2017-01-01 00:14:16 +00:00
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/* Copyright (C) 1998-2017 Free Software Foundation, Inc.
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1998-03-06 17:21:43 +00:00
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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2001-07-06 04:58:11 +00:00
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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1998-03-06 17:21:43 +00:00
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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2001-07-06 04:58:11 +00:00
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Lesser General Public License for more details.
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1998-03-06 17:21:43 +00:00
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2001-07-06 04:58:11 +00:00
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You should have received a copy of the GNU Lesser General Public
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2012-02-09 23:18:22 +00:00
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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1998-03-06 17:21:43 +00:00
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2013-03-28 23:15:48 +00:00
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#include <assert.h>
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1998-03-08 15:26:29 +00:00
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#include <stdlib.h>
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2002-12-01 22:14:57 +00:00
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#include <stdio.h>
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1998-03-08 15:26:29 +00:00
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#include <unistd.h>
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2000-03-23 20:31:46 +00:00
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#include <ldsodefs.h>
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2014-05-13 16:49:20 +00:00
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#include <exit-thread.h>
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2016-12-31 18:02:17 +00:00
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#include <libc-internal.h>
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#include <elf/dl-tunables.h>
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1998-03-08 15:26:29 +00:00
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1998-03-18 14:42:25 +00:00
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extern void __libc_init_first (int argc, char **argv, char **envp);
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2002-09-15 02:37:32 +00:00
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#include <tls.h>
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2000-07-06 21:16:06 +00:00
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#ifndef SHARED
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2002-12-01 22:14:57 +00:00
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# include <dl-osinfo.h>
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2005-06-26 18:14:26 +00:00
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# ifndef THREAD_SET_STACK_GUARD
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/* Only exported for architectures that don't store the stack guard canary
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in thread local area. */
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uintptr_t __stack_chk_guard attribute_relro;
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# endif
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2013-09-23 04:52:09 +00:00
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# ifndef THREAD_SET_POINTER_GUARD
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/* Only exported for architectures that don't store the pointer guard
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value in thread local area. */
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uintptr_t __pointer_chk_guard_local
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attribute_relro attribute_hidden __attribute__ ((nocommon));
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# endif
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2000-07-06 21:16:06 +00:00
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#endif
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2003-02-14 23:31:11 +00:00
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#ifdef HAVE_PTR_NTHREADS
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/* We need atomic operations. */
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# include <atomic.h>
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#endif
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2000-11-20 09:16:41 +00:00
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2012-08-21 22:01:27 +00:00
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#ifndef SHARED
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# include <link.h>
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# include <dl-irel.h>
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# ifdef ELF_MACHINE_IRELA
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# define IREL_T ElfW(Rela)
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# define IPLT_START __rela_iplt_start
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# define IPLT_END __rela_iplt_end
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# define IREL elf_irela
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# elif defined ELF_MACHINE_IREL
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# define IREL_T ElfW(Rel)
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# define IPLT_START __rel_iplt_start
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# define IPLT_END __rel_iplt_end
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# define IREL elf_irel
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# endif
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static void
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apply_irel (void)
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{
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2012-08-22 19:53:38 +00:00
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# ifdef IREL
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/* We use weak references for these so that we'll still work with a linker
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that doesn't define them. Such a linker doesn't support IFUNC at all
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and so uses won't work, but a statically-linked program that doesn't
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use any IFUNC symbols won't have a problem. */
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extern const IREL_T IPLT_START[] __attribute__ ((weak));
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extern const IREL_T IPLT_END[] __attribute__ ((weak));
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2012-08-21 22:01:27 +00:00
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for (const IREL_T *ipltent = IPLT_START; ipltent < IPLT_END; ++ipltent)
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IREL (ipltent);
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2012-08-22 19:53:38 +00:00
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# endif
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2012-08-21 22:01:27 +00:00
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}
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#endif
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2003-03-15 23:09:11 +00:00
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#ifdef LIBC_START_MAIN
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2004-02-20 06:07:55 +00:00
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# ifdef LIBC_START_DISABLE_INLINE
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# define STATIC static
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# else
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# define STATIC static inline __attribute__ ((always_inline))
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# endif
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2003-03-15 23:09:11 +00:00
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#else
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# define STATIC
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2013-02-14 13:12:02 +00:00
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# define LIBC_START_MAIN __libc_start_main
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2003-03-15 23:09:11 +00:00
