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Introduce NO_RTLD_HIDDEN, make hurd use it instead of NO_HIDDEN

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On the Hurd, the rtld needs to see its own dumb versions of a few functions
(defined in sysdeps/mach/hurd/dl-sysdep.c) overridden by libc's versions once
loaded. rtld should thus not have hidden attribute for these.  To achieve this,
the Hurd port used to just define NO_HIDDEN, which disables it completely. For
now, this changes that to disabling it for all rtld functions, for simplicity.

See Roland's comment on https://sourceware.org/bugzilla/show_bug.cgi?id=15605#c5

The ld.so numbers remain at

  8 .rel.plt      000000c8  00000c24  00000c24  00000c24  2**2
                  CONTENTS, ALLOC, LOAD, READONLY, DATA
  9 .plt          000001a0  00000cf0  00000cf0  00000cf0  2**4
                  CONTENTS, ALLOC, LOAD, READONLY, CODE
 10 .plt.got      00000010  00000e90  00000e90  00000e90  2**3
                  CONTENTS, ALLOC, LOAD, READONLY, CODE
 18 .got.plt      00000070  0002d000  0002d000  0002c000  2**2
                  CONTENTS, ALLOC, LOAD, DATA

which is about 3 times as much as on Linux.

The libc.so numbers get divided by 3 (the remainings are mostly RPC stub calls)

	* include/libc-symbols.h [NO_RTLD_HIDDEN] (rtld_hidden_proto,
	rtld_hidden_tls_proto, rtld_hidden_def, rtld_hidden_weak,
	rtld_hidden_rtld_hidden_ver, data_def, rtld_hidden_data_weak,
	rtld_hidden_data_ver): Define to empty.
	* include/assert.h [IS_IN(rtld) && NO_RTLD_HIDDEN] (__assert_fail,
	__assert_perror_fail): Likewise.
	* include/dirent.h [IS_IN(rtld) && NO_RTLD_HIDDEN]
	(__rewinddir): Likewise.
	* include/libc-internal.h [IS_IN(rtld) && NO_RTLD_HIDDEN]
	(__profile_frequency): Likewise.
	* include/setjmp.h (__sigsetjmp): Likewise.
	* include/signal.h [IS_IN(rtld) && NO_RTLD_HIDDEN] (__sigaction,
	__libc_sigaction): Likewise.
	* include/stdlib.h [NO_RTLD_HIDDEN] (unsetenv, __strtoul_internal): Do
	not set hidden attribute.
	* include/string.h [IS_IN(rtld) && NO_RTLD_HIDDEN] (__stpcpy, __strdup,
	__strerror_t, __strsep_g, memchr, memcmp, memcpy, memmove, memset,
	rawmemchr, stpcpy, strchr, strcmp, strlen, strnlen, strsep): Likewise.
	* include/sys/stat.h [IS_IN(rtld) && NO_RTLD_HIDDEN] (__fxstat,
	__fxstat64, __lxstat, __lxstat64, __xstat, __xstat64,
	__fxstatat64): Likewise.
	* include/sys/utsname.h [IS_IN(rtld) && NO_RTLD_HIDDEN]
	(__uname): Likewise.
	* include/sysdeps/generic/_itoa.h [IS_IN(rtld) && NO_RTLD_HIDDEN]
	(_itoa_upper_digits, _itoa_lower_digits): Likewise.
	* sysdeps/mach/hurd/configure.ac (NO_HIDDEN): Do not set.
	(NO_RTLD_HIDDEN): Set.
	* sysdeps/mach/hurd/configure: Refresh.
	* config.h.in: Refresh.
This commit is contained in:
Samuel Thibault 2017-10-03 01:26:58 +02:00
parent 38722448c6
commit 3d1870fa33
15 changed files with 50 additions and 14 deletions
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32
ChangeLog
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@ -1,3 +1,35 @@
2017-10-03 Samuel Thibault <samuel.thibault@ens-lyon.org>
* include/libc-symbols.h [NO_RTLD_HIDDEN] (rtld_hidden_proto,
rtld_hidden_tls_proto, rtld_hidden_def, rtld_hidden_weak,
rtld_hidden_rtld_hidden_ver, data_def, rtld_hidden_data_weak,
rtld_hidden_data_ver): Define to empty.
* include/assert.h [IS_IN(rtld) && NO_RTLD_HIDDEN] (__assert_fail,
__assert_perror_fail): Likewise.
* include/dirent.h [IS_IN(rtld) && NO_RTLD_HIDDEN]
(__rewinddir): Likewise.
* include/libc-internal.h [IS_IN(rtld) && NO_RTLD_HIDDEN]
(__profile_frequency): Likewise.
* include/setjmp.h (__sigsetjmp): Likewise.
* include/signal.h [IS_IN(rtld) && NO_RTLD_HIDDEN] (__sigaction,
__libc_sigaction): Likewise.
* include/stdlib.h [NO_RTLD_HIDDEN] (unsetenv, __strtoul_internal): Do
not set hidden attribute.
* include/string.h [IS_IN(rtld) && NO_RTLD_HIDDEN] (__stpcpy, __strdup,
__strerror_t, __strsep_g, memchr, memcmp, memcpy, memmove, memset,
rawmemchr, stpcpy, strchr, strcmp, strlen, strnlen, strsep): Likewise.
* include/sys/stat.h [IS_IN(rtld) && NO_RTLD_HIDDEN] (__fxstat,
__fxstat64, __lxstat, __lxstat64, __xstat, __xstat64,
__fxstatat64): Likewise.
* include/sys/utsname.h [IS_IN(rtld) && NO_RTLD_HIDDEN]
(__uname): Likewise.
* include/sysdeps/generic/_itoa.h [IS_IN(rtld) && NO_RTLD_HIDDEN]
(_itoa_upper_digits, _itoa_lower_digits): Likewise.
* sysdeps/mach/hurd/configure.ac (NO_HIDDEN): Do not set.
(NO_RTLD_HIDDEN): Set.
* sysdeps/mach/hurd/configure: Refresh.
* config.h.in: Refresh.
2017-10-02 Joseph Myers <joseph@codesourcery.com>
* sysdeps/ieee754/dbl-64/s_atan.c: Include <libm-alias-double.h>.

