539 lines
20 KiB
Diff
539 lines
20 KiB
Diff
commit ec935dea6332cb22f9881cd1162bad156173f4b0
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Author: Florian Weimer <fweimer@redhat.com>
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Date: Fri Apr 24 22:31:15 2020 +0200
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elf: Implement __libc_early_init
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This function is defined in libc.so, and the dynamic loader calls
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right after relocation has been finished, before any ELF constructors
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or the preinit function is invoked. It is also used in the static
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build for initializing parts of the static libc.
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To locate __libc_early_init, a direct symbol lookup function is used,
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_dl_lookup_direct. It does not search the entire symbol scope and
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consults merely a single link map. This function could also be used
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to implement lookups in the vDSO (as an optimization).
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A per-namespace variable (libc_map) is added for locating libc.so,
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to avoid repeated traversals of the search scope. It is similar to
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GL(dl_initfirst). An alternative would have been to thread a context
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argument from _dl_open down to _dl_map_object_from_fd (where libc.so
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is identified). This could have avoided the global variable, but
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the change would be larger as a result. It would not have been
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possible to use this to replace GL(dl_initfirst) because that global
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variable is used to pass the function pointer past the stack switch
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from dl_main to the main program. Replacing that requires adding
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a new argument to _dl_init, which in turn needs changes to the
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architecture-specific libc.so startup code written in assembler.
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__libc_early_init should not be used to replace _dl_var_init (as
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it exists today on some architectures). Instead, _dl_lookup_direct
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should be used to look up a new variable symbol in libc.so, and
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that should then be initialized from the dynamic loader, immediately
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after the object has been loaded in _dl_map_object_from_fd (before
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relocation is run). This way, more IFUNC resolvers which depend on
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these variables will work.
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Reviewed-by: Carlos O'Donell <carlos@redhat.com>
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diff --git a/csu/init-first.c b/csu/init-first.c
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index 289373f9d8bd98f4..544229151ef79c67 100644
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--- a/csu/init-first.c
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+++ b/csu/init-first.c
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@@ -16,7 +16,6 @@
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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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-#include <ctype.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <fcntl.h>
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@@ -80,9 +79,6 @@ _init (int argc, char **argv, char **envp)
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__init_misc (argc, argv, envp);
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- /* Initialize ctype data. */
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- __ctype_init ();
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-
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#if defined SHARED && !defined NO_CTORS_DTORS_SECTIONS
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__libc_global_ctors ();
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#endif
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diff --git a/csu/libc-start.c b/csu/libc-start.c
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index dfbf195328239a17..d9c3248219d8f84f 100644
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--- a/csu/libc-start.c
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+++ b/csu/libc-start.c
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@@ -22,6 +22,7 @@
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#include <ldsodefs.h>
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#include <exit-thread.h>
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#include <libc-internal.h>
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+#include <elf/libc-early-init.h>
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#include <elf/dl-tunables.h>
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@@ -238,6 +239,10 @@ LIBC_START_MAIN (int (*main) (int, char **, char ** MAIN_AUXVEC_DECL),
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__cxa_atexit ((void (*) (void *)) rtld_fini, NULL, NULL);
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#ifndef SHARED
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+ /* Perform early initialization. In the shared case, this function
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+ is called from the dynamic loader as early as possible. */
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+ __libc_early_init ();
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+
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/* Call the initializer of the libc. This is only needed here if we
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are compiling for the static library in which case we haven't
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run the constructors in `_dl_start_user'. */
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diff --git a/elf/Makefile b/elf/Makefile
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index a6601ba84c8f4017..cbced7605ebe2443 100644
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--- a/elf/Makefile
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+++ b/elf/Makefile
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@@ -25,7 +25,7 @@ headers = elf.h bits/elfclass.h link.h bits/link.h
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routines = $(all-dl-routines) dl-support dl-iteratephdr \
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dl-addr dl-addr-obj enbl-secure dl-profstub \
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dl-origin dl-libc dl-sym dl-sysdep dl-error \
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- dl-reloc-static-pie
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+ dl-reloc-static-pie libc_early_init
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# The core dynamic linking functions are in libc for the static and
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# profiled libraries.