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#endif
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#ifdef MAIN_AUXVEC_ARG
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2003-04-12 00:58:26 +00:00
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/* main gets passed a pointer to the auxiliary. */
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# define MAIN_AUXVEC_DECL , void *
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# define MAIN_AUXVEC_PARAM , auxvec
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#else
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# define MAIN_AUXVEC_DECL
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# define MAIN_AUXVEC_PARAM
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2003-03-15 23:09:11 +00:00
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#endif
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2017-05-31 01:08:32 +00:00
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#ifndef ARCH_INIT_CPU_FEATURES
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# define ARCH_INIT_CPU_FEATURES()
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#endif
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2017-07-17 20:48:59 +00:00
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#include <libc-start.h>
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2003-04-12 00:58:26 +00:00
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STATIC int LIBC_START_MAIN (int (*main) (int, char **, char **
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MAIN_AUXVEC_DECL),
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2003-03-15 23:09:11 +00:00
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int argc,
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2013-02-13 23:30:40 +00:00
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char **argv,
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2003-03-15 23:09:11 +00:00
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#ifdef LIBC_START_MAIN_AUXVEC_ARG
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2013-02-13 23:30:40 +00:00
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ElfW(auxv_t) *auxvec,
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2003-03-15 23:09:11 +00:00
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#endif
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__typeof (main) init,
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void (*fini) (void),
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void (*rtld_fini) (void),
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2013-02-13 23:30:40 +00:00
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void *stack_end)
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2000-11-20 09:16:41 +00:00
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__attribute__ ((noreturn));
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1999-07-09 16:18:17 +00:00
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2005-01-06 22:40:27 +00:00
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2005-02-14 21:25:50 +00:00
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/* Note: the fini parameter is ignored here for shared library. It
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is registered with __cxa_atexit. This had the disadvantage that
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finalizers were called in more than one place. */
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2003-03-15 23:09:11 +00:00
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STATIC int
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2003-04-12 00:58:26 +00:00
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LIBC_START_MAIN (int (*main) (int, char **, char ** MAIN_AUXVEC_DECL),
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2013-02-13 23:30:40 +00:00
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int argc, char **argv,
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2003-03-15 23:09:11 +00:00
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#ifdef LIBC_START_MAIN_AUXVEC_ARG
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2013-02-13 23:30:40 +00:00
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ElfW(auxv_t) *auxvec,
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2003-03-15 23:09:11 +00:00
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#endif
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__typeof (main) init,
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void (*fini) (void),
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2013-02-13 23:30:40 +00:00
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void (*rtld_fini) (void), void *stack_end)
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1998-03-06 17:21:43 +00:00
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{
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2002-09-15 02:37:32 +00:00
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/* Result of the 'main' function. */
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int result;
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__libc_multiple_libcs = &_dl_starting_up && !_dl_starting_up;
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1998-06-07 14:06:56 +00:00
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2005-01-04 07:11:05 +00:00
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#ifndef SHARED
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Add --enable-static-pie configure option to build static PIE [BZ #19574]
Static PIE extends address space layout randomization to static
executables. It provides additional security hardening benefits at
the cost of some memory and performance.
Dynamic linker, ld.so, is a standalone program which can be loaded at
any address. This patch adds a configure option, --enable-static-pie,
to embed the part of ld.so in static executable to create static position
independent executable (static PIE). A static PIE is similar to static
executable, but can be loaded at any address without help from a dynamic
linker. When --enable-static-pie is used to configure glibc, libc.a is
built as PIE and all static executables, including tests, are built as
static PIE. The resulting libc.a can be used together with GCC 8 or
above to build static PIE with the compiler option, -static-pie. But
GCC 8 isn't required to build glibc with --enable-static-pie. Only GCC
with PIE support is needed. When an older GCC is used to build glibc
with --enable-static-pie, proper input files are passed to linker to
create static executables as static PIE, together with "-z text" to
prevent dynamic relocations in read-only segments, which are not allowed
in static PIE.
The following changes are made for static PIE:
1. Add a new function, _dl_relocate_static_pie, to:
a. Get the run-time load address.
b. Read the dynamic section.
c. Perform dynamic relocations.
Dynamic linker also performs these steps. But static PIE doesn't load
any shared objects.
2. Call _dl_relocate_static_pie at entrance of LIBC_START_MAIN in
libc.a. crt1.o, which is used to create dynamic and non-PIE static
executables, is updated to include a dummy _dl_relocate_static_pie.
rcrt1.o is added to create static PIE, which will link in the real
_dl_relocate_static_pie. grcrt1.o is also added to create static PIE
with -pg. GCC 8 has been updated to support rcrt1.o and grcrt1.o for
static PIE.
Static PIE can work on all architectures which support PIE, provided:
1. Target must support accessing of local functions without dynamic
relocations, which is needed in start.S to call __libc_start_main with
function addresses of __libc_csu_init, __libc_csu_fini and main. All
functions in static PIE are local functions. If PIE start.S can't reach
main () defined in a shared object, the code sequence:
pass address of local_main to __libc_start_main
...
local_main:
tail call to main via PLT
can be used.
2. start.S is updated to check PIC instead SHARED for PIC code path and
avoid dynamic relocation, when PIC is defined and SHARED isn't defined,
to support static PIE.
3. All assembly codes are updated check PIC instead SHARED for PIC code
path to avoid dynamic relocations in read-only sections.
4. All assembly codes are updated check SHARED instead PIC for static
symbol name.
5. elf_machine_load_address in dl-machine.h are updated to support static
PIE.
6. __brk works without TLS nor dynamic relocations in read-only section
so that it can be used by __libc_setup_tls to initializes TLS in static
PIE.
NB: When glibc is built with GCC defaulted to PIE, libc.a is compiled
with -fPIE, regardless if --enable-static-pie is used to configure glibc.
