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load_elf.c
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/*-
* Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
* Copyright (c) 1998 Peter Wemm <peter@freebsd.org>
* 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 AUTHOR 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 AUTHOR 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 <sys/param.h>
#include <sys/endian.h>
#include <sys/exec.h>
#include <sys/linker.h>
#include <sys/module.h>
#include <sys/stdint.h>
#include <string.h>
#include <machine/elf.h>
#include <stand.h>
#include <sys/link_elf.h>
#include "bootstrap.h"
#define COPYOUT(s,d,l) archsw.arch_copyout((vm_offset_t)(s), d, l)
#if defined(__i386__) && __ELF_WORD_SIZE == 64
#undef ELF_TARG_CLASS
#undef ELF_TARG_MACH
#define ELF_TARG_CLASS ELFCLASS64
#define ELF_TARG_MACH EM_X86_64
#endif
typedef struct elf_file {
Elf_Phdr *ph;
Elf_Ehdr *ehdr;
Elf_Sym *symtab;
Elf_Hashelt *hashtab;
Elf_Hashelt nbuckets;
Elf_Hashelt nchains;
Elf_Hashelt *buckets;
Elf_Hashelt *chains;
Elf_Rel *rel;
size_t relsz;
Elf_Rela *rela;
size_t relasz;
char *strtab;
size_t strsz;
int fd;
caddr_t firstpage;
size_t firstlen;
int kernel;
uint64_t off;
#ifdef LOADER_VERIEXEC_VECTX
struct vectx *vctx;
#endif
} *elf_file_t;
#ifdef LOADER_VERIEXEC_VECTX
#define VECTX_HANDLE(ef) (ef)->vctx
#else
#define VECTX_HANDLE(ef) (ef)->fd
#endif
static int __elfN(loadimage)(struct preloaded_file *mp, elf_file_t ef,
uint64_t loadaddr);
static int __elfN(lookup_symbol)(elf_file_t ef, const char* name,
Elf_Sym *sym, unsigned char type);
static int __elfN(reloc_ptr)(struct preloaded_file *mp, elf_file_t ef,
Elf_Addr p, void *val, size_t len);
static int __elfN(parse_modmetadata)(struct preloaded_file *mp, elf_file_t ef,
Elf_Addr p_start, Elf_Addr p_end);
static symaddr_fn __elfN(symaddr);
static char *fake_modname(const char *name);
const char *__elfN(kerneltype) = "elf kernel";
const char *__elfN(moduletype) = "elf module";
uint64_t __elfN(relocation_offset) = 0;
#ifdef __powerpc__
extern void elf_wrong_field_size(void);
#define CONVERT_FIELD(b, f, e) \
switch (sizeof((b)->f)) { \
case 2: \
(b)->f = e ## 16toh((b)->f); \
break; \
case 4: \
(b)->f = e ## 32toh((b)->f); \
break; \
case 8: \
(b)->f = e ## 64toh((b)->f); \
break; \
default: \
/* Force a link time error. */ \
elf_wrong_field_size(); \
break; \
}
#define CONVERT_SWITCH(h, d, f) \
switch ((h)->e_ident[EI_DATA]) { \
case ELFDATA2MSB: \
f(d, be); \
break; \
case ELFDATA2LSB: \
f(d, le); \
break; \
default: \
return (EINVAL); \
}
static int elf_header_convert(Elf_Ehdr *ehdr)
{
/*
* Fixup ELF header endianness.
*
* The Xhdr structure was loaded using block read call to optimize file
* accesses. It might happen, that the endianness of the system memory
* is different that endianness of the ELF header. Swap fields here to
* guarantee that Xhdr always contain valid data regardless of
* architecture.
