df560e4e96
Use the proper types in parse_modmetadata for the p_start and p_end parameters. This was causing problems in the ARM 32bit loader. Sponsored by: Citrix Systems R&D Reported and Tested by: ian
1020 lines
27 KiB
C
1020 lines
27 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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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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/linker.h>
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#include <sys/module.h>
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#include <sys/stdint.h>
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#include <string.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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|
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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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#if defined(__i386__) && __ELF_WORD_SIZE == 64
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#undef ELF_TARG_CLASS
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#undef ELF_TARG_MACH
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#define ELF_TARG_CLASS ELFCLASS64
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#define ELF_TARG_MACH EM_X86_64
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#endif
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|
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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_Hashelt *hashtab;
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Elf_Hashelt nbuckets;
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|
Elf_Hashelt nchains;
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|
Elf_Hashelt *buckets;
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|
Elf_Hashelt *chains;
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|
Elf_Rel *rel;
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|
size_t relsz;
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|
Elf_Rela *rela;
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|
size_t relasz;
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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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u_int64_t off;
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} *elf_file_t;
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|
|
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static int __elfN(loadimage)(struct preloaded_file *mp, elf_file_t ef, u_int64_t loadaddr);
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static int __elfN(lookup_symbol)(struct preloaded_file *mp, elf_file_t ef, const char* name, Elf_Sym* sym);
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static int __elfN(reloc_ptr)(struct preloaded_file *mp, elf_file_t ef,
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Elf_Addr p, void *val, size_t len);
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static int __elfN(parse_modmetadata)(struct preloaded_file *mp, elf_file_t ef,
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Elf_Addr p_start, Elf_Addr p_end);
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static symaddr_fn __elfN(symaddr);
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static char *fake_modname(const char *name);
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const char *__elfN(kerneltype) = "elf kernel";
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const char *__elfN(moduletype) = "elf module";
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u_int64_t __elfN(relocation_offset) = 0;
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static int
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__elfN(load_elf_header)(char *filename, elf_file_t ef)
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|
{
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ssize_t bytes_read;
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Elf_Ehdr *ehdr;
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int err;
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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 error;
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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 error;
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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 error;
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}
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return (0);
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error:
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if (ef->firstpage != NULL) {
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free(ef->firstpage);
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ef->firstpage = NULL;
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}
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if (ef->fd != -1) {
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close(ef->fd);
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ef->fd = -1;
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}
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return (err);
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}
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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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__elfN(loadfile)(char *filename, u_int64_t dest, struct preloaded_file **result)
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{
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return (__elfN(loadfile_raw)(filename, dest, result, 0));
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}
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int
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__elfN(loadfile_raw)(char *filename, u_int64_t dest,
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struct preloaded_file **result, int multiboot)
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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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fp = NULL;
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bzero(&ef, sizeof(struct elf_file));
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ef.fd = -1;
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err = __elfN(load_elf_header)(filename, &ef);
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if (err != 0)
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return (err);
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ehdr = ef.ehdr;
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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, __elfN(kerneltype));
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if (ehdr->e_type == ET_DYN) {
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/* Looks like a kld module */
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if (multiboot != 0) {
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printf("elf" __XSTRING(__ELF_WORD_SIZE) "_loadfile: can't load module as multiboot\n");
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err = EPERM;
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goto oerr;
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}
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if (kfp == NULL) {
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printf("elf" __XSTRING(__ELF_WORD_SIZE) "_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(__elfN(kerneltype), kfp->f_type)) {
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printf("elf" __XSTRING(__ELF_WORD_SIZE) "_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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} 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" __XSTRING(__ELF_WORD_SIZE) "_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 = (ehdr->e_entry & ~PAGE_MASK);
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if (dest == 0) {
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printf("elf" __XSTRING(__ELF_WORD_SIZE) "_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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if (archsw.arch_loadaddr != NULL)
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dest = archsw.arch_loadaddr(LOAD_ELF, ehdr, dest);
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else
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dest = roundup(dest, PAGE_SIZE);
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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" __XSTRING(__ELF_WORD_SIZE) "_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 == 1 && multiboot == 0)
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setenv("kernelname", filename, 1);
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fp->f_name = strdup(filename);
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if (multiboot == 0)
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fp->f_type = strdup(ef.kernel ?
