int
ELFNAME(os_pt_note)(struct proc *p, struct exec_package *epp, Elf_Ehdr *eh,
char *os_name, size_t name_size, size_t desc_size)
{
Elf_Phdr *hph, *ph;
Elf_Note *np = NULL;
size_t phsize;
int error;
phsize = eh->e_phnum * sizeof(Elf_Phdr);
hph = (Elf_Phdr *)malloc(phsize, M_TEMP, M_WAITOK);
if ((error = ELFNAME(read_from)(p, epp->ep_vp, eh->e_phoff,
(caddr_t)hph, phsize)) != 0)
goto out1;
for (ph = hph; ph < &hph[eh->e_phnum]; ph++) {
if (ph->p_type != PT_NOTE ||
ph->p_filesz > 1024 ||
ph->p_filesz < sizeof(Elf_Note) + name_size)
continue;
np = (Elf_Note *)malloc(ph->p_filesz, M_TEMP, M_WAITOK);
if ((error = ELFNAME(read_from)(p, epp->ep_vp, ph->p_offset,
(caddr_t)np, ph->p_filesz)) != 0)
goto out2;
#if 0
if (np->type != ELF_NOTE_TYPE_OSVERSION) {
free(np, M_TEMP);
np = NULL;
continue;
}
#endif
/* Check the name and description sizes. */
if (np->namesz != name_size ||
np->descsz != desc_size)
goto out3;
if (bcmp((np + 1), os_name, name_size))
goto out3;
/* XXX: We could check for the specific emulation here */
/* All checks succeeded. */
error = 0;
goto out2;
}
out3:
error = ENOEXEC;
out2:
if (np)
free(np, M_TEMP);
out1:
free(hph, M_TEMP);
return error;
}
int
ELFNAME(find_rd_root_image)(char *file, int fd, Elf_Phdr *ph, int segment,
long *prd_root_size_off, long *prd_root_image_off, off_t *pmmap_off,
size_t *pmmap_size)
{
unsigned long kernel_start, kernel_size;
uint64_t rd_root_size_off, rd_root_image_off;
if (ELFNAME(nlist)(fd, ELFNAME(wantsyms))) {
fprintf(stderr, "%s: no rd_root_image symbols?\n", file);
exit(1);
}
kernel_start = ph->p_paddr;
kernel_size = ph->p_filesz;
rd_root_size_off = ELFNAME(wantsyms)[0].n_value - kernel_start;
rd_root_size_off -= (ph->p_vaddr - ph->p_paddr);
rd_root_image_off = ELFNAME(wantsyms)[1].n_value - kernel_start;
rd_root_image_off -= (ph->p_vaddr - ph->p_paddr);
if (debug) {
fprintf(stderr, "segment %d rd_root_size_off = 0x%x\n", segment,
rd_root_size_off);
if ((ph->p_vaddr - ph->p_paddr) != 0)
fprintf(stderr, "root_off v %x p %x, diff %x altered %x\n",
ph->p_vaddr, ph->p_paddr,
(ph->p_vaddr - ph->p_paddr),
rd_root_size_off - (ph->p_vaddr - ph->p_paddr));
fprintf(stderr, "rd_root_image_off = 0x%x\n", rd_root_image_off);
}
/*
* Sanity check locations of db_* symbols
*/
if (rd_root_image_off < 0 || rd_root_image_off >= kernel_size)
return (0);
if (rd_root_size_off < 0 || rd_root_size_off >= kernel_size) {
fprintf(stderr, "%s: rd_root_size not in data segment?\n",
file);
return (0);
}
*pmmap_off = ph->p_offset;
*pmmap_size = kernel_size;
*prd_root_size_off = rd_root_size_off;
*prd_root_image_off = rd_root_image_off;
return (1);
}
/*
* Check header for validity; return 0 for ok, ENOEXEC if error.
* Remember OS tag for callers sake.
*/
int
ELFNAME(olf_check_header)(Elf_Ehdr *ehdr, int type, u_int8_t *os)
{
int i;
/*
* We need to check magic, class size, endianess, version, and OS
* before we look at the rest of the Elf_Ehdr structure. These few
* elements are represented in a machine independant fashion.
