673 lines
18 KiB
C
673 lines
18 KiB
C
/*-
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* Copyright (c) 1995-1996 Søren Schmidt
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* Copyright (c) 1996 Peter Wemm
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer
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* in this position and unchanged.
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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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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software withough specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $Id: imgact_elf.c,v 1.25 1998/06/07 17:11:31 dfr Exp $
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*/
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#include "opt_rlimit.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/exec.h>
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#include <sys/mman.h>
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#include <sys/imgact.h>
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#include <sys/imgact_elf.h>
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#include <sys/kernel.h>
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#include <sys/sysent.h>
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#include <sys/malloc.h>
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#include <sys/namei.h>
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#include <sys/proc.h>
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#include <sys/syscall.h>
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#include <sys/signalvar.h>
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#include <sys/sysctl.h>
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#include <sys/vnode.h>
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#include <vm/vm.h>
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#include <vm/vm_kern.h>
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#include <vm/vm_param.h>
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#include <vm/pmap.h>
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#include <sys/lock.h>
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#include <vm/vm_map.h>
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#include <vm/vm_prot.h>
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#include <vm/vm_extern.h>
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#include <machine/md_var.h>
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#define MAX_PHDR 32 /* XXX enough ? */
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#if ELF_TARG_CLASS == ELFCLASS32
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#define Elf_Ehdr Elf32_Ehdr
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#define Elf_Phdr Elf32_Phdr
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#define Elf_Auxargs Elf32_Auxargs
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#define Elf_Brandinfo Elf32_Brandinfo
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#else
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#define Elf_Ehdr Elf64_Ehdr
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#define Elf_Phdr Elf64_Phdr
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#define Elf_Auxargs Elf64_Auxargs
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#define Elf_Brandinfo Elf64_Brandinfo
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#endif
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static int elf_check_header __P((const Elf_Ehdr *hdr, int type));
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static int elf_load_section __P((struct vmspace *vmspace, struct vnode *vp, vm_offset_t offset, caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot));
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static int elf_load_file __P((struct proc *p, char *file, u_long *addr, u_long *entry));
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static int elf_freebsd_fixup __P((long **stack_base, struct image_params *imgp));
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static int exec_elf_imgact __P((struct image_params *imgp));
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static int elf_trace = 0;
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SYSCTL_INT(_debug, OID_AUTO, elf_trace, CTLFLAG_RW, &elf_trace, 0, "");
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#define UPRINTF if (elf_trace) uprintf
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static struct sysentvec elf_freebsd_sysvec = {
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SYS_MAXSYSCALL,
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sysent,
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0,
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0,
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0,
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0,
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0,
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0,
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elf_freebsd_fixup,
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sendsig,
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sigcode,
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&szsigcode,
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0,
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"FreeBSD ELF"
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};
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static Elf_Brandinfo freebsd_brand_info = {
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"FreeBSD",
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"",
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"/usr/libexec/ld-elf.so.1",
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&elf_freebsd_sysvec
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};
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static Elf_Brandinfo *elf_brand_list[MAX_BRANDS] = {
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&freebsd_brand_info,
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NULL, NULL, NULL,
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NULL, NULL, NULL, NULL
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};
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int
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elf_insert_brand_entry(Elf_Brandinfo *entry)
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{
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int i;
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for (i=1; i<MAX_BRANDS; i++) {
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if (elf_brand_list[i] == NULL) {
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elf_brand_list[i] = entry;
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break;
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}
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}
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if (i == MAX_BRANDS)
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return -1;
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return 0;
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}
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int
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elf_remove_brand_entry(Elf_Brandinfo *entry)
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{
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int i;
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for (i=1; i<MAX_BRANDS; i++) {
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if (elf_brand_list[i] == entry) {
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elf_brand_list[i] = NULL;
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break;
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}
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}
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if (i == MAX_BRANDS)
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return -1;
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return 0;
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}
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static int
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elf_check_header(const Elf_Ehdr *hdr, int type)
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{
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if (!(hdr->e_ident[EI_MAG0] == ELFMAG0 &&
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hdr->e_ident[EI_MAG1] == ELFMAG1 &&
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hdr->e_ident[EI_MAG2] == ELFMAG2 &&
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hdr->e_ident[EI_MAG3] == ELFMAG3))
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return ENOEXEC;
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#ifdef __i386__
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if (hdr->e_machine != EM_386 && hdr->e_machine != EM_486)
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#endif
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#ifdef __alpha__
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if (hdr->e_machine != EM_ALPHA)
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#endif
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return ENOEXEC;
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if (hdr->e_type != type)
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return ENOEXEC;
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return 0;
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}
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static int
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elf_load_section(struct vmspace *vmspace, struct vnode *vp, vm_offset_t offset, caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot)
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{
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size_t map_len;
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vm_offset_t map_addr;
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int error;
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unsigned char *data_buf = 0;
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size_t copy_len;
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map_addr = trunc_page(vmaddr);
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if (memsz > filsz)
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map_len = trunc_page(offset+filsz) - trunc_page(offset);
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else
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map_len = round_page(offset+filsz) - trunc_page(offset);
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if (error = vm_mmap (&vmspace->vm_map,
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&map_addr,
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map_len,
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prot,
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VM_PROT_ALL,
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MAP_PRIVATE | MAP_FIXED,
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(caddr_t)vp,
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trunc_page(offset)))
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return error;
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if (memsz == filsz)
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return 0;
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/*
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* We have to map the remaining bit of the file into the kernel's
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* memory map, allocate some anonymous memory, and copy that last
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* bit into it. The remaining space should be .bss...