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__elfN(kerneltype) : __elfN(moduletype));
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else
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fp->f_type = strdup("elf multiboot kernel");
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#ifdef ELF_VERBOSE
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if (ef.kernel)
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printf("%s entry at 0x%jx\n", filename, (uintmax_t)ehdr->e_entry);
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#else
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printf("%s ", filename);
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#endif
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fp->f_size = __elfN(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;
|
|
|
|
ioerr:
|
|
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)
|
|
free(ef.firstpage);
|
|
if (ef.fd != -1)
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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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|
*/
|
|
static int
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__elfN(loadimage)(struct preloaded_file *fp, elf_file_t ef, u_int64_t off)
|
|
{
|
|
int i;
|
|
u_int j;
|
|
Elf_Ehdr *ehdr;
|
|
Elf_Phdr *phdr, *php;
|
|
Elf_Shdr *shdr;
|
|
char *shstr;
|
|
int ret;
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|
vm_offset_t firstaddr;
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|
vm_offset_t lastaddr;
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|
size_t chunk;
|
|
ssize_t result;
|
|
Elf_Addr ssym, esym;
|
|
Elf_Dyn *dp;
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|
Elf_Addr adp;
|
|
Elf_Addr ctors;
|
|
int ndp;
|
|
int symstrindex;
|
|
int symtabindex;
|
|
Elf_Size size;
|
|
u_int fpcopy;
|
|
Elf_Sym sym;
|
|
Elf_Addr p_start, p_end;
|
|
|
|
dp = NULL;
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|
shdr = NULL;
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|
ret = 0;
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|
firstaddr = lastaddr = 0;
|
|
ehdr = ef->ehdr;
|
|
if (ef->kernel) {
|
|
#if defined(__i386__) || defined(__amd64__)
|
|
#if __ELF_WORD_SIZE == 64
|
|
off = - (off & 0xffffffffff000000ull);/* x86_64 relocates after locore */
|
|
#else
|
|
off = - (off & 0xff000000u); /* i386 relocates after locore */
|
|
#endif
|
|
#elif defined(__powerpc__)
|
|
/*
|
|
* On the purely virtual memory machines like e500, the kernel is
|
|
* linked against its final VA range, which is most often not
|
|
* available at the loader stage, but only after kernel initializes
|
|
* and completes its VM settings. In such cases we cannot use p_vaddr
|
|
* field directly to load ELF segments, but put them at some
|
|
* 'load-time' locations.
|
|
*/
|
|
if (off & 0xf0000000u) {
|
|
off = -(off & 0xf0000000u);
|
|
/*
|
|
* XXX the physical load address should not be hardcoded. Note
|
|
* that the Book-E kernel assumes that it's loaded at a 16MB
|
|
* boundary for now...
|
|
*/
|
|
off += 0x01000000;
|
|
ehdr->e_entry += off;
|
|
#ifdef ELF_VERBOSE
|
|
printf("Converted entry 0x%08x\n", ehdr->e_entry);
|
|
#endif
|
|
} else
|
|
off = 0;
|
|
#elif defined(__arm__)
|
|
/*
|
|
* The elf headers in some kernels specify virtual addresses in all
|
|
* header fields. More recently, the e_entry and p_paddr fields are the
|
|
* proper physical addresses. Even when the p_paddr fields are correct,
|
|
* the MI code below uses the p_vaddr fields with an offset added for
|
|
* loading (doing so is arguably wrong). To make loading work, we need
|
|
* an offset that represents the difference between physical and virtual
|
|
* addressing. ARM kernels are always linked at 0xCnnnnnnn. Depending
|
|
* on the headers, the offset value passed in may be physical or virtual
|
|
* (because it typically comes from e_entry), but we always replace
|
|
* whatever is passed in with the va<->pa offset. On the other hand, we
|
|
* always remove the high-order part of the entry address whether it's
|
|
* physical or virtual, because it will be adjusted later for the actual
|
|
* physical entry point based on where the image gets loaded.