4
config.h.in
View File

@ -89,6 +89,10 @@
include/libc-symbols.h that avoid PLT slots in the shared objects. */
#undef NO_HIDDEN
/* Define this to disable in rtld the 'hidden_proto' et al macros in
include/libc-symbols.h that avoid PLT slots in the shared objects. */
#undef NO_RTLD_HIDDEN
/* Define this to disable lazy relocations in DSOs. */
#undef BIND_NOW

2
include/assert.h
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@ -20,7 +20,7 @@ extern void __assert_fail_base (const char *fmt, const char *assertion,
const char *function)
__THROW __attribute__ ((__noreturn__)) attribute_hidden;
# if IS_IN (libc) || IS_IN (rtld)
# if IS_IN (libc) || (IS_IN (rtld) && !defined NO_RTLD_HIDDEN)
hidden_proto (__assert_fail)
hidden_proto (__assert_perror_fail)
# endif

2
include/dirent.h
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@ -77,7 +77,7 @@ extern __typeof (scandirat) __scandirat;
libc_hidden_proto (__scandirat)
libc_hidden_proto (scandirat64)
# if IS_IN (rtld)
# if IS_IN (rtld) && !defined NO_RTLD_HIDDEN
extern __typeof (__rewinddir) __rewinddir attribute_hidden;
# endif
# endif

2
include/libc-internal.h
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@ -49,7 +49,7 @@ extern void __libc_thread_freeres (void);
/* Define and initialize `__progname' et. al. */
extern void __init_misc (int, char **, char **) attribute_hidden;
# if IS_IN (rtld)
# if IS_IN (rtld) && !defined NO_RTLD_HIDDEN
extern __typeof (__profile_frequency) __profile_frequency attribute_hidden;
# endif

2
include/libc-symbols.h
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@ -558,7 +558,7 @@ for linking")
# define libc_hidden_data_ver(local, name)
#endif
#if IS_IN (rtld)
#if IS_IN (rtld) && !defined NO_RTLD_HIDDEN
# define rtld_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
# define rtld_hidden_tls_proto(name, attrs...) hidden_tls_proto (name, ##attrs)
# define rtld_hidden_def(name) hidden_def (name)