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@@ -33,7 +33,8 @@ dl-routines = $(addprefix dl-,load lookup object reloc deps hwcaps \
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runtime init fini debug misc \
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version profile tls origin scope \
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execstack open close trampoline \
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- exception sort-maps)
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+ exception sort-maps lookup-direct \
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+ call-libc-early-init)
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ifeq (yes,$(use-ldconfig))
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dl-routines += dl-cache
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endif
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diff --git a/elf/Versions b/elf/Versions
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index 705489fc51f4ac5f..3be879c4adfa74c7 100644
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--- a/elf/Versions
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+++ b/elf/Versions
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@@ -26,6 +26,7 @@ libc {
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_dl_open_hook; _dl_open_hook2;
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_dl_sym; _dl_vsym;
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__libc_dlclose; __libc_dlopen_mode; __libc_dlsym; __libc_dlvsym;
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+ __libc_early_init;
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# Internal error handling support. Interposes the functions in ld.so.
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_dl_signal_exception; _dl_catch_exception;
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diff --git a/elf/dl-call-libc-early-init.c b/elf/dl-call-libc-early-init.c
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new file mode 100644
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index 0000000000000000..41e9ad9aad8b5b46
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--- /dev/null
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+++ b/elf/dl-call-libc-early-init.c
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@@ -0,0 +1,41 @@
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+/* Invoke the early initialization function in libc.so.
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+ Copyright (C) 2020 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+
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+ The GNU C Library is free software; you can redistribute it and/or
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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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+
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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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+ Lesser General Public License for more details.
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+
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+ You should have received a copy of the GNU Lesser General Public
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+ License along with the GNU C Library; if not, see
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+ <https://www.gnu.org/licenses/>. */
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+
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+#include <assert.h>
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+#include <ldsodefs.h>
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+#include <libc-early-init.h>
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+#include <link.h>
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+#include <stddef.h>
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+
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+void
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+_dl_call_libc_early_init (struct link_map *libc_map)
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+{
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+ /* There is nothing to do if we did not actually load libc.so. */
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+ if (libc_map == NULL)
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+ return;
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+
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+ const ElfW(Sym) *sym
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+ = _dl_lookup_direct (libc_map, "__libc_early_init",
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+ 0x069682ac, /* dl_new_hash output. */
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+ "GLIBC_PRIVATE",
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+ 0x0963cf85); /* _dl_elf_hash output. */
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+ assert (sym != NULL);
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+ __typeof (__libc_early_init) *early_init
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+ = DL_SYMBOL_ADDRESS (libc_map, sym);
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+ early_init ();
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+}
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diff --git a/elf/dl-load.c b/elf/dl-load.c
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index 8f8869ff524ab9f2..64da5323d0e368c1 100644
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--- a/elf/dl-load.c
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+++ b/elf/dl-load.c
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@@ -30,6 +30,7 @@
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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+#include <gnu/lib-names.h>
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/* Type for the buffer we put the ELF header and hopefully the program
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header. This buffer does not really have to be too large. In most
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@@ -1390,6 +1391,14 @@ cannot enable executable stack as shared object requires");
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add_name_to_object (l, ((const char *) D_PTR (l, l_info[DT_STRTAB])
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+ l->l_info[DT_SONAME]->d_un.d_val));
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+ /* If we have newly loaded libc.so, update the namespace
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+ description. */
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+ if (GL(dl_ns)[nsid].libc_map == NULL
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+ && l->l_info[DT_SONAME] != NULL
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+ && strcmp (((const char *) D_PTR (l, l_info[DT_STRTAB])
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+ + l->l_info[DT_SONAME]->d_un.d_val), LIBC_SO) == 0)
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+ GL(dl_ns)[nsid].libc_map = l;
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+
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/* _dl_close can only eventually undo the module ID assignment (via
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remove_slotinfo) if this function returns a pointer to a link
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map. Therefore, delay this step until all possibilities for
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diff --git a/elf/dl-lookup-direct.c b/elf/dl-lookup-direct.c
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new file mode 100644
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index 0000000000000000..5637ae89de8a9d61
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--- /dev/null
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+++ b/elf/dl-lookup-direct.c
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@@ -0,0 +1,116 @@
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+/* Look up a symbol in a single specified object.
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+ Copyright (C) 1995-2020 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+
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+ The GNU C Library is free software; you can redistribute it and/or
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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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+
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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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+ Lesser General Public License for more details.
