668 lines
17 KiB
C
668 lines
17 KiB
C
/*-
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* Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
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* Copyright (c) 1998 Peter Wemm <peter@freebsd.org>
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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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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/exec.h>
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#include <sys/reboot.h>
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#include <sys/linker.h>
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#include <sys/module.h>
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#include <string.h>
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#include <machine/bootinfo.h>
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#include <machine/elf.h>
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#include <stand.h>
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#define FREEBSD_ELF
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#include <link.h>
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#include "bootstrap.h"
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#define COPYOUT(s,d,l) archsw.arch_copyout((vm_offset_t)(s), d, l)
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typedef struct elf_file {
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Elf_Phdr *ph;
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Elf_Ehdr *ehdr;
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Elf_Sym *symtab;
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Elf_Off *hashtab;
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Elf_Off nbuckets;
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Elf_Off nchains;
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Elf_Off* buckets;
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Elf_Off* chains;
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char *strtab;
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size_t strsz;
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int fd;
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caddr_t firstpage;
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size_t firstlen;
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int kernel;
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vm_offset_t off;
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} *elf_file_t;
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static int elf_loadimage(struct preloaded_file *mp, elf_file_t ef, vm_offset_t loadaddr);
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static int elf_lookup_symbol(struct preloaded_file *mp, elf_file_t ef, const char* name, Elf_Sym* sym);
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static int elf_parse_modmetadata(struct preloaded_file *mp, elf_file_t ef);
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static char *fake_modname(const char *name);
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const char *elf_kerneltype = "elf kernel";
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const char *elf_moduletype = "elf module";
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/*
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* Attempt to load the file (file) as an ELF module. It will be stored at
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* (dest), and a pointer to a module structure describing the loaded object
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* will be saved in (result).
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*/
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int
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elf_loadfile(char *filename, vm_offset_t dest, struct preloaded_file **result)
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{
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struct preloaded_file *fp, *kfp;
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struct elf_file ef;
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Elf_Ehdr *ehdr;
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int err;
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u_int pad;
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char *s;
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ssize_t bytes_read;
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fp = NULL;
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bzero(&ef, sizeof(struct elf_file));
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/*
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* Open the image, read and validate the ELF header
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*/
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if (filename == NULL) /* can't handle nameless */
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return(EFTYPE);
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if ((ef.fd = open(filename, O_RDONLY)) == -1)
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return(errno);
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ef.firstpage = malloc(PAGE_SIZE);
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if (ef.firstpage == NULL) {
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close(ef.fd);
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return(ENOMEM);
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}
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bytes_read = read(ef.fd, ef.firstpage, PAGE_SIZE);
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ef.firstlen = (size_t)bytes_read;
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if (bytes_read < 0 || ef.firstlen <= sizeof(Elf_Ehdr)) {
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err = EFTYPE; /* could be EIO, but may be small file */
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goto oerr;
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}
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ehdr = ef.ehdr = (Elf_Ehdr *)ef.firstpage;
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/* Is it ELF? */
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if (!IS_ELF(*ehdr)) {
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err = EFTYPE;
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goto oerr;
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}
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if (ehdr->e_ident[EI_CLASS] != ELF_TARG_CLASS || /* Layout ? */
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ehdr->e_ident[EI_DATA] != ELF_TARG_DATA ||
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ehdr->e_ident[EI_VERSION] != EV_CURRENT || /* Version ? */
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ehdr->e_version != EV_CURRENT ||
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ehdr->e_machine != ELF_TARG_MACH) { /* Machine ? */
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err = EFTYPE;
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goto oerr;
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}
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/*
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* Check to see what sort of module we are.