When glibc is configured with --enable-static-pie, libc.a is compiled
with -fPIE, regardless whether GCC defaults to PIE or not. The same
libc.a can be used to build both static executable and static PIE.
There is no need for separate PIE copy of libc.a.
On x86-64, the normal static sln:
text data bss dec hex filename
625425 8284 5456 639165 9c0bd elf/sln
the static PIE sln:
text data bss dec hex filename
657626 20636 5392 683654 a6e86 elf/sln
The code size is increased by 5% and the binary size is increased by 7%.
Linker requirements to build glibc with --enable-static-pie:
1. Linker supports --no-dynamic-linker to remove PT_INTERP segment from
static PIE.
2. Linker can create working static PIE. The x86-64 linker needs the
fix for
https://sourceware.org/bugzilla/show_bug.cgi?id=21782
The i386 linker needs to be able to convert "movl main@GOT(%ebx), %eax"
to "leal main@GOTOFF(%ebx), %eax" if main is defined locally.
Binutils 2.29 or above are OK for i686 and x86-64. But linker status for
other targets need to be verified.
3. Linker should resolve undefined weak symbols to 0 in static PIE:
https://sourceware.org/bugzilla/show_bug.cgi?id=22269
4. Many ELF backend linkers incorrectly check bfd_link_pic for TLS
relocations, which should check bfd_link_executable instead:
https://sourceware.org/bugzilla/show_bug.cgi?id=22263
Tested on aarch64, i686 and x86-64.
Using GCC 7 and binutils master branch, build-many-glibcs.py with
--enable-static-pie with all patches for static PIE applied have the
following build successes:
PASS: glibcs-aarch64_be-linux-gnu build
PASS: glibcs-aarch64-linux-gnu build
PASS: glibcs-armeb-linux-gnueabi-be8 build
PASS: glibcs-armeb-linux-gnueabi build
PASS: glibcs-armeb-linux-gnueabihf-be8 build
PASS: glibcs-armeb-linux-gnueabihf build
PASS: glibcs-arm-linux-gnueabi build
PASS: glibcs-arm-linux-gnueabihf build
PASS: glibcs-arm-linux-gnueabihf-v7a build
PASS: glibcs-arm-linux-gnueabihf-v7a-disable-multi-arch build
PASS: glibcs-m68k-linux-gnu build
PASS: glibcs-microblazeel-linux-gnu build
PASS: glibcs-microblaze-linux-gnu build
PASS: glibcs-mips64el-linux-gnu-n32 build
PASS: glibcs-mips64el-linux-gnu-n32-nan2008 build
PASS: glibcs-mips64el-linux-gnu-n32-nan2008-soft build
PASS: glibcs-mips64el-linux-gnu-n32-soft build
PASS: glibcs-mips64el-linux-gnu-n64 build
PASS: glibcs-mips64el-linux-gnu-n64-nan2008 build
PASS: glibcs-mips64el-linux-gnu-n64-nan2008-soft build
PASS: glibcs-mips64el-linux-gnu-n64-soft build
PASS: glibcs-mips64-linux-gnu-n32 build
PASS: glibcs-mips64-linux-gnu-n32-nan2008 build
PASS: glibcs-mips64-linux-gnu-n32-nan2008-soft build
PASS: glibcs-mips64-linux-gnu-n32-soft build
PASS: glibcs-mips64-linux-gnu-n64 build
PASS: glibcs-mips64-linux-gnu-n64-nan2008 build
PASS: glibcs-mips64-linux-gnu-n64-nan2008-soft build
PASS: glibcs-mips64-linux-gnu-n64-soft build
PASS: glibcs-mipsel-linux-gnu build
PASS: glibcs-mipsel-linux-gnu-nan2008 build
PASS: glibcs-mipsel-linux-gnu-nan2008-soft build
PASS: glibcs-mipsel-linux-gnu-soft build
PASS: glibcs-mips-linux-gnu build
PASS: glibcs-mips-linux-gnu-nan2008 build
PASS: glibcs-mips-linux-gnu-nan2008-soft build
PASS: glibcs-mips-linux-gnu-soft build
PASS: glibcs-nios2-linux-gnu build
PASS: glibcs-powerpc64le-linux-gnu build
PASS: glibcs-powerpc64-linux-gnu build
PASS: glibcs-tilegxbe-linux-gnu-32 build
PASS: glibcs-tilegxbe-linux-gnu build
PASS: glibcs-tilegx-linux-gnu-32 build
PASS: glibcs-tilegx-linux-gnu build
PASS: glibcs-tilepro-linux-gnu build
and the following build failures:
FAIL: glibcs-alpha-linux-gnu build
elf/sln is failed to link due to:
assertion fail bfd/elf64-alpha.c:4125
This is caused by linker bug and/or non-PIC code in PIE libc.a.
FAIL: glibcs-hppa-linux-gnu build
elf/sln is failed to link due to:
collect2: fatal error: ld terminated with signal 11 [Segmentation fault]
https://sourceware.org/bugzilla/show_bug.cgi?id=22537
FAIL: glibcs-ia64-linux-gnu build
elf/sln is failed to link due to:
collect2: fatal error: ld terminated with signal 11 [Segmentation fault]
FAIL: glibcs-powerpc-linux-gnu build
FAIL: glibcs-powerpc-linux-gnu-soft build
FAIL: glibcs-powerpc-linux-gnuspe build
FAIL: glibcs-powerpc-linux-gnuspe-e500v1 build
elf/sln is failed to link due to:
ld: read-only segment has dynamic relocations.
