This is required for preloading modules into a KASAN-configured kernel. MFC after: 1 week Sponsored by: The FreeBSD Foundation
584 lines
15 KiB
C
584 lines
15 KiB
C
/*-
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* Copyright (c) 2004 Ian Dowse <iedowse@freebsd.org>
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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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#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 <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 <sys/link_elf.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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#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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typedef struct elf_file {
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Elf_Ehdr hdr;
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Elf_Shdr *e_shdr;
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int symtabindex; /* Index of symbol table */
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int shstrindex; /* Index of section name string table */
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int fd;
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vm_offset_t off;
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#ifdef LOADER_VERIEXEC_VECTX
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struct vectx *vctx;
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#endif
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} *elf_file_t;
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#ifdef LOADER_VERIEXEC_VECTX
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#define VECTX_HANDLE(ef) (ef)->vctx
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#else
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#define VECTX_HANDLE(ef) (ef)->fd
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#endif
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static int __elfN(obj_loadimage)(struct preloaded_file *mp, elf_file_t ef,
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uint64_t loadaddr);
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static int __elfN(obj_lookup_set)(struct preloaded_file *mp, elf_file_t ef,
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const char *name, Elf_Addr *startp, Elf_Addr *stopp, int *countp);
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static int __elfN(obj_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(obj_parse_modmetadata)(struct preloaded_file *mp,
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elf_file_t ef);
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static Elf_Addr __elfN(obj_symaddr)(struct elf_file *ef, Elf_Size symidx);
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const char *__elfN(obj_kerneltype) = "elf kernel";
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const char *__elfN(obj_moduletype) = "elf obj 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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__elfN(obj_loadfile)(char *filename, uint64_t dest,
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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 *hdr;
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int err;
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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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#ifdef LOADER_VERIEXEC_VECTX
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{
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int verror;
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ef.vctx = vectx_open(ef.fd, filename, 0L, NULL, &verror, __func__);
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if (verror) {
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printf("Unverified %s: %s\n", filename, ve_error_get());
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close(ef.fd);
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free(ef.vctx);
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return (EAUTH);
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}
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}
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#endif
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hdr = &ef.hdr;
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bytes_read = VECTX_READ(VECTX_HANDLE(&ef), hdr, sizeof(*hdr));
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if (bytes_read != sizeof(*hdr)) {
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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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/* Is it ELF? */
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if (!IS_ELF(*hdr)) {
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err = EFTYPE;
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goto oerr;
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}
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if (hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS || /* Layout ? */
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hdr->e_ident[EI_DATA] != ELF_TARG_DATA ||
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hdr->e_ident[EI_VERSION] != EV_CURRENT || /* Version ? */
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hdr->e_version != EV_CURRENT ||
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hdr->e_machine != ELF_TARG_MACH || /* Machine ? */
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hdr->e_type != ET_REL) {
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err = EFTYPE;
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goto oerr;
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}
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if (hdr->e_shnum * hdr->e_shentsize == 0 || hdr->e_shoff == 0 ||
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hdr->e_shentsize != sizeof(Elf_Shdr)) {
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err = EFTYPE;
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goto oerr;
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}
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#if defined(LOADER_VERIEXEC) && !defined(LOADER_VERIEXEC_VECTX)
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if (verify_file(ef.fd, filename, bytes_read, VE_MUST, __func__) < 0) {
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err = EAUTH;
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goto oerr;
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}
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#endif
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kfp = file_findfile(NULL, __elfN(obj_kerneltype));
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if (kfp == NULL) {
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printf("elf" __XSTRING(__ELF_WORD_SIZE)
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"_obj_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 (archsw.arch_loadaddr != NULL)
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dest = archsw.arch_loadaddr(LOAD_ELF, hdr, 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)
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"_obj_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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fp->f_name = strdup(filename);
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fp->f_type = strdup(__elfN(obj_moduletype));
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printf("%s ", filename);
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fp->f_size = __elfN(obj_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(*hdr), hdr);
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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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#ifdef LOADER_VERIEXEC_VECTX
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if (!err && ef.vctx) {
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int verror;
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verror = vectx_close(ef.vctx, VE_MUST, __func__);
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if (verror) {
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err = EAUTH;
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file_discard(fp);
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}
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}
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#endif
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close(ef.fd);
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if (ef.e_shdr != NULL)
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free(ef.e_shdr);
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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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__elfN(obj_loadimage)(struct preloaded_file *fp, elf_file_t ef, uint64_t off)
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{
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Elf_Ehdr *hdr;
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Elf_Shdr *shdr, *cshdr, *lshdr;
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vm_offset_t firstaddr, lastaddr;
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int i, nsym, res, ret, shdrbytes, symstrindex;
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ret = 0;
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firstaddr = lastaddr = (vm_offset_t)off;
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hdr = &ef->hdr;
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ef->off = (vm_offset_t)off;
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/* Read in the section headers. */
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shdrbytes = hdr->e_shnum * hdr->e_shentsize;
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shdr = alloc_pread(VECTX_HANDLE(ef), (off_t)hdr->e_shoff, shdrbytes);
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if (shdr == NULL) {
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printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
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"_obj_loadimage: read section headers failed\n");
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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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* Decide where to load everything, but don't read it yet.
