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Begin to implement ld.so

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This commit is contained in:
Pierre Pronchery 2021-10-02 05:25:31 +02:00
parent 7742236366
commit b3170af3e2
10 changed files with 644 additions and 4 deletions
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1
.gitignore vendored
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Makefile
*.o
*.swp

2
project.conf
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package=Loader
version=0.0.0
subdirs=tools
subdirs=src,tools
dist=Makefile,COPYING

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src/.gitignore vendored Normal file
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/ld.so
/ld.so-arm
/ld.so-i386
/ld.so-mips
/ld.so-sparc

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src/loader.c Normal file
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/* $Id$ */
/* Copyright (c) 2021 Pierre Pronchery <khorben@defora.org> */
/* This file is part of DeforaOS System Loader */
/* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
#define DEBUG
#include <sys/mman.h>
#include <stdarg.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <elf.h>
#include "loader.h"
#ifndef PROGNAME_LOADER
# define PROGNAME_LOADER "ld.so"
#endif
/* Loader */
/* private */
/* prototypes */
static int _error(int code, char const * format, ...);
/* public */
/* functions */
/* loader */
static int _loader_do(int fd, char const * filename, int argc, char * argv[]);
static int _do_phdr(int fd, char const * filename, Elf_Ehdr * ehdr);
static size_t _do_phdr_align_bits(unsigned long align);
static int _do_shdr(int fd, char const * filename, Elf_Ehdr * ehdr);
static int _do_shdr_rel(int fd, char const * filename, Elf_Shdr * shdr);
static int _do_shdr_rela(int fd, char const * filename, Elf_Shdr * shdr);
int loader(char const * filename, int argc, char * argv[])
{
int ret;
int fd;
if((fd = open(filename, O_RDONLY)) < 0)
return _error(2, "%s: %s", filename, strerror(errno));
ret = _loader_do(fd, filename, argc, argv);
close(fd);
return ret;
}
static int _loader_do(int fd, char const * filename, int argc, char * argv[])
{
int ret;
Elf_Ehdr ehdr;
if(read(fd, &ehdr, sizeof(ehdr)) != sizeof(ehdr))
return _error(2, "%s: %s", filename, strerror(errno));
/* sanity checks */
if(memcmp(ehdr.e_ident, ELFMAG, SELFMAG) != 0)
return _error(2, "%s: %s", filename, "Not an ELF file");
if(ehdr.e_version != EV_CURRENT)
return _error(2, "%s: %u: %s", filename, ehdr.e_version,
"Unsupported ELF version");
if(ehdr.e_ehsize != sizeof(ehdr))
return _error(2, "%s: %s", filename,
"Invalid or unsupported ELF file");
if((ret = _do_phdr(fd, filename, &ehdr)) != 0
|| (ret = _do_shdr(fd, filename, &ehdr)) != 0)
return ret;
#ifdef DEBUG
fprintf(stderr, "DEBUG: e_entry=%#lx\n", (unsigned long)ehdr.e_entry);
#endif
return 0;
}
