471 lines
13 KiB
C
471 lines
13 KiB
C
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/* $NetBSD: map_object.c,v 1.45 2012/10/13 21:13:07 dholland Exp $ */
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/*
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* Copyright 1996 John D. Polstra.
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* Copyright 1996 Matt Thomas <matt@3am-software.com>
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* Copyright 2002 Charles M. Hannum <root@ihack.net>
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by John Polstra.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without 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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#include <sys/cdefs.h>
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#ifndef lint
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__RCSID("$NetBSD: map_object.c,v 1.45 2012/10/13 21:13:07 dholland Exp $");
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#endif /* not lint */
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#include <errno.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/mman.h>
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#include "debug.h"
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#include "rtld.h"
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#ifdef __minix
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#define munmap minix_munmap
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#endif
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#define MINIXVERBOSE 0
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#if MINIXVERBOSE
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#include <stdio.h>
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#endif
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static int protflags(int); /* Elf flags -> mmap protection */
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#define EA_UNDEF (~(Elf_Addr)0)
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static void Pread(void *addr, size_t size, int fd, off_t off)
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{
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int s;
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if((s=pread(fd,addr, size, off)) < 0) {
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_rtld_error("pread failed");
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exit(1);
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}
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#if MINIXVERBOSE
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fprintf(stderr, "read 0x%lx bytes from offset 0x%lx to addr 0x%lx\n", size, off, addr);
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#endif
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}
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/* minix-without-mmap version of _rtld_map_object() */
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Obj_Entry *
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_rtld_map_object_fallback(const char *path, int fd, const struct stat *sb)
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{
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Obj_Entry *obj;
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Elf_Ehdr *ehdr;
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Elf_Phdr *phdr;
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#if defined(__HAVE_TLS_VARIANT_I) || defined(__HAVE_TLS_VARIANT_II)
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Elf_Phdr *phtls;
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#endif
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size_t phsize;
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Elf_Phdr *phlimit;
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Elf_Phdr *segs[2];
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int nsegs;
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caddr_t mapbase = MAP_FAILED;
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size_t mapsize = 0;
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int mapflags;
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Elf_Off base_offset;
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#ifdef MAP_ALIGNED
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Elf_Addr base_alignment;
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#endif
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Elf_Addr base_vaddr;
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Elf_Addr base_vlimit;
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Elf_Addr text_vlimit;
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int text_flags;
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caddr_t base_addr;
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Elf_Off data_offset;
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Elf_Addr data_vaddr;
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Elf_Addr data_vlimit;
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int data_flags;
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caddr_t data_addr;
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#if defined(__HAVE_TLS_VARIANT_I) || defined(__HAVE_TLS_VARIANT_II)
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Elf_Addr tls_vaddr = 0; /* Noise GCC */
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#endif
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Elf_Addr phdr_vaddr;
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size_t phdr_memsz;
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#if defined(__HAVE_TLS_VARIANT_I) || defined(__HAVE_TLS_VARIANT_II)
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caddr_t gap_addr;
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size_t gap_size;
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#endif
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int i;
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#ifdef RTLD_LOADER
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Elf_Addr clear_vaddr;
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caddr_t clear_addr;
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size_t nclear;
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#endif
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if (sb != NULL && sb->st_size < (off_t)sizeof (Elf_Ehdr)) {
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_rtld_error("%s: not ELF file (too short)", path);
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return NULL;
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}
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obj = _rtld_obj_new();
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obj->path = xstrdup(path);
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obj->pathlen = strlen(path);
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if (sb != NULL) {
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obj->dev = sb->st_dev;
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obj->ino = sb->st_ino;
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}
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#ifdef __minix
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ehdr = minix_mmap(NULL, _rtld_pagesz, PROT_READ|PROT_WRITE,
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MAP_PREALLOC|MAP_ANON, -1, (off_t)0);
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Pread(ehdr, _rtld_pagesz, fd, 0);
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#if MINIXVERBOSE
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fprintf(stderr, "minix mmap for header: 0x%lx\n", ehdr);
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#endif
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#else
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ehdr = mmap(NULL, _rtld_pagesz, PROT_READ, MAP_FILE | MAP_SHARED, fd,
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(off_t)0);
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#endif
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obj->ehdr = ehdr;
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if (ehdr == MAP_FAILED) {
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_rtld_error("%s: read error: %s", path, xstrerror(errno));
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goto bad;
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}
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/* Make sure the file is valid */
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if (memcmp(ELFMAG, ehdr->e_ident, SELFMAG) != 0) {
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_rtld_error("%s: not ELF file (magic number bad)", path);
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goto bad;
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}
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if (ehdr->e_ident[EI_CLASS] != ELFCLASS) {
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_rtld_error("%s: invalid ELF class %x; expected %x", path,
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ehdr->e_ident[EI_CLASS], ELFCLASS);
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goto bad;
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}
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/* Elf_e_ident includes class */
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if (ehdr->e_ident[EI_VERSION] != EV_CURRENT ||
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ehdr->e_version != EV_CURRENT ||
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ehdr->e_ident[EI_DATA] != ELFDEFNNAME(MACHDEP_ENDIANNESS)) {
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_rtld_error("%s: unsupported file version", path);
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goto bad;
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}
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if (ehdr->e_type != ET_EXEC && ehdr->e_type != ET_DYN) {
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_rtld_error("%s: unsupported file type", path);
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goto bad;
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}
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switch (ehdr->e_machine) {
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ELFDEFNNAME(MACHDEP_ID_CASES)
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default:
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_rtld_error("%s: unsupported machine", path);
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goto bad;
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}
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/*
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* We rely on the program header being in the first page. This is
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* not strictly required by the ABI specification, but it seems to
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* always true in practice. And, it simplifies things considerably.
