1864 lines
48 KiB
C
1864 lines
48 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 1998-2000 Doug Rabson
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* Copyright (c) 2004 Peter Wemm
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_ddb.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/fcntl.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/linker.h>
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#include <sys/mutex.h>
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#include <sys/mount.h>
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#include <sys/namei.h>
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#include <sys/proc.h>
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#include <sys/rwlock.h>
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#include <sys/sysctl.h>
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#include <sys/vnode.h>
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#include <machine/elf.h>
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#include <net/vnet.h>
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#include <security/mac/mac_framework.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <vm/pmap.h>
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#include <vm/vm_extern.h>
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#include <vm/vm_kern.h>
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#include <vm/vm_map.h>
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#include <vm/vm_object.h>
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#include <vm/vm_page.h>
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#include <vm/vm_pager.h>
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#include <sys/link_elf.h>
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#ifdef DDB_CTF
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#include <contrib/zlib/zlib.h>
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#endif
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#include "linker_if.h"
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typedef struct {
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void *addr;
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Elf_Off size;
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int flags; /* Section flags. */
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int sec; /* Original section number. */
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char *name;
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} Elf_progent;
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typedef struct {
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Elf_Rel *rel;
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int nrel;
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int sec;
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} Elf_relent;
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typedef struct {
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Elf_Rela *rela;
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int nrela;
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int sec;
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} Elf_relaent;
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typedef struct elf_file {
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struct linker_file lf; /* Common fields */
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int preloaded;
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caddr_t address; /* Relocation address */
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vm_object_t object; /* VM object to hold file pages */
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Elf_Shdr *e_shdr;
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Elf_progent *progtab;
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u_int nprogtab;
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Elf_relaent *relatab;
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u_int nrelatab;
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Elf_relent *reltab;
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int nreltab;
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Elf_Sym *ddbsymtab; /* The symbol table we are using */
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long ddbsymcnt; /* Number of symbols */
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caddr_t ddbstrtab; /* String table */
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long ddbstrcnt; /* number of bytes in string table */
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caddr_t shstrtab; /* Section name string table */
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long shstrcnt; /* number of bytes in string table */
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caddr_t ctftab; /* CTF table */
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long ctfcnt; /* number of bytes in CTF table */
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caddr_t ctfoff; /* CTF offset table */
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caddr_t typoff; /* Type offset table */
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long typlen; /* Number of type entries. */
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} *elf_file_t;
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#include <kern/kern_ctf.c>
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static int link_elf_link_preload(linker_class_t cls,
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const char *, linker_file_t *);
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static int link_elf_link_preload_finish(linker_file_t);
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static int link_elf_load_file(linker_class_t, const char *, linker_file_t *);
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static int link_elf_lookup_symbol(linker_file_t, const char *,
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c_linker_sym_t *);
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static int link_elf_lookup_debug_symbol(linker_file_t, const char *,
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c_linker_sym_t *);
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static int link_elf_symbol_values(linker_file_t, c_linker_sym_t,
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linker_symval_t *);
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static int link_elf_debug_symbol_values(linker_file_t, c_linker_sym_t,
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linker_symval_t *);
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static int link_elf_search_symbol(linker_file_t, caddr_t value,
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c_linker_sym_t *sym, long *diffp);
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static void link_elf_unload_file(linker_file_t);
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static int link_elf_lookup_set(linker_file_t, const char *,
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void ***, void ***, int *);
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static int link_elf_each_function_name(linker_file_t,
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int (*)(const char *, void *), void *);
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static int link_elf_each_function_nameval(linker_file_t,
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linker_function_nameval_callback_t,
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void *);
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static int link_elf_reloc_local(linker_file_t, bool);
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static long link_elf_symtab_get(linker_file_t, const Elf_Sym **);
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static long link_elf_strtab_get(linker_file_t, caddr_t *);
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static int elf_obj_lookup(linker_file_t lf, Elf_Size symidx, int deps,
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Elf_Addr *);
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static kobj_method_t link_elf_methods[] = {
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KOBJMETHOD(linker_lookup_symbol, link_elf_lookup_symbol),
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KOBJMETHOD(linker_lookup_debug_symbol, link_elf_lookup_debug_symbol),
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KOBJMETHOD(linker_symbol_values, link_elf_symbol_values),
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KOBJMETHOD(linker_debug_symbol_values, link_elf_debug_symbol_values),
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KOBJMETHOD(linker_search_symbol, link_elf_search_symbol),
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KOBJMETHOD(linker_unload, link_elf_unload_file),
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KOBJMETHOD(linker_load_file, link_elf_load_file),
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KOBJMETHOD(linker_link_preload, link_elf_link_preload),
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KOBJMETHOD(linker_link_preload_finish, link_elf_link_preload_finish),
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KOBJMETHOD(linker_lookup_set, link_elf_lookup_set),
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KOBJMETHOD(linker_each_function_name, link_elf_each_function_name),
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KOBJMETHOD(linker_each_function_nameval, link_elf_each_function_nameval),
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KOBJMETHOD(linker_ctf_get, link_elf_ctf_get),
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KOBJMETHOD(linker_symtab_get, link_elf_symtab_get),
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KOBJMETHOD(linker_strtab_get, link_elf_strtab_get),
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KOBJMETHOD_END
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};
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static struct linker_class link_elf_class = {
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#if ELF_TARG_CLASS == ELFCLASS32
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"elf32_obj",
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#else
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"elf64_obj",
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#endif
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link_elf_methods, sizeof(struct elf_file)
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};
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static bool link_elf_obj_leak_locals = true;
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SYSCTL_BOOL(_debug, OID_AUTO, link_elf_obj_leak_locals,
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CTLFLAG_RWTUN, &link_elf_obj_leak_locals, 0,
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"Allow local symbols to participate in global module symbol resolution");
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static int relocate_file(elf_file_t ef);
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static void elf_obj_cleanup_globals_cache(elf_file_t);
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static void
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link_elf_error(const char *filename, const char *s)
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{
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if (filename == NULL)
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printf("kldload: %s\n", s);
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else
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printf("kldload: %s: %s\n", filename, s);
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}
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static void
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link_elf_init(void *arg)
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{
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linker_add_class(&link_elf_class);
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}
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SYSINIT(link_elf_obj, SI_SUB_KLD, SI_ORDER_SECOND, link_elf_init, NULL);
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static void
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link_elf_protect_range(elf_file_t ef, vm_offset_t start, vm_offset_t end,
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vm_prot_t prot)
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{
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int error __unused;
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KASSERT(start <= end && start >= (vm_offset_t)ef->address &&
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end <= round_page((vm_offset_t)ef->address + ef->lf.size),
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("link_elf_protect_range: invalid range %#jx-%#jx",
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(uintmax_t)start, (uintmax_t)end));
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if (start == end)
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return;
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if (ef->preloaded) {
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#ifdef __amd64__
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error = pmap_change_prot(start, end - start, prot);
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KASSERT(error == 0,
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("link_elf_protect_range: pmap_change_prot() returned %d",
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error));
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#endif
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return;
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}
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error = vm_map_protect(kernel_map, start, end, prot, 0,
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VM_MAP_PROTECT_SET_PROT);
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KASSERT(error == KERN_SUCCESS,
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("link_elf_protect_range: vm_map_protect() returned %d", error));
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}
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/*
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* Restrict permissions on linker file memory based on section flags.
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* Sections need not be page-aligned, so overlap within a page is possible.
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*/
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static void
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link_elf_protect(elf_file_t ef)
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{
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vm_offset_t end, segend, segstart, start;
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vm_prot_t gapprot, prot, segprot;
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int i;
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/*
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* If the file was preloaded, the last page may contain other preloaded
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* data which may need to be writeable. ELF files are always
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* page-aligned, but other preloaded data, such as entropy or CPU
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* microcode may be loaded with a smaller alignment.
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*/
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gapprot = ef->preloaded ? VM_PROT_RW : VM_PROT_READ;
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start = end = (vm_offset_t)ef->address;
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prot = VM_PROT_READ;
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for (i = 0; i < ef->nprogtab; i++) {
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/*
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* VNET and DPCPU sections have their memory allocated by their
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* respective subsystems.
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*/
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if (ef->progtab[i].name != NULL && (
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#ifdef VIMAGE
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strcmp(ef->progtab[i].name, VNET_SETNAME) == 0 ||
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#endif
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strcmp(ef->progtab[i].name, DPCPU_SETNAME) == 0))
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continue;
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segstart = trunc_page((vm_offset_t)ef->progtab[i].addr);
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segend = round_page((vm_offset_t)ef->progtab[i].addr +
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ef->progtab[i].size);
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segprot = VM_PROT_READ;
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if ((ef->progtab[i].flags & SHF_WRITE) != 0)
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segprot |= VM_PROT_WRITE;
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if ((ef->progtab[i].flags & SHF_EXECINSTR) != 0)
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segprot |= VM_PROT_EXECUTE;
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if (end <= segstart) {
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/*
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* Case 1: there is no overlap between the previous
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* segment and this one. Apply protections to the
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* previous segment, and protect the gap between the
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* previous and current segments, if any.