static int _do_phdr(int fd, char const * filename, Elf_Ehdr * ehdr)
{
Elf_Phdr phdr;
size_t i;
char * addr;
int prot;
int flags;
int f;
off_t offset;
if(ehdr->e_phentsize != sizeof(phdr))
return _error(2, "%s: %s", filename,
"Invalid or unsupported ELF file");
if(lseek(fd, ehdr->e_phoff, SEEK_SET) != (off_t)ehdr->e_phoff)
return _error(2, "%s: %s", filename, strerror(errno));
for(i = 0; i < ehdr->e_phnum; i++)
{
if(read(fd, &phdr, sizeof(phdr)) != sizeof(phdr))
return _error(2, "%s: %s", filename,
"Invalid or unsupported ELF file");
#ifdef DEBUG
fprintf(stderr, "DEBUG: %zu: p_type=%u p_flags=%#x"
" p_offset=%#lx p_vaddr=%#lx, p_paddr=%#lx"
" p_filesz=%lu p_memsz=%lu p_align=%lu\n", i,
phdr.p_type, phdr.p_flags,
(unsigned long)phdr.p_offset,
(unsigned long)phdr.p_vaddr,
(unsigned long)phdr.p_paddr,
(unsigned long)phdr.p_filesz,
(unsigned long)phdr.p_memsz,
(unsigned long)phdr.p_align);
#endif
if(phdr.p_type != PT_LOAD)
continue;
prot = PROT_NONE;
prot |= (phdr.p_flags & PF_R) ? PROT_READ : 0;
prot |= (phdr.p_flags & PF_W) ? PROT_WRITE : 0;
prot |= (phdr.p_flags & PF_X) ? PROT_EXEC : 0;
flags = MAP_ALIGNED(_do_phdr_align_bits(phdr.p_align));
if(phdr.p_filesz == 0)
{
#if 0
addr = NULL;
#endif
flags |= MAP_ANON;
f = -1;
offset = 0;
}
else
{
#if 0
addr = (void *)phdr.p_vaddr;
#endif
flags |= MAP_FILE;
#if 0
if(phdr.p_vaddr != 0)
flags |= MAP_TRYFIXED;
#endif
if(prot & PROT_WRITE)
flags |= MAP_PRIVATE;
f = fd;
offset = phdr.p_offset;
}
#ifdef DEBUG
fprintf(stderr, "DEBUG: mmap(%p, %lu, %d, %d, %d, %lld)\n",
NULL, (unsigned long)phdr.p_memsz, prot, flags,
f, (long long)offset);
#endif
if((addr = mmap(NULL, phdr.p_memsz, prot, flags, f, offset))
== MAP_FAILED)
return _error(2, "%s: %s", filename, strerror(errno));
/* zero memory if relevant */
if(phdr.p_filesz > 0
&& prot & PROT_WRITE
&& phdr.p_memsz > phdr.p_filesz)
/* FIXME will crash if a page too far */
memset(&addr[phdr.p_filesz], 0,
phdr.p_memsz - phdr.p_filesz);
/* FIXME keep this value */
phdr.p_vaddr = (intptr_t)addr;
}
return 0;
}
static size_t _do_phdr_align_bits(unsigned long align)
{
size_t i = 0;
if(align == 0)
return 0;
for(i = 0; i < sizeof(align) * 8; i++)
if(align & (1 << i))
{
#ifdef DEBUG
fprintf(stderr, "DEBUG: %s(0x%lx) => %zu\n", __func__,
align, i);
#endif
return i;
}
return 0;
}
static int _do_shdr(int fd, char const * filename, Elf_Ehdr * ehdr)
{
int ret;
Elf_Shdr shdr;
size_t i;
off_t offset;
if(ehdr->e_shentsize != sizeof(shdr))
return _error(2, "%s: %s", filename,
"Invalid or unsupported ELF file");
if(lseek(fd, ehdr->e_shoff, SEEK_SET) != (off_t)ehdr->e_shoff)
return _error(2, "%s: %s", filename, strerror(errno));
for(i = 0; i < ehdr->e_shnum; i++)
{
if(read(fd, &shdr, sizeof(shdr)) != sizeof(shdr))
return _error(2, "%s: %s", filename,
"Invalid or unsupported ELF file");
#ifdef DEBUG
fprintf(stderr, "DEBUG: %zu: sh_name=%u sh_type=%u"
" sh_flags=%#lx sh_addr=%#lx sh_offset=%#lx"