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+
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+ You should have received a copy of the GNU Lesser General Public
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+ License along with the GNU C Library; if not, see
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+ <https://www.gnu.org/licenses/>. */
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+
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+#include <ldsodefs.h>
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+#include <string.h>
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+#include <elf_machine_sym_no_match.h>
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+#include <dl-hash.h>
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+
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+/* This function corresponds to do_lookup_x in elf/dl-lookup.c. The
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+ variant here is simplified because it requires symbol
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+ versioning. */
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+static const ElfW(Sym) *
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+check_match (const struct link_map *const map, const char *const undef_name,
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+ const char *version, uint32_t version_hash,
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+ const Elf_Symndx symidx)
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+{
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+ const ElfW(Sym) *symtab = (const void *) D_PTR (map, l_info[DT_SYMTAB]);
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+ const ElfW(Sym) *sym = &symtab[symidx];
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+
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+ unsigned int stt = ELFW(ST_TYPE) (sym->st_info);
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+ if (__glibc_unlikely ((sym->st_value == 0 /* No value. */
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+ && sym->st_shndx != SHN_ABS
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+ && stt != STT_TLS)
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+ || elf_machine_sym_no_match (sym)))
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+ return NULL;
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+
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+ /* Ignore all but STT_NOTYPE, STT_OBJECT, STT_FUNC,
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+ STT_COMMON, STT_TLS, and STT_GNU_IFUNC since these are no
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+ code/data definitions. */
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+#define ALLOWED_STT \
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+ ((1 << STT_NOTYPE) | (1 << STT_OBJECT) | (1 << STT_FUNC) \
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+ | (1 << STT_COMMON) | (1 << STT_TLS) | (1 << STT_GNU_IFUNC))
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+ if (__glibc_unlikely (((1 << stt) & ALLOWED_STT) == 0))
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+ return NULL;
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+
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+ const char *strtab = (const void *) D_PTR (map, l_info[DT_STRTAB]);
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+
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+ if (strcmp (strtab + sym->st_name, undef_name) != 0)
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+ /* Not the symbol we are looking for. */
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+ return NULL;
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+
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+ ElfW(Half) ndx = map->l_versyms[symidx] & 0x7fff;
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+ if (map->l_versions[ndx].hash != version_hash
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+ || strcmp (map->l_versions[ndx].name, version) != 0)
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+ /* It's not the version we want. */
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+ return NULL;
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+
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+ return sym;
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+}
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+
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+
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+/* This function corresponds to do_lookup_x in elf/dl-lookup.c. The
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+ variant here is simplified because it does not search object
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+ dependencies. It is optimized for a successful lookup. */
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+const ElfW(Sym) *
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+_dl_lookup_direct (struct link_map *map,
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+ const char *undef_name, uint32_t new_hash,
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+ const char *version, uint32_t version_hash)
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+{
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+ const ElfW(Addr) *bitmask = map->l_gnu_bitmask;
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+ if (__glibc_likely (bitmask != NULL))
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+ {
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+ Elf32_Word bucket = map->l_gnu_buckets[new_hash % map->l_nbuckets];
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+ if (bucket != 0)
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+ {
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+ const Elf32_Word *hasharr = &map->l_gnu_chain_zero[bucket];
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+
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+ do
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+ if (((*hasharr ^ new_hash) >> 1) == 0)
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+ {
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+ Elf_Symndx symidx = ELF_MACHINE_HASH_SYMIDX (map, hasharr);
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+ const ElfW(Sym) *sym = check_match (map, undef_name,
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+ version, version_hash,
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+ symidx);
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+ if (sym != NULL)
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+ return sym;
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+ }
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+ while ((*hasharr++ & 1u) == 0);
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+ }
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+ }
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+ else
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+ {
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+ /* Fallback code for lack of GNU_HASH support. */
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+ uint32_t old_hash = _dl_elf_hash (undef_name);
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+
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+ /* Use the old SysV-style hash table. Search the appropriate
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+ hash bucket in this object's symbol table for a definition
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+ for the same symbol name. */
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+ for (Elf_Symndx symidx = map->l_buckets[old_hash % map->l_nbuckets];
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+ symidx != STN_UNDEF;
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+ symidx = map->l_chain[symidx])
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+ {
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+ const ElfW(Sym) *sym = check_match (map, undef_name,
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+ version, version_hash, symidx);
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+ if (sym != NULL)
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+ return sym;
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+ }
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+ }
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+
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+ return NULL;
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+}
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diff --git a/elf/dl-open.c b/elf/dl-open.c
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index 7113c4a04f0fddbc..1a77ec833cad6c55 100644
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--- a/elf/dl-open.c
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+++ b/elf/dl-open.c
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@@ -34,6 +34,7 @@
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#include <atomic.h>
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#include <libc-internal.h>
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#include <array_length.h>
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+#include <libc-early-init.h>