|
|
*/
|
|
off = -0xc0000000;
|
|
ehdr->e_entry &= ~0xf0000000;
|
|
#ifdef ELF_VERBOSE
|
|
printf("ehdr->e_entry 0x%08x, va<->pa off %llx\n", ehdr->e_entry, off);
|
|
#endif
|
|
#else
|
|
off = 0; /* other archs use direct mapped kernels */
|
|
#endif
|
|
__elfN(relocation_offset) = off;
|
|
}
|
|
ef->off = off;
|
|
|
|
if ((ehdr->e_phoff + ehdr->e_phnum * sizeof(*phdr)) > ef->firstlen) {
|
|
printf("elf" __XSTRING(__ELF_WORD_SIZE) "_loadimage: program header not within first page\n");
|
|
goto out;
|
|
}
|
|
phdr = (Elf_Phdr *)(ef->firstpage + ehdr->e_phoff);
|
|
|
|
for (i = 0; i < ehdr->e_phnum; i++) {
|
|
/* We want to load PT_LOAD segments only.. */
|
|
if (phdr[i].p_type != PT_LOAD)
|
|
continue;
|
|
|
|
#ifdef ELF_VERBOSE
|
|
printf("Segment: 0x%lx@0x%lx -> 0x%lx-0x%lx",
|
|
(long)phdr[i].p_filesz, (long)phdr[i].p_offset,
|
|
(long)(phdr[i].p_vaddr + off),
|
|
(long)(phdr[i].p_vaddr + off + phdr[i].p_memsz - 1));
|
|
#else
|
|
if ((phdr[i].p_flags & PF_W) == 0) {
|
|
printf("text=0x%lx ", (long)phdr[i].p_filesz);
|
|
} else {
|
|
printf("data=0x%lx", (long)phdr[i].p_filesz);
|
|
if (phdr[i].p_filesz < phdr[i].p_memsz)
|
|
printf("+0x%lx", (long)(phdr[i].p_memsz -phdr[i].p_filesz));
|
|
printf(" ");
|
|
}
|
|
#endif
|
|
fpcopy = 0;
|
|
if (ef->firstlen > phdr[i].p_offset) {
|
|
fpcopy = ef->firstlen - phdr[i].p_offset;
|
|
archsw.arch_copyin(ef->firstpage + phdr[i].p_offset,
|
|
phdr[i].p_vaddr + off, fpcopy);
|
|
}
|
|
if (phdr[i].p_filesz > fpcopy) {
|
|
if (kern_pread(ef->fd, phdr[i].p_vaddr + off + fpcopy,
|
|
phdr[i].p_filesz - fpcopy, phdr[i].p_offset + fpcopy) != 0) {
|
|
printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
|
|
"_loadimage: read failed\n");
|
|
goto out;
|
|
}
|
|
}
|
|
/* clear space from oversized segments; eg: bss */
|
|
if (phdr[i].p_filesz < phdr[i].p_memsz) {
|
|
#ifdef ELF_VERBOSE
|
|
printf(" (bss: 0x%lx-0x%lx)",
|
|
(long)(phdr[i].p_vaddr + off + phdr[i].p_filesz),
|
|
(long)(phdr[i].p_vaddr + off + phdr[i].p_memsz - 1));
|
|
#endif
|
|
|
|
kern_bzero(phdr[i].p_vaddr + off + phdr[i].p_filesz,
|
|
phdr[i].p_memsz - phdr[i].p_filesz);
|
|
}
|
|
#ifdef ELF_VERBOSE
|
|
printf("\n");
|
|
#endif
|
|
|
|
if (archsw.arch_loadseg != NULL)
|
|
archsw.arch_loadseg(ehdr, phdr + i, off);
|
|
|
|
if (firstaddr == 0 || firstaddr > (phdr[i].p_vaddr + off))
|
|
firstaddr = phdr[i].p_vaddr + off;
|
|
if (lastaddr == 0 || lastaddr < (phdr[i].p_vaddr + off + phdr[i].p_memsz))
|
|
lastaddr = phdr[i].p_vaddr + off + phdr[i].p_memsz;
|
|
}
|
|
lastaddr = roundup(lastaddr, sizeof(long));
|
|
|
|
/*
|
|
* Get the section headers. We need this for finding the .ctors
|
|
* section as well as for loading any symbols. Both may be hard
|
|
* to do if reading from a .gz file as it involves seeking. I
|
|
* think the rule is going to have to be that you must strip a
|
|
* file to remove symbols before gzipping it.