*/
#define HEADER_FIELDS(b, e) \
CONVERT_FIELD(b, e_type, e); \
CONVERT_FIELD(b, e_machine, e); \
CONVERT_FIELD(b, e_version, e); \
CONVERT_FIELD(b, e_entry, e); \
CONVERT_FIELD(b, e_phoff, e); \
CONVERT_FIELD(b, e_shoff, e); \
CONVERT_FIELD(b, e_flags, e); \
CONVERT_FIELD(b, e_ehsize, e); \
CONVERT_FIELD(b, e_phentsize, e); \
CONVERT_FIELD(b, e_phnum, e); \
CONVERT_FIELD(b, e_shentsize, e); \
CONVERT_FIELD(b, e_shnum, e); \
CONVERT_FIELD(b, e_shstrndx, e)
CONVERT_SWITCH(ehdr, ehdr, HEADER_FIELDS);
#undef HEADER_FIELDS
return (0);
}
static int elf_program_header_convert(const Elf_Ehdr *ehdr, Elf_Phdr *phdr)
{
#define PROGRAM_HEADER_FIELDS(b, e) \
CONVERT_FIELD(b, p_type, e); \
CONVERT_FIELD(b, p_flags, e); \
CONVERT_FIELD(b, p_offset, e); \
CONVERT_FIELD(b, p_vaddr, e); \
CONVERT_FIELD(b, p_paddr, e); \
CONVERT_FIELD(b, p_filesz, e); \
CONVERT_FIELD(b, p_memsz, e); \
CONVERT_FIELD(b, p_align, e)
CONVERT_SWITCH(ehdr, phdr, PROGRAM_HEADER_FIELDS);
#undef PROGRAM_HEADER_FIELDS
return (0);
}
static int elf_section_header_convert(const Elf_Ehdr *ehdr, Elf_Shdr *shdr)
{
#define SECTION_HEADER_FIELDS(b, e) \
CONVERT_FIELD(b, sh_name, e); \
CONVERT_FIELD(b, sh_type, e); \
CONVERT_FIELD(b, sh_link, e); \
CONVERT_FIELD(b, sh_info, e); \
CONVERT_FIELD(b, sh_flags, e); \
CONVERT_FIELD(b, sh_addr, e); \
CONVERT_FIELD(b, sh_offset, e); \
CONVERT_FIELD(b, sh_size, e); \
CONVERT_FIELD(b, sh_addralign, e); \
CONVERT_FIELD(b, sh_entsize, e)
CONVERT_SWITCH(ehdr, shdr, SECTION_HEADER_FIELDS);
#undef SECTION_HEADER_FIELDS
return (0);
}
#undef CONVERT_SWITCH
#undef CONVERT_FIELD
#else
static int elf_header_convert(Elf_Ehdr *ehdr)
{
return (0);
}
static int elf_program_header_convert(const Elf_Ehdr *ehdr, Elf_Phdr *phdr)
{
return (0);
}
static int elf_section_header_convert(const Elf_Ehdr *ehdr, Elf_Shdr *shdr)
{
return (0);
}
#endif
#ifdef __amd64__
static bool
is_kernphys_relocatable(elf_file_t ef)
{
Elf_Sym sym;
return (__elfN(lookup_symbol)(ef, "kernphys", &sym, STT_OBJECT) == 0);
}
#endif
#ifdef __i386__
static bool
is_tg_kernel_support(struct preloaded_file *fp, elf_file_t ef)
{
Elf_Sym sym;
Elf_Addr p_start, p_end, v, p;
char vd_name[16];
int error;
if (__elfN(lookup_symbol)(ef, "__start_set_vt_drv_set", &sym, STT_NOTYPE) != 0)
return (false);
p_start = sym.st_value + ef->off;
if (__elfN(lookup_symbol)(ef, "__stop_set_vt_drv_set", &sym, STT_NOTYPE) != 0)
return (false);
p_end = sym.st_value + ef->off;
/*
* Walk through vt_drv_set, each vt driver structure starts with
* static 16 chars for driver name. If we have "vbefb", return true.