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*/
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kfp = file_findfile(NULL, NULL);
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if (ehdr->e_type == ET_DYN) {
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/* Looks like a kld module */
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if (kfp == NULL) {
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printf("elf_loadfile: can't load module before kernel\n");
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err = EPERM;
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goto oerr;
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}
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if (strcmp(elf_kerneltype, kfp->f_type)) {
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printf("elf_loadfile: can't load module with kernel type '%s'\n", kfp->f_type);
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err = EPERM;
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goto oerr;
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}
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/* Looks OK, got ahead */
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ef.kernel = 0;
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/* Page-align the load address */
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pad = (u_int)dest & PAGE_MASK;
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if (pad != 0) {
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pad = PAGE_SIZE - pad;
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dest += pad;
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}
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} else if (ehdr->e_type == ET_EXEC) {
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/* Looks like a kernel */
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if (kfp != NULL) {
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printf("elf_loadfile: kernel already loaded\n");
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err = EPERM;
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goto oerr;
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}
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/*
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* Calculate destination address based on kernel entrypoint
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*/
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dest = (vm_offset_t) ehdr->e_entry;
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if (dest == 0) {
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printf("elf_loadfile: not a kernel (maybe static binary?)\n");
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err = EPERM;
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goto oerr;
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}
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ef.kernel = 1;
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} else {
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err = EFTYPE;
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goto oerr;
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}
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/*
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* Ok, we think we should handle this.
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*/
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fp = file_alloc();
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if (fp == NULL) {
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printf("elf_loadfile: cannot allocate module info\n");
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err = EPERM;
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goto out;
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}
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if (ef.kernel)
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setenv("kernelname", filename, 1);
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s = strrchr(filename, '/');
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if (s)
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fp->f_name = strdup(s + 1);
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else
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fp->f_name = strdup(filename);
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fp->f_type = strdup(ef.kernel ? elf_kerneltype : elf_moduletype);
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#ifdef ELF_VERBOSE
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if (ef.kernel)
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printf("%s entry at %p\n", filename, (void *) dest);
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#else
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printf("%s ", filename);
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#endif
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fp->f_size = elf_loadimage(fp, &ef, dest);
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if (fp->f_size == 0 || fp->f_addr == 0)
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goto ioerr;
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/* save exec header as metadata */
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file_addmetadata(fp, MODINFOMD_ELFHDR, sizeof(*ehdr), ehdr);
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/* Load OK, return module pointer */
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*result = (struct preloaded_file *)fp;
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err = 0;
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goto out;
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ioerr:
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err = EIO;
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oerr:
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file_discard(fp);
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out:
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if (ef.firstpage)
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free(ef.firstpage);
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close(ef.fd);
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return(err);
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}
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/*
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* With the file (fd) open on the image, and (ehdr) containing
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* the Elf header, load the image at (off)
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*/
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static int
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elf_loadimage(struct preloaded_file *fp, elf_file_t ef, vm_offset_t off)
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{
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int i;
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u_int j;
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Elf_Ehdr *ehdr;
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Elf_Phdr *phdr, *php;
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Elf_Shdr *shdr;
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int ret;
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vm_offset_t firstaddr;
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vm_offset_t lastaddr;
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void *buf;
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size_t resid, chunk;
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ssize_t result;
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vm_offset_t dest;
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vm_offset_t ssym, esym;
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Elf_Dyn *dp;
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int ndp;
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char *s;