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*/
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assert(ehdr->e_phentsize == sizeof(Elf_Phdr));
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assert(ehdr->e_phoff + ehdr->e_phnum * sizeof(Elf_Phdr) <=
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_rtld_pagesz);
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/*
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* Scan the program header entries, and save key information.
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*
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* We rely on there being exactly two load segments, text and data,
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* in that order.
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*/
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phdr = (Elf_Phdr *) ((caddr_t)ehdr + ehdr->e_phoff);
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#if defined(__HAVE_TLS_VARIANT_I) || defined(__HAVE_TLS_VARIANT_II)
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phtls = NULL;
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#endif
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phsize = ehdr->e_phnum * sizeof(phdr[0]);
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obj->phdr = NULL;
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phdr_vaddr = EA_UNDEF;
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phdr_memsz = 0;
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phlimit = phdr + ehdr->e_phnum;
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nsegs = 0;
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while (phdr < phlimit) {
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switch (phdr->p_type) {
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case PT_INTERP:
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obj->interp = (void *)(uintptr_t)phdr->p_vaddr;
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dbg(("%s: PT_INTERP %p", obj->path, obj->interp));
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break;
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case PT_LOAD:
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if (nsegs < 2)
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segs[nsegs] = phdr;
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++nsegs;
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#if ELFSIZE == 64
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#define PRImemsz PRIu64
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#else
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#define PRImemsz PRIu32
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#endif
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dbg(("%s: %s %p phsize %" PRImemsz, obj->path, "PT_LOAD",
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(void *)(uintptr_t)phdr->p_vaddr, phdr->p_memsz));
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break;
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case PT_PHDR:
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phdr_vaddr = phdr->p_vaddr;
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phdr_memsz = phdr->p_memsz;
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dbg(("%s: %s %p phsize %" PRImemsz, obj->path, "PT_PHDR",
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(void *)(uintptr_t)phdr->p_vaddr, phdr->p_memsz));
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break;
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case PT_DYNAMIC:
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obj->dynamic = (void *)(uintptr_t)phdr->p_vaddr;
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dbg(("%s: %s %p phsize %" PRImemsz, obj->path, "PT_DYNAMIC",
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(void *)(uintptr_t)phdr->p_vaddr, phdr->p_memsz));
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break;
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#if defined(__HAVE_TLS_VARIANT_I) || defined(__HAVE_TLS_VARIANT_II)
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case PT_TLS:
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phtls = phdr;
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dbg(("%s: %s %p phsize %" PRImemsz, obj->path, "PT_TLS",
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(void *)(uintptr_t)phdr->p_vaddr, phdr->p_memsz));
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break;
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#endif
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}
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++phdr;
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}
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phdr = (Elf_Phdr *) ((caddr_t)ehdr + ehdr->e_phoff);
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obj->entry = (void *)(uintptr_t)ehdr->e_entry;
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if (!obj->dynamic) {
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_rtld_error("%s: not dynamically linked", path);
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goto bad;
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}
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if (nsegs != 2) {
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_rtld_error("%s: wrong number of segments (%d != 2)", path,
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nsegs);
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goto bad;
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}
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/*
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* Map the entire address space of the object as a file
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* region to stake out our contiguous region and establish a
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* base for relocation. We use a file mapping so that
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* the kernel will give us whatever alignment is appropriate
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* for the platform we're running on.
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*
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* We map it using the text protection, map the data segment
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* into the right place, then map an anon segment for the bss
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* and unmap the gaps left by padding to alignment.