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*/
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link_elf_protect_range(ef, start, end, prot);
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link_elf_protect_range(ef, end, segstart, gapprot);
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start = segstart;
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end = segend;
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prot = segprot;
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} else if (start < segstart && end == segend) {
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/*
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* Case 2: the current segment is a subrange of the
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* previous segment. Apply protections to the
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* non-overlapping portion of the previous segment.
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*/
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link_elf_protect_range(ef, start, segstart, prot);
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start = segstart;
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prot |= segprot;
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} else if (end < segend) {
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/*
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* Case 3: there is partial overlap between the previous
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* and current segments. Apply protections to the
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* non-overlapping portion of the previous segment, and
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* then the overlap, which must use the union of the two
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* segments' protections.
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*/
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link_elf_protect_range(ef, start, segstart, prot);
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link_elf_protect_range(ef, segstart, end,
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prot | segprot);
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start = end;
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end = segend;
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prot = segprot;
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} else {
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/*
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* Case 4: the two segments reside in the same page.
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*/
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prot |= segprot;
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}
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}
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/*
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* Fix up the last unprotected segment and trailing data.
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*/
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link_elf_protect_range(ef, start, end, prot);
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link_elf_protect_range(ef, end,
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round_page((vm_offset_t)ef->address + ef->lf.size), gapprot);
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}
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static int
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link_elf_link_preload(linker_class_t cls, const char *filename,
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linker_file_t *result)
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{
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Elf_Ehdr *hdr;
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Elf_Shdr *shdr;
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Elf_Sym *es;
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void *modptr, *baseptr, *sizeptr;
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char *type;
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elf_file_t ef;
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linker_file_t lf;
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Elf_Addr off;
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int error, i, j, pb, ra, rl, shstrindex, symstrindex, symtabindex;
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/* Look to see if we have the file preloaded */
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modptr = preload_search_by_name(filename);
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if (modptr == NULL)
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return ENOENT;
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type = (char *)preload_search_info(modptr, MODINFO_TYPE);
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baseptr = preload_search_info(modptr, MODINFO_ADDR);
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sizeptr = preload_search_info(modptr, MODINFO_SIZE);
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hdr = (Elf_Ehdr *)preload_search_info(modptr, MODINFO_METADATA |
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MODINFOMD_ELFHDR);
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shdr = (Elf_Shdr *)preload_search_info(modptr, MODINFO_METADATA |
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MODINFOMD_SHDR);
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if (type == NULL || (strcmp(type, "elf" __XSTRING(__ELF_WORD_SIZE)
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" obj module") != 0 &&
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strcmp(type, "elf obj module") != 0)) {
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return (EFTYPE);
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}
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if (baseptr == NULL || sizeptr == NULL || hdr == NULL ||
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shdr == NULL)
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return (EINVAL);
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lf = linker_make_file(filename, &link_elf_class);
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if (lf == NULL)
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return (ENOMEM);
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ef = (elf_file_t)lf;
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ef->preloaded = 1;
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ef->address = *(caddr_t *)baseptr;
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lf->address = *(caddr_t *)baseptr;
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lf->size = *(size_t *)sizeptr;
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if (hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS ||
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hdr->e_ident[EI_DATA] != ELF_TARG_DATA ||
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hdr->e_ident[EI_VERSION] != EV_CURRENT ||
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hdr->e_version != EV_CURRENT ||
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hdr->e_type != ET_REL ||
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hdr->e_machine != ELF_TARG_MACH) {
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error = EFTYPE;
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goto out;
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}
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ef->e_shdr = shdr;
|
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|
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/* Scan the section header for information and table sizing. */
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symtabindex = -1;
|
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symstrindex = -1;
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for (i = 0; i < hdr->e_shnum; i++) {
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switch (shdr[i].sh_type) {
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case SHT_PROGBITS:
|
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case SHT_NOBITS:
|
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#ifdef __amd64__