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* We store the load address as a non-zero sh_addr value.
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* Start with the code/data and bss.
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*/
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for (i = 0; i < hdr->e_shnum; i++)
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shdr[i].sh_addr = 0;
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for (i = 0; i < hdr->e_shnum; i++) {
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if (shdr[i].sh_size == 0)
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continue;
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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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#if defined(__i386__) || defined(__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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if ((shdr[i].sh_flags & SHF_ALLOC) == 0)
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break;
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lastaddr = roundup(lastaddr, shdr[i].sh_addralign);
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shdr[i].sh_addr = (Elf_Addr)lastaddr;
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lastaddr += shdr[i].sh_size;
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break;
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}
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}
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/* Symbols. */
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nsym = 0;
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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_SYMTAB:
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nsym++;
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ef->symtabindex = i;
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shdr[i].sh_addr = (Elf_Addr)lastaddr;
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lastaddr += shdr[i].sh_size;
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break;
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}
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}
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if (nsym != 1) {
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printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
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"_obj_loadimage: file has no valid symbol table\n");
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goto out;
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}
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lastaddr = roundup(lastaddr, shdr[ef->symtabindex].sh_addralign);
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shdr[ef->symtabindex].sh_addr = (Elf_Addr)lastaddr;
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lastaddr += shdr[ef->symtabindex].sh_size;
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symstrindex = shdr[ef->symtabindex].sh_link;
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if (symstrindex < 0 || symstrindex >= hdr->e_shnum ||
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shdr[symstrindex].sh_type != SHT_STRTAB) {
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printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
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"_obj_loadimage: file has invalid symbol strings\n");
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goto out;
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}
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lastaddr = roundup(lastaddr, shdr[symstrindex].sh_addralign);
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shdr[symstrindex].sh_addr = (Elf_Addr)lastaddr;
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lastaddr += shdr[symstrindex].sh_size;
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/* Section names. */
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if (hdr->e_shstrndx == 0 || hdr->e_shstrndx >= hdr->e_shnum ||
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shdr[hdr->e_shstrndx].sh_type != SHT_STRTAB) {
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printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
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"_obj_loadimage: file has no section names\n");
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goto out;
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}
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ef->shstrindex = hdr->e_shstrndx;
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lastaddr = roundup(lastaddr, shdr[ef->shstrindex].sh_addralign);
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shdr[ef->shstrindex].sh_addr = (Elf_Addr)lastaddr;
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lastaddr += shdr[ef->shstrindex].sh_size;
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/* Relocation tables. */
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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_REL:
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case SHT_RELA:
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if ((shdr[shdr[i].sh_info].sh_flags & SHF_ALLOC) == 0)
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break;
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lastaddr = roundup(lastaddr, shdr[i].sh_addralign);
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shdr[i].sh_addr = (Elf_Addr)lastaddr;
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lastaddr += shdr[i].sh_size;
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break;
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}
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}
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/* Clear the whole area, including bss regions. */
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kern_bzero(firstaddr, lastaddr - firstaddr);
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/* Figure section with the lowest file offset we haven't loaded yet. */
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for (cshdr = NULL; /* none */; /* none */)
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{
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/*
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* Find next section to load. The complexity of this loop is
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* O(n^2), but with the number of sections being typically
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* small, we do not care.