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*/
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copy_len = (offset + filsz) - trunc_page(offset + filsz);
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map_addr = trunc_page(vmaddr + filsz);
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map_len = round_page(vmaddr + memsz) - map_addr;
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if (map_len != 0) {
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if (error = vm_map_find(&vmspace->vm_map, NULL, 0,
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&map_addr, map_len, FALSE,
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VM_PROT_ALL, VM_PROT_ALL,0))
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return error;
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}
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if (error = vm_mmap(exec_map,
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(vm_offset_t *)&data_buf,
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PAGE_SIZE,
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VM_PROT_READ,
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VM_PROT_READ,
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0,
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(caddr_t)vp,
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trunc_page(offset + filsz)))
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return error;
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error = copyout(data_buf, (caddr_t)map_addr, copy_len);
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vm_map_remove(exec_map, (vm_offset_t)data_buf,
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(vm_offset_t)data_buf + PAGE_SIZE);
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/*
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* set it to the specified protection
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*/
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vm_map_protect(&vmspace->vm_map, map_addr, map_addr + map_len, prot,
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FALSE);
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UPRINTF("bss size %d (%x)\n", map_len-copy_len, map_len-copy_len);
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return error;
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}
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static int
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elf_load_file(struct proc *p, char *file, u_long *addr, u_long *entry)
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{
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Elf_Ehdr *hdr = NULL;
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Elf_Phdr *phdr = NULL;
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struct nameidata nd;
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struct vmspace *vmspace = p->p_vmspace;
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struct vattr attr;
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struct image_params image_params, *imgp;
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vm_prot_t prot = 0;
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unsigned long text_size = 0, data_size = 0;
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unsigned long text_addr = 0, data_addr = 0;
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int header_size = 0;
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int error, i;
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imgp = &image_params;
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/*
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* Initialize part of the common data
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*/
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imgp->proc = p;
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imgp->uap = NULL;
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imgp->attr = &attr;
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imgp->firstpage = NULL;
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imgp->image_header = (char *)kmem_alloc_wait(exec_map, PAGE_SIZE);
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if (imgp->image_header == NULL) {
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nd.ni_vp = NULL;
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error = ENOMEM;
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goto fail;
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}
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NDINIT(&nd, LOOKUP, LOCKLEAF|FOLLOW, UIO_SYSSPACE, file, p);
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if (error = namei(&nd)) {
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nd.ni_vp = NULL;
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goto fail;
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}
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imgp->vp = nd.ni_vp;
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/*
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* Check permissions, modes, uid, etc on the file, and "open" it.