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case SHT_X86_64_UNWIND:
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#endif
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case SHT_INIT_ARRAY:
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case SHT_FINI_ARRAY:
|
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/* Ignore sections not loaded by the loader. */
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if (shdr[i].sh_addr == 0)
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break;
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ef->nprogtab++;
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break;
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case SHT_SYMTAB:
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symtabindex = i;
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symstrindex = shdr[i].sh_link;
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break;
|
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case SHT_REL:
|
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/*
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* Ignore relocation tables for sections not
|
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* loaded by the loader.
|
|
*/
|
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if (shdr[shdr[i].sh_info].sh_addr == 0)
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break;
|
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ef->nreltab++;
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break;
|
|
case SHT_RELA:
|
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if (shdr[shdr[i].sh_info].sh_addr == 0)
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break;
|
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ef->nrelatab++;
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break;
|
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}
|
|
}
|
|
|
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shstrindex = hdr->e_shstrndx;
|
|
if (ef->nprogtab == 0 || symstrindex < 0 ||
|
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symstrindex >= hdr->e_shnum ||
|
|
shdr[symstrindex].sh_type != SHT_STRTAB || shstrindex == 0 ||
|
|
shstrindex >= hdr->e_shnum ||
|
|
shdr[shstrindex].sh_type != SHT_STRTAB) {
|
|
printf("%s: bad/missing section headers\n", filename);
|
|
error = ENOEXEC;
|
|
goto out;
|
|
}
|
|
|
|
/* Allocate space for tracking the load chunks */
|
|
if (ef->nprogtab != 0)
|
|
ef->progtab = malloc(ef->nprogtab * sizeof(*ef->progtab),
|
|
M_LINKER, M_WAITOK | M_ZERO);
|
|
if (ef->nreltab != 0)
|
|
ef->reltab = malloc(ef->nreltab * sizeof(*ef->reltab),
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M_LINKER, M_WAITOK | M_ZERO);
|
|
if (ef->nrelatab != 0)
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|
ef->relatab = malloc(ef->nrelatab * sizeof(*ef->relatab),
|
|
M_LINKER, M_WAITOK | M_ZERO);
|
|
if ((ef->nprogtab != 0 && ef->progtab == NULL) ||
|
|
(ef->nreltab != 0 && ef->reltab == NULL) ||
|
|
(ef->nrelatab != 0 && ef->relatab == NULL)) {
|
|
error = ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
/* XXX, relocate the sh_addr fields saved by the loader. */
|
|
off = 0;
|
|
for (i = 0; i < hdr->e_shnum; i++) {
|
|
if (shdr[i].sh_addr != 0 && (off == 0 || shdr[i].sh_addr < off))
|
|
off = shdr[i].sh_addr;
|
|
}
|
|
for (i = 0; i < hdr->e_shnum; i++) {
|
|
if (shdr[i].sh_addr != 0)
|
|
shdr[i].sh_addr = shdr[i].sh_addr - off +
|
|
(Elf_Addr)ef->address;
|
|
}
|
|
|
|
ef->ddbsymcnt = shdr[symtabindex].sh_size / sizeof(Elf_Sym);
|
|
ef->ddbsymtab = (Elf_Sym *)shdr[symtabindex].sh_addr;
|
|
ef->ddbstrcnt = shdr[symstrindex].sh_size;
|
|
ef->ddbstrtab = (char *)shdr[symstrindex].sh_addr;
|
|
ef->shstrcnt = shdr[shstrindex].sh_size;
|
|
ef->shstrtab = (char *)shdr[shstrindex].sh_addr;
|
|
|
|
/* Now fill out progtab and the relocation tables. */
|
|
pb = 0;
|
|
rl = 0;
|
|
ra = 0;
|
|
for (i = 0; i < hdr->e_shnum; i++) {
|
|
switch (shdr[i].sh_type) {
|
|
case SHT_PROGBITS:
|
|
case SHT_NOBITS:
|
|
#ifdef __amd64__
|
|
case SHT_X86_64_UNWIND:
|
|
#endif
|
|
case SHT_INIT_ARRAY:
|
|
case SHT_FINI_ARRAY:
|
|
if (shdr[i].sh_addr == 0)
|
|
break;
|
|
ef->progtab[pb].addr = (void *)shdr[i].sh_addr;
|
|
if (shdr[i].sh_type == SHT_PROGBITS)
|
|
ef->progtab[pb].name = "<<PROGBITS>>";
|
|
#ifdef __amd64__
|
|
else if (shdr[i].sh_type == SHT_X86_64_UNWIND)
|
|
ef->progtab[pb].name = "<<UNWIND>>";
|
|
#endif
|
|
else if (shdr[i].sh_type == SHT_INIT_ARRAY)
|
|
ef->progtab[pb].name = "<<INIT_ARRAY>>";
|
|
else if (shdr[i].sh_type == SHT_FINI_ARRAY)
|
|
ef->progtab[pb].name = "<<FINI_ARRAY>>";
|
|
else
|
|
ef->progtab[pb].name = "<<NOBITS>>";
|
|
ef->progtab[pb].size = shdr[i].sh_size;
|
|
ef->progtab[pb].flags = shdr[i].sh_flags;
|
|
ef->progtab[pb].sec = i;
|
|
if (ef->shstrtab && shdr[i].sh_name != 0)
|
|
ef->progtab[pb].name =
|
|
ef->shstrtab + shdr[i].sh_name;
|
|
if (ef->progtab[pb].name != NULL &&
|
|
!strcmp(ef->progtab[pb].name, DPCPU_SETNAME)) {
|
|
void *dpcpu;
|
|
|
|
dpcpu = dpcpu_alloc(shdr[i].sh_size);
|
|
if (dpcpu == NULL) {
|
|
printf("%s: pcpu module space is out "
|
|
"of space; cannot allocate %#jx "
|
|
"for %s\n", __func__,
|
|
(uintmax_t)shdr[i].sh_size,
|
|
filename);
|
|
error = ENOSPC;
|
|
goto out;
|
|
}
|
|
memcpy(dpcpu, ef->progtab[pb].addr,
|
|
ef->progtab[pb].size);
|
|
dpcpu_copy(dpcpu, shdr[i].sh_size);
|
|
ef->progtab[pb].addr = dpcpu;
|
|
#ifdef VIMAGE
|
|
} else if (ef->progtab[pb].name != NULL &&
|
|
!strcmp(ef->progtab[pb].name, VNET_SETNAME)) {
|
|
void *vnet_data;
|
|
|
|
vnet_data = vnet_data_alloc(shdr[i].sh_size);
|
|
if (vnet_data == NULL) {
|
|
printf("%s: vnet module space is out "
|
|
"of space; cannot allocate %#jx "
|
|
"for %s\n", __func__,
|
|
(uintmax_t)shdr[i].sh_size,
|
|
filename);
|
|
error = ENOSPC;
|
|
goto out;
|
|
}
|
|
memcpy(vnet_data, ef->progtab[pb].addr,
|
|
ef->progtab[pb].size);
|
|
vnet_data_copy(vnet_data, shdr[i].sh_size);
|
|
ef->progtab[pb].addr = vnet_data;
|
|
#endif
|
|
} else if ((ef->progtab[pb].name != NULL &&
|
|
strcmp(ef->progtab[pb].name, ".ctors") == 0) ||
|
|
shdr[i].sh_type == SHT_INIT_ARRAY) {
|
|
if (lf->ctors_addr != 0) {
|
|
printf(
|
|
"%s: multiple ctor sections in %s\n",
|
|
__func__, filename);
|
|
} else {
|
|
lf->ctors_addr = ef->progtab[pb].addr;
|
|
lf->ctors_size = shdr[i].sh_size;
|
|
}
|
|
} else if ((ef->progtab[pb].name != NULL &&
|
|
strcmp(ef->progtab[pb].name, ".dtors") == 0) ||
|
|
shdr[i].sh_type == SHT_FINI_ARRAY) {
|
|
if (lf->dtors_addr != 0) {
|
|
printf(
|
|
"%s: multiple dtor sections in %s\n",
|
|
__func__, filename);
|
|
} else {
|
|
lf->dtors_addr = ef->progtab[pb].addr;
|
|
lf->dtors_size = shdr[i].sh_size;
|
|
}
|
|
}
|
|
|
|
/* Update all symbol values with the offset. */
|
|
for (j = 0; j < ef->ddbsymcnt; j++) {
|
|
es = &ef->ddbsymtab[j];
|
|
if (es->st_shndx != i)
|
|
continue;
|
|
es->st_value += (Elf_Addr)ef->progtab[pb].addr;
|
|
}
|
|
pb++;
|
|
break;
|
|
case SHT_REL:
|
|
if (shdr[shdr[i].sh_info].sh_addr == 0)
|
|
break;
|
|
ef->reltab[rl].rel = (Elf_Rel *)shdr[i].sh_addr;
|
|
ef->reltab[rl].nrel = shdr[i].sh_size / sizeof(Elf_Rel);
|
|
ef->reltab[rl].sec = shdr[i].sh_info;
|
|
rl++;
|
|
break;
|
|
case SHT_RELA:
|
|
if (shdr[shdr[i].sh_info].sh_addr == 0)
|
|
break;
|
|
ef->relatab[ra].rela = (Elf_Rela *)shdr[i].sh_addr;
|
|
ef->relatab[ra].nrela =
|
|
shdr[i].sh_size / sizeof(Elf_Rela);
|
|
ef->relatab[ra].sec = shdr[i].sh_info;
|
|
ra++;
|
|
break;
|
|
}
|
|
}
|
|
if (pb != ef->nprogtab) {
|
|
printf("%s: lost progbits\n", filename);
|
|
error = ENOEXEC;
|
|
goto out;
|
|
}
|
|
if (rl != ef->nreltab) {
|
|
printf("%s: lost reltab\n", filename);
|
|
error = ENOEXEC;
|
|
goto out;
|
|
}
|
|
if (ra != ef->nrelatab) {
|
|
printf("%s: lost relatab\n", filename);
|
|
error = ENOEXEC;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* The file needs to be writeable and executable while applying
|
|
* relocations. Mapping protections are applied once relocation
|
|
* processing is complete.
|
|
*/
|
|
link_elf_protect_range(ef, (vm_offset_t)ef->address,
|
|
round_page((vm_offset_t)ef->address + ef->lf.size), VM_PROT_ALL);
|
|
|
|
/* Local intra-module relocations */
|
|
error = link_elf_reloc_local(lf, false);
|
|
if (error != 0)
|
|