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*/
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lshdr = cshdr;
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for (i = 0; i < hdr->e_shnum; i++) {
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if (shdr[i].sh_addr == 0 ||
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shdr[i].sh_type == SHT_NOBITS)
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continue;
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/* Skip sections that were loaded already. */
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if (lshdr != NULL &&
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lshdr->sh_offset >= shdr[i].sh_offset)
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continue;
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/* Find section with smallest offset. */
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if (cshdr == lshdr ||
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cshdr->sh_offset > shdr[i].sh_offset)
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cshdr = &shdr[i];
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}
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if (cshdr == lshdr)
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break;
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if (kern_pread(VECTX_HANDLE(ef), (vm_offset_t)cshdr->sh_addr,
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cshdr->sh_size, (off_t)cshdr->sh_offset) != 0) {
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printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
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"_obj_loadimage: read failed\n");
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goto out;
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}
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}
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file_addmetadata(fp, MODINFOMD_SHDR, shdrbytes, shdr);
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res = __elfN(obj_parse_modmetadata)(fp, ef);
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if (res != 0)
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goto out;
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ret = lastaddr - firstaddr;
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fp->f_addr = firstaddr;
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printf("size 0x%lx at 0x%lx", (u_long)ret, (u_long)firstaddr);
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out:
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printf("\n");
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return ret;
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}
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#if defined(__i386__) && __ELF_WORD_SIZE == 64
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struct mod_metadata64 {
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int md_version; /* structure version MDTV_* */
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int md_type; /* type of entry MDT_* */
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uint64_t md_data; /* specific data */
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uint64_t md_cval; /* common string label */
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};
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#endif
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int
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__elfN(obj_parse_modmetadata)(struct preloaded_file *fp, elf_file_t ef)
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{
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struct mod_metadata md;
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#if defined(__i386__) && __ELF_WORD_SIZE == 64
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struct mod_metadata64 md64;
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#endif
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struct mod_depend *mdepend;
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struct mod_version mver;
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char *s;
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int error, modcnt, minfolen;
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Elf_Addr v, p, p_stop;
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if (__elfN(obj_lookup_set)(fp, ef, "modmetadata_set", &p, &p_stop,
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&modcnt) != 0)
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return 0;
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|
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modcnt = 0;
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while (p < p_stop) {
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COPYOUT(p, &v, sizeof(v));
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error = __elfN(obj_reloc_ptr)(fp, ef, p, &v, sizeof(v));
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if (error != 0)
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return (error);
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#if defined(__i386__) && __ELF_WORD_SIZE == 64
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COPYOUT(v, &md64, sizeof(md64));
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error = __elfN(obj_reloc_ptr)(fp, ef, v, &md64, sizeof(md64));