This is caused by linker bug and/or non-PIC code in PIE libc.a. See:
https://sourceware.org/bugzilla/show_bug.cgi?id=22264
FAIL: glibcs-powerpc-linux-gnu-power4 build
elf/sln is failed to link due to:
findlocale.c:96:(.text+0x22c): @local call to ifunc memchr
This is caused by linker bug and/or non-PIC code in PIE libc.a.
FAIL: glibcs-s390-linux-gnu build
elf/sln is failed to link due to:
collect2: fatal error: ld terminated with signal 11 [Segmentation fault], core dumped
assertion fail bfd/elflink.c:14299
This is caused by linker bug and/or non-PIC code in PIE libc.a.
FAIL: glibcs-sh3eb-linux-gnu build
FAIL: glibcs-sh3-linux-gnu build
FAIL: glibcs-sh4eb-linux-gnu build
FAIL: glibcs-sh4eb-linux-gnu-soft build
FAIL: glibcs-sh4-linux-gnu build
FAIL: glibcs-sh4-linux-gnu-soft build
elf/sln is failed to link due to:
ld: read-only segment has dynamic relocations.
This is caused by linker bug and/or non-PIC code in PIE libc.a. See:
https://sourceware.org/bugzilla/show_bug.cgi?id=22263
Also TLS code sequence in SH assembly syscalls in glibc doesn't match TLS
code sequence expected by ld:
https://sourceware.org/bugzilla/show_bug.cgi?id=22270
FAIL: glibcs-sparc64-linux-gnu build
FAIL: glibcs-sparcv9-linux-gnu build
FAIL: glibcs-tilegxbe-linux-gnu build
FAIL: glibcs-tilegxbe-linux-gnu-32 build
FAIL: glibcs-tilegx-linux-gnu build
FAIL: glibcs-tilegx-linux-gnu-32 build
FAIL: glibcs-tilepro-linux-gnu build
elf/sln is failed to link due to:
ld: read-only segment has dynamic relocations.
This is caused by linker bug and/or non-PIC code in PIE libc.a. See:
https://sourceware.org/bugzilla/show_bug.cgi?id=22263
[BZ #19574]
* INSTALL: Regenerated.
* Makeconfig (real-static-start-installed-name): New.
(pic-default): Updated for --enable-static-pie.
(pie-default): New for --enable-static-pie.
(default-pie-ldflag): Likewise.
(+link-static-before-libc): Replace $(DEFAULT-LDFLAGS-$(@F))
with $(if $($(@F)-no-pie),$(no-pie-ldflag),$(default-pie-ldflag)).
Replace $(static-start-installed-name) with
$(real-static-start-installed-name).
(+prectorT): Updated for --enable-static-pie.
(+postctorT): Likewise.
(CFLAGS-.o): Add $(pie-default).
(CFLAGS-.op): Likewise.
* NEWS: Mention --enable-static-pie.
* config.h.in (ENABLE_STATIC_PIE): New.
* configure.ac (--enable-static-pie): New configure option.
(have-no-dynamic-linker): New LIBC_CONFIG_VAR.
(have-static-pie): Likewise.
Enable static PIE if linker supports --no-dynamic-linker.
(ENABLE_STATIC_PIE): New AC_DEFINE.
(enable-static-pie): New LIBC_CONFIG_VAR.
* configure: Regenerated.
* csu/Makefile (omit-deps): Add r$(start-installed-name) and
gr$(start-installed-name) for --enable-static-pie.
(extra-objs): Likewise.
(install-lib): Likewise.
(extra-objs): Add static-reloc.o and static-reloc.os
($(objpfx)$(start-installed-name)): Also depend on
$(objpfx)static-reloc.o.
($(objpfx)r$(start-installed-name)): New.
($(objpfx)g$(start-installed-name)): Also depend on
$(objpfx)static-reloc.os.
($(objpfx)gr$(start-installed-name)): New.
* csu/libc-start.c (LIBC_START_MAIN): Call _dl_relocate_static_pie
in libc.a.
* csu/libc-tls.c (__libc_setup_tls): Add main_map->l_addr to
initimage.
* csu/static-reloc.c: New file.
* elf/Makefile (routines): Add dl-reloc-static-pie.
(elide-routines.os): Likewise.
(DEFAULT-LDFLAGS-tst-tls1-static-non-pie): Removed.
(tst-tls1-static-non-pie-no-pie): New.
* elf/dl-reloc-static-pie.c: New file.
* elf/dl-support.c (_dl_get_dl_main_map): New function.
* elf/dynamic-link.h (ELF_DURING_STARTUP): Also check
STATIC_PIE_BOOTSTRAP.
* elf/get-dynamic-info.h (elf_get_dynamic_info): Likewise.
* gmon/Makefile (tests): Add tst-gmon-static-pie.