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*/
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error = exec_check_permissions(imgp);
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if (error) {
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VOP_UNLOCK(nd.ni_vp, 0, p);
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goto fail;
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}
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error = exec_map_first_page(imgp);
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VOP_UNLOCK(nd.ni_vp, 0, p);
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if (error)
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goto fail;
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hdr = (Elf_Ehdr *)imgp->image_header;
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if (error = elf_check_header(hdr, ET_DYN))
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goto fail;
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/*
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* ouch, need to bounds check in case user gives us a corrupted
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* file with an insane header size
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*/
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if (hdr->e_phnum > MAX_PHDR) { /* XXX: ever more than this? */
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error = ENOEXEC;
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goto fail;
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}
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header_size = hdr->e_phentsize * hdr->e_phnum;
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/* Only support headers that fit within first page for now */
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if (header_size + hdr->e_phoff > PAGE_SIZE) {
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error = ENOEXEC;
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goto fail;
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}
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phdr = (Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
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for (i = 0; i < hdr->e_phnum; i++) {
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switch(phdr[i].p_type) {
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case PT_NULL: /* NULL section */
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UPRINTF ("ELF(file) PT_NULL section\n");
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break;
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case PT_LOAD: /* Loadable segment */
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{
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UPRINTF ("ELF(file) PT_LOAD section ");
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if (phdr[i].p_flags & PF_X)
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prot |= VM_PROT_EXECUTE;
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if (phdr[i].p_flags & PF_W)
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prot |= VM_PROT_WRITE;
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if (phdr[i].p_flags & PF_R)
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prot |= VM_PROT_READ;
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if (error = elf_load_section(vmspace, nd.ni_vp,
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phdr[i].p_offset,
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(caddr_t)phdr[i].p_vaddr +
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(*addr),
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phdr[i].p_memsz,
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phdr[i].p_filesz, prot))
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goto fail;
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/*
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* Is this .text or .data ??
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*
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* We only handle one each of those yet XXX
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*/
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if (hdr->e_entry >= phdr[i].p_vaddr &&
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hdr->e_entry <(phdr[i].p_vaddr+phdr[i].p_memsz)) {
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text_addr = trunc_page(phdr[i].p_vaddr+(*addr));
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text_size = round_page(phdr[i].p_memsz +
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phdr[i].p_vaddr -
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trunc_page(phdr[i].p_vaddr));
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*entry=(unsigned long)hdr->e_entry+(*addr);
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UPRINTF(".text <%08x,%08x> entry=%08x\n",
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text_addr, text_size, *entry);
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} else {
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data_addr = trunc_page(phdr[i].p_vaddr+(*addr));
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data_size = round_page(phdr[i].p_memsz +
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phdr[i].p_vaddr -
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trunc_page(phdr[i].p_vaddr));
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UPRINTF(".data <%08x,%08x>\n",
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data_addr, data_size);
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}
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}
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break;
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case PT_DYNAMIC:/* Dynamic link information */
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UPRINTF ("ELF(file) PT_DYNAMIC section\n");
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break;
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case PT_INTERP: /* Path to interpreter */
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UPRINTF ("ELF(file) PT_INTERP section\n");
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break;
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case PT_NOTE: /* Note section */
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UPRINTF ("ELF(file) PT_NOTE section\n");
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break;
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case PT_SHLIB: /* Shared lib section */
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UPRINTF ("ELF(file) PT_SHLIB section\n");
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break;
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case PT_PHDR: /* Program header table info */
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UPRINTF ("ELF(file) PT_PHDR section\n");
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break;
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default:
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UPRINTF ("ELF(file) %d section ??\n", phdr[i].p_type );
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}
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}
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fail:
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if (imgp->firstpage)
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exec_unmap_first_page(imgp);
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if (imgp->image_header)
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kmem_free_wakeup(exec_map, (vm_offset_t)imgp->image_header,
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PAGE_SIZE);
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if (nd.ni_vp)
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vrele(nd.ni_vp);
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return error;
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}
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static int
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exec_elf_imgact(struct image_params *imgp)
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{
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const Elf_Ehdr *hdr = (const Elf_Ehdr *) imgp->image_header;
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const Elf_Phdr *phdr, *mapped_phdr = NULL;
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Elf_Auxargs *elf_auxargs = NULL;
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struct vmspace *vmspace;
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vm_prot_t prot = 0;
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u_long text_size = 0, data_size = 0;
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u_long text_addr = 0, data_addr = 0;
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u_long addr, entry = 0, proghdr = 0;
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int error, i, header_size = 0;
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const char *interp = NULL;
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char *brand = NULL;
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char path[MAXPATHLEN];
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/*
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* Do we have a valid ELF header ?
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*/
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if (elf_check_header(hdr, ET_EXEC))
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return -1;
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/*
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* From here on down, we return an errno, not -1, as we've
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* detected an ELF file.
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*/
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/*
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* ouch, need to bounds check in case user gives us a corrupted
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* file with an insane header size
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*/
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if (hdr->e_phnum > MAX_PHDR) { /* XXX: ever more than this? */
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return ENOEXEC;
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}
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header_size = hdr->e_phentsize * hdr->e_phnum;
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if ((hdr->e_phoff > PAGE_SIZE) ||
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(hdr->e_phoff + header_size) > PAGE_SIZE) {
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/* Only support headers in first page for now */
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return ENOEXEC;
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} else {
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phdr = (const Elf_Phdr*)
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((const char *)imgp->image_header + hdr->e_phoff);
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}
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/*
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* From this point on, we may have resources that need to be freed.