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if (error != 0)
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return (error);
|
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md.md_version = md64.md_version;
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md.md_type = md64.md_type;
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md.md_cval = (const char *)(uintptr_t)md64.md_cval;
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md.md_data = (void *)(uintptr_t)md64.md_data;
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#else
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COPYOUT(v, &md, sizeof(md));
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error = __elfN(obj_reloc_ptr)(fp, ef, v, &md, sizeof(md));
|
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if (error != 0)
|
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return (error);
|
|
#endif
|
|
p += sizeof(Elf_Addr);
|
|
switch(md.md_type) {
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case MDT_DEPEND:
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s = strdupout((vm_offset_t)md.md_cval);
|
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minfolen = sizeof(*mdepend) + strlen(s) + 1;
|
|
mdepend = malloc(minfolen);
|
|
if (mdepend == NULL)
|
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return ENOMEM;
|
|
COPYOUT((vm_offset_t)md.md_data, mdepend,
|
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sizeof(*mdepend));
|
|
strcpy((char*)(mdepend + 1), s);
|
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free(s);
|
|
file_addmetadata(fp, MODINFOMD_DEPLIST, minfolen,
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mdepend);
|
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free(mdepend);
|
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break;
|
|
case MDT_VERSION:
|
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s = strdupout((vm_offset_t)md.md_cval);
|
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COPYOUT((vm_offset_t)md.md_data, &mver, sizeof(mver));
|
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file_addmodule(fp, s, mver.mv_version, NULL);
|
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free(s);
|
|
modcnt++;
|
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break;
|
|
case MDT_MODULE:
|
|
case MDT_PNP_INFO:
|
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break;
|
|
default:
|
|
printf("unknown type %d\n", md.md_type);
|
|
break;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
__elfN(obj_lookup_set)(struct preloaded_file *fp, elf_file_t ef,
|
|
const char* name, Elf_Addr *startp, Elf_Addr *stopp, int *countp)
|
|
{
|
|
Elf_Ehdr *hdr;
|
|
Elf_Shdr *shdr;
|
|
char *p;
|
|
vm_offset_t shstrtab;
|
|
int i;
|
|
|
|
hdr = &ef->hdr;
|
|
shdr = ef->e_shdr;
|
|
shstrtab = shdr[ef->shstrindex].sh_addr;
|
|
|
|
for (i = 0; i < hdr->e_shnum; i++) {
|
|
if (shdr[i].sh_type != SHT_PROGBITS)
|
|
continue;
|
|
if (shdr[i].sh_name == 0)
|
|
continue;
|
|
p = strdupout(shstrtab + shdr[i].sh_name);
|
|
if (strncmp(p, "set_", 4) == 0 && strcmp(p + 4, name) == 0) {
|
|
*startp = shdr[i].sh_addr;
|
|
*stopp = shdr[i].sh_addr + shdr[i].sh_size;
|
|
*countp = (*stopp - *startp) / sizeof(Elf_Addr);
|
|
free(p);
|
|
return (0);
|
|
}
|
|
free(p);
|
|
}
|
|
|
|
return (ESRCH);
|
|
}
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
static int
|
|
__elfN(obj_reloc_ptr)(struct preloaded_file *mp, elf_file_t ef, Elf_Addr p,
|
|
void *val, size_t len)
|
|
{
|
|
Elf_Ehdr *hdr;
|
|
Elf_Shdr *shdr;
|
|
Elf_Addr off = p;
|
|
Elf_Addr base;
|
|
Elf_Rela a, *abase;
|
|
Elf_Rel r, *rbase;
|
|
int error, i, j, nrel, nrela;
|
|
|
|
hdr = &ef->hdr;
|
|
shdr = ef->e_shdr;
|
|
|
|
for (i = 0; i < hdr->e_shnum; i++) {
|
|
if (shdr[i].sh_type != SHT_RELA && shdr[i].sh_type != SHT_REL)
|
|
continue;
|
|
base = shdr[shdr[i].sh_info].sh_addr;
|
|
if (base == 0 || shdr[i].sh_addr == 0)
|
|
continue;
|
|
if (off < base || off + len > base +
|
|
shdr[shdr[i].sh_info].sh_size)
|
|
continue;
|
|
|
|
switch (shdr[i].sh_type) {
|
|
case SHT_RELA:
|
|
abase = (Elf_Rela *)(intptr_t)shdr[i].sh_addr;
|
|
|
|
nrela = shdr[i].sh_size / sizeof(Elf_Rela);
|
|
for (j = 0; j < nrela; j++) {
|
|
COPYOUT(abase + j, &a, sizeof(a));
|
|
|
|
error = __elfN(reloc)(ef, __elfN(obj_symaddr),
|
|
&a, ELF_RELOC_RELA, base, off, val, len);
|
|
if (error != 0)
|
|
return (error);
|
|
}
|
|
break;
|
|
case SHT_REL:
|
|
rbase = (Elf_Rel *)(intptr_t)shdr[i].sh_addr;
|
|
|
|
nrel = shdr[i].sh_size / sizeof(Elf_Rel);
|
|
for (j = 0; j < nrel; j++) {
|
|
COPYOUT(rbase + j, &r, sizeof(r));
|
|
|
|
error = __elfN(reloc)(ef, __elfN(obj_symaddr),
|
|
&r, ELF_RELOC_REL, base, off, val, len);
|
|
if (error != 0)
|
|
return (error);
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/* Look up the address of a specified symbol. */
|
|
static Elf_Addr
|
|
__elfN(obj_symaddr)(struct elf_file *ef, Elf_Size symidx)
|
|
{
|
|
Elf_Sym sym;
|
|
Elf_Addr base;
|
|
|
|
if (symidx >= ef->e_shdr[ef->symtabindex].sh_size / sizeof(Elf_Sym))
|
|
return (0);
|
|
COPYOUT(ef->e_shdr[ef->symtabindex].sh_addr + symidx * sizeof(Elf_Sym),
|
|
&sym, sizeof(sym));
|
|
if (sym.st_shndx == SHN_UNDEF || sym.st_shndx >= ef->hdr.e_shnum)
|
|
return (0);
|
|
base = ef->e_shdr[sym.st_shndx].sh_addr;
|
|
if (base == 0)
|
|
return (0);
|
|
return (base + sym.st_value);
|
|
}
|