|
|
*/
|
|
chunk = ehdr->e_shnum * ehdr->e_shentsize;
|
|
if (chunk == 0 || ehdr->e_shoff == 0)
|
|
goto nosyms;
|
|
shdr = alloc_pread(ef->fd, ehdr->e_shoff, chunk);
|
|
if (shdr == NULL) {
|
|
printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
|
|
"_loadimage: failed to read section headers");
|
|
goto nosyms;
|
|
}
|
|
file_addmetadata(fp, MODINFOMD_SHDR, chunk, shdr);
|
|
|
|
/*
|
|
* Read the section string table and look for the .ctors section.
|
|
* We need to tell the kernel where it is so that it can call the
|
|
* ctors.
|
|
*/
|
|
chunk = shdr[ehdr->e_shstrndx].sh_size;
|
|
if (chunk) {
|
|
shstr = alloc_pread(ef->fd, shdr[ehdr->e_shstrndx].sh_offset, chunk);
|
|
if (shstr) {
|
|
for (i = 0; i < ehdr->e_shnum; i++) {
|
|
if (strcmp(shstr + shdr[i].sh_name, ".ctors") != 0)
|
|
continue;
|
|
ctors = shdr[i].sh_addr;
|
|
file_addmetadata(fp, MODINFOMD_CTORS_ADDR, sizeof(ctors),
|
|
&ctors);
|
|
size = shdr[i].sh_size;
|
|
file_addmetadata(fp, MODINFOMD_CTORS_SIZE, sizeof(size),
|
|
&size);
|
|
break;
|
|
}
|
|
free(shstr);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Now load any symbols.
|
|
*/
|
|
symtabindex = -1;
|
|
symstrindex = -1;
|
|
for (i = 0; i < ehdr->e_shnum; i++) {
|
|
if (shdr[i].sh_type != SHT_SYMTAB)
|
|
continue;
|
|
for (j = 0; j < ehdr->e_phnum; j++) {
|
|
if (phdr[j].p_type != PT_LOAD)
|
|
continue;
|
|
if (shdr[i].sh_offset >= phdr[j].p_offset &&
|
|
(shdr[i].sh_offset + shdr[i].sh_size <=
|
|
phdr[j].p_offset + phdr[j].p_filesz)) {
|
|
shdr[i].sh_offset = 0;
|
|
shdr[i].sh_size = 0;
|
|
break;
|
|
}
|
|
}
|
|
if (shdr[i].sh_offset == 0 || shdr[i].sh_size == 0)
|
|
continue; /* alread loaded in a PT_LOAD above */
|
|
/* Save it for loading below */
|
|
symtabindex = i;
|
|
symstrindex = shdr[i].sh_link;
|
|
}
|
|
if (symtabindex < 0 || symstrindex < 0)
|
|
goto nosyms;
|
|
|
|
/* Ok, committed to a load. */
|
|
#ifndef ELF_VERBOSE
|
|
printf("syms=[");
|
|
#endif
|
|
ssym = lastaddr;
|
|
for (i = symtabindex; i >= 0; i = symstrindex) {
|
|
#ifdef ELF_VERBOSE
|
|
char *secname;
|
|
|
|
switch(shdr[i].sh_type) {
|
|
case SHT_SYMTAB: /* Symbol table */
|
|
secname = "symtab";
|
|
break;
|
|
case SHT_STRTAB: /* String table */
|
|
secname = "strtab";
|
|
break;
|
|
default:
|
|
secname = "WHOA!!";
|
|
break;
|
|
}
|
|
#endif
|
|
|
|
size = shdr[i].sh_size;
|
|
archsw.arch_copyin(&size, lastaddr, sizeof(size));
|
|
lastaddr += sizeof(size);
|
|
|
|
#ifdef ELF_VERBOSE
|
|
printf("\n%s: 0x%jx@0x%jx -> 0x%jx-0x%jx", secname,
|
|
(uintmax_t)shdr[i].sh_size, (uintmax_t)shdr[i].sh_offset,
|
|
(uintmax_t)lastaddr, (uintmax_t)(lastaddr + shdr[i].sh_size));
|
|
#else
|
|
if (i == symstrindex)
|
|
printf("+");
|
|
printf("0x%lx+0x%lx", (long)sizeof(size), (long)size);
|
|
#endif
|
|
|
|
if (lseek(ef->fd, (off_t)shdr[i].sh_offset, SEEK_SET) == -1) {
|
|
printf("\nelf" __XSTRING(__ELF_WORD_SIZE) "_loadimage: could not seek for symbols - skipped!");
|
|
lastaddr = ssym;
|
|
ssym = 0;
|
|
goto nosyms;
|
|
}
|
|
result = archsw.arch_readin(ef->fd, lastaddr, shdr[i].sh_size);