*/
for (p = p_start; p < p_end; p += sizeof(Elf_Addr)) {
COPYOUT(p, &v, sizeof(v));
error = __elfN(reloc_ptr)(fp, ef, p, &v, sizeof(v));
if (error == EOPNOTSUPP)
v += ef->off;
else if (error != 0)
return (false);
COPYOUT(v, &vd_name, sizeof(vd_name));
if (strncmp(vd_name, "vbefb", sizeof(vd_name)) == 0)
return (true);
}
return (false);
}
#endif
static int
__elfN(load_elf_header)(char *filename, elf_file_t ef)
{
ssize_t bytes_read;
Elf_Ehdr *ehdr;
int err;
/*
* Open the image, read and validate the ELF header
*/
if (filename == NULL) /* can't handle nameless */
return (EFTYPE);
if ((ef->fd = open(filename, O_RDONLY)) == -1)
return (errno);
ef->firstpage = malloc(PAGE_SIZE);
if (ef->firstpage == NULL) {
close(ef->fd);
return (ENOMEM);
}
preload(ef->fd);
#ifdef LOADER_VERIEXEC_VECTX
{
int verror;
ef->vctx = vectx_open(ef->fd, filename, 0L, NULL, &verror, __func__);
if (verror) {
printf("Unverified %s: %s\n", filename, ve_error_get());
close(ef->fd);
free(ef->vctx);
return (EAUTH);
}
}
#endif
bytes_read = VECTX_READ(VECTX_HANDLE(ef), ef->firstpage, PAGE_SIZE);
ef->firstlen = (size_t)bytes_read;
if (bytes_read < 0 || ef->firstlen <= sizeof(Elf_Ehdr)) {
err = EFTYPE; /* could be EIO, but may be small file */
goto error;
}
ehdr = ef->ehdr = (Elf_Ehdr *)ef->firstpage;
/* Is it ELF? */
if (!IS_ELF(*ehdr)) {
err = EFTYPE;
goto error;
}
if (ehdr->e_ident[EI_CLASS] != ELF_TARG_CLASS || /* Layout ? */
ehdr->e_ident[EI_DATA] != ELF_TARG_DATA ||
ehdr->e_ident[EI_VERSION] != EV_CURRENT) /* Version ? */ {
err = EFTYPE;
goto error;
}
err = elf_header_convert(ehdr);
if (err)
goto error;
if (ehdr->e_version != EV_CURRENT || ehdr->e_machine != ELF_TARG_MACH) {
/* Machine ? */
err = EFTYPE;
goto error;
}
#if defined(LOADER_VERIEXEC) && !defined(LOADER_VERIEXEC_VECTX)
if (verify_file(ef->fd, filename, bytes_read, VE_MUST, __func__) < 0) {
err = EAUTH;
goto error;
}
#endif
return (0);
error:
if (ef->firstpage != NULL) {
free(ef->firstpage);
ef->firstpage = NULL;
}
if (ef->fd != -1) {
#ifdef LOADER_VERIEXEC_VECTX
free(ef->vctx);
#endif
close(ef->fd);
ef->fd = -1;
}
return (err);
}
/*
* Attempt to load the file (file) as an ELF module. It will be stored at
* (dest), and a pointer to a module structure describing the loaded object
* will be saved in (result).
*/
int
__elfN(loadfile)(char *filename, uint64_t dest, struct preloaded_file **result)
{
return (__elfN(loadfile_raw)(filename, dest, result, 0));
}
int
__elfN(loadfile_raw)(char *filename, uint64_t dest,
struct preloaded_file **result, int multiboot)
{
struct preloaded_file *fp, *kfp;
struct elf_file ef;
Elf_Ehdr *ehdr;
int err;
fp = NULL;
bzero(&ef, sizeof(struct elf_file));
ef.fd = -1;
err = __elfN(load_elf_header)(filename, &ef);
if (err != 0)
return (err);
ehdr = ef.ehdr;
/*
* Check to see what sort of module we are.
*/
kfp = file_findfile(NULL, __elfN(kerneltype));
#ifdef __powerpc__
/*
* Kernels can be ET_DYN, so just assume the first loaded object is the
* kernel. This assumption will be checked later.
*/
if (kfp == NULL)
ef.kernel = 1;
#endif
if (ef.kernel || ehdr->e_type == ET_EXEC) {
/* Looks like a kernel */
if (kfp != NULL) {
printf("elf" __XSTRING(__ELF_WORD_SIZE)
"_loadfile: kernel already loaded\n");
err = EPERM;
goto oerr;
}
/*
* Calculate destination address based on kernel entrypoint.