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*/
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#ifdef MAP_ALIGNED
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base_alignment = segs[0]->p_align;
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#endif
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base_offset = round_down(segs[0]->p_offset);
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base_vaddr = round_down(segs[0]->p_vaddr);
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base_vlimit = round_up(segs[1]->p_vaddr + segs[1]->p_memsz);
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text_vlimit = round_up(segs[0]->p_vaddr + segs[0]->p_memsz);
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text_flags = protflags(segs[0]->p_flags);
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data_offset = round_down(segs[1]->p_offset);
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data_vaddr = round_down(segs[1]->p_vaddr);
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data_vlimit = round_up(segs[1]->p_vaddr + segs[1]->p_filesz);
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data_flags = protflags(segs[1]->p_flags);
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#ifdef RTLD_LOADER
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clear_vaddr = segs[1]->p_vaddr + segs[1]->p_filesz;
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#endif
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obj->textsize = text_vlimit - base_vaddr;
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obj->vaddrbase = base_vaddr;
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obj->isdynamic = ehdr->e_type == ET_DYN;
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#if defined(__HAVE_TLS_VARIANT_I) || defined(__HAVE_TLS_VARIANT_II)
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if (phtls != NULL) {
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++_rtld_tls_dtv_generation;
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obj->tlsindex = ++_rtld_tls_max_index;
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obj->tlssize = phtls->p_memsz;
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obj->tlsalign = phtls->p_align;
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obj->tlsinitsize = phtls->p_filesz;
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tls_vaddr = phtls->p_vaddr;
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}
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#endif
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obj->phdr_loaded = false;
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for (i = 0; i < nsegs; i++) {
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if (phdr_vaddr != EA_UNDEF &&
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segs[i]->p_vaddr <= phdr_vaddr &&
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segs[i]->p_memsz >= phdr_memsz) {
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obj->phdr_loaded = true;
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break;
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}
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if (segs[i]->p_offset <= ehdr->e_phoff &&
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segs[i]->p_memsz >= phsize) {
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phdr_vaddr = segs[i]->p_vaddr + ehdr->e_phoff;
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phdr_memsz = phsize;
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obj->phdr_loaded = true;
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break;
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}
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}
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if (obj->phdr_loaded) {
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obj->phdr = (void *)(uintptr_t)phdr_vaddr;
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obj->phsize = phdr_memsz;
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} else {
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Elf_Phdr *buf;
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buf = xmalloc(phsize);
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if (buf == NULL) {
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_rtld_error("%s: cannot allocate program header", path);
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goto bad;
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}
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memcpy(buf, phdr, phsize);
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obj->phdr = buf;
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obj->phsize = phsize;
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}
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dbg(("%s: phdr %p phsize %zu (%s)", obj->path, obj->phdr, obj->phsize,