|
|
if (result < 0 || (size_t)result != shdr[i].sh_size) {
|
|
printf("\nelf" __XSTRING(__ELF_WORD_SIZE) "_loadimage: could not read symbols - skipped! (%ju != %ju)", (uintmax_t)result,
|
|
(uintmax_t)shdr[i].sh_size);
|
|
lastaddr = ssym;
|
|
ssym = 0;
|
|
goto nosyms;
|
|
}
|
|
/* Reset offsets relative to ssym */
|
|
lastaddr += shdr[i].sh_size;
|
|
lastaddr = roundup(lastaddr, sizeof(size));
|
|
if (i == symtabindex)
|
|
symtabindex = -1;
|
|
else if (i == symstrindex)
|
|
symstrindex = -1;
|
|
}
|
|
esym = lastaddr;
|
|
#ifndef ELF_VERBOSE
|
|
printf("]");
|
|
#endif
|
|
|
|
file_addmetadata(fp, MODINFOMD_SSYM, sizeof(ssym), &ssym);
|
|
file_addmetadata(fp, MODINFOMD_ESYM, sizeof(esym), &esym);
|
|
|
|
nosyms:
|
|
printf("\n");
|
|
|
|
ret = lastaddr - firstaddr;
|
|
fp->f_addr = firstaddr;
|
|
|
|
php = NULL;
|
|
for (i = 0; i < ehdr->e_phnum; i++) {
|
|
if (phdr[i].p_type == PT_DYNAMIC) {
|
|
php = phdr + i;
|
|
adp = php->p_vaddr;
|
|
file_addmetadata(fp, MODINFOMD_DYNAMIC, sizeof(adp), &adp);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (php == NULL) /* this is bad, we cannot get to symbols or _DYNAMIC */
|
|
goto out;
|
|
|
|
ndp = php->p_filesz / sizeof(Elf_Dyn);
|
|
if (ndp == 0)
|
|
goto out;
|
|
dp = malloc(php->p_filesz);
|
|
if (dp == NULL)
|
|
goto out;
|
|
archsw.arch_copyout(php->p_vaddr + off, dp, php->p_filesz);
|
|
|
|
ef->strsz = 0;
|
|
for (i = 0; i < ndp; i++) {
|
|
if (dp[i].d_tag == 0)
|
|
break;
|
|
switch (dp[i].d_tag) {
|
|
case DT_HASH:
|
|
ef->hashtab = (Elf_Hashelt*)(uintptr_t)(dp[i].d_un.d_ptr + off);
|
|
break;
|
|
case DT_STRTAB:
|
|
ef->strtab = (char *)(uintptr_t)(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*)(uintptr_t)(dp[i].d_un.d_ptr + off);
|
|
break;
|
|
case DT_REL:
|
|
ef->rel = (Elf_Rel *)(uintptr_t)(dp[i].d_un.d_ptr + off);
|
|
break;
|
|
case DT_RELSZ:
|
|
ef->relsz = dp[i].d_un.d_val;
|
|
break;
|
|
case DT_RELA:
|
|
ef->rela = (Elf_Rela *)(uintptr_t)(dp[i].d_un.d_ptr + off);
|
|
break;
|
|
case DT_RELASZ:
|
|
ef->relasz = dp[i].d_un.d_val;
|
|
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 (__elfN(lookup_symbol)(fp, ef, "__start_set_modmetadata_set", &sym) != 0)
|
|
return 0;
|
|
p_start = sym.st_value + ef->off;
|
|
if (__elfN(lookup_symbol)(fp, ef, "__stop_set_modmetadata_set", &sym) != 0)
|
|
return ENOENT;
|
|
p_end = sym.st_value + ef->off;
|
|
|
|
if (__elfN(parse_modmetadata)(fp, ef, p_start, p_end) == 0)
|
|
goto out;
|
|
|
|
if (ef->kernel) /* kernel must not depend on anything */
|
|
goto out;
|
|
|
|
out:
|
|
if (dp)
|
|
free(dp);
|
|
if (shdr)
|
|
free(shdr);
|
|
return ret;
|
|
}
|
|
|
|
static char invalid_name[] = "bad";
|
|
|
|
char *
|
|
fake_modname(const char *name)
|
|
{
|
|
const char *sp, *ep;
|
|
char *fp;
|
|
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;
|
|
fp = malloc(len + 1);
|
|
if (fp == NULL)
|
|
return NULL;
|
|
memcpy(fp, sp, len);
|
|
fp[len] = '\0';
|
|
return fp;
|
|
}
|
|
|
|
#if (defined(__i386__) || defined(__powerpc__)) && __ELF_WORD_SIZE == 64
|
|
struct mod_metadata64 {
|
|