*
* For ARM, the destination address is independent of any values
* in the elf header (an ARM kernel can be loaded at any 2MB
* boundary), so we leave dest set to the value calculated by
* archsw.arch_loadaddr() and passed in to this function.
*/
#ifndef __arm__
if (ehdr->e_type == ET_EXEC)
dest = (ehdr->e_entry & ~PAGE_MASK);
#endif
if ((ehdr->e_entry & ~PAGE_MASK) == 0) {
printf("elf" __XSTRING(__ELF_WORD_SIZE)
"_loadfile: not a kernel (maybe static binary?)\n");
err = EPERM;
goto oerr;
}
ef.kernel = 1;
} else if (ehdr->e_type == ET_DYN) {
/* Looks like a kld module */
if (multiboot != 0) {
printf("elf" __XSTRING(__ELF_WORD_SIZE)
"_loadfile: can't load module as multiboot\n");
err = EPERM;
goto oerr;
}
if (kfp == NULL) {
printf("elf" __XSTRING(__ELF_WORD_SIZE)
"_loadfile: can't load module before kernel\n");
err = EPERM;
goto oerr;
}
if (strcmp(__elfN(kerneltype), kfp->f_type)) {
printf("elf" __XSTRING(__ELF_WORD_SIZE)
"_loadfile: can't load module with kernel type '%s'\n",
kfp->f_type);
err = EPERM;
goto oerr;
}
/* Looks OK, got ahead */
ef.kernel = 0;
} else {
err = EFTYPE;
goto oerr;
}
if (archsw.arch_loadaddr != NULL)
dest = archsw.arch_loadaddr(LOAD_ELF, ehdr, dest);
else
dest = roundup(dest, PAGE_SIZE);
/*
* Ok, we think we should handle this.
*/
fp = file_alloc();
if (fp == NULL) {
printf("elf" __XSTRING(__ELF_WORD_SIZE)
"_loadfile: cannot allocate module info\n");
err = EPERM;
goto out;
}
if (ef.kernel == 1 && multiboot == 0)
setenv("kernelname", filename, 1);
fp->f_name = strdup(filename);
if (multiboot == 0)
fp->f_type = strdup(ef.kernel ?
__elfN(kerneltype) : __elfN(moduletype));
else
fp->f_type = strdup("elf multiboot kernel");
if (module_verbose >= MODULE_VERBOSE_FULL) {
if (ef.kernel)
printf("%s entry at 0x%jx\n", filename,
(uintmax_t)ehdr->e_entry);
} else if (module_verbose > MODULE_VERBOSE_SILENT)
printf("%s ", filename);
fp->f_size = __elfN(loadimage)(fp, &ef, dest);
if (fp->f_size == 0 || fp->f_addr == 0)
goto ioerr;
/* save exec header as metadata */
file_addmetadata(fp, MODINFOMD_ELFHDR, sizeof(*ehdr), ehdr);
/* Load OK, return module pointer */
*result = (struct preloaded_file *)fp;
err = 0;
#ifdef __amd64__
fp->f_kernphys_relocatable = multiboot || is_kernphys_relocatable(&ef);
#endif
#ifdef __i386__
fp->f_tg_kernel_support = is_tg_kernel_support(fp, &ef);
#endif
goto out;
ioerr:
err = EIO;
oerr:
file_discard(fp);
out:
if (ef.firstpage)
free(ef.firstpage);
if (ef.fd != -1) {
#ifdef LOADER_VERIEXEC_VECTX
if (!err && ef.vctx) {
int verror;
verror = vectx_close(ef.vctx, VE_MUST, __func__);
if (verror) {
err = EAUTH;
file_discard(fp);
}
}
#endif
close(ef.fd);
}
return (err);
}
/*
* With the file (fd) open on the image, and (ehdr) containing
* the Elf header, load the image at (off)
*/
static int
__elfN(loadimage)(struct preloaded_file *fp, elf_file_t ef, uint64_t off)
{
int i;
u_int j;
Elf_Ehdr *ehdr;
Elf_Phdr *phdr, *php;
Elf_Shdr *shdr;
char *shstr;
int ret;
vm_offset_t firstaddr;
vm_offset_t lastaddr;
size_t chunk;
ssize_t result;