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*/
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if (error = exec_extract_strings(imgp))
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goto fail;
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exec_new_vmspace(imgp);
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vmspace = imgp->proc->p_vmspace;
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for (i = 0; i < hdr->e_phnum; i++) {
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switch(phdr[i].p_type) {
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case PT_NULL: /* NULL section */
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UPRINTF ("ELF PT_NULL section\n");
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break;
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case PT_LOAD: /* Loadable segment */
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{
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UPRINTF ("ELF PT_LOAD section ");
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if (phdr[i].p_flags & PF_X)
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prot |= VM_PROT_EXECUTE;
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if (phdr[i].p_flags & PF_W)
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prot |= VM_PROT_WRITE;
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if (phdr[i].p_flags & PF_R)
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prot |= VM_PROT_READ;
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if (error = elf_load_section(vmspace, imgp->vp,
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phdr[i].p_offset,
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(caddr_t)phdr[i].p_vaddr,
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phdr[i].p_memsz,
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phdr[i].p_filesz, prot))
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goto fail;
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/*
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* Is this .text or .data ??
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*
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* We only handle one each of those yet XXX
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*/
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if (hdr->e_entry >= phdr[i].p_vaddr &&
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hdr->e_entry <(phdr[i].p_vaddr+phdr[i].p_memsz)) {
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text_addr = trunc_page(phdr[i].p_vaddr);
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text_size = round_page(phdr[i].p_memsz +
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phdr[i].p_vaddr -
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text_addr);
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entry = (u_long)hdr->e_entry;
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UPRINTF(".text <%08x,%08x> entry=%08x\n",
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text_addr, text_size, entry);
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} else {
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data_addr = trunc_page(phdr[i].p_vaddr);
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data_size = round_page(phdr[i].p_memsz +
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phdr[i].p_vaddr -
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data_addr);
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UPRINTF(".data <%08x,%08x>\n",
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data_addr, data_size);
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}
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}
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break;
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|
|
case PT_DYNAMIC:/* Dynamic link information */
|
|
UPRINTF ("ELF PT_DYNAMIC section ??\n");
|
|
break;
|
|
case PT_INTERP: /* Path to interpreter */
|
|
UPRINTF ("ELF PT_INTERP section ");
|
|
if (phdr[i].p_filesz > MAXPATHLEN ||
|
|
phdr[i].p_offset + phdr[i].p_filesz > PAGE_SIZE) {
|
|
error = ENOEXEC;
|
|
goto fail;
|
|
}
|
|
interp = imgp->image_header + phdr[i].p_offset;
|
|
UPRINTF("<%s>\n", interp);
|
|
break;
|
|
case PT_NOTE: /* Note section */
|
|
UPRINTF ("ELF PT_NOTE section\n");
|
|
break;
|
|
case PT_SHLIB: /* Shared lib section */
|
|
UPRINTF ("ELF PT_SHLIB section\n");
|
|
break;
|
|
case PT_PHDR: /* Program header table info */
|
|
UPRINTF ("ELF PT_PHDR section <%x>\n", phdr[i].p_vaddr);
|
|
proghdr = phdr[i].p_vaddr;
|
|
break;
|
|
default:
|
|
UPRINTF ("ELF %d section ??\n", phdr[i].p_type);
|
|
}
|
|
}
|
|
|
|
vmspace->vm_tsize = text_size >> PAGE_SHIFT;
|
|
vmspace->vm_taddr = (caddr_t)text_addr;
|
|
vmspace->vm_dsize = data_size >> PAGE_SHIFT;
|
|
vmspace->vm_daddr = (caddr_t)data_addr;
|
|
|
|
addr = 2L*MAXDSIZ; /* May depend on OS type XXX */
|
|
|
|
imgp->entry_addr = entry;
|
|
|
|
/*
|
|
* So which kind (brand) of ELF binary do we have at hand
|
|
* FreeBSD, Linux, SVR4 or something else ??