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int symstrindex;
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int symtabindex;
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long size;
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u_int fpcopy;
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dp = NULL;
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shdr = NULL;
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ret = 0;
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firstaddr = lastaddr = 0;
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ehdr = ef->ehdr;
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if (ef->kernel) {
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#ifdef __i386__
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off = - (off & 0xff000000u); /* i386 relocates after locore */
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#else
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off = 0; /* alpha is direct mapped for kernels */
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#endif
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}
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ef->off = off;
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if ((ehdr->e_phoff + ehdr->e_phnum * sizeof(*phdr)) > ef->firstlen) {
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printf("elf_loadimage: program header not within first page\n");
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goto out;
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}
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phdr = (Elf_Phdr *)(ef->firstpage + ehdr->e_phoff);
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for (i = 0; i < ehdr->e_phnum; i++) {
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/* We want to load PT_LOAD segments only.. */
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if (phdr[i].p_type != PT_LOAD)
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continue;
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#ifdef ELF_VERBOSE
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printf("Segment: 0x%lx@0x%lx -> 0x%lx-0x%lx",
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(long)phdr[i].p_filesz, (long)phdr[i].p_offset,
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(long)(phdr[i].p_vaddr + off),
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(long)(phdr[i].p_vaddr + off + phdr[i].p_memsz - 1));
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#else
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if ((phdr[i].p_flags & PF_W) == 0) {
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printf("text=0x%lx ", (long)phdr[i].p_filesz);
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} else {
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printf("data=0x%lx", (long)phdr[i].p_filesz);
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if (phdr[i].p_filesz < phdr[i].p_memsz)
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printf("+0x%lx", (long)(phdr[i].p_memsz -phdr[i].p_filesz));
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printf(" ");
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}
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#endif
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fpcopy = 0;
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if (ef->firstlen > phdr[i].p_offset) {
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fpcopy = ef->firstlen - phdr[i].p_offset;
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archsw.arch_copyin(ef->firstpage + phdr[i].p_offset,
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phdr[i].p_vaddr + off, fpcopy);
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}
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if (phdr[i].p_filesz > fpcopy) {
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if (lseek(ef->fd, (off_t)(phdr[i].p_offset + fpcopy),
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SEEK_SET) == -1) {
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printf("\nelf_loadexec: cannot seek\n");
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goto out;
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}
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if (archsw.arch_readin(ef->fd, phdr[i].p_vaddr + off + fpcopy,
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phdr[i].p_filesz - fpcopy) != (ssize_t)(phdr[i].p_filesz - fpcopy)) {
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printf("\nelf_loadexec: archsw.readin failed\n");
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goto out;
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}
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}
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/* clear space from oversized segments; eg: bss */
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if (phdr[i].p_filesz < phdr[i].p_memsz) {
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#ifdef ELF_VERBOSE
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printf(" (bss: 0x%lx-0x%lx)",
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(long)(phdr[i].p_vaddr + off + phdr[i].p_filesz),
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(long)(phdr[i].p_vaddr + off + phdr[i].p_memsz - 1));
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#endif
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/* no archsw.arch_bzero */
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buf = malloc(PAGE_SIZE);
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if (buf == NULL) {
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printf("\nelf_loadimage: malloc() failed\n");
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goto out;
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}
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bzero(buf, PAGE_SIZE);
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resid = phdr[i].p_memsz - phdr[i].p_filesz;
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dest = phdr[i].p_vaddr + off + phdr[i].p_filesz;
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while (resid > 0) {
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chunk = min(PAGE_SIZE, resid);
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archsw.arch_copyin(buf, dest, chunk);
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resid -= chunk;
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dest += chunk;
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}
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free(buf);
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}
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#ifdef ELF_VERBOSE
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printf("\n");
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#endif
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if (firstaddr == 0 || firstaddr > (phdr[i].p_vaddr + off))
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firstaddr = phdr[i].p_vaddr + off;
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if (lastaddr == 0 || lastaddr < (phdr[i].p_vaddr + off + phdr[i].p_memsz))
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lastaddr = phdr[i].p_vaddr + off + phdr[i].p_memsz;
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}
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lastaddr = roundup(lastaddr, sizeof(long));
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/*
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* Now grab the symbol tables. This isn't easy if we're reading a
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* .gz file. I think the rule is going to have to be that you must
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* strip a file to remove symbols before gzipping it so that we do not
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* try to lseek() on it.