Elf_Addr ssym, esym;
Elf_Dyn *dp;
Elf_Addr adp;
Elf_Addr ctors;
int ndp;
int symstrindex;
int symtabindex;
Elf_Size size;
u_int fpcopy;
Elf_Sym sym;
Elf_Addr p_start, p_end;
dp = NULL;
shdr = NULL;
ret = 0;
firstaddr = lastaddr = 0;
ehdr = ef->ehdr;
#ifdef __powerpc__
if (ef->kernel) {
#else
if (ehdr->e_type == ET_EXEC) {
#endif
#if defined(__i386__) || defined(__amd64__)
#if __ELF_WORD_SIZE == 64
/* x86_64 relocates after locore */
off = - (off & 0xffffffffff000000ull);
#else
/* i386 relocates after locore */
off = - (off & 0xff000000u);
#endif
#elif defined(__powerpc__)
/*
* On the purely virtual memory machines like e500, the kernel
* is linked against its final VA range, which is most often
* not available at the loader stage, but only after kernel
* initializes and completes its VM settings. In such cases we
* cannot use p_vaddr field directly to load ELF segments, but
* put them at some 'load-time' locations.
*/
if (off & 0xf0000000u) {
off = -(off & 0xf0000000u);
/*
* XXX the physical load address should not be
* hardcoded. Note that the Book-E kernel assumes that
* it's loaded at a 16MB boundary for now...
*/
off += 0x01000000;
}
ehdr->e_entry += off;
if (module_verbose >= MODULE_VERBOSE_FULL)
printf("Converted entry 0x%jx\n",
(uintmax_t)ehdr->e_entry);
#elif defined(__arm__) && !defined(EFI)
/*
* The elf headers in arm kernels specify virtual addresses in
* all header fields, even the ones that should be physical
* addresses. We assume the entry point is in the first page,
* and masking the page offset will leave us with the virtual
* address the kernel was linked at. We subtract that from the
* load offset, making 'off' into the value which, when added
* to a virtual address in an elf header, translates it to a
* physical address. We do the va->pa conversion on the entry
* point address in the header now, so that later we can launch
* the kernel by just jumping to that address.
*
* When booting from UEFI the copyin and copyout functions
* handle adjusting the location relative to the first virtual
* address. Because of this there is no need to adjust the
* offset or entry point address as these will both be handled
* by the efi code.
*/
off -= ehdr->e_entry & ~PAGE_MASK;
ehdr->e_entry += off;
if (module_verbose >= MODULE_VERBOSE_FULL)
printf("ehdr->e_entry 0x%jx, va<->pa off %llx\n",
(uintmax_t)ehdr->e_entry, off);
#else
off = 0; /* other archs use direct mapped kernels */
#endif
}
ef->off = off;
if (ef->kernel)
__elfN(relocation_offset) = off;
if ((ehdr->e_phoff + ehdr->e_phnum * sizeof(*phdr)) > ef->firstlen) {
printf("elf" __XSTRING(__ELF_WORD_SIZE)
"_loadimage: program header not within first page\n");
goto out;
}
phdr = (Elf_Phdr *)(ef->firstpage + ehdr->e_phoff);
for (i = 0; i < ehdr->e_phnum; i++) {
if (elf_program_header_convert(ehdr, phdr))
continue;
/* We want to load PT_LOAD segments only.. */
if (phdr[i].p_type != PT_LOAD)
continue;
if (module_verbose >= MODULE_VERBOSE_FULL) {
printf("Segment: 0x%lx@0x%lx -> 0x%lx-0x%lx",