*/
if (!IS_OLF(*ehdr) ||
ehdr->e_ident[OI_CLASS] != ELF_TARG_CLASS ||
ehdr->e_ident[OI_DATA] != ELF_TARG_DATA ||
ehdr->e_ident[OI_VERSION] != ELF_TARG_VER)
return (ENOEXEC);
for (i = 0;
i < sizeof(ELFNAME(probes)) / sizeof(ELFNAME(probes)[0]);
i++) {
if ((1 << ehdr->e_ident[OI_OS]) & ELFNAME(probes)[i].os_mask)
goto os_ok;
}
return (ENOEXEC);
os_ok:
/* Now check the machine dependant header */
if (ehdr->e_machine != ELF_TARG_MACH ||
ehdr->e_version != ELF_TARG_VER)
return (ENOEXEC);
/* Check the type */
if (ehdr->e_type != type)
return (ENOEXEC);
/* Don't allow an insane amount of sections. */
if (ehdr->e_phnum > ELF_MAX_VALID_PHDR)
return (ENOEXEC);
*os = ehdr->e_ident[OI_OS];
return (0);
}
int
linux_elf_probe(struct proc *p, struct exec_package *epp, char *itp,
u_long *pos, u_int8_t *os)
{
Elf32_Ehdr *eh = epp->ep_hdr;
char *bp, *brand;
int error;
size_t len;
if (!(emul_linux_elf.e_flags & EMUL_ENABLED))
return (ENOEXEC);
/*
* Modern Linux binaries carry an identification note.
*/
if (ELFNAME(os_pt_note)(p, epp, epp->ep_hdr, "GNU", 4, 0x10) == 0) {
goto recognized;
}
brand = elf32_check_brand(eh);
if (brand != NULL && strcmp(brand, "Linux") != 0)
return (EINVAL);
/*
* If this is a static binary, do not allow it to run, as it
* has not been identified. We'll give non-static binaries a
* chance to run, as the Linux ld.so name is usually unique
* enough to clear any amibiguity.
*/
if (itp == NULL)
return (EINVAL);
recognized:
if (itp) {
if ((error = emul_find(p, NULL, linux_emul_path, itp, &bp, 0)))
return (error);
if ((error = copystr(bp, itp, MAXPATHLEN, &len)))
return (error);
free(bp, M_TEMP);
}
epp->ep_emul = &emul_linux_elf;
*pos = ELF32_NO_ADDR;
if (*os == OOS_NULL)
*os = OOS_LINUX;
mtx_init(&futex_lock, IPL_NONE);
futex_pool_init();
return (0);
}
void *
ELFNAME(locate_image)(int fd, struct elfhdr *ghead, char *file,
long *prd_root_size_off, long *prd_root_image_off, off_t *pmmap_off,
size_t *pmmap_size)
{
int n;
int found = 0;
size_t phsize;
Elf_Ehdr head;
Elf_Phdr *ph;
/* elfhdr may not have the full header? */
lseek(fd, 0, SEEK_SET);
if (read(fd, &head, sizeof(head)) != sizeof(head)) {
fprintf(stderr, "%s: can't read phdr area\n", file);
exit(1);
}
phsize = head.e_phnum * sizeof(Elf_Phdr);
ph = malloc(phsize);
lseek(fd, head.e_phoff, SEEK_SET);
if (read(fd, ph, phsize) != phsize) {
fprintf(stderr, "%s: can't read phdr area\n", file);
exit(1);
}
for (n = 0; n < head.e_phnum && !found; n++) {
if (ph[n].p_type == PT_LOAD)
found = ELFNAME(find_rd_root_image)(file, fd, &ph[n],
n, prd_root_size_off, prd_root_image_off,
pmmap_off, pmmap_size);
}
if (!found) {
fprintf(stderr, "%s: can't locate space for rd_root_image!\n",
file);
exit(1);
}
free(ph);
}
extern char linux_sigcode[], linux_esigcode[];
extern struct sysent linux_sysent[];
extern char *linux_syscallnames[];
struct emul ELFNAMEEND(emul_linux) = {
"linux",
native_to_linux_errno,
linux_sendsig,
LINUX_SYS_syscall,
LINUX_SYS_MAXSYSCALL,
linux_sysent,
linux_syscallnames,
LINUX_ELF_AUX_ARGSIZ,
ELFNAME(copyargs),
linux_setregs,
linux_sigcode,
linux_esigcode,
};
#ifdef LINUX_GCC_SIGNATURE
/*
* Take advantage of the fact that all the linux binaries are compiled
* with gcc, and gcc sticks in the comment field a signature. Note that
* on SVR4 binaries, the gcc signature will follow the OS name signature,
* that will not be a problem. We don't bother to read in the string table,
* but we check all the progbits headers.