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*/
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chunk = ehdr->e_shnum * ehdr->e_shentsize;
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if (chunk == 0 || ehdr->e_shoff == 0)
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goto nosyms;
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shdr = malloc(chunk);
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if (shdr == NULL)
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goto nosyms;
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if (lseek(ef->fd, (off_t)ehdr->e_shoff, SEEK_SET) == -1) {
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printf("\nelf_loadimage: cannot lseek() to section headers");
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goto nosyms;
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}
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result = read(ef->fd, shdr, chunk);
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if (result < 0 || (size_t)result != chunk) {
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printf("\nelf_loadimage: read section headers failed");
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goto nosyms;
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}
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symtabindex = -1;
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symstrindex = -1;
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for (i = 0; i < ehdr->e_shnum; i++) {
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if (shdr[i].sh_type != SHT_SYMTAB)
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continue;
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for (j = 0; j < ehdr->e_phnum; j++) {
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if (phdr[j].p_type != PT_LOAD)
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continue;
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if (shdr[i].sh_offset >= phdr[j].p_offset &&
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(shdr[i].sh_offset + shdr[i].sh_size <=
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phdr[j].p_offset + phdr[j].p_filesz)) {
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shdr[i].sh_offset = 0;
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shdr[i].sh_size = 0;
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break;
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}
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}
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if (shdr[i].sh_offset == 0 || shdr[i].sh_size == 0)
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continue; /* alread loaded in a PT_LOAD above */
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/* Save it for loading below */
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symtabindex = i;
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symstrindex = shdr[i].sh_link;
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}
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if (symtabindex < 0 || symstrindex < 0)
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goto nosyms;
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/* Ok, committed to a load. */
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#ifndef ELF_VERBOSE
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printf("syms=[");
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#endif
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ssym = lastaddr;
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for (i = symtabindex; i >= 0; i = symstrindex) {
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#ifdef ELF_VERBOSE
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char *secname;
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switch(shdr[i].sh_type) {
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case SHT_SYMTAB: /* Symbol table */
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secname = "symtab";
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break;
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case SHT_STRTAB: /* String table */
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secname = "strtab";
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break;
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default:
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secname = "WHOA!!";
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break;
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}
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#endif
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size = shdr[i].sh_size;
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archsw.arch_copyin(&size, lastaddr, sizeof(size));