(long)phdr[i].p_filesz, (long)phdr[i].p_offset,
(long)(phdr[i].p_vaddr + off),
(long)(phdr[i].p_vaddr + off + phdr[i].p_memsz - 1));
} else if (module_verbose > MODULE_VERBOSE_SILENT) {
if ((phdr[i].p_flags & PF_W) == 0) {
printf("text=0x%lx ", (long)phdr[i].p_filesz);
} else {
printf("data=0x%lx", (long)phdr[i].p_filesz);
if (phdr[i].p_filesz < phdr[i].p_memsz)
printf("+0x%lx", (long)(phdr[i].p_memsz -
phdr[i].p_filesz));
printf(" ");
}
}
fpcopy = 0;
if (ef->firstlen > phdr[i].p_offset) {
fpcopy = ef->firstlen - phdr[i].p_offset;
archsw.arch_copyin(ef->firstpage + phdr[i].p_offset,
phdr[i].p_vaddr + off, fpcopy);
}
if (phdr[i].p_filesz > fpcopy) {
if (kern_pread(VECTX_HANDLE(ef),
phdr[i].p_vaddr + off + fpcopy,
phdr[i].p_filesz - fpcopy,
phdr[i].p_offset + fpcopy) != 0) {
printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
"_loadimage: read failed\n");
goto out;
}
}
/* clear space from oversized segments; eg: bss */
if (phdr[i].p_filesz < phdr[i].p_memsz) {
if (module_verbose >= MODULE_VERBOSE_FULL) {
printf(" (bss: 0x%lx-0x%lx)",
(long)(phdr[i].p_vaddr + off + phdr[i].p_filesz),
(long)(phdr[i].p_vaddr + off + phdr[i].p_memsz -1));
}
kern_bzero(phdr[i].p_vaddr + off + phdr[i].p_filesz,
phdr[i].p_memsz - phdr[i].p_filesz);
}
if (module_verbose >= MODULE_VERBOSE_FULL)
printf("\n");
if (archsw.arch_loadseg != NULL)
archsw.arch_loadseg(ehdr, phdr + i, off);
if (firstaddr == 0 || firstaddr > (phdr[i].p_vaddr + off))
firstaddr = phdr[i].p_vaddr + off;
if (lastaddr == 0 || lastaddr <
(phdr[i].p_vaddr + off + phdr[i].p_memsz))
lastaddr = phdr[i].p_vaddr + off + phdr[i].p_memsz;
}
lastaddr = roundup(lastaddr, sizeof(long));
/*
* Get the section headers. We need this for finding the .ctors
* section as well as for loading any symbols. Both may be hard
* to do if reading from a .gz file as it involves seeking. I
* think the rule is going to have to be that you must strip a
* file to remove symbols before gzipping it.
*/
chunk = (size_t)ehdr->e_shnum * (size_t)ehdr->e_shentsize;
if (chunk == 0 || ehdr->e_shoff == 0)
goto nosyms;
shdr = alloc_pread(VECTX_HANDLE(ef), ehdr->e_shoff, chunk);
if (shdr == NULL) {
printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
"_loadimage: failed to read section headers");
goto nosyms;
}
for (i = 0; i < ehdr->e_shnum; i++)
elf_section_header_convert(ehdr, &shdr[i]);
file_addmetadata(fp, MODINFOMD_SHDR, chunk, shdr);
/*
* Read the section string table and look for the .ctors section.
* We need to tell the kernel where it is so that it can call the
* ctors.
*/
chunk = shdr[ehdr->e_shstrndx].sh_size;
if (chunk) {
shstr = alloc_pread(VECTX_HANDLE(ef),
shdr[ehdr->e_shstrndx].sh_offset, chunk);
if (shstr) {
for (i = 0; i < ehdr->e_shnum; i++) {
if (strcmp(shstr + shdr[i].sh_name,
".ctors") != 0)
continue;
ctors = shdr[i].sh_addr;
file_addmetadata(fp, MODINFOMD_CTORS_ADDR,
sizeof(ctors), &ctors);
size = shdr[i].sh_size;
file_addmetadata(fp, MODINFOMD_CTORS_SIZE,
sizeof(size), &size);
break;
}
free(shstr);
}
}
/*
* Now load any symbols.