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#include <dl-dst.h>
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#include <dl-prop.h>
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@@ -57,6 +58,13 @@ struct dl_open_args
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(non-negative). */
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unsigned int original_global_scope_pending_adds;
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+ /* Set to true by dl_open_worker if libc.so was already loaded into
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+ the namespace at the time dl_open_worker was called. This is
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+ used to determine whether libc.so early initialization has
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+ already been done before, and whether to roll back the cached
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+ libc_map value in the namespace in case of a dlopen failure. */
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+ bool libc_already_loaded;
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+
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/* Original parameters to the program and the current environment. */
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int argc;
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char **argv;
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@@ -500,6 +508,11 @@ dl_open_worker (void *a)
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args->nsid = call_map->l_ns;
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}
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+ /* The namespace ID is now known. Keep track of whether libc.so was
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+ already loaded, to determine whether it is necessary to call the
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+ early initialization routine (or clear libc_map on error). */
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+ args->libc_already_loaded = GL(dl_ns)[args->nsid].libc_map != NULL;
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+
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/* Retain the old value, so that it can be restored. */
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args->original_global_scope_pending_adds
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= GL (dl_ns)[args->nsid]._ns_global_scope_pending_adds;
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@@ -734,6 +747,11 @@ dl_open_worker (void *a)
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if (relocation_in_progress)
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LIBC_PROBE (reloc_complete, 3, args->nsid, r, new);
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|
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+ /* If libc.so was not there before, attempt to call its early
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+ initialization routine. */
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+ if (!args->libc_already_loaded)
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+ _dl_call_libc_early_init (GL(dl_ns)[args->nsid].libc_map);
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+
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#ifndef SHARED
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DL_STATIC_INIT (new);
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#endif
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@@ -828,6 +846,8 @@ no more namespaces available for dlmopen()"));
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args.caller_dlopen = caller_dlopen;
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args.map = NULL;
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args.nsid = nsid;
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+ /* args.libc_already_loaded is always assigned by dl_open_worker
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+ (before any explicit/non-local returns). */
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args.argc = argc;
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args.argv = argv;
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args.env = env;
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@@ -856,6 +876,11 @@ no more namespaces available for dlmopen()"));
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/* See if an error occurred during loading. */
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if (__glibc_unlikely (exception.errstring != NULL))
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{
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+ /* Avoid keeping around a dangling reference to the libc.so link
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+ map in case it has been cached in libc_map. */
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+ if (!args.libc_already_loaded)
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+ GL(dl_ns)[nsid].libc_map = NULL;
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+
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/* Remove the object from memory. It may be in an inconsistent
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state if relocation failed, for example. */
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if (args.map)
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diff --git a/elf/libc-early-init.h b/elf/libc-early-init.h
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new file mode 100644
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index 0000000000000000..5185fa8895c0e11a
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--- /dev/null
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+++ b/elf/libc-early-init.h
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@@ -0,0 +1,35 @@
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+/* Early initialization of libc.so.
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+ Copyright (C) 2020 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+
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+ The GNU C Library is free software; you can redistribute it and/or
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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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+
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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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|
+ Lesser General Public License for more details.
|
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+
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+ You should have received a copy of the GNU Lesser General Public
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+ License along with the GNU C Library; if not, see
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+ <https://www.gnu.org/licenses/>. */
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+
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+#ifndef _LIBC_EARLY_INIT_H
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+#define _LIBC_EARLY_INIT_H
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+
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+struct link_map;
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+
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+/* If LIBC_MAP is not NULL, look up the __libc_early_init symbol in it
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+ and call this function. */
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+void _dl_call_libc_early_init (struct link_map *libc_map) attribute_hidden;
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+
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+/* In the shared case, this function is defined in libc.so and invoked
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+ from ld.so (or on the fist static dlopen) after complete relocation
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+ of a new loaded libc.so, but before user-defined ELF constructors
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+ run. In the static case, this function is called directly from the
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+ startup code. */
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+void __libc_early_init (void);
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|
+
|
|
+#endif /* _LIBC_EARLY_INIT_H */
|
|
diff --git a/elf/libc_early_init.c b/elf/libc_early_init.c
|
|
new file mode 100644
|
|
index 0000000000000000..7f4ca332b805a22c
|
|
--- /dev/null
|
|
+++ b/elf/libc_early_init.c
|
|
@@ -0,0 +1,27 @@
|
|
+/* Early initialization of libc.so, libc.so side.
|
|
+ Copyright (C) 2020 Free Software Foundation, Inc.
|
|
+ This file is part of the GNU C Library.
|
|
+
|
|
+ The GNU C Library is free software; you can redistribute it and/or
|
|
+ modify it under the terms of the GNU Lesser General Public
|
|
+ License as published by the Free Software Foundation; either
|
|
+ version 2.1 of the License, or (at your option) any later version.
|
|
+
|
|
+ The GNU C Library is distributed in the hope that it will be useful,
|
|
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
+ Lesser General Public License for more details.