goto out;
|
|
*result = lf;
|
|
return (0);
|
|
|
|
out:
|
|
/* preload not done this way */
|
|
linker_file_unload(lf, LINKER_UNLOAD_FORCE);
|
|
return (error);
|
|
}
|
|
|
|
static void
|
|
link_elf_invoke_cbs(caddr_t addr, size_t size)
|
|
{
|
|
void (**ctor)(void);
|
|
size_t i, cnt;
|
|
|
|
if (addr == NULL || size == 0)
|
|
return;
|
|
cnt = size / sizeof(*ctor);
|
|
ctor = (void *)addr;
|
|
for (i = 0; i < cnt; i++) {
|
|
if (ctor[i] != NULL)
|
|
(*ctor[i])();
|
|
}
|
|
}
|
|
|
|
static int
|
|
link_elf_link_preload_finish(linker_file_t lf)
|
|
{
|
|
elf_file_t ef;
|
|
int error;
|
|
|
|
ef = (elf_file_t)lf;
|
|
error = relocate_file(ef);
|
|
if (error)
|
|
return (error);
|
|
|
|
/* Notify MD code that a module is being loaded. */
|
|
error = elf_cpu_load_file(lf);
|
|
if (error)
|
|
return (error);
|
|
|
|
#if defined(__i386__) || defined(__amd64__)
|
|
/* Now ifuncs. */
|
|
error = link_elf_reloc_local(lf, true);
|
|
if (error != 0)
|
|
return (error);
|
|
#endif
|
|
|
|
/* Apply protections now that relocation processing is complete. */
|
|
link_elf_protect(ef);
|
|
|
|
link_elf_invoke_cbs(lf->ctors_addr, lf->ctors_size);
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
link_elf_load_file(linker_class_t cls, const char *filename,
|
|
linker_file_t *result)
|
|
{
|
|
struct nameidata *nd;
|
|
struct thread *td = curthread; /* XXX */
|
|
Elf_Ehdr *hdr;
|
|
Elf_Shdr *shdr;
|
|
Elf_Sym *es;
|
|
int nbytes, i, j;
|
|
vm_offset_t mapbase;
|
|
size_t mapsize;
|
|
int error = 0;
|
|
ssize_t resid;
|
|
int flags;
|
|
elf_file_t ef;
|
|
linker_file_t lf;
|
|
int symtabindex;
|
|
int symstrindex;
|
|
int shstrindex;
|
|
int nsym;
|
|
int pb, rl, ra;
|
|
int alignmask;
|
|
|
|
shdr = NULL;
|
|
lf = NULL;
|
|
mapsize = 0;
|
|
hdr = NULL;
|
|
|
|
nd = malloc(sizeof(struct nameidata), M_TEMP, M_WAITOK);
|
|
NDINIT(nd, LOOKUP, FOLLOW, UIO_SYSSPACE, filename, td);
|
|
flags = FREAD;
|
|
error = vn_open(nd, &flags, 0, NULL);
|
|
if (error) {
|
|
free(nd, M_TEMP);
|
|
return error;
|
|
}
|
|
NDFREE(nd, NDF_ONLY_PNBUF);
|
|
if (nd->ni_vp->v_type != VREG) {
|
|
error = ENOEXEC;
|
|
goto out;
|
|
}
|
|
#ifdef MAC
|
|
error = mac_kld_check_load(td->td_ucred, nd->ni_vp);
|
|
if (error) {
|
|
goto out;
|
|
}
|
|
#endif
|
|
|
|
/* Read the elf header from the file. */
|
|
hdr = malloc(sizeof(*hdr), M_LINKER, M_WAITOK);
|
|
error = vn_rdwr(UIO_READ, nd->ni_vp, (void *)hdr, sizeof(*hdr), 0,
|
|
UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
|
|
&resid, td);
|
|
if (error)
|
|
goto out;
|
|
if (resid != 0){
|
|
error = ENOEXEC;
|
|
goto out;
|
|
}
|
|
|
|
if (!IS_ELF(*hdr)) {
|
|
error = ENOEXEC;
|
|
goto out;
|
|
}
|
|
|
|
if (hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS
|
|
|| hdr->e_ident[EI_DATA] != ELF_TARG_DATA) {
|
|
link_elf_error(filename, "Unsupported file layout");
|
|
error = ENOEXEC;
|
|
goto out;
|
|
}
|
|
if (hdr->e_ident[EI_VERSION] != EV_CURRENT
|
|
|| hdr->e_version != EV_CURRENT) {
|
|
link_elf_error(filename, "Unsupported file version");
|
|
error = ENOEXEC;
|
|
goto out;
|
|
}
|
|
if (hdr->e_type != ET_REL) {
|
|
error = ENOSYS;
|
|
goto out;
|
|
}
|
|
if (hdr->e_machine != ELF_TARG_MACH) {
|
|
link_elf_error(filename, "Unsupported machine");
|
|
error = ENOEXEC;
|
|
goto out;
|
|
}
|
|
|
|
lf = linker_make_file(filename, &link_elf_class);
|
|
if (!lf) {
|
|
error = ENOMEM;
|
|
goto out;
|
|
}
|
|
ef = (elf_file_t) lf;
|
|
ef->nprogtab = 0;
|
|
ef->e_shdr = 0;
|
|
ef->nreltab = 0;
|
|
ef->nrelatab = 0;
|
|
|
|
/* Allocate and read in the section header */
|
|
nbytes = hdr->e_shnum * hdr->e_shentsize;
|
|
if (nbytes == 0 || hdr->e_shoff == 0 ||
|
|
hdr->e_shentsize != sizeof(Elf_Shdr)) {
|
|
error = ENOEXEC;
|
|
goto out;
|
|
}
|
|
shdr = malloc(nbytes, M_LINKER, M_WAITOK);
|
|
ef->e_shdr = shdr;
|
|
error = vn_rdwr(UIO_READ, nd->ni_vp, (caddr_t)shdr, nbytes,
|
|
hdr->e_shoff, UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred,
|
|
NOCRED, &resid, td);
|
|
if (error)
|
|
goto out;
|
|
if (resid) {
|
|
error = ENOEXEC;
|
|
goto out;
|
|
}
|
|
|
|
/* Scan the section header for information and table sizing. */
|
|
nsym = 0;
|
|
symtabindex = -1;
|
|
symstrindex = -1;
|
|
for (i = 0; i < hdr->e_shnum; i++) {
|
|
if (shdr[i].sh_size == 0)
|
|
continue;
|
|
switch (shdr[i].sh_type) {
|
|
case SHT_PROGBITS:
|
|
case SHT_NOBITS:
|
|
#ifdef __amd64__
|
|
case SHT_X86_64_UNWIND:
|
|
#endif
|
|
case SHT_INIT_ARRAY:
|
|
case SHT_FINI_ARRAY:
|
|
if ((shdr[i].sh_flags & SHF_ALLOC) == 0)
|
|
break;
|
|
ef->nprogtab++;
|
|
break;
|
|
case SHT_SYMTAB:
|
|
nsym++;
|
|
symtabindex = i;
|
|
symstrindex = shdr[i].sh_link;
|
|
break;
|
|
case SHT_REL:
|
|
/*
|
|
* Ignore relocation tables for unallocated
|
|
* sections.
|
|
*/
|
|
if ((shdr[shdr[i].sh_info].sh_flags & SHF_ALLOC) == 0)
|
|
break;
|
|
ef->nreltab++;
|
|
break;
|
|
case SHT_RELA:
|
|
if ((shdr[shdr[i].sh_info].sh_flags & SHF_ALLOC) == 0)
|
|
break;
|
|
ef->nrelatab++;
|
|
break;
|
|
case SHT_STRTAB:
|
|
break;
|
|
}
|
|
}
|
|
if (ef->nprogtab == 0) {
|
|
link_elf_error(filename, "file has no contents");
|
|
error = ENOEXEC;
|
|
goto out;
|
|
}
|
|
if (nsym != 1) {
|
|
/* Only allow one symbol table for now */
|
|
link_elf_error(filename,
|
|
"file must have exactly one symbol table");
|
|
error = ENOEXEC;
|
|
goto out;
|
|
}
|
|
if (symstrindex < 0 || symstrindex > hdr->e_shnum ||
|
|
shdr[symstrindex].sh_type != SHT_STRTAB) {
|
|
link_elf_error(filename, "file has invalid symbol strings");
|
|
error = ENOEXEC;
|
|
goto out;
|
|
}
|
|
|
|
/* Allocate space for tracking the load chunks */
|
|
if (ef->nprogtab != 0)
|
|
ef->progtab = malloc(ef->nprogtab * sizeof(*ef->progtab),
|
|
M_LINKER, M_WAITOK | M_ZERO);
|
|
if (ef->nreltab != 0)
|
|
ef->reltab = malloc(ef->nreltab * sizeof(*ef->reltab),
|
|
M_LINKER, M_WAITOK | M_ZERO);
|
|
if (ef->nrelatab != 0)
|
|
ef->relatab = malloc(ef->nrelatab * sizeof(*ef->relatab),
|
|
M_LINKER, M_WAITOK | M_ZERO);
|
|
|
|
if (symtabindex == -1) {
|
|
link_elf_error(filename, "lost symbol table index");
|
|
error = ENOEXEC;
|
|
goto out;
|
|
}
|
|
/* Allocate space for and load the symbol table */
|
|
ef->ddbsymcnt = shdr[symtabindex].sh_size / sizeof(Elf_Sym);
|
|
ef->ddbsymtab = malloc(shdr[symtabindex].sh_size, M_LINKER, M_WAITOK);
|
|
error = vn_rdwr(UIO_READ, nd->ni_vp, (void *)ef->ddbsymtab,
|
|
shdr[symtabindex].sh_size, shdr[symtabindex].sh_offset,
|
|
UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
|
|
&resid, td);
|
|
if (error)
|
|
goto out;
|
|
if (resid != 0){
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
/* Allocate space for and load the symbol strings */
|
|
ef->ddbstrcnt = shdr[symstrindex].sh_size;
|
|
ef->ddbstrtab = malloc(shdr[symstrindex].sh_size, M_LINKER, M_WAITOK);
|
|
error = vn_rdwr(UIO_READ, nd->ni_vp, ef->ddbstrtab,
|
|
shdr[symstrindex].sh_size, shdr[symstrindex].sh_offset,
|
|
UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
|
|
&resid, td);
|
|
if (error)
|
|
goto out;
|
|
if (resid != 0){
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
/* Do we have a string table for the section names? */
|
|
shstrindex = -1;
|
|
if (hdr->e_shstrndx != 0 &&
|
|
shdr[hdr->e_shstrndx].sh_type == SHT_STRTAB) {
|
|
shstrindex = hdr->e_shstrndx;
|
|
ef->shstrcnt = shdr[shstrindex].sh_size;
|
|
ef->shstrtab = malloc(shdr[shstrindex].sh_size, M_LINKER,
|
|
M_WAITOK);
|
|
error = vn_rdwr(UIO_READ, nd->ni_vp, ef->shstrtab,
|
|
shdr[shstrindex].sh_size, shdr[shstrindex].sh_offset,
|
|
UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
|
|
&resid, td);
|
|
if (error)
|
|
goto out;
|
|
if (resid != 0){
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
/* Size up code/data(progbits) and bss(nobits). */
|
|
alignmask = 0;
|
|
for (i = 0; i < hdr->e_shnum; i++) {
|
|
if (shdr[i].sh_size == 0)
|
|
continue;
|
|
switch (shdr[i].sh_type) {
|
|
case SHT_PROGBITS:
|
|
case SHT_NOBITS:
|
|
#ifdef __amd64__
|
|
case SHT_X86_64_UNWIND:
|
|
#endif
|
|
case SHT_INIT_ARRAY:
|
|
case SHT_FINI_ARRAY:
|
|
if ((shdr[i].sh_flags & SHF_ALLOC) == 0)
|
|
break;
|
|
alignmask = shdr[i].sh_addralign - 1;
|
|
mapsize += alignmask;
|
|
mapsize &= ~alignmask;
|
|
mapsize += shdr[i].sh_size;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* We know how much space we need for the text/data/bss/etc.