int md_version; /* structure version MDTV_* */
|
|
int md_type; /* type of entry MDT_* */
|
|
u_int64_t md_data; /* specific data */
|
|
u_int64_t md_cval; /* common string label */
|
|
};
|
|
#endif
|
|
#if defined(__amd64__) && __ELF_WORD_SIZE == 32
|
|
struct mod_metadata32 {
|
|
int md_version; /* structure version MDTV_* */
|
|
int md_type; /* type of entry MDT_* */
|
|
u_int32_t md_data; /* specific data */
|
|
u_int32_t md_cval; /* common string label */
|
|
};
|
|
#endif
|
|
|
|
int
|
|
__elfN(load_modmetadata)(struct preloaded_file *fp, u_int64_t dest)
|
|
{
|
|
struct elf_file ef;
|
|
int err, i, j;
|
|
Elf_Shdr *sh_meta, *shdr = NULL;
|
|
Elf_Shdr *sh_data[2];
|
|
char *shstrtab = NULL;
|
|
size_t size;
|
|
Elf_Addr p_start, p_end;
|
|
|
|
bzero(&ef, sizeof(struct elf_file));
|
|
ef.fd = -1;
|
|
|
|
err = __elfN(load_elf_header)(fp->f_name, &ef);
|
|
if (err != 0)
|
|
goto out;
|
|
|
|
if (ef.ehdr->e_type == ET_EXEC) {
|
|
ef.kernel = 1;
|
|
} else if (ef.ehdr->e_type != ET_DYN) {
|
|
err = EFTYPE;
|
|
goto out;
|
|
}
|
|
|
|
size = ef.ehdr->e_shnum * ef.ehdr->e_shentsize;
|
|
shdr = alloc_pread(ef.fd, ef.ehdr->e_shoff, size);
|
|
if (shdr == NULL) {
|
|
err = ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
/* Load shstrtab. */
|
|
shstrtab = alloc_pread(ef.fd, shdr[ef.ehdr->e_shstrndx].sh_offset,
|
|
shdr[ef.ehdr->e_shstrndx].sh_size);
|
|
if (shstrtab == NULL) {
|
|
printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
|
|
"load_modmetadata: unable to load shstrtab\n");
|
|
err = EFTYPE;
|
|
goto out;
|
|
}
|
|
|
|
/* Find set_modmetadata_set and data sections. */
|
|
sh_data[0] = sh_data[1] = sh_meta = NULL;
|
|
for (i = 0, j = 0; i < ef.ehdr->e_shnum; i++) {
|
|
if (strcmp(&shstrtab[shdr[i].sh_name],
|
|
"set_modmetadata_set") == 0) {
|
|
sh_meta = &shdr[i];
|
|
}
|
|
if ((strcmp(&shstrtab[shdr[i].sh_name], ".data") == 0) ||
|
|
(strcmp(&shstrtab[shdr[i].sh_name], ".rodata") == 0)) {
|
|
sh_data[j++] = &shdr[i];
|
|
}
|
|
}
|
|
if (sh_meta == NULL || sh_data[0] == NULL || sh_data[1] == NULL) {
|
|
printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
|
|
"load_modmetadata: unable to find set_modmetadata_set or data sections\n");
|
|
err = EFTYPE;
|
|
goto out;
|
|
}
|
|
|
|
/* Load set_modmetadata_set into memory */
|
|
err = kern_pread(ef.fd, dest, sh_meta->sh_size, sh_meta->sh_offset);
|
|
if (err != 0) {
|
|
printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
|
|
"load_modmetadata: unable to load set_modmetadata_set: %d\n", err);
|
|
goto out;
|
|
}
|
|
p_start = dest;
|
|
p_end = dest + sh_meta->sh_size;
|
|
dest += sh_meta->sh_size;
|
|
|
|
/* Load data sections into memory. */
|
|
err = kern_pread(ef.fd, dest, sh_data[0]->sh_size,
|
|
sh_data[0]->sh_offset);
|
|
if (err != 0) {
|
|
printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
|
|
"load_modmetadata: unable to load data: %d\n", err);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* We have to increment the dest, so that the offset is the same into
|
|
* both the .rodata and .data sections.