(tests-static): Likewise.
(DEFAULT-LDFLAGS-tst-gmon-static): Removed.
(tst-gmon-static-no-pie): New.
(CFLAGS-tst-gmon-static-pie.c): Likewise.
(CRT-tst-gmon-static-pie): Likewise.
(tst-gmon-static-pie-ENV): Likewise.
(tests-special): Likewise.
($(objpfx)tst-gmon-static-pie.out): Likewise.
(clean-tst-gmon-static-pie-data): Likewise.
($(objpfx)tst-gmon-static-pie-gprof.out): Likewise.
* gmon/tst-gmon-static-pie.c: New file.
* manual/install.texi: Document --enable-static-pie.
* sysdeps/generic/ldsodefs.h (_dl_relocate_static_pie): New.
(_dl_get_dl_main_map): Likewise.
* sysdeps/i386/configure.ac: Check if linker supports static PIE.
* sysdeps/x86_64/configure.ac: Likewise.
* sysdeps/i386/configure: Regenerated.
* sysdeps/x86_64/configure: Likewise.
* sysdeps/mips/Makefile (ASFLAGS-.o): Add $(pie-default).
(ASFLAGS-.op): Likewise.
2017-12-16 00:59:33 +00:00
|
|
|
_dl_relocate_static_pie ();
|
|
|
|
|
2013-02-13 23:30:40 +00:00
|
|
|
char **ev = &argv[argc + 1];
|
2005-02-16 09:39:23 +00:00
|
|
|
|
2013-02-13 23:30:40 +00:00
|
|
|
__environ = ev;
|
2000-06-13 07:33:12 +00:00
|
|
|
|
2004-01-14 00:24:36 +00:00
|
|
|
/* Store the lowest stack address. This is done in ld.so if this is
|
|
|
|
the code for the DSO. */
|
1998-06-07 14:06:56 +00:00
|
|
|
__libc_stack_end = stack_end;
|
1998-03-18 14:42:25 +00:00
|
|
|
|
2002-07-23 23:12:01 +00:00
|
|
|
# ifdef HAVE_AUX_VECTOR
|
|
|
|
/* First process the auxiliary vector since we need to find the
|
|
|
|
program header to locate an eventually present PT_TLS entry. */
|
2003-03-15 23:09:11 +00:00
|
|
|
# ifndef LIBC_START_MAIN_AUXVEC_ARG
|
2013-02-13 23:30:40 +00:00
|
|
|
ElfW(auxv_t) *auxvec;
|
2003-03-15 23:09:11 +00:00
|
|
|
{
|
2013-02-13 23:30:40 +00:00
|
|
|
char **evp = ev;
|
2003-03-18 01:56:11 +00:00
|
|
|
while (*evp++ != NULL)
|
|
|
|
;
|
2013-02-13 23:30:40 +00:00
|
|
|
auxvec = (ElfW(auxv_t) *) evp;
|
2003-03-15 23:09:11 +00:00
|
|
|
}
|
|
|
|
# endif
|
|
|
|
_dl_aux_init (auxvec);
|
2013-03-28 23:15:48 +00:00
|
|
|
if (GL(dl_phdr) == NULL)
|
2002-07-23 23:12:01 +00:00
|
|
|
# endif
|
2013-03-28 23:15:48 +00:00
|
|
|
{
|
|
|
|
/* Starting from binutils-2.23, the linker will define the
|
|
|
|
magic symbol __ehdr_start to point to our own ELF header
|
|
|
|
if it is visible in a segment that also includes the phdrs.
|
|
|
|
So we can set up _dl_phdr and _dl_phnum even without any
|
|
|
|
information from auxv. */
|
|
|
|
|
2013-04-25 15:09:19 +00:00
|
|
|
extern const ElfW(Ehdr) __ehdr_start
|
|
|
|
__attribute__ ((weak, visibility ("hidden")));
|
2013-03-28 23:15:48 +00:00
|
|
|
if (&__ehdr_start != NULL)
|
|
|
|
{
|
|
|
|
assert (__ehdr_start.e_phentsize == sizeof *GL(dl_phdr));
|
|
|
|
GL(dl_phdr) = (const void *) &__ehdr_start + __ehdr_start.e_phoff;
|
|
|
|
GL(dl_phnum) = __ehdr_start.e_phnum;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2016-12-31 18:02:17 +00:00
|
|
|
/* Initialize very early so that tunables can use it. */
|
|
|
|
__libc_init_secure ();
|
|
|
|
|
|
|
|
__tunables_init (__environ);
|
|
|
|
|
2017-05-31 01:08:32 +00:00
|
|
|
ARCH_INIT_CPU_FEATURES ();
|
|
|
|
|
2012-08-21 22:01:27 +00:00
|
|
|
/* Perform IREL{,A} relocations. */
|
2017-07-17 20:48:59 +00:00
|
|
|
ARCH_SETUP_IREL ();
|
2009-11-24 19:17:06 +00:00
|
|
|
|
2016-12-26 09:08:34 +00:00
|
|
|
/* The stack guard goes into the TCB, so initialize it early. */