|
|
* This stuff needs to be in a single chunk so that profiling etc
|
|
* can get the bounds and gdb can associate offsets with modules
|
|
*/
|
|
ef->object = vm_pager_allocate(OBJT_PHYS, NULL, round_page(mapsize),
|
|
VM_PROT_ALL, 0, thread0.td_ucred);
|
|
if (ef->object == NULL) {
|
|
error = ENOMEM;
|
|
goto out;
|
|
}
|
|
#if VM_NRESERVLEVEL > 0
|
|
vm_object_color(ef->object, 0);
|
|
#endif
|
|
|
|
/*
|
|
* In order to satisfy amd64's architectural requirements on the
|
|
* location of code and data in the kernel's address space, request a
|
|
* mapping that is above the kernel.
|
|
*
|
|
* Protections will be restricted once relocations are applied.
|
|
*/
|
|
#ifdef __amd64__
|
|
mapbase = KERNBASE;
|
|
#else
|
|
mapbase = VM_MIN_KERNEL_ADDRESS;
|
|
#endif
|
|
error = vm_map_find(kernel_map, ef->object, 0, &mapbase,
|
|
round_page(mapsize), 0, VMFS_OPTIMAL_SPACE, VM_PROT_ALL,
|
|
VM_PROT_ALL, 0);
|
|
if (error != KERN_SUCCESS) {
|
|
vm_object_deallocate(ef->object);
|
|
ef->object = NULL;
|
|
error = ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
/* Wire the pages */
|
|
error = vm_map_wire(kernel_map, mapbase,
|
|
mapbase + round_page(mapsize),
|
|
VM_MAP_WIRE_SYSTEM|VM_MAP_WIRE_NOHOLES);
|
|
if (error != KERN_SUCCESS) {
|
|
error = ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
/* Inform the kld system about the situation */
|
|
lf->address = ef->address = (caddr_t)mapbase;
|
|
lf->size = mapsize;
|
|
|
|
/*
|
|
* Now load code/data(progbits), zero bss(nobits), allocate space for
|
|
* and load relocs
|
|
*/
|
|
pb = 0;
|
|
rl = 0;
|
|
ra = 0;
|
|
alignmask = 0;
|
|
for (i = 0; i < hdr->e_shnum; i++) {
|
|
if (shdr[i].sh_size == 0)
|
|
continue;
|
|
switch (shdr[i].sh_type) {
|
|
case SHT_PROGBITS:
|
|
case SHT_NOBITS:
|
|
#ifdef __amd64__
|
|
case SHT_X86_64_UNWIND:
|
|
#endif
|
|
case SHT_INIT_ARRAY:
|
|
case SHT_FINI_ARRAY:
|
|
if ((shdr[i].sh_flags & SHF_ALLOC) == 0)
|
|
break;
|
|
alignmask = shdr[i].sh_addralign - 1;
|
|
mapbase += alignmask;
|
|
mapbase &= ~alignmask;
|
|
if (ef->shstrtab != NULL && shdr[i].sh_name != 0) {
|
|
ef->progtab[pb].name =
|
|
ef->shstrtab + shdr[i].sh_name;
|
|
if (!strcmp(ef->progtab[pb].name, ".ctors") ||
|
|
shdr[i].sh_type == SHT_INIT_ARRAY) {
|
|
if (lf->ctors_addr != 0) {
|
|
printf(
|
|
"%s: multiple ctor sections in %s\n",
|
|
__func__, filename);
|
|
} else {
|
|
lf->ctors_addr =
|
|
(caddr_t)mapbase;
|
|
lf->ctors_size =
|
|
shdr[i].sh_size;
|
|
}
|
|
} else if (!strcmp(ef->progtab[pb].name,
|
|
".dtors") ||
|
|
shdr[i].sh_type == SHT_FINI_ARRAY) {
|
|
if (lf->dtors_addr != 0) {
|
|
printf(
|
|
"%s: multiple dtor sections in %s\n",
|
|
__func__, filename);
|
|
} else {
|
|
lf->dtors_addr =
|
|
(caddr_t)mapbase;
|
|
lf->dtors_size =
|
|
shdr[i].sh_size;
|
|
}
|
|
}
|
|
} else if (shdr[i].sh_type == SHT_PROGBITS)
|
|
ef->progtab[pb].name = "<<PROGBITS>>";
|
|
#ifdef __amd64__
|
|
else if (shdr[i].sh_type == SHT_X86_64_UNWIND)
|
|
ef->progtab[pb].name = "<<UNWIND>>";
|
|
#endif
|
|
else
|
|
ef->progtab[pb].name = "<<NOBITS>>";
|
|
if (ef->progtab[pb].name != NULL &&
|
|
!strcmp(ef->progtab[pb].name, DPCPU_SETNAME)) {
|
|
ef->progtab[pb].addr =
|
|
dpcpu_alloc(shdr[i].sh_size);
|
|
if (ef->progtab[pb].addr == NULL) {
|
|
printf("%s: pcpu module space is out "
|
|
"of space; cannot allocate %#jx "
|
|
"for %s\n", __func__,
|
|
(uintmax_t)shdr[i].sh_size,
|
|
filename);
|
|
}
|
|
}
|
|
#ifdef VIMAGE
|
|
else if (ef->progtab[pb].name != NULL &&
|
|
!strcmp(ef->progtab[pb].name, VNET_SETNAME)) {
|
|
ef->progtab[pb].addr =
|
|
vnet_data_alloc(shdr[i].sh_size);
|
|
if (ef->progtab[pb].addr == NULL) {
|
|
printf("%s: vnet module space is out "
|
|
"of space; cannot allocate %#jx "
|
|
"for %s\n", __func__,
|
|
(uintmax_t)shdr[i].sh_size,
|
|
filename);
|
|
}
|
|
}
|
|
#endif
|
|
else
|
|
ef->progtab[pb].addr =
|
|
(void *)(uintptr_t)mapbase;
|
|
if (ef->progtab[pb].addr == NULL) {
|
|
error = ENOSPC;
|
|
goto out;
|
|
}
|
|
ef->progtab[pb].size = shdr[i].sh_size;
|
|
ef->progtab[pb].flags = shdr[i].sh_flags;
|
|
ef->progtab[pb].sec = i;
|
|
if (shdr[i].sh_type == SHT_PROGBITS
|
|
#ifdef __amd64__
|
|
|| shdr[i].sh_type == SHT_X86_64_UNWIND
|
|
#endif
|
|
) {
|
|
error = vn_rdwr(UIO_READ, nd->ni_vp,
|
|
ef->progtab[pb].addr,
|
|
shdr[i].sh_size, shdr[i].sh_offset,
|
|
UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred,
|
|
NOCRED, &resid, td);
|
|
if (error)
|
|
goto out;
|
|
if (resid != 0){
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
/* Initialize the per-cpu or vnet area. */
|
|
if (ef->progtab[pb].addr != (void *)mapbase &&
|
|
!strcmp(ef->progtab[pb].name, DPCPU_SETNAME))
|
|
dpcpu_copy(ef->progtab[pb].addr,
|
|
shdr[i].sh_size);
|
|
#ifdef VIMAGE
|
|
else if (ef->progtab[pb].addr !=
|
|
(void *)mapbase &&
|
|
!strcmp(ef->progtab[pb].name, VNET_SETNAME))
|
|
vnet_data_copy(ef->progtab[pb].addr,
|
|
shdr[i].sh_size);
|
|
#endif
|
|
} else
|
|
bzero(ef->progtab[pb].addr, shdr[i].sh_size);
|
|
|
|
/* Update all symbol values with the offset. */
|
|
for (j = 0; j < ef->ddbsymcnt; j++) {
|
|
es = &ef->ddbsymtab[j];
|
|
if (es->st_shndx != i)
|
|
continue;
|
|
es->st_value += (Elf_Addr)ef->progtab[pb].addr;
|
|
}
|
|
mapbase += shdr[i].sh_size;
|
|
pb++;
|
|
break;
|
|
case SHT_REL:
|
|
if ((shdr[shdr[i].sh_info].sh_flags & SHF_ALLOC) == 0)
|
|
break;
|
|
ef->reltab[rl].rel = malloc(shdr[i].sh_size, M_LINKER,
|
|
M_WAITOK);
|
|
ef->reltab[rl].nrel = shdr[i].sh_size / sizeof(Elf_Rel);
|
|
ef->reltab[rl].sec = shdr[i].sh_info;
|
|
error = vn_rdwr(UIO_READ, nd->ni_vp,
|
|
(void *)ef->reltab[rl].rel,
|
|
shdr[i].sh_size, shdr[i].sh_offset,
|
|
UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
|
|
&resid, td);
|
|
if (error)
|
|
goto out;
|
|
if (resid != 0){
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
rl++;
|
|
break;
|
|
case SHT_RELA:
|
|
if ((shdr[shdr[i].sh_info].sh_flags & SHF_ALLOC) == 0)
|
|
break;
|
|
ef->relatab[ra].rela = malloc(shdr[i].sh_size, M_LINKER,
|
|
M_WAITOK);
|
|
ef->relatab[ra].nrela =
|
|
shdr[i].sh_size / sizeof(Elf_Rela);
|
|
ef->relatab[ra].sec = shdr[i].sh_info;
|
|
error = vn_rdwr(UIO_READ, nd->ni_vp,
|
|
(void *)ef->relatab[ra].rela,
|
|
shdr[i].sh_size, shdr[i].sh_offset,
|
|
UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
|
|
&resid, td);
|
|
if (error)
|
|
goto out;
|
|
if (resid != 0){
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
ra++;
|
|
break;
|
|
}
|
|
}
|
|
if (pb != ef->nprogtab) {
|
|