*/
symtabindex = -1;
symstrindex = -1;
for (i = 0; i < ehdr->e_shnum; i++) {
if (shdr[i].sh_type != SHT_SYMTAB)
continue;
for (j = 0; j < ehdr->e_phnum; j++) {
if (phdr[j].p_type != PT_LOAD)
continue;
if (shdr[i].sh_offset >= phdr[j].p_offset &&
(shdr[i].sh_offset + shdr[i].sh_size <=
phdr[j].p_offset + phdr[j].p_filesz)) {
shdr[i].sh_offset = 0;
shdr[i].sh_size = 0;
break;
}
}
if (shdr[i].sh_offset == 0 || shdr[i].sh_size == 0)
continue; /* alread loaded in a PT_LOAD above */
/* Save it for loading below */
symtabindex = i;
symstrindex = shdr[i].sh_link;
}
if (symtabindex < 0 || symstrindex < 0)
goto nosyms;
/* Ok, committed to a load. */
if (module_verbose >= MODULE_VERBOSE_FULL)
printf("syms=[");
ssym = lastaddr;
for (i = symtabindex; i >= 0; i = symstrindex) {
char *secname;
switch(shdr[i].sh_type) {
case SHT_SYMTAB: /* Symbol table */
secname = "symtab";
break;
case SHT_STRTAB: /* String table */
secname = "strtab";
break;
default:
secname = "WHOA!!";
break;
}
size = shdr[i].sh_size;
archsw.arch_copyin(&size, lastaddr, sizeof(size));
lastaddr += sizeof(size);
if (module_verbose >= MODULE_VERBOSE_FULL) {
printf("\n%s: 0x%jx@0x%jx -> 0x%jx-0x%jx", secname,
(uintmax_t)shdr[i].sh_size, (uintmax_t)shdr[i].sh_offset,
(uintmax_t)lastaddr,
(uintmax_t)(lastaddr + shdr[i].sh_size));
} else if (module_verbose > MODULE_VERBOSE_SILENT) {
if (i == symstrindex)
printf("+");
printf("0x%lx+0x%lx", (long)sizeof(size), (long)size);
}
if (VECTX_LSEEK(VECTX_HANDLE(ef), (off_t)shdr[i].sh_offset, SEEK_SET) == -1) {
printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
"_loadimage: could not seek for symbols - skipped!");
lastaddr = ssym;
ssym = 0;
goto nosyms;
}
result = archsw.arch_readin(VECTX_HANDLE(ef), lastaddr, shdr[i].sh_size);
if (result < 0 || (size_t)result != shdr[i].sh_size) {
printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
"_loadimage: could not read symbols - skipped! "
"(%ju != %ju)", (uintmax_t)result,
(uintmax_t)shdr[i].sh_size);
lastaddr = ssym;
ssym = 0;
goto nosyms;
}
/* Reset offsets relative to ssym */
lastaddr += shdr[i].sh_size;
lastaddr = roundup(lastaddr, sizeof(size));
if (i == symtabindex)
symtabindex = -1;
else if (i == symstrindex)
symstrindex = -1;
}
esym = lastaddr;
if (module_verbose >= MODULE_VERBOSE_FULL)
printf("]");
file_addmetadata(fp, MODINFOMD_SSYM, sizeof(ssym), &ssym);
file_addmetadata(fp, MODINFOMD_ESYM, sizeof(esym), &esym);
nosyms:
if (module_verbose > MODULE_VERBOSE_SILENT)
printf("\n");
ret = lastaddr - firstaddr;
fp->f_addr = firstaddr;
php = NULL;
for (i = 0; i < ehdr->e_phnum; i++) {
if (phdr[i].p_type == PT_DYNAMIC) {
php = phdr + i;
adp = php->p_vaddr;
file_addmetadata(fp, MODINFOMD_DYNAMIC, sizeof(adp),
&adp);
break;
}
}
if (php == NULL) /* this is bad, we cannot get to symbols or _DYNAMIC */