*
* XXX This only works in the i386. On the alpha (at least)
/*
* Phase II of load. It is now safe to load the interpreter. Info collected
* when loading the program is available for setup of the interpreter.
*/
int
ELFNAME2(exec,fixup)(struct proc *p, struct exec_package *epp)
{
char *interp;
int error;
struct elf_args *ap;
AuxInfo ai[ELF_AUX_ENTRIES], *a;
Elf_Addr pos = epp->ep_interp_pos;
if (epp->ep_interp == NULL) {
return (0);
}
interp = (char *)epp->ep_interp;
ap = (struct elf_args *)epp->ep_emul_arg;
if ((error = ELFNAME(load_file)(p, interp, epp, ap, &pos)) != 0) {
free((char *)ap, M_TEMP);
free((char *)interp, M_TEMP);
kill_vmcmds(&epp->ep_vmcmds);
return (error);
}
/*
* We have to do this ourselves...
*/
error = exec_process_vmcmds(p, epp);
/*
* Push extra arguments on the stack needed by dynamically
* linked binaries
*/
if (error == 0) {
a = ai;
a->au_id = AUX_phdr;
a->au_v = ap->arg_phaddr;
a++;
a->au_id = AUX_phent;
a->au_v = ap->arg_phentsize;
a++;
a->au_id = AUX_phnum;
a->au_v = ap->arg_phnum;
a++;
a->au_id = AUX_pagesz;
a->au_v = PAGE_SIZE;
a++;
a->au_id = AUX_base;
a->au_v = ap->arg_interp;
a++;
a->au_id = AUX_flags;
a->au_v = 0;
a++;
a->au_id = AUX_entry;
a->au_v = ap->arg_entry;
a++;
a->au_id = AUX_null;
a->au_v = 0;
a++;
error = copyout(ai, epp->ep_emul_argp, sizeof ai);
}
free((char *)ap, M_TEMP);
free((char *)interp, M_TEMP);
return (error);
}
/*
* Prepare an Elf binary's exec package
*
* First, set of the various offsets/lengths in the exec package.
*
* Then, mark the text image busy (so it can be demand paged) or error out if
* this is not possible. Finally, set up vmcmds for the text, data, bss, and
* stack segments.
*/
int
ELFNAME2(exec,makecmds)(struct proc *p, struct exec_package *epp)
{
Elf_Ehdr *eh = epp->ep_hdr;
Elf_Phdr *ph, *pp;
Elf_Addr phdr = 0;
int error, i;
char interp[MAXPATHLEN];
u_long pos = 0, phsize;
u_int8_t os = OOS_NULL;
if (epp->ep_hdrvalid < sizeof(Elf_Ehdr))
return (ENOEXEC);
if (ELFNAME(check_header)(eh, ET_EXEC) &&
ELFNAME(olf_check_header)(eh, ET_EXEC, &os))
return (ENOEXEC);
/*
* check if vnode is in open for writing, because we want to demand-
* page out of it. if it is, don't do it, for various reasons.
*/
if (epp->ep_vp->v_writecount != 0) {
#ifdef DIAGNOSTIC
if (epp->ep_vp->v_flag & VTEXT)
panic("exec: a VTEXT vnode has writecount != 0");
#endif
return (ETXTBSY);
}
/*
* Allocate space to hold all the program headers, and read them
* from the file
*/
phsize = eh->e_phnum * sizeof(Elf_Phdr);
ph = (Elf_Phdr *)malloc(phsize, M_TEMP, M_WAITOK);
if ((error = ELFNAME(read_from)(p, epp->ep_vp, eh->e_phoff, (caddr_t)ph,
phsize)) != 0)
goto bad;
epp->ep_tsize = ELFDEFNNAME(NO_ADDR);
epp->ep_dsize = ELFDEFNNAME(NO_ADDR);
interp[0] = '\0';
for (i = 0; i < eh->e_phnum; i++) {
pp = &ph[i];
if (pp->p_type == PT_INTERP) {
if (pp->p_filesz >= sizeof(interp))
goto bad;
if ((error = ELFNAME(read_from)(p, epp->ep_vp,
pp->p_offset, (caddr_t)interp, pp->p_filesz)) != 0)
goto bad;
break;
}
}
/*
* OK, we want a slightly different twist of the
* standard emulation package for "real" elf.