link_elf_error(filename, "lost progbits");
|
|
error = ENOEXEC;
|
|
goto out;
|
|
}
|
|
if (rl != ef->nreltab) {
|
|
link_elf_error(filename, "lost reltab");
|
|
error = ENOEXEC;
|
|
goto out;
|
|
}
|
|
if (ra != ef->nrelatab) {
|
|
link_elf_error(filename, "lost relatab");
|
|
error = ENOEXEC;
|
|
goto out;
|
|
}
|
|
if (mapbase != (vm_offset_t)ef->address + mapsize) {
|
|
printf(
|
|
"%s: mapbase 0x%lx != address %p + mapsize 0x%lx (0x%lx)\n",
|
|
filename != NULL ? filename : "<none>",
|
|
(u_long)mapbase, ef->address, (u_long)mapsize,
|
|
(u_long)(vm_offset_t)ef->address + mapsize);
|
|
error = ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
/* Local intra-module relocations */
|
|
error = link_elf_reloc_local(lf, false);
|
|
if (error != 0)
|
|
goto out;
|
|
|
|
/* Pull in dependencies */
|
|
VOP_UNLOCK(nd->ni_vp);
|
|
error = linker_load_dependencies(lf);
|
|
vn_lock(nd->ni_vp, LK_EXCLUSIVE | LK_RETRY);
|
|
if (error)
|
|
goto out;
|
|
|
|
/* External relocations */
|
|
error = relocate_file(ef);
|
|
if (error)
|
|
goto out;
|
|
|
|
/* Notify MD code that a module is being loaded. */
|
|
error = elf_cpu_load_file(lf);
|
|
if (error)
|
|
goto out;
|
|
|
|
#if defined(__i386__) || defined(__amd64__)
|
|
/* Now ifuncs. */
|
|
error = link_elf_reloc_local(lf, true);
|
|
if (error != 0)
|
|
goto out;
|
|
#endif
|
|
|
|
link_elf_protect(ef);
|
|
link_elf_invoke_cbs(lf->ctors_addr, lf->ctors_size);
|
|
*result = lf;
|
|
|
|
out:
|
|
VOP_UNLOCK(nd->ni_vp);
|
|
vn_close(nd->ni_vp, FREAD, td->td_ucred, td);
|
|
free(nd, M_TEMP);
|
|
if (error && lf)
|
|
linker_file_unload(lf, LINKER_UNLOAD_FORCE);
|
|
free(hdr, M_LINKER);
|
|
|
|
return error;
|
|
}
|
|
|
|
static void
|
|
link_elf_unload_file(linker_file_t file)
|
|
{
|
|
elf_file_t ef = (elf_file_t) file;
|
|
u_int i;
|
|
|
|
link_elf_invoke_cbs(file->dtors_addr, file->dtors_size);
|
|
|
|
/* Notify MD code that a module is being unloaded. */
|
|
elf_cpu_unload_file(file);
|
|
|
|
if (ef->progtab) {
|
|
for (i = 0; i < ef->nprogtab; i++) {
|
|
if (ef->progtab[i].size == 0)
|
|
continue;
|
|
if (ef->progtab[i].name == NULL)
|
|
continue;
|
|
if (!strcmp(ef->progtab[i].name, DPCPU_SETNAME))
|
|
dpcpu_free(ef->progtab[i].addr,
|
|
ef->progtab[i].size);
|
|
#ifdef VIMAGE
|
|
else if (!strcmp(ef->progtab[i].name, VNET_SETNAME))
|
|
vnet_data_free(ef->progtab[i].addr,
|
|
ef->progtab[i].size);
|
|
#endif
|
|
}
|
|
}
|
|
if (ef->preloaded) {
|
|
free(ef->reltab, M_LINKER);
|
|
free(ef->relatab, M_LINKER);
|
|
free(ef->progtab, M_LINKER);
|
|
free(ef->ctftab, M_LINKER);
|
|
free(ef->ctfoff, M_LINKER);
|
|
free(ef->typoff, M_LINKER);
|
|
if (file->pathname != NULL)
|
|
preload_delete_name(file->pathname);
|
|
return;
|
|
}
|
|
|
|
for (i = 0; i < ef->nreltab; i++)
|
|
free(ef->reltab[i].rel, M_LINKER);
|
|
for (i = 0; i < ef->nrelatab; i++)
|
|
free(ef->relatab[i].rela, M_LINKER);
|
|
free(ef->reltab, M_LINKER);
|
|
free(ef->relatab, M_LINKER);
|
|
free(ef->progtab, M_LINKER);
|
|
|
|
if (ef->object != NULL)
|
|
vm_map_remove(kernel_map, (vm_offset_t)ef->address,
|
|
(vm_offset_t)ef->address + ptoa(ef->object->size));
|
|
free(ef->e_shdr, M_LINKER);
|
|
free(ef->ddbsymtab, M_LINKER);
|
|
free(ef->ddbstrtab, M_LINKER);
|
|
free(ef->shstrtab, M_LINKER);
|
|
free(ef->ctftab, M_LINKER);
|
|
free(ef->ctfoff, M_LINKER);
|
|
free(ef->typoff, M_LINKER);
|
|
}
|
|
|
|
static const char *
|
|
symbol_name(elf_file_t ef, Elf_Size r_info)
|
|
{
|
|
const Elf_Sym *ref;
|
|
|
|
if (ELF_R_SYM(r_info)) {
|
|
ref = ef->ddbsymtab + ELF_R_SYM(r_info);
|
|
return ef->ddbstrtab + ref->st_name;
|
|
} else
|
|
return NULL;
|
|
}
|
|
|
|
static Elf_Addr
|
|
findbase(elf_file_t ef, int sec)
|
|
{
|
|
int i;
|
|
Elf_Addr base = 0;
|
|
|
|
for (i = 0; i < ef->nprogtab; i++) {
|
|
if (sec == ef->progtab[i].sec) {
|
|
base = (Elf_Addr)ef->progtab[i].addr;
|
|
break;
|
|
}
|
|
}
|
|
return base;
|
|
}
|
|
|
|
static int
|
|
relocate_file1(elf_file_t ef, bool ifuncs)
|
|
{
|
|
const Elf_Rel *rellim;
|
|
const Elf_Rel *rel;
|
|
const Elf_Rela *relalim;
|
|
const Elf_Rela *rela;
|
|
const char *symname;
|
|
const Elf_Sym *sym;
|
|
int i;
|
|
Elf_Size symidx;
|
|
Elf_Addr base;
|
|
|
|
/* Perform relocations without addend if there are any: */
|
|
for (i = 0; i < ef->nreltab; i++) {
|
|
rel = ef->reltab[i].rel;
|
|
if (rel == NULL) {
|
|
link_elf_error(ef->lf.filename, "lost a reltab!");
|
|
return (ENOEXEC);
|
|
}
|
|
rellim = rel + ef->reltab[i].nrel;
|
|
base = findbase(ef, ef->reltab[i].sec);
|
|
if (base == 0) {
|
|
link_elf_error(ef->lf.filename, "lost base for reltab");
|
|
return (ENOEXEC);
|
|
}
|
|
for ( ; rel < rellim; rel++) {
|
|
symidx = ELF_R_SYM(rel->r_info);
|
|
if (symidx >= ef->ddbsymcnt)
|
|
continue;
|
|
sym = ef->ddbsymtab + symidx;
|
|
/* Local relocs are already done */
|
|
if (ELF_ST_BIND(sym->st_info) == STB_LOCAL)
|
|
continue;
|
|
if ((ELF_ST_TYPE(sym->st_info) == STT_GNU_IFUNC ||
|
|
elf_is_ifunc_reloc(rel->r_info)) != ifuncs)
|
|
continue;
|
|
if (elf_reloc(&ef->lf, base, rel, ELF_RELOC_REL,
|
|
elf_obj_lookup)) {
|
|
symname = symbol_name(ef, rel->r_info);
|
|
printf("link_elf_obj: symbol %s undefined\n",
|
|
symname);
|
|
return (ENOENT);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Perform relocations with addend if there are any: */
|
|
for (i = 0; i < ef->nrelatab; i++) {
|
|
rela = ef->relatab[i].rela;
|
|
if (rela == NULL) {
|
|
link_elf_error(ef->lf.filename, "lost a relatab!");
|
|
return (ENOEXEC);
|
|
}
|
|
relalim = rela + ef->relatab[i].nrela;
|
|
base = findbase(ef, ef->relatab[i].sec);
|
|
if (base == 0) {
|
|
link_elf_error(ef->lf.filename,
|
|
"lost base for relatab");
|
|
return (ENOEXEC);
|
|
}
|
|
for ( ; rela < relalim; rela++) {
|
|
symidx = ELF_R_SYM(rela->r_info);
|
|
if (symidx >= ef->ddbsymcnt)
|
|
continue;
|
|
sym = ef->ddbsymtab + symidx;
|
|
/* Local relocs are already done */
|
|
if (ELF_ST_BIND(sym->st_info) == STB_LOCAL)
|
|
continue;
|
|
if ((ELF_ST_TYPE(sym->st_info) == STT_GNU_IFUNC ||
|
|
elf_is_ifunc_reloc(rela->r_info)) != ifuncs)
|
|
continue;
|
|
if (elf_reloc(&ef->lf, base, rela, ELF_RELOC_RELA,
|
|
elf_obj_lookup)) {
|
|
symname = symbol_name(ef, rela->r_info);
|
|
printf("link_elf_obj: symbol %s undefined\n",
|
|
symname);
|
|
return (ENOENT);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Only clean SHN_FBSD_CACHED for successful return. If we
|
|
* modified symbol table for the object but found an
|
|
* unresolved symbol, there is no reason to roll back.