2
include/setjmp.h
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@ -28,7 +28,7 @@ libc_hidden_proto (__libc_longjmp)
libc_hidden_proto (_setjmp)
libc_hidden_proto (__sigsetjmp)
# if IS_IN (rtld)
# if IS_IN (rtld) && !defined NO_RTLD_HIDDEN
extern __typeof (__sigsetjmp) __sigsetjmp attribute_hidden;
# endif
#endif

2
include/signal.h
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@ -54,7 +54,7 @@ extern int __xpg_sigpause (int sig);
/* Allocate real-time signal with highest/lowest available priority. */
extern int __libc_allocate_rtsig (int __high);
# if IS_IN (rtld)
# if IS_IN (rtld) && !defined NO_RTLD_HIDDEN
extern __typeof (__sigaction) __sigaction attribute_hidden;
extern __typeof (__libc_sigaction) __libc_sigaction attribute_hidden;
# endif

2
include/stdlib.h
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@ -294,7 +294,7 @@ struct abort_msg_s
extern struct abort_msg_s *__abort_msg;
libc_hidden_proto (__abort_msg)
# if IS_IN (rtld)
# if IS_IN (rtld) && !defined NO_RTLD_HIDDEN
extern __typeof (unsetenv) unsetenv attribute_hidden;
extern __typeof (__strtoul_internal) __strtoul_internal attribute_hidden;
# endif

2
include/string.h
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@ -143,7 +143,7 @@ libc_hidden_builtin_proto (strspn)
libc_hidden_builtin_proto (strstr)
libc_hidden_builtin_proto (ffs)
#if IS_IN (rtld)
#if IS_IN (rtld) && !defined NO_RTLD_HIDDEN
extern __typeof (__stpcpy) __stpcpy attribute_hidden;
extern __typeof (__strdup) __strdup attribute_hidden;
extern __typeof (__strerror_r) __strerror_r attribute_hidden;

4
include/sys/stat.h
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@ -14,7 +14,7 @@ extern int __mkdir (const char *__path, __mode_t __mode);
libc_hidden_proto (__mkdir)
extern int __mknod (const char *__path,
__mode_t __mode, __dev_t __dev);
#if IS_IN (libc) || IS_IN (rtld)
#if IS_IN (libc) || (IS_IN (rtld) && !defined NO_RTLD_HIDDEN)
hidden_proto (__fxstat)
hidden_proto (__fxstat64)
hidden_proto (__lxstat)
@ -37,7 +37,7 @@ libc_hidden_proto (__xmknodat)
libc_hidden_proto (__fxstatat)
libc_hidden_proto (__fxstatat64)
# if IS_IN (rtld)
# if IS_IN (rtld) && !defined NO_RTLD_HIDDEN
extern __typeof (__fxstatat64) __fxstatat64 attribute_hidden;
# endif

2
include/sys/utsname.h
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@ -7,7 +7,7 @@ extern int __uname (struct utsname *__name);
libc_hidden_proto (uname)
libc_hidden_proto (__uname)
# if IS_IN (rtld)
# if IS_IN (rtld) && !defined NO_RTLD_HIDDEN
extern __typeof (__uname) __uname attribute_hidden;
# endif
#endif

2
sysdeps/generic/_itoa.h
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@ -46,7 +46,7 @@ extern char *_itoa (unsigned long long int value, char *buflim,
extern const char _itoa_upper_digits[];
extern const char _itoa_lower_digits[];
#if IS_IN (libc) || IS_IN (rtld)
#if IS_IN (libc) || (IS_IN (rtld) && !defined NO_RTLD_HIDDEN)
hidden_proto (_itoa_upper_digits)
hidden_proto (_itoa_lower_digits)
#endif

2
sysdeps/mach/hurd/configure vendored
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@ -1,6 +1,6 @@
# This file is generated from configure.ac by Autoconf. DO NOT EDIT!
$as_echo "#define NO_HIDDEN 1" >>confdefs.h
$as_echo "#define NO_RTLD_HIDDEN 1" >>confdefs.h
if test -n "$sysheaders"; then

2
sysdeps/mach/hurd/configure.ac
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@ -3,7 +3,7 @@ GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
dnl We need this setting because of the need for PLT calls in ld.so.
dnl See Roland's comment in
dnl https://sourceware.org/bugzilla/show_bug.cgi?id=15605
AC_DEFINE([NO_HIDDEN])
AC_DEFINE([NO_RTLD_HIDDEN])
if test -n "$sysheaders"; then
OLD_CPPFLAGS=$CPPFLAGS