|
|
|
|
__libc_setup_tls ();
|
1999-07-09 16:18:17 +00:00
|
|
|
|
2017-07-17 20:48:59 +00:00
|
|
|
/* In some architectures, IREL{,A} relocations happen after TLS setup in
|
|
|
|
order to let IFUNC resolvers benefit from TCB information, e.g. powerpc's
|
|
|
|
hwcap and platform fields available in the TCB. */
|
|
|
|
ARCH_APPLY_IREL ();
|
|
|
|
|
2005-06-26 18:14:26 +00:00
|
|
|
/* Set up the stack checker's canary. */
|
2009-01-11 04:40:39 +00:00
|
|
|
uintptr_t stack_chk_guard = _dl_setup_stack_chk_guard (_dl_random);
|
2007-08-12 19:03:54 +00:00
|
|
|
# ifdef THREAD_SET_STACK_GUARD
|
2005-06-26 18:14:26 +00:00
|
|
|
THREAD_SET_STACK_GUARD (stack_chk_guard);
|
2007-08-12 19:03:54 +00:00
|
|
|
# else
|
2005-06-26 18:14:26 +00:00
|
|
|
__stack_chk_guard = stack_chk_guard;
|
2007-08-12 19:03:54 +00:00
|
|
|
# endif
|
2013-09-23 04:52:09 +00:00
|
|
|
|
2016-12-26 09:08:34 +00:00
|
|
|
# ifdef DL_SYSDEP_OSCHECK
|
|
|
|
if (!__libc_multiple_libcs)
|
|
|
|
{
|
|
|
|
/* This needs to run to initiliaze _dl_osversion before TLS
|
|
|
|
setup might check it. */
|
|
|
|
DL_SYSDEP_OSCHECK (__libc_fatal);
|
|
|
|
}
|
|
|
|
# endif
|
|
|
|
|
|
|
|
/* Initialize libpthread if linked in. */
|
|
|
|
if (__pthread_initialize_minimal != NULL)
|
|
|
|
__pthread_initialize_minimal ();
|
|
|
|
|
2013-09-23 04:52:09 +00:00
|
|
|
/* Set up the pointer guard value. */
|
|
|
|
uintptr_t pointer_chk_guard = _dl_setup_pointer_guard (_dl_random,
|
|
|
|
stack_chk_guard);
|
|
|
|
# ifdef THREAD_SET_POINTER_GUARD
|
|
|
|
THREAD_SET_POINTER_GUARD (pointer_chk_guard);
|
|
|
|
# else
|
|
|
|
__pointer_chk_guard_local = pointer_chk_guard;
|
|
|
|
# endif
|
|
|
|
|
2017-07-17 20:48:59 +00:00
|
|
|
#endif /* !SHARED */
|
2007-08-12 19:03:54 +00:00
|
|
|
|
1998-03-08 15:26:29 +00:00
|
|
|
/* Register the destructor of the dynamic linker if there is any. */
|
2014-02-10 13:45:42 +00:00
|
|
|
if (__glibc_likely (rtld_fini != NULL))
|
2001-02-26 17:53:15 +00:00
|
|
|
__cxa_atexit ((void (*) (void *)) rtld_fini, NULL, NULL);
|
1998-03-08 15:26:29 +00:00
|
|
|
|
2005-02-14 21:25:50 +00:00
|
|
|
#ifndef SHARED
|
2000-03-30 16:30:49 +00:00
|
|
|
/* Call the initializer of the libc. This is only needed here if we
|
|
|
|
are compiling for the static library in which case we haven't
|
|
|
|
run the constructors in `_dl_start_user'. */
|
1998-03-18 14:42:25 +00:00
|
|
|
__libc_init_first (argc, argv, __environ);
|
|
|
|
|
2005-02-14 21:25:50 +00:00
|
|
|
/* Register the destructor of the program, if any. */
|
|
|
|
if (fini)
|
|
|
|
__cxa_atexit ((void (*) (void *)) fini, NULL, NULL);
|
|
|
|
|
2003-05-06 05:55:00 +00:00
|
|
|
/* Some security at this point. Prevent starting a SUID binary where
|
|
|
|
the standard file descriptors are not opened. We have to do this
|
|
|
|
only for statically linked applications since otherwise the dynamic
|
|
|
|
loader did the work already. */
|
|
|
|
if (__builtin_expect (__libc_enable_secure, 0))
|
|
|
|
__libc_check_standard_fds ();
|
|
|
|
#endif
|
|
|
|
|
1998-04-06 19:08:46 +00:00
|
|
|
/* Call the initializer of the program, if any. */
|
2000-03-31 05:50:02 +00:00
|
|
|
#ifdef SHARED
|
2004-03-05 10:29:47 +00:00
|
|
|
if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_IMPCALLS, 0))
|
2004-03-06 08:19:29 +00:00
|
|
|
GLRO(dl_debug_printf) ("\ninitialize program: %s\n\n", argv[0]);