|
|
*/
|
|
elf_obj_cleanup_globals_cache(ef);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
relocate_file(elf_file_t ef)
|
|
{
|
|
int error;
|
|
|
|
error = relocate_file1(ef, false);
|
|
if (error == 0)
|
|
error = relocate_file1(ef, true);
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
link_elf_lookup_symbol1(linker_file_t lf, const char *name, c_linker_sym_t *sym,
|
|
bool see_local)
|
|
{
|
|
elf_file_t ef = (elf_file_t)lf;
|
|
const Elf_Sym *symp;
|
|
const char *strp;
|
|
int i;
|
|
|
|
for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) {
|
|
strp = ef->ddbstrtab + symp->st_name;
|
|
if (symp->st_shndx != SHN_UNDEF && strcmp(name, strp) == 0) {
|
|
if (see_local ||
|
|
ELF_ST_BIND(symp->st_info) == STB_GLOBAL) {
|
|
*sym = (c_linker_sym_t) symp;
|
|
return (0);
|
|
}
|
|
return (ENOENT);
|
|
}
|
|
}
|
|
return (ENOENT);
|
|
}
|
|
|
|
static int
|
|
link_elf_lookup_symbol(linker_file_t lf, const char *name, c_linker_sym_t *sym)
|
|
{
|
|
return (link_elf_lookup_symbol1(lf, name, sym,
|
|
link_elf_obj_leak_locals));
|
|
}
|
|
|
|
static int
|
|
link_elf_lookup_debug_symbol(linker_file_t lf, const char *name,
|
|
c_linker_sym_t *sym)
|
|
{
|
|
return (link_elf_lookup_symbol1(lf, name, sym, true));
|
|
}
|
|
|
|
static int
|
|
link_elf_symbol_values1(linker_file_t lf, c_linker_sym_t sym,
|
|
linker_symval_t *symval, bool see_local)
|
|
{
|
|
elf_file_t ef;
|
|
const Elf_Sym *es;
|
|
caddr_t val;
|
|
|
|
ef = (elf_file_t) lf;
|
|
es = (const Elf_Sym*) sym;
|
|
val = (caddr_t)es->st_value;
|
|
if (es >= ef->ddbsymtab && es < (ef->ddbsymtab + ef->ddbsymcnt)) {
|
|
if (!see_local && ELF_ST_BIND(es->st_info) == STB_LOCAL)
|
|
return (ENOENT);
|
|
symval->name = ef->ddbstrtab + es->st_name;
|
|
val = (caddr_t)es->st_value;
|
|
if (ELF_ST_TYPE(es->st_info) == STT_GNU_IFUNC)
|
|
val = ((caddr_t (*)(void))val)();
|
|
symval->value = val;
|
|
symval->size = es->st_size;
|
|
return (0);
|
|
}
|
|
return (ENOENT);
|
|
}
|
|
|
|
static int
|
|
link_elf_symbol_values(linker_file_t lf, c_linker_sym_t sym,
|
|
linker_symval_t *symval)
|
|
{
|
|
return (link_elf_symbol_values1(lf, sym, symval,
|
|
link_elf_obj_leak_locals));
|
|
}
|
|
|
|
static int
|
|
link_elf_debug_symbol_values(linker_file_t lf, c_linker_sym_t sym,
|
|
linker_symval_t *symval)
|
|
{
|
|
return (link_elf_symbol_values1(lf, sym, symval, true));
|
|
}
|
|
|
|
static int
|
|
link_elf_search_symbol(linker_file_t lf, caddr_t value,
|
|
c_linker_sym_t *sym, long *diffp)
|
|
{
|
|
elf_file_t ef = (elf_file_t)lf;
|
|
u_long off = (uintptr_t)(void *)value;
|
|
u_long diff = off;
|
|
u_long st_value;
|
|
const Elf_Sym *es;
|
|
const Elf_Sym *best = NULL;
|
|
int i;
|
|
|
|
for (i = 0, es = ef->ddbsymtab; i < ef->ddbsymcnt; i++, es++) {
|
|
if (es->st_name == 0)
|
|
continue;
|
|
st_value = es->st_value;
|
|
if (off >= st_value) {
|
|
if (off - st_value < diff) {
|
|
diff = off - st_value;
|
|
best = es;
|
|
if (diff == 0)
|
|
break;
|
|
} else if (off - st_value == diff) {
|
|
best = es;
|
|
}
|
|
}
|
|
}
|
|
if (best == NULL)
|
|
*diffp = off;
|
|
else
|
|
*diffp = diff;
|
|
*sym = (c_linker_sym_t) best;
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Look up a linker set on an ELF system.
|
|
*/
|
|
static int
|
|
link_elf_lookup_set(linker_file_t lf, const char *name,
|
|
void ***startp, void ***stopp, int *countp)
|
|
{
|
|
elf_file_t ef = (elf_file_t)lf;
|
|
void **start, **stop;
|
|
int i, count;
|
|
|
|
/* Relative to section number */
|
|
for (i = 0; i < ef->nprogtab; i++) {
|
|
if ((strncmp(ef->progtab[i].name, "set_", 4) == 0) &&
|
|
strcmp(ef->progtab[i].name + 4, name) == 0) {
|
|
start = (void **)ef->progtab[i].addr;
|
|
stop = (void **)((char *)ef->progtab[i].addr +
|
|
ef->progtab[i].size);
|
|
count = stop - start;
|
|
if (startp)
|
|
*startp = start;
|
|
if (stopp)
|
|
*stopp = stop;
|
|
if (countp)
|
|
*countp = count;
|
|
return (0);
|
|
}
|
|
}
|
|
return (ESRCH);
|
|
}
|
|
|
|
static int
|
|
link_elf_each_function_name(linker_file_t file,
|
|
int (*callback)(const char *, void *), void *opaque)
|
|
{
|
|
elf_file_t ef = (elf_file_t)file;
|
|
const Elf_Sym *symp;
|
|
int i, error;
|
|
|
|
/* Exhaustive search */
|
|
for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) {
|
|
if (symp->st_value != 0 &&
|
|
(ELF_ST_TYPE(symp->st_info) == STT_FUNC ||
|
|
ELF_ST_TYPE(symp->st_info) == STT_GNU_IFUNC)) {
|
|
error = callback(ef->ddbstrtab + symp->st_name, opaque);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
link_elf_each_function_nameval(linker_file_t file,
|
|
linker_function_nameval_callback_t callback, void *opaque)
|
|
{
|
|
linker_symval_t symval;
|
|
elf_file_t ef = (elf_file_t)file;
|
|
const Elf_Sym *symp;
|
|
int i, error;
|
|
|
|
/* Exhaustive search */
|
|
for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) {
|
|
if (symp->st_value != 0 &&
|
|
(ELF_ST_TYPE(symp->st_info) == STT_FUNC ||
|
|
ELF_ST_TYPE(symp->st_info) == STT_GNU_IFUNC)) {
|
|
error = link_elf_debug_symbol_values(file,
|
|
(c_linker_sym_t)symp, &symval);
|
|
if (error == 0)
|
|
error = callback(file, i, &symval, opaque);
|
|
if (error != 0)
|
|
return (error);
|
|
}
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
elf_obj_cleanup_globals_cache(elf_file_t ef)
|
|
{
|
|
Elf_Sym *sym;
|
|
Elf_Size i;
|
|
|
|
for (i = 0; i < ef->ddbsymcnt; i++) {
|
|
sym = ef->ddbsymtab + i;
|
|
if (sym->st_shndx == SHN_FBSD_CACHED) {
|
|
sym->st_shndx = SHN_UNDEF;
|
|
sym->st_value = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Symbol lookup function that can be used when the symbol index is known (ie
|
|
* in relocations). It uses the symbol index instead of doing a fully fledged
|
|
* hash table based lookup when such is valid. For example for local symbols.
