb_chk.c
> > +++ b/debug/wcrtomb_chk.c
> > @@ -28,3 +28,4 @@ __wcrtomb_chk (char *s, wchar_t wchar, mbstate_t *ps,
> size_t buflen)
> > {
> > return __wcrtomb_internal (s, wchar, ps, buflen);
> > }
> > +libc_hidden_def (__wcrtomb_chk)
> > diff --git a/debug/wmemset_chk.c b/debug/wmemset_chk.c
> > index e11a92815e..1e7fc4fdea 100644
> > --- a/debug/wmemset_chk.c
> > +++ b/debug/wmemset_chk.c
> > @@ -26,3 +26,4 @@ __wmemset_chk (wchar_t *s, wchar_t c, size_t n, size_t
> dstlen)
> >
> > return wmemset (s, c, n);
> > }
> > +libc_hidden_builtin_def (__wmemset_chk)
> > diff --git a/include/wchar.h b/include/wchar.h
> > index 7b763bc24f..484e6b3fef 100644
> > --- a/include/wchar.h
> > +++ b/include/wchar.h
> > @@ -166,6 +166,8 @@ libc_hidden_proto (putwc)
> >
> > libc_hidden_proto (mbrtowc)
> > libc_hidden_proto (wcrtomb)
> > +libc_hidden_proto (__wcrtomb_chk)
> > +
> > extern int __wcscmp (const wchar_t *__s1, const wchar_t *__s2)
> > __THROW __attribute_pure__;
> > libc_hidden_proto (__wcscmp)
> > @@ -260,16 +262,25 @@ extern wchar_t *__wcschrnul (const wchar_t *__s,
> wchar_t __wc)
> >
> > extern wchar_t *__wmemset_chk (wchar_t *__s, wchar_t __c, size_t __n,
> > size_t __ns) __THROW;
> > +libc_hidden_builtin_proto (__wmemset_chk)
> >
> > extern int __vfwscanf (__FILE *__restrict __s,
> > const wchar_t *__restrict __format,
> > __gnuc_va_list __arg)
> > attribute_hidden
> > /* __attribute__ ((__format__ (__wscanf__, 2, 0)) */;
> > +
> > +extern int __swprintf_chk (wchar_t *__restrict __s, size_t __n,
> > + int __flag, size_t __s_len,
> > + const wchar_t *__restrict __format, ...)
> > + __THROW /* __attribute__ ((__format__ (__wprintf__, 5, 6))) */;
> > +
> > extern int __fwprintf (__FILE *__restrict __s,
> > const wchar_t *__restrict __format, ...)
> > attribute_hidden
> > /* __attribute__ ((__format__ (__wprintf__, 2, 3))) */;
> > +extern int __wprintf_chk (int __flag, const wchar_t *__restrict
> __format,
> > + ...);
> > extern int __vfwprintf_chk (FILE *__restrict __s, int __flag,
> > const wchar_t *__restrict __format,
> > __gnuc_va_list __arg)
> > @@ -279,6 +290,10 @@ extern int __vswprintf_chk (wchar_t *__restrict
> __s, size_t __n,
> > const wchar_t *__restrict __format,
> > __gnuc_va_list __arg)
> > /* __attribute__ ((__format__ (__wprintf__, 5, 0))) */;
> > +extern int __fwprintf_chk (__FILE *__restrict __stream, int __flag,
> > + const wchar_t *__restrict __format, ...);
> > +extern int __vwprintf_chk (int __flag, const wchar_t *__restrict
> __format,
> > + __gnuc_va_list __ap);
> >
> > extern int __isoc99_fwscanf (__FILE *__restrict __stream,
> > const wchar_t *__restrict __format, ...);
> > diff --git a/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-fwprintf_chk.c
> b/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-fwprintf_chk.c
> > index 5b6cc3e768..10658ab125 100644
> > --- a/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-fwprintf_chk.c
> > +++ b/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-fwprintf_chk.c
> > @@ -17,6 +17,7 @@
> > <https://www.gnu.org/licenses/>. */
> >
> > #include <stdarg.h>
> > +#include <wchar.h>
> > #include <libio/libioP.h>
>
> Why do you need this?