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obj->phdr_loaded ? "loaded" : "allocated"));
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/* Unmap header if it overlaps the first load section. */
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if (base_offset < _rtld_pagesz) {
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munmap(ehdr, _rtld_pagesz);
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|
obj->ehdr = MAP_FAILED;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Calculate log2 of the base section alignment.
|
||
|
|
*/
|
||
|
|
mapflags = 0;
|
||
|
|
#ifdef MAP_ALIGNED
|
||
|
|
if (base_alignment > _rtld_pagesz) {
|
||
|
|
unsigned int log2 = 0;
|
||
|
|
for (; base_alignment > 1; base_alignment >>= 1)
|
||
|
|
log2++;
|
||
|
|
mapflags = MAP_ALIGNED(log2);
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifdef RTLD_LOADER
|
||
|
|
base_addr = obj->isdynamic ? NULL : (caddr_t)base_vaddr;
|
||
|
|
#else
|
||
|
|
base_addr = NULL;
|
||
|
|
#endif
|
||
|
|
mapsize = base_vlimit - base_vaddr;
|
||
|
|
|
||
|
|
#ifndef __minix
|
||
|
|
mapbase = mmap(base_addr, mapsize, text_flags,
|
||
|
|
mapflags | MAP_FILE | MAP_PRIVATE, fd, base_offset);
|
||
|
|
#else
|
||
|
|
mapbase = minix_mmap(base_addr, mapsize, PROT_READ|PROT_WRITE,
|
||
|
|
MAP_ANON | MAP_PREALLOC, -1, 0);
|
||
|
|
#if MINIXVERBOSE
|
||
|
|
fprintf(stderr, "minix mmap for whole block: 0x%lx-0x%lx\n", mapbase, mapbase+mapsize);
|
||
|
|
#endif
|
||
|
|
Pread(mapbase, obj->textsize, fd, 0);
|
||
|
|
#endif
|
||
|
|
if (mapbase == MAP_FAILED) {
|
||
|
|
_rtld_error("mmap of entire address space failed: %s",
|
||
|
|
xstrerror(errno));
|
||
|
|
goto bad;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Overlay the data segment onto the proper region. */
|
||
|
|
data_addr = mapbase + (data_vaddr - base_vaddr);
|
||
|
|
#ifdef __minix
|
||
|
|
Pread(data_addr, data_vlimit - data_vaddr, fd, data_offset);
|
||
|
|
#else
|
||
|
|
if (mmap(data_addr, data_vlimit - data_vaddr, data_flags,
|
||
|
|
MAP_FILE | MAP_PRIVATE | MAP_FIXED, fd, data_offset) ==
|
||
|
|
MAP_FAILED) {
|
||
|
|
_rtld_error("mmap of data failed: %s", xstrerror(errno));
|
||
|
|
goto bad;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Overlay the bss segment onto the proper region. */
|
||
|
|
if (mmap(mapbase + data_vlimit - base_vaddr, base_vlimit - data_vlimit,
|
||
|
|
data_flags, MAP_ANON | MAP_PRIVATE | MAP_FIXED, -1, 0) ==
|
||
|
|
MAP_FAILED) {
|
||
|
|
_rtld_error("mmap of bss failed: %s", xstrerror(errno));
|
||
|
|
goto bad;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Unmap the gap between the text and data. */
|
||
|
|
gap_addr = mapbase + round_up(text_vlimit - base_vaddr);
|
||
|
|
gap_size = data_addr - gap_addr;
|
||
|
|
if (gap_size != 0 && mprotect(gap_addr, gap_size, PROT_NONE) == -1) {
|
||
|
|
_rtld_error("mprotect of text -> data gap failed: %s",
|
||
|
|
xstrerror(errno));
|
||
|
|
goto bad;
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifdef RTLD_LOADER
|
||
|
|
/* Clear any BSS in the last page of the data segment. */
|
||
|
|
clear_addr = mapbase + (clear_vaddr - base_vaddr);
|
||
|
|
if ((nclear = data_vlimit - clear_vaddr) > 0)
|
||
|
|
memset(clear_addr, 0, nclear);
|
||
|
|
|
||
|
|
/* Non-file portion of BSS mapped above. */
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#if defined(__HAVE_TLS_VARIANT_I) || defined(__HAVE_TLS_VARIANT_II)
|
||
|
|
if (phtls != NULL)
|
||
|
|
obj->tlsinit = mapbase + tls_vaddr;
|
||
|
|
#endif
|
||
|
|
|
||
|
|
obj->mapbase = mapbase;
|
||
|
|
obj->mapsize = mapsize;
|
||
|
|
obj->relocbase = mapbase - base_vaddr;
|
||
|
|
|
||
|
|
if (obj->dynamic)
|
||
|
|
obj->dynamic = (void *)(obj->relocbase + (Elf_Addr)(uintptr_t)obj->dynamic);
|
||
|
|
if (obj->entry)
|
||
|
|
obj->entry = (void *)(obj->relocbase + (Elf_Addr)(uintptr_t)obj->entry);
|
||
|
|
if (obj->interp)
|
||
|
|
obj->interp = (void *)(obj->relocbase + (Elf_Addr)(uintptr_t)obj->interp);
|
||
|
|
if (obj->phdr_loaded)
|
||
|
|
obj->phdr = (void *)(obj->relocbase + (Elf_Addr)(uintptr_t)obj->phdr);
|
||
|
|
|
||
|
|
return obj;
|
||
|
|
|
||
|
|
bad:
|
||
|
|
if (obj->ehdr != MAP_FAILED)
|
||
|
|
munmap(obj->ehdr, _rtld_pagesz);
|
||
|
|
if (mapbase != MAP_FAILED)
|
||
|
|
munmap(mapbase, mapsize);
|
||
|
|
_rtld_obj_free(obj);
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Given a set of ELF protection flags, return the corresponding protection
|
||
|
|
* flags for MMAP.
|
||
|
|
*/
|
||
|
|
static int
|
||
|
|
protflags(int elfflags)
|
||
|
|
{
|
||
|
|
int prot = 0;
|
||
|
|
|
||
|
|
if (elfflags & PF_R)
|
||
|
|
prot |= PROT_READ;
|
||
|
|
#ifdef RTLD_LOADER
|
||
|
|
if (elfflags & PF_W)
|
||
|
|
prot |= PROT_WRITE;
|
||
|
|
#endif
|
||
|
|
if (elfflags & PF_X)
|
||
|
|
prot |= PROT_EXEC;
|
||
|
|
return prot;
|
||
|
|
}
|