*/
epp->ep_emul = &ELFNAMEEND(emul);
pos = ELFDEFNNAME(NO_ADDR);
/*
* On the same architecture, we may be emulating different systems.
* See which one will accept this executable.
*
* Probe functions would normally see if the interpreter (if any)
* exists. Emulation packages may possibly replace the interpreter in
* interp[] with a changed path (/emul/xxx/<path>), and also
* set the ep_emul field in the exec package structure.
*/
error = ENOEXEC;
p->p_os = OOS_OPENBSD;
#ifdef NATIVE_EXEC_ELF
if (ELFNAME(os_pt_note)(p, epp, epp->ep_hdr, "OpenBSD", 8, 4) == 0) {
goto native;
}
#endif
for (i = 0;
i < sizeof(ELFNAME(probes)) / sizeof(ELFNAME(probes)[0]) && error;
i++) {
if (os == OOS_NULL || ((1 << os) & ELFNAME(probes)[i].os_mask))
error = ELFNAME(probes)[i].func ?
(*ELFNAME(probes)[i].func)(p, epp, interp, &pos, &os) :
0;
}
if (!error)
p->p_os = os;
#ifndef NATIVE_EXEC_ELF
else
goto bad;
#else
native:
#endif /* NATIVE_EXEC_ELF */
/*
* Load all the necessary sections
*/
for (i = 0; i < eh->e_phnum; i++) {
Elf_Addr addr = ELFDEFNNAME(NO_ADDR), size = 0;
int prot = 0;
pp = &ph[i];
switch (ph[i].p_type) {
case PT_LOAD:
/*
* Calcuates size of text and data segments
* by starting at first and going to end of last.
* 'rwx' sections are treated as data.
* this is correct for BSS_PLT, but may not be
* for DATA_PLT, is fine for TEXT_PLT.
*/
ELFNAME(load_psection)(&epp->ep_vmcmds, epp->ep_vp,
&ph[i], &addr, &size, &prot, 0);
/*
* Decide whether it's text or data by looking
* at the protection of the section
*/
if (prot & VM_PROT_WRITE) {
/* data section */
if (epp->ep_dsize == ELFDEFNNAME(NO_ADDR)) {
epp->ep_daddr = addr;
epp->ep_dsize = size;
} else {
if (addr < epp->ep_daddr) {
epp->ep_dsize =
epp->ep_dsize +
epp->ep_daddr -
addr;
epp->ep_daddr = addr;
} else
epp->ep_dsize = addr+size -
epp->ep_daddr;
}
} else if (prot & VM_PROT_EXECUTE) {
/* text section */
if (epp->ep_tsize == ELFDEFNNAME(NO_ADDR)) {
epp->ep_taddr = addr;
epp->ep_tsize = size;
} else {
if (addr < epp->ep_taddr) {
epp->ep_tsize =
epp->ep_tsize +
epp->ep_taddr -
addr;
epp->ep_taddr = addr;
} else
epp->ep_tsize = addr+size -
epp->ep_taddr;
}
}
break;
case PT_SHLIB:
error = ENOEXEC;
goto bad;
case PT_INTERP:
/* Already did this one */
case PT_DYNAMIC:
case PT_NOTE:
break;
case PT_PHDR:
/* Note address of program headers (in text segment) */
phdr = pp->p_vaddr;
break;
default:
/*
* Not fatal, we don't need to understand everything
* :-)
*/
break;
}
}
/*
* Check if we found a dynamically linked binary and arrange to load
* it's interpreter when the exec file is released.
*/
if (interp[0]) {
char *ip;
struct elf_args *ap;
ip = (char *)malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
ap = (struct elf_args *)
malloc(sizeof(struct elf_args), M_TEMP, M_WAITOK);
bcopy(interp, ip, MAXPATHLEN);
epp->ep_interp = ip;
epp->ep_interp_pos = pos;
ap->arg_phaddr = phdr;
ap->arg_phentsize = eh->e_phentsize;
ap->arg_phnum = eh->e_phnum;
ap->arg_entry = eh->e_entry;
ap->arg_os = os;
epp->ep_emul_arg = ap;
epp->ep_entry = eh->e_entry; /* keep check_exec() happy */
} else {
epp->ep_interp = NULL;
epp->ep_entry = eh->e_entry;
}
#if defined(COMPAT_SVR4) && defined(i386)
#ifndef ELF_MAP_PAGE_ZERO
/* Dell SVR4 maps page zero, yeuch! */
if (p->p_os == OOS_DELL)
#endif
NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, PAGE_SIZE, 0,
epp->ep_vp, 0, VM_PROT_READ);
#endif
free((char *)ph, M_TEMP);
vn_marktext(epp->ep_vp);
return (exec_setup_stack(p, epp));
bad:
free((char *)ph, M_TEMP);
kill_vmcmds(&epp->ep_vmcmds);
return (ENOEXEC);
}
/*
* Load a file (interpreter/library) pointed to by path [stolen from
* coff_load_shlib()]. Made slightly generic so it might be used externally.