>
Probably a leftover from my investigation. I'll double check.
>
> > extern int
> > diff --git a/sysdeps/x86_64/multiarch/wmemset_chk.c
> b/sysdeps/x86_64/multiarch/wmemset_chk.c
> > index ac93a1f376..00edf44918 100644
> > --- a/sysdeps/x86_64/multiarch/wmemset_chk.c
> > +++ b/sysdeps/x86_64/multiarch/wmemset_chk.c
> > @@ -28,4 +28,8 @@
> >
> > libc_ifunc_redirected (__redirect_wmemset_chk, __wmemset_chk,
> > IFUNC_SELECTOR ());
> > +# ifdef SHARED
> > +__hidden_ver1 (__wmemset_chk, __GI___wmemset_chk,
> __redirect_wmemset_chk)
> > + __attribute__ ((visibility ("hidden"))) __attribute_copy__
> (__wmemset_chk);
> > +# endif
> > #endif
> > diff --git a/wcsmbs/bits/wchar2-decl.h b/wcsmbs/bits/wchar2-decl.h
> > index f3a2fd3c99..08c8ebd0e8 100644
> > --- a/wcsmbs/bits/wchar2-decl.h
> > +++ b/wcsmbs/bits/wchar2-decl.h
> > @@ -71,7 +71,7 @@ extern wchar_t *__REDIRECT_NTH (__wmempcpy_chk_warn,
> >
> > extern wchar_t *__wmemset_chk (wchar_t *__s, wchar_t __c, size_t __n,
> > size_t __ns) __THROW;
> > -extern wchar_t *__REDIRECT_NTH (__wmemset_alias, (wchar_t *__s, wchar_t
> __c,
> > +extern wchar_t *__REDIRECT_FORTIFY_NTH (__wmemset_alias, (wchar_t *__s,
> wchar_t __c,
> > size_t __n),
> wmemset);
> > extern wchar_t *__REDIRECT_NTH (__wmemset_chk_warn,
> > (wchar_t *__s, wchar_t __c, size_t __n,
> > @@ -203,7 +203,7 @@ extern wchar_t *__REDIRECT
> (__fgetws_unlocked_chk_warn,
> > extern size_t __wcrtomb_chk (char *__restrict __s, wchar_t __wchar,
> > mbstate_t *__restrict __p,
> > size_t __buflen) __THROW __wur;
> > -extern size_t __REDIRECT_NTH (__wcrtomb_alias,
> > +extern size_t __REDIRECT_FORTIFY_NTH (__wcrtomb_alias,
> > (char *__restrict __s, wchar_t
> __wchar,
> > mbstate_t *__restrict __ps),
> wcrtomb) __wur;
> >
>
>
@@ -28,3 +28,4 @@ __wcrtomb_chk (char *s, wchar_t wchar, mbstate_t *ps, size_t buflen)
{
return __wcrtomb_internal (s, wchar, ps, buflen);
}
+libc_hidden_def (__wcrtomb_chk)
@@ -26,3 +26,4 @@ __wmemset_chk (wchar_t *s, wchar_t c, size_t n, size_t dstlen)
return wmemset (s, c, n);
}
+libc_hidden_builtin_def (__wmemset_chk)
@@ -166,6 +166,8 @@ libc_hidden_proto (putwc)
libc_hidden_proto (mbrtowc)
libc_hidden_proto (wcrtomb)
+libc_hidden_proto (__wcrtomb_chk)
+
extern int __wcscmp (const wchar_t *__s1, const wchar_t *__s2)
__THROW __attribute_pure__;
libc_hidden_proto (__wcscmp)
@@ -260,16 +262,25 @@ extern wchar_t *__wcschrnul (const wchar_t *__s, wchar_t __wc)
extern wchar_t *__wmemset_chk (wchar_t *__s, wchar_t __c, size_t __n,
size_t __ns) __THROW;
+libc_hidden_builtin_proto (__wmemset_chk)
extern int __vfwscanf (__FILE *__restrict __s,
const wchar_t *__restrict __format,
__gnuc_va_list __arg)
attribute_hidden
/* __attribute__ ((__format__ (__wscanf__, 2, 0)) */;
+
+extern int __swprintf_chk (wchar_t *__restrict __s, size_t __n,
+ int __flag, size_t __s_len,
+ const wchar_t *__restrict __format, ...)