|
|
*/
|
|
ef.off = -(sh_data[0]->sh_addr - dest);
|
|
dest += (sh_data[1]->sh_addr - sh_data[0]->sh_addr);
|
|
|
|
err = kern_pread(ef.fd, dest, sh_data[1]->sh_size,
|
|
sh_data[1]->sh_offset);
|
|
if (err != 0) {
|
|
printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
|
|
"load_modmetadata: unable to load data: %d\n", err);
|
|
goto out;
|
|
}
|
|
|
|
err = __elfN(parse_modmetadata)(fp, &ef, p_start, p_end);
|
|
if (err != 0) {
|
|
printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
|
|
"load_modmetadata: unable to parse metadata: %d\n", err);
|
|
goto out;
|
|
}
|
|
|
|
out:
|
|
if (shstrtab != NULL)
|
|
free(shstrtab);
|
|
if (shdr != NULL)
|
|
free(shdr);
|
|
if (ef.firstpage != NULL)
|
|
free(ef.firstpage);
|
|
if (ef.fd != -1)
|
|
close(ef.fd);
|
|
return (err);
|
|
}
|
|
|
|
int
|
|
__elfN(parse_modmetadata)(struct preloaded_file *fp, elf_file_t ef,
|
|
Elf_Addr p_start, Elf_Addr p_end)
|
|
{
|
|
struct mod_metadata md;
|
|
#if (defined(__i386__) || defined(__powerpc__)) && __ELF_WORD_SIZE == 64
|
|
struct mod_metadata64 md64;
|
|
#elif defined(__amd64__) && __ELF_WORD_SIZE == 32
|
|
struct mod_metadata32 md32;
|
|
#endif
|
|
struct mod_depend *mdepend;
|
|
struct mod_version mver;
|
|
char *s;
|
|
int error, modcnt, minfolen;
|
|
Elf_Addr v, p;
|
|
|
|
modcnt = 0;
|
|
p = p_start;
|
|
while (p < p_end) {
|
|
COPYOUT(p, &v, sizeof(v));
|
|
error = __elfN(reloc_ptr)(fp, ef, p, &v, sizeof(v));
|
|
if (error == EOPNOTSUPP)
|
|
v += ef->off;
|
|
else if (error != 0)
|
|
return (error);
|
|
#if (defined(__i386__) || defined(__powerpc__)) && __ELF_WORD_SIZE == 64
|
|
COPYOUT(v, &md64, sizeof(md64));
|
|
error = __elfN(reloc_ptr)(fp, ef, v, &md64, sizeof(md64));
|
|
if (error == EOPNOTSUPP) {
|
|
md64.md_cval += ef->off;
|
|
md64.md_data += ef->off;
|
|
} else if (error != 0)
|
|
return (error);
|
|
md.md_version = md64.md_version;
|
|
md.md_type = md64.md_type;
|
|
md.md_cval = (const char *)(uintptr_t)md64.md_cval;
|
|
md.md_data = (void *)(uintptr_t)md64.md_data;
|
|
#elif defined(__amd64__) && __ELF_WORD_SIZE == 32
|
|
COPYOUT(v, &md32, sizeof(md32));
|
|
error = __elfN(reloc_ptr)(fp, ef, v, &md32, sizeof(md32));
|
|
if (error == EOPNOTSUPP) {
|
|
md32.md_cval += ef->off;
|
|
md32.md_data += ef->off;
|
|
} else if (error != 0)
|
|
return (error);
|
|
md.md_version = md32.md_version;
|
|
md.md_type = md32.md_type;
|
|
md.md_cval = (const char *)(uintptr_t)md32.md_cval;
|
|
md.md_data = (void *)(uintptr_t)md32.md_data;
|
|
#else
|
|
COPYOUT(v, &md, sizeof(md));
|
|
error = __elfN(reloc_ptr)(fp, ef, v, &md, sizeof(md));
|
|
if (error == EOPNOTSUPP) {
|
|
md.md_cval += ef->off;
|
|
md.md_data += ef->off;
|
|