|
|
+
|
|
+ You should have received a copy of the GNU Lesser General Public
|
|
+ License along with the GNU C Library; if not, see
|
|
+ <https://www.gnu.org/licenses/>. */
|
|
+
|
|
+#include <ctype.h>
|
|
+#include <libc-early-init.h>
|
|
+
|
|
+void
|
|
+__libc_early_init (void)
|
|
+{
|
|
+ /* Initialize ctype data. */
|
|
+ __ctype_init ();
|
|
+}
|
|
diff --git a/elf/rtld.c b/elf/rtld.c
|
|
index d44facf5343b3301..a40d5f17db0dac8b 100644
|
|
--- a/elf/rtld.c
|
|
+++ b/elf/rtld.c
|
|
@@ -44,6 +44,7 @@
|
|
#include <stackinfo.h>
|
|
#include <not-cancel.h>
|
|
#include <array_length.h>
|
|
+#include <libc-early-init.h>
|
|
|
|
#include <assert.h>
|
|
|
|
@@ -2365,6 +2366,9 @@ ERROR: '%s': cannot process note segment.\n", _dl_argv[0]);
|
|
rtld_timer_accum (&relocate_time, start);
|
|
}
|
|
|
|
+ /* Relocation is complete. Perform early libc initialization. */
|
|
+ _dl_call_libc_early_init (GL(dl_ns)[LM_ID_BASE].libc_map);
|
|
+
|
|
/* Do any necessary cleanups for the startup OS interface code.
|
|
We do these now so that no calls are made after rtld re-relocation
|
|
which might be resolved to different functions than we expect.
|
|
diff --git a/sysdeps/generic/ldsodefs.h b/sysdeps/generic/ldsodefs.h
|
|
index a8fb0d211426e4b1..ccec08929e4ad4e7 100644
|
|
--- a/sysdeps/generic/ldsodefs.h
|
|
+++ b/sysdeps/generic/ldsodefs.h
|
|
@@ -336,6 +336,10 @@ struct rtld_global
|
|
recursive dlopen calls from ELF constructors. */
|
|
unsigned int _ns_global_scope_pending_adds;
|
|
|
|
+ /* Once libc.so has been loaded into the namespace, this points to
|
|
+ its link map. */
|
|
+ struct link_map *libc_map;
|
|
+
|
|
/* Search table for unique objects. */
|
|
struct unique_sym_table
|
|
{
|
|
@@ -943,6 +947,19 @@ extern lookup_t _dl_lookup_symbol_x (const char *undef,
|
|
attribute_hidden;
|
|
|
|
|
|
+/* Restricted version of _dl_lookup_symbol_x. Searches MAP (and only
|
|
+ MAP) for the symbol UNDEF_NAME, with GNU hash NEW_HASH (computed
|
|
+ with dl_new_hash), symbol version VERSION, and symbol version hash
|
|
+ VERSION_HASH (computed with _dl_elf_hash). Returns a pointer to
|
|
+ the symbol table entry in MAP on success, or NULL on failure. MAP
|
|
+ must have symbol versioning information, or otherwise the result is
|
|
+ undefined. */
|
|
+const ElfW(Sym) *_dl_lookup_direct (struct link_map *map,
|
|
+ const char *undef_name,
|
|
+ uint32_t new_hash,
|
|
+ const char *version,
|
|
+ uint32_t version_hash) attribute_hidden;
|
|
+
|
|
/* Add the new link_map NEW to the end of the namespace list. */
|
|
extern void _dl_add_to_namespace_list (struct link_map *new, Lmid_t nsid)
|
|
attribute_hidden;
|
|
diff --git a/sysdeps/mach/hurd/i386/init-first.c b/sysdeps/mach/hurd/i386/init-first.c
|
|
index f8ad2ceb8e324f92..1636a40ee5d78858 100644
|
|
--- a/sysdeps/mach/hurd/i386/init-first.c
|
|
+++ b/sysdeps/mach/hurd/i386/init-first.c
|
|
@@ -17,7 +17,6 @@
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <assert.h>
|
|
-#include <ctype.h>
|
|
#include <hurd.h>
|
|
#include <stdio.h>
|
|
#include <unistd.h>
|
|
@@ -84,9 +83,6 @@ posixland_init (int argc, char **argv, char **envp)
|
|
#endif
|
|
__init_misc (argc, argv, envp);
|
|
|
|
- /* Initialize ctype data. */
|
|
- __ctype_init ();
|
|
-
|
|
#if defined SHARED && !defined NO_CTORS_DTORS_SECTIONS
|
|
__libc_global_ctors ();
|
|
#endif
|