|
|
* If its has a interpreter section try that first
|
|
*/
|
|
if (interp) {
|
|
for (i=0; i<MAX_BRANDS; i++) {
|
|
if (elf_brand_list[i] != NULL) {
|
|
if (!strcmp(interp, elf_brand_list[i]->interp_path)) {
|
|
imgp->proc->p_sysent =
|
|
elf_brand_list[i]->sysvec;
|
|
strcpy(path, elf_brand_list[i]->emul_path);
|
|
strcat(path, elf_brand_list[i]->interp_path);
|
|
UPRINTF("interpreter=<%s> %s\n",
|
|
elf_brand_list[i]->interp_path,
|
|
elf_brand_list[i]->emul_path);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If there is no interpreter, or recognition of it
|
|
* failed, se if the binary is branded.
|
|
*/
|
|
if (!interp || i == MAX_BRANDS) {
|
|
brand = (char *)&(hdr->e_ident[EI_BRAND]);
|
|
for (i=0; i<MAX_BRANDS; i++) {
|
|
if (elf_brand_list[i] != NULL) {
|
|
if (!strcmp(brand, elf_brand_list[i]->brand)) {
|
|
imgp->proc->p_sysent = elf_brand_list[i]->sysvec;
|
|
if (interp) {
|
|
strcpy(path, elf_brand_list[i]->emul_path);
|
|
strcat(path, elf_brand_list[i]->interp_path);
|
|
UPRINTF("interpreter=<%s> %s\n",
|
|
elf_brand_list[i]->interp_path,
|
|
elf_brand_list[i]->emul_path);
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
if (i == MAX_BRANDS) {
|
|
uprintf("ELF binary type not known\n");
|
|
#ifdef __alpha__
|
|
uprintf("assuming FreeBSD\n");
|
|
i = 0;
|
|
#else
|
|
error = ENOEXEC;
|
|
goto fail;
|
|
#endif
|
|
}
|
|
if (interp) {
|
|
if (error = elf_load_file(imgp->proc,
|
|
path,
|
|
&addr, /* XXX */
|
|
&imgp->entry_addr)) {
|
|
uprintf("ELF interpreter %s not found\n", path);
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
UPRINTF("Executing %s binary\n", elf_brand_list[i]->brand);
|
|
|
|
/*
|
|
* Construct auxargs table (used by the fixup routine)
|
|
*/
|
|
elf_auxargs = malloc(sizeof(Elf_Auxargs), M_TEMP, M_WAITOK);
|
|
elf_auxargs->execfd = -1;
|
|
elf_auxargs->phdr = proghdr;
|
|
elf_auxargs->phent = hdr->e_phentsize;
|
|
elf_auxargs->phnum = hdr->e_phnum;
|
|
elf_auxargs->pagesz = PAGE_SIZE;
|
|
elf_auxargs->base = addr;
|
|
elf_auxargs->flags = 0;
|
|
elf_auxargs->entry = entry;
|
|
elf_auxargs->trace = elf_trace;
|
|
|
|
imgp->auxargs = elf_auxargs;
|
|
imgp->interpreted = 0;
|
|
|
|
/* don't allow modifying the file while we run it */
|
|
imgp->vp->v_flag |= VTEXT;
|
|
|
|
fail:
|
|
return error;
|
|
}
|
|
|
|
static int
|
|
elf_freebsd_fixup(long **stack_base, struct image_params *imgp)
|
|
{
|
|
Elf_Auxargs *args = (Elf_Auxargs *)imgp->auxargs;
|
|
long *pos;
|
|
|
|
pos = *stack_base + (imgp->argc + imgp->envc + 2);
|
|
|
|
if (args->trace) {
|
|
AUXARGS_ENTRY(pos, AT_DEBUG, 1);
|
|
}
|
|
if (args->execfd != -1) {
|
|
AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
|
|
}
|
|
AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
|
|
AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
|
|
AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
|
|
AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
|
|
AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
|
|
AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
|
|
AUXARGS_ENTRY(pos, AT_BASE, args->base);
|
|
AUXARGS_ENTRY(pos, AT_NULL, 0);
|
|
|
|
free(imgp->auxargs, M_TEMP);
|
|
imgp->auxargs = NULL;
|
|
|
|
(*stack_base)--;
|
|
**stack_base = (long)imgp->argc;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Tell kern_execve.c about it, with a little help from the linker.
|
|
* Since `const' objects end up in the text segment, TEXT_SET is the
|
|
* correct directive to use.
|
|
*/
|
|
static const struct execsw elf_execsw = {exec_elf_imgact, "ELF"};
|
|
TEXT_SET(execsw_set, elf_execsw);
|
|
|