|
1998-03-18 14:42:25 +00:00
|
|
|
#endif
|
1998-04-06 19:08:46 +00:00
|
|
|
if (init)
|
2005-07-07 23:00:02 +00:00
|
|
|
(*init) (argc, argv, __environ MAIN_AUXVEC_PARAM);
|
1998-03-08 15:26:29 +00:00
|
|
|
|
2005-01-06 22:40:27 +00:00
|
|
|
#ifdef SHARED
|
|
|
|
/* Auditing checkpoint: we have a new object. */
|
2014-02-10 13:45:42 +00:00
|
|
|
if (__glibc_unlikely (GLRO(dl_naudit) > 0))
|
2005-01-06 22:40:27 +00:00
|
|
|
{
|
|
|
|
struct audit_ifaces *afct = GLRO(dl_audit);
|
|
|
|
struct link_map *head = GL(dl_ns)[LM_ID_BASE]._ns_loaded;
|
|
|
|
for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)
|
|
|
|
{
|
|
|
|
if (afct->preinit != NULL)
|
|
|
|
afct->preinit (&head->l_audit[cnt].cookie);
|
|
|
|
|
|
|
|
afct = afct->next;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
2000-03-31 05:50:02 +00:00
|
|
|
#ifdef SHARED
|
2014-02-10 13:45:42 +00:00
|
|
|
if (__glibc_unlikely (GLRO(dl_debug_mask) & DL_DEBUG_IMPCALLS))
|
2004-03-06 08:19:29 +00:00
|
|
|
GLRO(dl_debug_printf) ("\ntransferring control: %s\n\n", argv[0]);
|
1998-03-18 14:42:25 +00:00
|
|
|
#endif
|
|
|
|
|
2014-04-11 16:43:58 +00:00
|
|
|
#ifndef SHARED
|
|
|
|
_dl_debug_initialize (0, LM_ID_BASE);
|
|
|
|
#endif
|
2003-04-12 00:58:26 +00:00
|
|
|
#ifdef HAVE_CLEANUP_JMP_BUF
|
|
|
|
/* Memory for the cancellation buffer. */
|
|
|
|
struct pthread_unwind_buf unwind_buf;
|
|
|
|
|
|
|
|
int not_first_call;
|
|
|
|
not_first_call = setjmp ((struct __jmp_buf_tag *) unwind_buf.cancel_jmp_buf);
|
2014-02-10 13:45:42 +00:00
|
|
|
if (__glibc_likely (! not_first_call))
|
2002-09-15 02:37:32 +00:00
|
|
|
{
|
2003-04-12 00:58:26 +00:00
|
|
|
struct pthread *self = THREAD_SELF;
|
2002-09-15 02:37:32 +00:00
|
|
|
|
2003-04-12 00:58:26 +00:00
|
|
|
/* Store old info. */
|
|
|
|
unwind_buf.priv.data.prev = THREAD_GETMEM (self, cleanup_jmp_buf);
|
|
|
|
unwind_buf.priv.data.cleanup = THREAD_GETMEM (self, cleanup);
|
2003-03-15 23:09:11 +00:00
|
|
|
|
2003-04-12 00:58:26 +00:00
|
|
|
/* Store the new cleanup handler info. */
|
|
|
|
THREAD_SETMEM (self, cleanup_jmp_buf, &unwind_buf);
|
|
|
|
|
|
|
|
/* Run the program. */
|
|
|
|
result = main (argc, argv, __environ MAIN_AUXVEC_PARAM);
|
2002-09-15 02:37:32 +00:00
|
|
|
}
|
|
|
|
else
|
2003-02-14 23:31:11 +00:00
|
|
|
{
|
2004-03-31 01:47:34 +00:00
|
|
|
/* Remove the thread-local data. */
|
|
|
|
# ifdef SHARED
|
2007-01-17 08:37:26 +00:00
|
|
|
PTHFCT_CALL (ptr__nptl_deallocate_tsd, ());
|
2004-03-31 01:47:34 +00:00
|
|
|
# else
|
|
|
|
extern void __nptl_deallocate_tsd (void) __attribute ((weak));
|
|
|
|
__nptl_deallocate_tsd ();
|
|
|
|
# endif
|
|
|
|
|
2003-02-14 23:31:11 +00:00
|
|
|
/* One less thread. Decrement the counter. If it is zero we
|
|
|
|
terminate the entire process. */
|
|
|
|
result = 0;
|
2003-04-12 00:58:26 +00:00
|
|
|
# ifdef SHARED
|
2007-01-17 08:37:26 +00:00
|
|
|
unsigned int *ptr = __libc_pthread_functions.ptr_nthreads;
|
2012-11-04 20:46:30 +00:00
|
|
|
# ifdef PTR_DEMANGLE
|
2007-01-17 08:37:26 +00:00
|
|
|
PTR_DEMANGLE (ptr);
|
2012-11-04 20:46:30 +00:00
|
|
|
# endif
|
2003-04-12 00:58:26 +00:00
|
|
|
# else
|
[BZ #284, BZ #721]
* intl/dcigettext.c (_nl_find_msg): Add a cast.
* nis/nis_clone_dir.c (nis_clone_directory): Use char * for ADDR.
* nis/nis_clone_obj.c (nis_clone_object): Likewise.
* nis/nis_clone_res.c (nis_clone_result): Likewise.