" sh_size=%lu sh_link=%u sh_info=%u"
" sh_addralign=%#lx sh_entsize=%lu\n", i,
shdr.sh_name, shdr.sh_type,
(unsigned long)shdr.sh_flags,
(unsigned long)shdr.sh_addr,
(unsigned long)shdr.sh_offset,
(unsigned long)shdr.sh_size,
shdr.sh_link, shdr.sh_info,
(unsigned long)shdr.sh_addralign,
(unsigned long)shdr.sh_entsize);
#endif
if(shdr.sh_type == SHT_REL)
ret = _do_shdr_rel(fd, filename, &shdr);
else if(shdr.sh_type == SHT_RELA)
ret = _do_shdr_rela(fd, filename, &shdr);
else
continue;
if(ret != 0)
return ret;
offset = ehdr->e_shoff + i * sizeof(shdr);
if(lseek(fd, offset, SEEK_SET) != offset)
return _error(2, "%s: %s", filename, strerror(errno));
}
return 0;
}
static int _do_shdr_rel(int fd, char const * filename, Elf_Shdr * shdr)
{
Elf_Rel rel;
size_t i;
if(shdr->sh_entsize != sizeof(rel))
return _error(2, "%s: %s", filename,
"Invalid or unsupported ELF file");
if(lseek(fd, shdr->sh_offset, SEEK_SET) != (off_t)shdr->sh_offset)
return _error(2, "%s: %s", filename, strerror(errno));
for(i = 0; i + sizeof(rel) < shdr->sh_size; i += sizeof(rel))
{
if(read(fd, &rel, sizeof(rel)) != sizeof(rel))
return _error(2, "%s: %s", filename,
"Invalid or unsupported ELF file");
#ifdef DEBUG
fprintf(stderr, "DEBUG: %zu: r_offset=%#lx r_type=%lu \n", i,
(unsigned long)rel.r_offset,
(unsigned long)ELF_R_TYPE(rel.r_info));
#endif
switch(ELF_R_TYPE(rel.r_info))
{
#if defined(__amd64__)
case R_X86_64_NONE:
break;
case R_X86_64_GLOB_DAT:
case R_X86_64_JUMP_SLOT:
case R_X86_64_RELATIVE:
/* FIXME implement */
break;
#endif
default:
return _error(2, "%s: %lu:"
" Unsupported relocation\n",
filename,
ELF_R_TYPE(rel.r_info));
}
}
return 0;
}
static int _do_shdr_rela(int fd, char const * filename, Elf_Shdr * shdr)
{
Elf_Rela rela;
size_t i;
if(shdr->sh_entsize != sizeof(rela))
return _error(2, "%s: %s", filename,
"Invalid or unsupported ELF file");
if(lseek(fd, shdr->sh_offset, SEEK_SET) != (off_t)shdr->sh_offset)
return _error(2, "%s: %s", filename, strerror(errno));
for(i = 0; i + sizeof(rela) < shdr->sh_size; i += sizeof(rela))
{
if(read(fd, &rela, sizeof(rela)) != sizeof(rela))
return _error(2, "%s: %s", filename,
"Invalid or unsupported ELF file");
#ifdef DEBUG
fprintf(stderr, "DEBUG: %zu: r_offset=%#lx r_type=%lu"
" r_addend=%ld\n", i,
(unsigned long)rela.r_offset,
(unsigned long)ELF_R_TYPE(rela.r_info),
(long)rela.r_addend);
#endif
switch(ELF_R_TYPE(rela.r_info))
{
#if defined(__amd64__)
case R_X86_64_NONE:
break;
case R_X86_64_GLOB_DAT:
case R_X86_64_JUMP_SLOT:
case R_X86_64_RELATIVE:
/* FIXME implement */
break;
#endif
default:
return _error(2, "%s: %lu:"
" Unsupported relocation\n",
filename,
ELF_R_TYPE(rela.r_info));
}
}
return 0;
}
/* private */
/* functions */
/* error */
static int _error(int code, char const * format, ...)
{
va_list ap;
fputs(PROGNAME_LOADER ": ", stderr);
va_start(ap, format);
vfprintf(stderr, format, ap);
va_end(ap);
fputs("\n", stderr);
return code;
}