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lastaddr += sizeof(long);
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#ifdef ELF_VERBOSE
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printf("\n%s: 0x%lx@0x%lx -> 0x%lx-0x%lx", secname,
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shdr[i].sh_size, shdr[i].sh_offset,
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lastaddr, lastaddr + shdr[i].sh_size);
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#else
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if (i == symstrindex)
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printf("+");
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printf("0x%lx+0x%lx", (long)sizeof(size), size);
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#endif
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if (lseek(ef->fd, (off_t)shdr[i].sh_offset, SEEK_SET) == -1) {
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printf("\nelf_loadimage: could not seek for symbols - skipped!");
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lastaddr = ssym;
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ssym = 0;
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goto nosyms;
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}
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result = archsw.arch_readin(ef->fd, lastaddr, shdr[i].sh_size);
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if (result < 0 || (size_t)result != shdr[i].sh_size) {
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printf("\nelf_loadimage: could not read symbols - skipped!");
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lastaddr = ssym;
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ssym = 0;
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goto nosyms;
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}
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/* Reset offsets relative to ssym */
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lastaddr += shdr[i].sh_size;
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lastaddr = roundup(lastaddr, sizeof(long));
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if (i == symtabindex)
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symtabindex = -1;
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else if (i == symstrindex)
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symstrindex = -1;
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}
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esym = lastaddr;
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#ifndef ELF_VERBOSE
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printf("]");
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#endif
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file_addmetadata(fp, MODINFOMD_SSYM, sizeof(ssym), &ssym);
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file_addmetadata(fp, MODINFOMD_ESYM, sizeof(esym), &esym);
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nosyms:
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printf("\n");
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ret = lastaddr - firstaddr;
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fp->f_addr = firstaddr;
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php = NULL;
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for (i = 0; i < ehdr->e_phnum; i++) {
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if (phdr[i].p_type == PT_DYNAMIC) {
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php = phdr + i;
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dp = (Elf_Dyn *)(php->p_vaddr);
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file_addmetadata(fp, MODINFOMD_DYNAMIC, sizeof(dp), &dp);
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dp = NULL;
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break;
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}
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}
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if (php == NULL) /* this is bad, we cannot get to symbols or _DYNAMIC */
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goto out;
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ndp = php->p_filesz / sizeof(Elf_Dyn);
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if (ndp == 0)
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goto out;
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dp = malloc(php->p_filesz);
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if (dp == NULL)
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goto out;