*/
int
ELFNAME(load_file)(struct proc *p, char *path, struct exec_package *epp,
struct elf_args *ap, Elf_Addr *last)
{
int error, i;
struct nameidata nd;
Elf_Ehdr eh;
Elf_Phdr *ph = NULL;
u_long phsize;
char *bp = NULL;
Elf_Addr addr;
struct vnode *vp;
u_int8_t os; /* Just a dummy in this routine */
Elf_Phdr *base_ph = NULL;
struct interp_ld_sec {
Elf_Addr vaddr;
u_long memsz;
} loadmap[ELF_MAX_VALID_PHDR];
int nload, idx = 0;
Elf_Addr pos = *last;
int file_align;
bp = path;
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, path, p);
if ((error = namei(&nd)) != 0) {
return (error);
}
vp = nd.ni_vp;
if (vp->v_type != VREG) {
error = EACCES;
goto bad;
}
if ((error = VOP_GETATTR(vp, epp->ep_vap, p->p_ucred, p)) != 0)
goto bad;
if (vp->v_mount->mnt_flag & MNT_NOEXEC) {
error = EACCES;
goto bad;
}
if ((error = VOP_ACCESS(vp, VREAD, p->p_ucred, p)) != 0)
goto bad1;
if ((error = ELFNAME(read_from)(p, nd.ni_vp, 0,
(caddr_t)&eh, sizeof(eh))) != 0)
goto bad1;
if (ELFNAME(check_header)(&eh, ET_DYN) &&
ELFNAME(olf_check_header)(&eh, ET_DYN, &os)) {
error = ENOEXEC;
goto bad1;
}
phsize = eh.e_phnum * sizeof(Elf_Phdr);
ph = (Elf_Phdr *)malloc(phsize, M_TEMP, M_WAITOK);
if ((error = ELFNAME(read_from)(p, nd.ni_vp, eh.e_phoff, (caddr_t)ph,
phsize)) != 0)
goto bad1;
for (i = 0; i < eh.e_phnum; i++) {
if (ph[i].p_type == PT_LOAD) {
loadmap[idx].vaddr = trunc_page(ph[i].p_vaddr);
loadmap[idx].memsz = round_page (ph[i].p_vaddr +
ph[i].p_memsz - loadmap[idx].vaddr);
file_align = ph[i].p_align;
idx++;
}
}
nload = idx;
/*
* If no position to load the interpreter was set by a probe
* function, pick the same address that a non-fixed mmap(0, ..)
* would (i.e. something safely out of the way).