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src/loader.h Normal file
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/* $Id$ */
/* Copyright (c) 2021 Pierre Pronchery <khorben@defora.org> */
/* This file is part of DeforaOS System Loader */
/* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
#ifndef LOADER_LOADER_H
# define LOADER_LOADER_H
/* Loader */
/* public */
/* functions */
int loader(char const * filename, int argc, char * argv[]);
#endif /* !LOADER_LOADER_H */

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src/loader32.c Normal file
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/* $Id$ */
/* Copyright (c) 2021 Pierre Pronchery <khorben@defora.org> */
/* This file is part of DeforaOS System Loader */
/* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
#include "loader.c"

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src/main.c Normal file
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/* $Id$ */
/* Copyright (c) 2021 Pierre Pronchery <khorben@defora.org> */
/* This file is part of DeforaOS System Loader */
/* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
#include <unistd.h>
#include <stdio.h>
#include "loader.h"
#ifndef PROGNAME_LOADER
# define PROGNAME_LOADER "ld.so"
#endif
/* private */
/* prototypes */
static int _usage(void);
/* functions */
static int _usage(void)
{
fputs("Usage: " PROGNAME_LOADER " [-f filename] file [argument...]\n",
stderr);
return 1;
}
/* public */
/* functions */
/* main */
int main(int argc, char * argv[])
{
int o;
char const * filename = NULL;
while((o = getopt(argc, argv, "f:")) != -1)
switch(o)
{
case 'f':
filename = optarg;
break;
default:
return _usage();
}
if(optind == argc)
return _usage();
if(filename == NULL)
filename = argv[optind];
return loader(filename, argc - optind, &argv[optind]);
}

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/* $Id$ */
/* Copyright (c) 2021 Pierre Pronchery <khorben@defora.org> */
/* This file is part of DeforaOS System Loader */
/* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
#include "main.c"

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targets=ld.so,ld.so-i386
cppflags_force=
cflags_force=-g
cflags=-W -Wall -O2 -D_FORTIFY_SOURCE=2 -fstack-protector
ldflags_force=-static
ldflags=-Wl,-z,relro -Wl,-z,now
dist=Makefile,loader.h
mode=amd64-debug
#modes
[mode::aarch64-debug]
targets=ld.so,ld.so-arm
[mode::aarch64-release]
targets=ld.so,ld.so-arm
cppflags_force=-DNDEBUG
cflags_force=
[mode::amd64-release]
cppflags_force=-DNDEBUG
cflags_force=
[mode::i386-debug]
targets=ld.so
dist=Makefile,loader.h,loader32.c,main32.c
[mode::i386-release]
targets=ld.so
cppflags_force=-DNDEBUG
cflags_force=
dist=Makefile,loader.h,loader32.c,main32.c
[mode::mips64-debug]
targets=ld.so,ld.so-mips
[mode::mips64-release]
targets=ld.so,ld.so-mips
cppflags_force=-DNDEBUG
cflags_force=
[mode::sparc64-debug]
targets=ld.so,ld.so-sparc
[mode::sparc64-release]
targets=ld.so,ld.so-sparc
cppflags_force=-DNDEBUG
cflags_force=
#targets
[ld.so]
type=binary
sources=loader.c,main.c
install=$(PREFIX)/libexec
[ld.so-arm]
type=binary
sources=loader32.c,main32.c
cflags=-m32
ldflags=-m32
install=$(PREFIX)/libexec
[ld.so-i386]
type=binary
sources=loader32.c,main32.c
cflags=-m32
ldflags=-m32
install=$(PREFIX)/libexec
[ld.so-mips]
type=binary
sources=loader32.c,main32.c
cflags=-m32
ldflags=-m32
install=$(PREFIX)/libexec
[ld.so-sparc]
type=binary
sources=loader32.c,main32.c
cflags=-m32
ldflags=-m32
install=$(PREFIX)/libexec
#sources
[loader.c]
depends=loader.h
[loader32.c]
depends=loader.h,loader.c
[main.c]
depends=loader.h
[main32.c]
depends=loader.h,main.c

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tools/project.conf
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targets=ldd
cppflags_force=
cflags_force=-g
cflags=-W -Wall -O2 -pedantic -D_FORTIFY_SOURCE=2 -fstack-protector
cflags=-W -Wall -O2 -D_FORTIFY_SOURCE=2 -fstack-protector
ldflags=-Wl,-z,relro -Wl,-z,now
dist=Makefile,elf.c
mode=debug
mode=amd64-debug
#modes
[mode::release]
[mode::aarch64-release]
cppflags_force=-DNDEBUG
cflags_force=
[mode::amd64-release]
cppflags_force=-DNDEBUG
cflags_force=
[mode::i386-release]
cppflags_force=-DNDEBUG
cflags_force=
[mode::mips64-release]
cppflags_force=-DNDEBUG
cflags_force=
[mode::sparc64-release]
cppflags_force=-DNDEBUG
cflags_force=