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archsw.arch_copyout(php->p_vaddr + off, dp, php->p_filesz);
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ef->strsz = 0;
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for (i = 0; i < ndp; i++) {
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if (dp[i].d_tag == NULL)
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break;
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switch (dp[i].d_tag) {
|
|
case DT_HASH:
|
|
ef->hashtab = (Elf_Off*)(dp[i].d_un.d_ptr + off);
|
|
break;
|
|
case DT_STRTAB:
|
|
ef->strtab = (char *)(dp[i].d_un.d_ptr + off);
|
|
break;
|
|
case DT_STRSZ:
|
|
ef->strsz = dp[i].d_un.d_val;
|
|
break;
|
|
case DT_SYMTAB:
|
|
ef->symtab = (Elf_Sym*)(dp[i].d_un.d_ptr + off);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
if (ef->hashtab == NULL || ef->symtab == NULL ||
|
|
ef->strtab == NULL || ef->strsz == 0)
|
|
goto out;
|
|
COPYOUT(ef->hashtab, &ef->nbuckets, sizeof(ef->nbuckets));
|
|
COPYOUT(ef->hashtab + 1, &ef->nchains, sizeof(ef->nchains));
|
|
ef->buckets = ef->hashtab + 2;
|
|
ef->chains = ef->buckets + ef->nbuckets;
|
|
if (elf_parse_modmetadata(fp, ef) == 0)
|
|
goto out;
|
|
|
|
if (ef->kernel) /* kernel must not depend on anything */
|
|
goto out;
|
|
|
|
for (i = 0; i < ndp; i++) {
|
|
if (dp[i].d_tag == NULL)
|
|
break;
|
|
if (dp[i].d_tag != DT_NEEDED)
|
|
continue;
|
|
j = dp[i].d_un.d_ptr;
|
|
if (j < 1 || j > ef->strsz - 2)
|
|
continue;
|
|
s = strdupout((vm_offset_t)&ef->strtab[j]);
|
|
file_addmetadata(fp, MODINFOMD_DEPLIST, strlen(s) + 1, s);
|
|
free(s);
|
|
}
|
|
|
|
out:
|
|
if (dp)
|
|
free(dp);
|
|
if (shdr)
|
|
free(shdr);
|
|
return ret;
|
|
}
|
|
|
|
static char invalid_name[] = "bad";
|
|
char *
|
|
fake_modname(const char *name)
|
|
{
|
|
char *sp, *ep;
|
|
size_t len;
|
|
|
|
sp = strrchr(name, '/');
|
|
if (sp)
|
|
sp++;
|
|
else
|
|
sp = name;
|
|
ep = strrchr(name, '.');
|
|
if (ep) {
|
|
if (ep == name) {
|
|
sp = invalid_name;
|
|
ep = invalid_name + sizeof(invalid_name) - 1;
|
|
}
|
|
} else
|
|
ep = name + strlen(name);
|
|
len = ep - sp;
|
|
ep = malloc(len + 1);
|
|
if (ep == NULL)
|
|
return NULL;
|
|
memcpy(ep, sp, len);
|
|
ep[len] = '\0';
|
|
return ep;
|
|
}
|
|
|
|
int
|
|
elf_parse_modmetadata(struct preloaded_file *fp, elf_file_t ef)
|
|
{
|
|
struct mod_metadata md;
|
|
Elf_Sym sym;
|
|
char *s, *v, **p, **p_stop;
|
|
int modcnt;
|
|
|
|
if (elf_lookup_symbol(fp, ef, "__start_set_modmetadata_set", &sym) != 0)
|
|
return ENOENT;
|
|
p = (char **)(sym.st_value + ef->off);
|
|
if (elf_lookup_symbol(fp, ef, "__stop_set_modmetadata_set", &sym) != 0)
|
|
return ENOENT;
|
|
p_stop = (char **)(sym.st_value + ef->off);
|
|
|
|
modcnt = 0;
|
|
while (p < p_stop) {
|
|
COPYOUT(p++, &v, sizeof(v));
|
|
COPYOUT(v + ef->off, &md, sizeof(md));
|
|
switch(md.md_type) {
|
|
case MDT_DEPEND:
|
|
if (ef->kernel) /* kernel must not depend on anything */
|
|
break;
|
|
s = strdupout((vm_offset_t)(md.md_cval + ef->off));
|
|
file_addmetadata(fp, MODINFOMD_DEPLIST, strlen(s) + 1, s);
|
|
free(s);
|
|
break;
|
|
case MDT_VERSION:
|
|
s = strdupout((vm_offset_t)(md.md_cval + ef->off));
|
|
file_addmodule(fp, s, NULL);
|
|
free(s);
|
|
modcnt++;
|
|
break;
|
|
}
|
|
}
|
|
if (modcnt == 0) {
|
|
s = fake_modname(fp->f_name);
|
|
file_addmodule(fp, s, NULL);
|
|
free(s);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static unsigned long
|
|
elf_hash(const char *name)
|
|
{
|
|
const unsigned char *p = (const unsigned char *) name;
|
|
unsigned long h = 0;
|
|
unsigned long g;
|
|
|
|
while (*p != '\0') {
|
|
h = (h << 4) + *p++;
|
|
if ((g = h & 0xf0000000) != 0)
|
|
h ^= g >> 24;
|
|
h &= ~g;
|
|
}
|
|
return h;
|
|
}
|
|
|
|
static const char elf_bad_symtable[] = "elf_lookup_symbol: corrupt symbol table\n";
|
|
int
|
|
elf_lookup_symbol(struct preloaded_file *fp, elf_file_t ef, const char* name,
|
|
Elf_Sym *symp)
|
|
{
|
|
unsigned long symnum;
|
|
Elf_Sym sym;
|
|
char *strp;
|
|
unsigned long hash;
|
|
|
|
hash = elf_hash(name);
|
|
COPYOUT(&ef->buckets[hash % ef->nbuckets], &symnum, sizeof(symnum));
|
|
|
|
while (symnum != STN_UNDEF) {
|
|
if (symnum >= ef->nchains) {
|
|
printf(elf_bad_symtable);
|
|
return ENOENT;
|
|
}
|
|
|
|
COPYOUT(ef->symtab + symnum, &sym, sizeof(sym));
|
|
if (sym.st_name == 0) {
|
|
printf(elf_bad_symtable);
|
|
return ENOENT;
|
|
}
|
|
|
|
strp = strdupout((vm_offset_t)(ef->strtab + sym.st_name));
|
|
if (strcmp(name, strp) == 0) {
|
|
free(strp);
|
|
if (sym.st_shndx != SHN_UNDEF ||
|
|
(sym.st_value != 0 &&
|
|
ELF_ST_TYPE(sym.st_info) == STT_FUNC)) {
|
|
*symp = sym;
|
|
return 0;
|
|
}
|
|
return ENOENT;
|
|
}
|
|
free(strp);
|
|
COPYOUT(&ef->chains[symnum], &symnum, sizeof(symnum));
|
|
}
|
|
return ENOENT;
|
|
}
|