+ __THROW /* __attribute__ ((__format__ (__wprintf__, 5, 6))) */;
+
extern int __fwprintf (__FILE *__restrict __s,
const wchar_t *__restrict __format, ...)
attribute_hidden
/* __attribute__ ((__format__ (__wprintf__, 2, 3))) */;
+extern int __wprintf_chk (int __flag, const wchar_t *__restrict __format,
+ ...);
extern int __vfwprintf_chk (FILE *__restrict __s, int __flag,
const wchar_t *__restrict __format,
__gnuc_va_list __arg)
@@ -279,6 +290,10 @@ extern int __vswprintf_chk (wchar_t *__restrict __s, size_t __n,
const wchar_t *__restrict __format,
__gnuc_va_list __arg)
/* __attribute__ ((__format__ (__wprintf__, 5, 0))) */;
+extern int __fwprintf_chk (__FILE *__restrict __stream, int __flag,
+ const wchar_t *__restrict __format, ...);
+extern int __vwprintf_chk (int __flag, const wchar_t *__restrict __format,
+ __gnuc_va_list __ap);
extern int __isoc99_fwscanf (__FILE *__restrict __stream,
const wchar_t *__restrict __format, ...);
@@ -17,6 +17,7 @@
<https://www.gnu.org/licenses/>. */
#include <stdarg.h>
+#include <wchar.h>
#include <libio/libioP.h>
extern int
@@ -28,4 +28,8 @@
libc_ifunc_redirected (__redirect_wmemset_chk, __wmemset_chk,
IFUNC_SELECTOR ());
+# ifdef SHARED
+__hidden_ver1 (__wmemset_chk, __GI___wmemset_chk, __redirect_wmemset_chk)
+ __attribute__ ((visibility ("hidden"))) __attribute_copy__ (__wmemset_chk);
+# endif
#endif
@@ -71,7 +71,7 @@ extern wchar_t *__REDIRECT_NTH (__wmempcpy_chk_warn,
extern wchar_t *__wmemset_chk (wchar_t *__s, wchar_t __c, size_t __n,
size_t __ns) __THROW;
-extern wchar_t *__REDIRECT_NTH (__wmemset_alias, (wchar_t *__s, wchar_t __c,
+extern wchar_t *__REDIRECT_FORTIFY_NTH (__wmemset_alias, (wchar_t *__s, wchar_t __c,
size_t __n), wmemset);
extern wchar_t *__REDIRECT_NTH (__wmemset_chk_warn,
(wchar_t *__s, wchar_t __c, size_t __n,
@@ -203,7 +203,7 @@ extern wchar_t *__REDIRECT (__fgetws_unlocked_chk_warn,
extern size_t __wcrtomb_chk (char *__restrict __s, wchar_t __wchar,
mbstate_t *__restrict __p,
size_t __buflen) __THROW __wur;
-extern size_t __REDIRECT_NTH (__wcrtomb_alias,
+extern size_t __REDIRECT_FORTIFY_NTH (__wcrtomb_alias,
(char *__restrict __s, wchar_t __wchar,
mbstate_t *__restrict __ps), wcrtomb) __wur;