goto out;
ndp = php->p_filesz / sizeof(Elf_Dyn);
if (ndp == 0)
goto out;
dp = malloc(php->p_filesz);
if (dp == NULL)
goto out;
archsw.arch_copyout(php->p_vaddr + off, dp, php->p_filesz);
ef->strsz = 0;
for (i = 0; i < ndp; i++) {
if (dp[i].d_tag == 0)
break;
switch (dp[i].d_tag) {
case DT_HASH:
ef->hashtab =
(Elf_Hashelt*)(uintptr_t)(dp[i].d_un.d_ptr + off);
break;
case DT_STRTAB:
ef->strtab =
(char *)(uintptr_t)(dp[i].d_un.d_ptr + off);
break;
case DT_STRSZ:
ef->strsz = dp[i].d_un.d_val;
break;
case DT_SYMTAB:
ef->symtab =
(Elf_Sym *)(uintptr_t)(dp[i].d_un.d_ptr + off);
break;
case DT_REL:
ef->rel =
(Elf_Rel *)(uintptr_t)(dp[i].d_un.d_ptr + off);
break;
case DT_RELSZ:
ef->relsz = dp[i].d_un.d_val;
break;
case DT_RELA:
ef->rela =
(Elf_Rela *)(uintptr_t)(dp[i].d_un.d_ptr + off);
break;
case DT_RELASZ:
ef->relasz = dp[i].d_un.d_val;
break;
default:
break;
}
}
if (ef->hashtab == NULL || ef->symtab == NULL ||
ef->strtab == NULL || ef->strsz == 0)
goto out;
COPYOUT(ef->hashtab, &ef->nbuckets, sizeof(ef->nbuckets));
COPYOUT(ef->hashtab + 1, &ef->nchains, sizeof(ef->nchains));
ef->buckets = ef->hashtab + 2;
ef->chains = ef->buckets + ef->nbuckets;
if (__elfN(lookup_symbol)(ef, "__start_set_modmetadata_set", &sym,
STT_NOTYPE) != 0)
return 0;
p_start = sym.st_value + ef->off;
if (__elfN(lookup_symbol)(ef, "__stop_set_modmetadata_set", &sym,
STT_NOTYPE) != 0)
return 0;
p_end = sym.st_value + ef->off;
if (__elfN(parse_modmetadata)(fp, ef, p_start, p_end) == 0)
goto out;
if (ef->kernel) /* kernel must not depend on anything */
goto out;
out:
if (dp)
free(dp);
if (shdr)
free(shdr);
return ret;
}
static char invalid_name[] = "bad";
char *
fake_modname(const char *name)
{
const char *sp, *ep;
char *fp;
size_t len;
sp = strrchr(name, '/');
if (sp)
sp++;
else
sp = name;
ep = strrchr(sp, '.');
if (ep == NULL) {
ep = sp + strlen(sp);
}
if (ep == sp) {
sp = invalid_name;
ep = invalid_name + sizeof(invalid_name) - 1;
}
len = ep - sp;
fp = malloc(len + 1);
if (fp == NULL)
return NULL;
memcpy(fp, sp, len);
fp[len] = '\0';
return fp;
}
#if (defined(__i386__) || defined(__powerpc__)) && __ELF_WORD_SIZE == 64
struct mod_metadata64 {
int md_version; /* structure version MDTV_* */
int md_type; /* type of entry MDT_* */
uint64_t md_data; /* specific data */
uint64_t md_cval; /* common string label */
};
#endif
#if defined(__amd64__) && __ELF_WORD_SIZE == 32
struct mod_metadata32 {
int md_version; /* structure version MDTV_* */
int md_type; /* type of entry MDT_* */
uint32_t md_data; /* specific data */
uint32_t md_cval; /* common string label */
};
#endif
int
__elfN(load_modmetadata)(struct preloaded_file *fp, uint64_t dest)
{
struct elf_file ef;
int err, i, j;
Elf_Shdr *sh_meta, *shdr = NULL;
Elf_Shdr *sh_data[2];
char *shstrtab = NULL;
size_t size;
Elf_Addr p_start, p_end;