*/
if (pos == ELFDEFNNAME(NO_ADDR)) {
pos = uvm_map_hint(p, VM_PROT_EXECUTE);
}
pos = ELF_ROUND(pos, file_align);
*last = epp->ep_interp_pos = pos;
for (i = 0; i < nload;/**/) {
vaddr_t addr;
struct uvm_object *uobj;
off_t uoff;
size_t size;
#ifdef this_needs_fixing
if (i == 0) {
uobj = &vp->v_uvm.u_obj;
/* need to fix uoff */
} else {
#endif
uobj = NULL;
uoff = 0;
#ifdef this_needs_fixing
}
#endif
addr = trunc_page(pos + loadmap[i].vaddr);
size = round_page(addr + loadmap[i].memsz) - addr;
/* CRAP - map_findspace does not avoid daddr+MAXDSIZ */
if ((addr + size > (vaddr_t)p->p_vmspace->vm_daddr) &&
(addr < (vaddr_t)p->p_vmspace->vm_daddr + MAXDSIZ))
addr = round_page((vaddr_t)p->p_vmspace->vm_daddr +
MAXDSIZ);
if (uvm_map_findspace(&p->p_vmspace->vm_map, addr, size,
&addr, uobj, uoff, 0, UVM_FLAG_FIXED) == NULL) {
if (uvm_map_findspace(&p->p_vmspace->vm_map, addr, size,
&addr, uobj, uoff, 0, 0) == NULL) {
error = ENOMEM; /* XXX */
goto bad1;
}
}
if (addr != pos + loadmap[i].vaddr) {
/* base changed. */
pos = addr - trunc_page(loadmap[i].vaddr);
pos = ELF_ROUND(pos,file_align);
epp->ep_interp_pos = *last = pos;
i = 0;
continue;
}
i++;
}
/*
* Load all the necessary sections
*/
for (i = 0; i < eh.e_phnum; i++) {
Elf_Addr size = 0;
int prot = 0;
int flags;
switch (ph[i].p_type) {
case PT_LOAD:
if (base_ph == NULL) {
flags = VMCMD_BASE;
addr = *last;
base_ph = &ph[i];
} else {
flags = VMCMD_RELATIVE;
addr = ph[i].p_vaddr - base_ph->p_vaddr;
}
ELFNAME(load_psection)(&epp->ep_vmcmds, nd.ni_vp,
&ph[i], &addr, &size, &prot, flags);
/* If entry is within this section it must be text */
if (eh.e_entry >= ph[i].p_vaddr &&
eh.e_entry < (ph[i].p_vaddr + size)) {
epp->ep_entry = addr + eh.e_entry -
ELF_TRUNC(ph[i].p_vaddr,ph[i].p_align);
ap->arg_interp = addr;
}
addr += size;
break;
case PT_DYNAMIC:
case PT_PHDR:
case PT_NOTE:
break;
default:
break;
}
}
vn_marktext(nd.ni_vp);
bad1:
VOP_CLOSE(nd.ni_vp, FREAD, p->p_ucred, p);
bad:
if (ph != NULL)
free((char *)ph, M_TEMP);
*last = addr;
vput(nd.ni_vp);
return (error);
}
int
ELFNAME(nlist)(int fd, struct nlist *list)
{
struct nlist *p;
caddr_t strtab;
Elf_Off symoff = 0, symstroff = 0;
Elf_Word symsize = 0;
long symstrsize = 0;
Elf_Sword nent, cc, i;
Elf_Sym sbuf[1024];
Elf_Sym *s;
Elf_Ehdr ehdr;
Elf_Shdr *shdr = NULL;
size_t shdr_size;
struct stat st;
int usemalloc = 0;
size_t left, len;
/* Make sure obj is OK */
if (pread(fd, &ehdr, sizeof(Elf_Ehdr), (off_t)0) != sizeof(Elf_Ehdr) ||
!ELFNAME(__elf_is_okay__)(&ehdr) || fstat(fd, &st) < 0)
return (-1);
/* calculate section header table size */
shdr_size = ehdr.e_shentsize * ehdr.e_shnum;
/* Make sure it's not too big to mmap */
if (SIZE_MAX - ehdr.e_shoff < shdr_size ||
S_ISREG(st.st_mode) && ehdr.e_shoff + shdr_size > st.st_size) {
errno = EFBIG;
return (-1);
}
/* mmap section header table */
shdr = (Elf_Shdr *)mmap(NULL, (size_t)shdr_size, PROT_READ,
MAP_SHARED|MAP_FILE, fd, (off_t) ehdr.e_shoff);
if (shdr == MAP_FAILED) {
usemalloc = 1;
if ((shdr = malloc(shdr_size)) == NULL)
return (-1);
if (pread(fd, shdr, shdr_size, (off_t)ehdr.e_shoff) !=
shdr_size) {
free(shdr);
return (-1);
}
}
/*
* Find the symbol table entry and its corresponding
* string table entry. Version 1.1 of the ABI states
* that there is only one symbol table but that this
* could change in the future.
*/
for (i = 0; i < ehdr.e_shnum; i++) {
if (shdr[i].sh_type == SHT_SYMTAB) {
if (shdr[i].sh_link >= ehdr.e_shnum)
continue;
symoff = shdr[i].sh_offset;
symsize = shdr[i].sh_size;
symstroff = shdr[shdr[i].sh_link].sh_offset;
symstrsize = shdr[shdr[i].sh_link].sh_size;
break;
}
}
/* Flush the section header table */
if (usemalloc)
free(shdr);
else
munmap((caddr_t)shdr, shdr_size);
/*
* clean out any left-over information for all valid entries.