} else if (error != 0)
|
|
return (error);
|
|
#endif
|
|
p += sizeof(Elf_Addr);
|
|
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);
|
|
minfolen = sizeof(*mdepend) + strlen(s) + 1;
|
|
mdepend = malloc(minfolen);
|
|
if (mdepend == NULL)
|
|
return ENOMEM;
|
|
COPYOUT((vm_offset_t)md.md_data, mdepend, sizeof(*mdepend));
|
|
strcpy((char*)(mdepend + 1), s);
|
|
free(s);
|
|
file_addmetadata(fp, MODINFOMD_DEPLIST, minfolen, mdepend);
|
|
free(mdepend);
|
|
break;
|
|
case MDT_VERSION:
|
|
s = strdupout((vm_offset_t)md.md_cval);
|
|
COPYOUT((vm_offset_t)md.md_data, &mver, sizeof(mver));
|
|
file_addmodule(fp, s, mver.mv_version, NULL);
|
|
free(s);
|
|
modcnt++;
|
|
break;
|
|
}
|
|
}
|
|
if (modcnt == 0) {
|
|
s = fake_modname(fp->f_name);
|
|
file_addmodule(fp, s, 1, 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 __elfN(bad_symtable)[] = "elf" __XSTRING(__ELF_WORD_SIZE) "_lookup_symbol: corrupt symbol table\n";
|
|
int
|
|
__elfN(lookup_symbol)(struct preloaded_file *fp, elf_file_t ef, const char* name,
|
|
Elf_Sym *symp)
|
|
{
|
|
Elf_Hashelt 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(__elfN(bad_symtable));
|
|
return ENOENT;
|
|
}
|
|
|
|
COPYOUT(ef->symtab + symnum, &sym, sizeof(sym));
|
|
if (sym.st_name == 0) {
|
|
printf(__elfN(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;
|
|
}
|
|
|
|
/*
|
|
* Apply any intra-module relocations to the value. p is the load address
|
|
* of the value and val/len is the value to be modified. This does NOT modify
|
|
* the image in-place, because this is done by kern_linker later on.
|
|
*
|
|
* Returns EOPNOTSUPP if no relocation method is supplied.
|
|
*/
|
|
static int
|
|
__elfN(reloc_ptr)(struct preloaded_file *mp, elf_file_t ef,
|
|
Elf_Addr p, void *val, size_t len)
|
|
{
|
|
size_t n;
|
|
Elf_Rela a;
|
|
Elf_Rel r;
|
|
int error;
|
|
|
|
/*
|
|
* The kernel is already relocated, but we still want to apply
|
|
* offset adjustments.
|
|
*/
|
|
if (ef->kernel)
|
|
return (EOPNOTSUPP);
|
|
|
|
for (n = 0; n < ef->relsz / sizeof(r); n++) {
|
|
COPYOUT(ef->rel + n, &r, sizeof(r));
|
|
|
|
error = __elfN(reloc)(ef, __elfN(symaddr), &r, ELF_RELOC_REL,
|
|
ef->off, p, val, len);
|
|
if (error != 0)
|
|
return (error);
|
|
}
|
|
for (n = 0; n < ef->relasz / sizeof(a); n++) {
|
|
COPYOUT(ef->rela + n, &a, sizeof(a));
|
|
|
|
error = __elfN(reloc)(ef, __elfN(symaddr), &a, ELF_RELOC_RELA,
|
|
ef->off, p, val, len);
|
|
if (error != 0)
|
|
return (error);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static Elf_Addr
|
|
__elfN(symaddr)(struct elf_file *ef, Elf_Size symidx)
|
|
{
|
|
|
|
/* Symbol lookup by index not required here. */
|
|
return (0);
|
|
}
|