* resolv/nss_dns/dns-network.c (getanswer_r): Use const unsigned char *
for END_OF_MESSAGE and CP.
* resolv/res_send.c (send_dg): Add else branch for case impossible
unless `poll' is buggy.
* crypt/crypt_util.c (__setkey_r): Add a cast.
* locale/programs/linereader.c (get_toplvl_escape): Use size_t for
NBYTES, and unsigned char * for BYTES.
* locale/programs/charmap.c (charmap_new_char): Use size_t and
unsighed char * for NBYTES, BYTES parameters.
* sysdeps/generic/dl-hash.h (_dl_elf_hash): Take const char * argument
and cast it.
* sysdeps/i386/i686/dl-hash.h (_dl_elf_hash): Likewise.
* sunrpc/create_xid.c (_create_xid): Don't use unsigned long for RES.
* sunrpc/svcauth_des.c (_svcauth_des): Fix cast type.
* sunrpc/auth_des.c (authdes_create): Don't use u_char for PKEY_DATA.
(authdes_marshal): Don't use unsigned int for LEN.
* sunrpc/xdr.c (xdr_hyper): Don't use unsigned long for T2.
(xdr_u_hyper): Likewise.
(xdr_u_short): Don't use u_long for L.
* sunrpc/xdr_intXX_t.c (xdr_int64_t): Don't use uint32_t for T2.
* inet/rexec.c (rexec_af): Use socklen_t.
* sunrpc/key_call.c (getkeyserv_handle): Likewise.
* sunrpc/rtime.c (rtime): Likewise.
* resolv/res_send.c (send_vc, send_dg): Likewise.
* nis/nis_callback.c (__nis_create_callback): Likewise.
* sysdeps/generic/libc-start.c: Use unsigned int for nthreads ptr.
* sysdeps/posix/getaddrinfo.c (gaih_inet): Fix type of ADDR local.
* libio/libio.h (_IO_BE): Add parenthesis around EXPR.
* intl/dcigettext.c (INTVARDEF, INTUSE): Macros removed.
(_nl_default_dirname): Use libc_hidden_data_def instead of INTVARDEF.
(libc_freeres_fn, DCIGETTEXT): Don't use INTUSE.
* intl/bindtextdom.c (INTUSE): Macro removed.
(_nl_default_dirname): Use libc_hidden_proto.
(set_binding_values): Don't use INTUSE.
* include/libintl.h (_libc_intl_domainname_internal): Decl removed.
(_libc_intl_domainname): Use libc_hidden_proto.
* posix/regex_internal.h (gettext): Remove INTUSE on it.
* locale/SYS_libc.c (_libc_intl_domainname): Use libc_hidden_data_def
rather than INTDEF.
* include/libintl.h (_): Don't use *_internal name.
* ctype/ctype-extn.c (__ctype_tolower, __ctype_toupper): Use int32_t,
not uint32_t.
* locale/lc-ctype.c (_nl_postload_ctype): Likewise for assignments.
* iconv/gconv_open.c (__gconv_open): Remove useless cast.
[BZ #721]
* sysdeps/i386/dl-machine.h (ELF_MACHINE_NO_RELA): Define this outside
of [RESOLVE_MAP].
* sysdeps/sh/dl-machine.h (ELF_MACHINE_NO_REL): Likewise.
* sysdeps/powerpc/powerpc32/dl-machine.h
(elf_machine_rel, elf_machine_rel_relative): Removed.
* sysdeps/powerpc/powerpc64/dl-machine.h
(elf_machine_rel, elf_machine_rel_relative): Removed.
2005-02-03 Alexandre Oliva <aoliva@redhat.com>
[BZ #721]
* elf/dynamic-link.h: Don't declare nested auto functions that are
not going to be defined.
2004-07-23 Jakub Jelinek <jakub@redhat.com>
[BZ #284]
* include/features.h (_POSIX_SOURCE, _POSIX_C_SOURCE): Define
if _XOPEN_SOURCE >= 500 even if __STRICT_ANSI__ is defined.
2005-02-16 Roland McGrath <roland@redhat.com>
2005-02-17 01:19:55 +00:00
|
|
|
extern unsigned int __nptl_nthreads __attribute ((weak));
|
|
|
|
unsigned int *const ptr = &__nptl_nthreads;
|
2003-04-12 00:58:26 +00:00
|
|
|
# endif
|
2003-02-14 23:31:11 +00:00
|
|
|
|
|
|
|
if (! atomic_decrement_and_test (ptr))
|
|
|
|
/* Not much left to do but to exit the thread, not the process. */
|
2014-05-13 16:49:20 +00:00
|
|
|
__exit_thread ();
|
2003-02-14 23:31:11 +00:00
|
|
|
}
|
2003-04-12 00:58:26 +00:00
|
|
|
#else
|
|
|
|
/* Nothing fancy, just call the function. */
|
|
|
|
result = main (argc, argv, __environ MAIN_AUXVEC_PARAM);
|
2002-09-15 02:37:32 +00:00
|
|
|
#endif
|
|
|
|
|
|
|
|
exit (result);
|
1998-03-06 17:21:43 +00:00
|
|
|
}
|