|
|
* This is not only more efficient, it's also more correct. It's not always
|
|
* the case that the symbol can be found through the hash table.
|
|
*/
|
|
static int
|
|
elf_obj_lookup(linker_file_t lf, Elf_Size symidx, int deps, Elf_Addr *res)
|
|
{
|
|
elf_file_t ef = (elf_file_t)lf;
|
|
Elf_Sym *sym;
|
|
const char *symbol;
|
|
Elf_Addr res1;
|
|
|
|
/* Don't even try to lookup the symbol if the index is bogus. */
|
|
if (symidx >= ef->ddbsymcnt) {
|
|
*res = 0;
|
|
return (EINVAL);
|
|
}
|
|
|
|
sym = ef->ddbsymtab + symidx;
|
|
|
|
/* Quick answer if there is a definition included. */
|
|
if (sym->st_shndx != SHN_UNDEF) {
|
|
res1 = (Elf_Addr)sym->st_value;
|
|
if (ELF_ST_TYPE(sym->st_info) == STT_GNU_IFUNC)
|
|
res1 = ((Elf_Addr (*)(void))res1)();
|
|
*res = res1;
|
|
return (0);
|
|
}
|
|
|
|
/* If we get here, then it is undefined and needs a lookup. */
|
|
switch (ELF_ST_BIND(sym->st_info)) {
|
|
case STB_LOCAL:
|
|
/* Local, but undefined? huh? */
|
|
*res = 0;
|
|
return (EINVAL);
|
|
|
|
case STB_GLOBAL:
|
|
case STB_WEAK:
|
|
/* Relative to Data or Function name */
|
|
symbol = ef->ddbstrtab + sym->st_name;
|
|
|
|
/* Force a lookup failure if the symbol name is bogus. */
|
|
if (*symbol == 0) {
|
|
*res = 0;
|
|
return (EINVAL);
|
|
}
|
|
res1 = (Elf_Addr)linker_file_lookup_symbol(lf, symbol, deps);
|
|
|
|
/*
|
|
* Cache global lookups during module relocation. The failure
|
|
* case is particularly expensive for callers, who must scan
|
|
* through the entire globals table doing strcmp(). Cache to
|
|
* avoid doing such work repeatedly.
|
|
*
|
|
* After relocation is complete, undefined globals will be
|
|
* restored to SHN_UNDEF in elf_obj_cleanup_globals_cache(),
|
|
* above.
|
|
*/
|
|
if (res1 != 0) {
|
|
sym->st_shndx = SHN_FBSD_CACHED;
|
|
sym->st_value = res1;
|
|
*res = res1;
|
|
return (0);
|
|
} else if (ELF_ST_BIND(sym->st_info) == STB_WEAK) {
|
|
sym->st_value = 0;
|
|
*res = 0;
|
|
return (0);
|
|
}
|
|
return (EINVAL);
|
|
|
|
default:
|
|
return (EINVAL);
|
|
}
|
|
}
|
|
|
|
static void
|
|
link_elf_fix_link_set(elf_file_t ef)
|
|
{
|
|
static const char startn[] = "__start_";
|
|
static const char stopn[] = "__stop_";
|
|
Elf_Sym *sym;
|
|
const char *sym_name, *linkset_name;
|
|
Elf_Addr startp, stopp;
|
|
Elf_Size symidx;
|
|
int start, i;
|
|
|
|
startp = stopp = 0;
|
|
for (symidx = 1 /* zero entry is special */;
|
|
symidx < ef->ddbsymcnt; symidx++) {
|
|
sym = ef->ddbsymtab + symidx;
|
|
if (sym->st_shndx != SHN_UNDEF)
|
|
continue;
|
|
|
|
sym_name = ef->ddbstrtab + sym->st_name;
|
|
if (strncmp(sym_name, startn, sizeof(startn) - 1) == 0) {
|
|
start = 1;
|
|
linkset_name = sym_name + sizeof(startn) - 1;
|
|
}
|
|
else if (strncmp(sym_name, stopn, sizeof(stopn) - 1) == 0) {
|
|
start = 0;
|
|
linkset_name = sym_name + sizeof(stopn) - 1;
|
|
}
|
|
else
|
|
continue;
|
|
|
|
for (i = 0; i < ef->nprogtab; i++) {
|
|
if (strcmp(ef->progtab[i].name, linkset_name) == 0) {
|
|
startp = (Elf_Addr)ef->progtab[i].addr;
|
|
stopp = (Elf_Addr)(startp + ef->progtab[i].size);
|
|
break;
|
|
}
|
|
}
|
|
if (i == ef->nprogtab)
|
|
continue;
|
|
|
|
sym->st_value = start ? startp : stopp;
|
|
sym->st_shndx = i;
|
|
}
|
|
}
|
|
|
|
static int
|
|
link_elf_reloc_local(linker_file_t lf, bool ifuncs)
|
|
{
|
|
elf_file_t ef = (elf_file_t)lf;
|
|
const Elf_Rel *rellim;
|
|
const Elf_Rel *rel;
|
|
const Elf_Rela *relalim;
|
|
const Elf_Rela *rela;
|
|
const Elf_Sym *sym;
|
|
Elf_Addr base;
|
|
int i;
|
|
Elf_Size symidx;
|
|
|
|
link_elf_fix_link_set(ef);
|
|
|
|
/* Perform relocations without addend if there are any: */
|
|
for (i = 0; i < ef->nreltab; i++) {
|
|
rel = ef->reltab[i].rel;
|
|
if (rel == NULL) {
|
|
link_elf_error(ef->lf.filename, "lost a reltab");
|
|
return (ENOEXEC);
|
|
}
|
|
rellim = rel + ef->reltab[i].nrel;
|
|
base = findbase(ef, ef->reltab[i].sec);
|
|
if (base == 0) {
|
|
link_elf_error(ef->lf.filename, "lost base for reltab");
|
|
return (ENOEXEC);
|
|
}
|
|
for ( ; rel < rellim; rel++) {
|
|
symidx = ELF_R_SYM(rel->r_info);
|
|
if (symidx >= ef->ddbsymcnt)
|
|
continue;
|
|
sym = ef->ddbsymtab + symidx;
|
|
/* Only do local relocs */
|
|
if (ELF_ST_BIND(sym->st_info) != STB_LOCAL)
|
|
continue;
|
|
if ((ELF_ST_TYPE(sym->st_info) == STT_GNU_IFUNC ||
|
|
elf_is_ifunc_reloc(rel->r_info)) != ifuncs)
|
|
continue;
|
|
if (elf_reloc_local(lf, base, rel, ELF_RELOC_REL,
|
|
elf_obj_lookup) != 0)
|
|
return (ENOEXEC);
|
|
}
|
|
}
|
|
|
|
/* Perform relocations with addend if there are any: */
|
|
for (i = 0; i < ef->nrelatab; i++) {
|
|
rela = ef->relatab[i].rela;
|
|
if (rela == NULL) {
|
|
link_elf_error(ef->lf.filename, "lost a relatab!");
|
|
return (ENOEXEC);
|
|
}
|
|
relalim = rela + ef->relatab[i].nrela;
|
|
base = findbase(ef, ef->relatab[i].sec);
|
|
if (base == 0) {
|
|
link_elf_error(ef->lf.filename, "lost base for reltab");
|
|
return (ENOEXEC);
|
|
}
|
|
for ( ; rela < relalim; rela++) {
|
|
symidx = ELF_R_SYM(rela->r_info);
|
|
if (symidx >= ef->ddbsymcnt)
|
|
continue;
|
|
sym = ef->ddbsymtab + symidx;
|
|
/* Only do local relocs */
|
|
if (ELF_ST_BIND(sym->st_info) != STB_LOCAL)
|
|
continue;
|
|
if ((ELF_ST_TYPE(sym->st_info) == STT_GNU_IFUNC ||
|
|
elf_is_ifunc_reloc(rela->r_info)) != ifuncs)
|
|
continue;
|
|
if (elf_reloc_local(lf, base, rela, ELF_RELOC_RELA,
|
|
elf_obj_lookup) != 0)
|
|
return (ENOEXEC);
|
|
}
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
static long
|
|
link_elf_symtab_get(linker_file_t lf, const Elf_Sym **symtab)
|
|
{
|
|
elf_file_t ef = (elf_file_t)lf;
|
|
|
|
*symtab = ef->ddbsymtab;
|
|
if (*symtab == NULL)
|
|
return (0);
|
|
return (ef->ddbsymcnt);
|
|
}
|
|
|
|
static long
|
|
link_elf_strtab_get(linker_file_t lf, caddr_t *strtab)
|
|
{
|
|
elf_file_t ef = (elf_file_t)lf;
|
|
|
|
*strtab = ef->ddbstrtab;
|
|
if (*strtab == NULL)
|
|
return (0);
|
|
return (ef->ddbstrcnt);
|
|
}
|