* Type and value defined to be 0 if not found; historical
* versions cleared other and desc as well. Also figure out
* the largest string length so don't read any more of the
* string table than we have to.
*
* XXX clearing anything other than n_type and n_value violates
* the semantics given in the man page.
*/
nent = 0;
for (p = list; !ISLAST(p); ++p) {
p->n_type = 0;
p->n_other = 0;
p->n_desc = 0;
p->n_value = 0;
++nent;
}
/* Don't process any further if object is stripped. */
/* ELFism - dunno if stripped by looking at header */
if (symoff == 0)
return nent;
/* Check for files too large to mmap. */
if (SIZE_MAX - symstrsize < symstroff ||
S_ISREG(st.st_mode) && symstrsize + symstroff > st.st_size) {
errno = EFBIG;
return (-1);
}
/*
* Map string table into our address space. This gives us
* an easy way to randomly access all the strings, without
* making the memory allocation permanent as with malloc/free
* (i.e., munmap will return it to the system).
*/
if (usemalloc) {
if ((strtab = malloc(symstrsize)) == NULL)
return (-1);
if (pread(fd, strtab, symstrsize, (off_t)symstroff) !=
symstrsize) {
free(strtab);
return (-1);
}
} else {
strtab = mmap(NULL, (size_t)symstrsize, PROT_READ,
MAP_SHARED|MAP_FILE, fd, (off_t) symstroff);
if (strtab == MAP_FAILED)
return (-1);
}
while (symsize >= sizeof(Elf_Sym)) {
cc = MIN(symsize, sizeof(sbuf));
if (pread(fd, sbuf, cc, (off_t)symoff) != cc)
break;
symsize -= cc;
symoff += cc;
for (s = sbuf; cc > 0; ++s, cc -= sizeof(*s)) {
Elf_Word soff = s->st_name;
if (soff == 0 || soff >= symstrsize)
continue;
left = symstrsize - soff;
for (p = list; !ISLAST(p); p++) {
char *sym;
/*
* First we check for the symbol as it was
* provided by the user. If that fails
* and the first char is an '_', skip over
* the '_' and try again.
* XXX - What do we do when the user really
* wants '_foo' and there are symbols
* for both 'foo' and '_foo' in the
* table and 'foo' is first?
*/
sym = p->n_name;
len = strlen(sym);
if ((len >= left ||
strcmp(&strtab[soff], sym) != 0) &&
(sym[0] != '_' || len - 1 >= left ||
strcmp(&strtab[soff], sym + 1) != 0))
continue;
p->n_value = s->st_value;
/* XXX - type conversion */
/* is pretty rude. */
switch(ELF_ST_TYPE(s->st_info)) {
case STT_NOTYPE:
switch (s->st_shndx) {
case SHN_UNDEF:
p->n_type = N_UNDF;
break;
case SHN_ABS:
p->n_type = N_ABS;
break;
case SHN_COMMON:
p->n_type = N_COMM;
break;
default:
p->n_type = N_COMM | N_EXT;
break;
}
break;
case STT_OBJECT:
p->n_type = N_DATA;
break;
case STT_FUNC:
p->n_type = N_TEXT;
break;
case STT_FILE:
p->n_type = N_FN;
break;
}
if (ELF_ST_BIND(s->st_info) == STB_LOCAL)
p->n_type = N_EXT;
p->n_desc = 0;
p->n_other = 0;
if (--nent <= 0)
break;
}
}
}
elf_done:
if (usemalloc)
free(strtab);
else
munmap(strtab, symstrsize);
return (nent);
}
#include <limits.h>
#include <sys/exec_elf.h>
#include "elfrdsetroot.h"
void *
ELFNAME(locate_image)(int, struct elfhdr *, char *, long *, long *, off_t *,
size_t *);
int
ELFNAME(find_rd_root_image)(char *, int, Elf_Phdr *, int, long *, long *,
off_t *, size_t *);
struct elf_fn ELFDEFNNAME(fn) =
{
ELFNAME(locate_image),
ELFNAME(find_rd_root_image)
};
void *
ELFNAME(locate_image)(int fd, struct elfhdr *ghead, char *file,
long *prd_root_size_off, long *prd_root_image_off, off_t *pmmap_off,
size_t *pmmap_size)
{
int n;
int found = 0;
size_t phsize;
Elf_Ehdr head;
Elf_Phdr *ph;
