/*
* Look for a .gnu_debuglink, specific to x86_64 interpeter
*/
int
ELFNAME2(linux,debuglink_signature)(struct lwp *l, struct exec_package *epp, Elf_Ehdr *eh)
{
size_t shsize;
int strndx;
size_t i;
static const char signature[] = ".gnu_debuglink";
char *strtable = NULL;
Elf_Shdr *sh;
int error;
/*
* load the section header table
*/
shsize = eh->e_shnum * sizeof(Elf_Shdr);
sh = (Elf_Shdr *) malloc(shsize, M_TEMP, M_WAITOK);
error = exec_read_from(l, epp->ep_vp, eh->e_shoff, sh, shsize);
if (error)
goto out;
/*
* Now let's find the string table. If it does not exists, give up.
*/
strndx = (int)(eh->e_shstrndx);
if (strndx == SHN_UNDEF) {
error = ENOEXEC;
goto out;
}
/*
* strndx is the index in section header table of the string table
* section get the whole string table in strtable, and then we get access to the names
* s->sh_name is the offset of the section name in strtable.
*/
strtable = malloc(sh[strndx].sh_size, M_TEMP, M_WAITOK);
error = exec_read_from(l, epp->ep_vp, sh[strndx].sh_offset, strtable,
sh[strndx].sh_size);
if (error)
goto out;
for (i = 0; i < eh->e_shnum; i++) {
Elf_Shdr *s = &sh[i];
if (!memcmp((void*)(&(strtable[s->sh_name])), signature,
sizeof(signature))) {
DPRINTF(("linux_debuglink_sig=%s\n",
&(strtable[s->sh_name])));
error = 0;
goto out;
}
}
error = ENOEXEC;
out:
free(sh, M_TEMP);
if (strtable)
free(strtable, M_TEMP);
return (error);
}
/*
* 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)
* XXX we have the same gcc signature which incorrectly identifies
* XXX NetBSD binaries as Linux.
*/
int
ELFNAME2(linux,gcc_signature)(
struct lwp *l,
struct exec_package *epp,
Elf_Ehdr *eh)
{
size_t shsize;
size_t i;
static const char signature[] = "\0GCC: (GNU) ";
char tbuf[sizeof(signature) - 1];
Elf_Shdr *sh;
int error;
shsize = eh->e_shnum * sizeof(Elf_Shdr);
sh = (Elf_Shdr *) malloc(shsize, M_TEMP, M_WAITOK);
error = exec_read_from(l, epp->ep_vp, eh->e_shoff, sh, shsize);
if (error)
goto out;
for (i = 0; i < eh->e_shnum; i++) {
Elf_Shdr *s = &sh[i];
/*
* Identify candidates for the comment header;
* Header cannot have a load address, or flags and
* it must be large enough.
*/
if (s->sh_type != SHT_PROGBITS ||
s->sh_addr != 0 ||
s->sh_flags != 0 ||
s->sh_size < sizeof(signature) - 1)
continue;
error = exec_read_from(l, epp->ep_vp, s->sh_offset, tbuf,
sizeof(signature) - 1);
if (error)
continue;
/*
* error is 0, if the signatures match we are done.
*/
DPRINTF(("linux_gcc_sig: sig=%s\n", tbuf));
if (!memcmp(tbuf, signature, sizeof(signature) - 1)) {
error = 0;
goto out;
}
}
error = ENOEXEC;
out:
free(sh, M_TEMP);
return (error);
}
/*
* Check PE signature.
*/
int
pecoff_signature(struct lwp *l, struct vnode *vp, struct pecoff_dos_filehdr *dp)
{
int error;
char tbuf[sizeof(signature) - 1];
if (DOS_BADMAG(dp)) {
return ENOEXEC;
}
error = exec_read_from(l, vp, dp->d_peofs, tbuf, sizeof(tbuf));
if (error) {
return error;
}
if (memcmp(tbuf, signature, sizeof(signature) - 1) == 0) {
return 0;
}
return EFTYPE;
}
int
exec_pecoff_makecmds(struct lwp *l, struct exec_package *epp)
{
int error, peofs;
struct pecoff_dos_filehdr *dp = epp->ep_hdr;
struct coff_filehdr *fp;
struct proc *p;
p = l->l_proc;
/*
* mmap EXE file (PE format)
* 1. read header (DOS,PE)
* 2. mmap code section (READ|EXEC)
* 3. mmap other section, such as data (READ|WRITE|EXEC)
*/
if (epp->ep_hdrvalid < PECOFF_DOS_HDR_SIZE) {
return ENOEXEC;
}
if ((error = pecoff_signature(l, epp->ep_vp, dp)) != 0)
return error;
if ((error = vn_marktext(epp->ep_vp)) != 0)
return error;
peofs = dp->d_peofs + sizeof(signature) - 1;
fp = malloc(PECOFF_HDR_SIZE, M_TEMP, M_WAITOK);
error = exec_read_from(l, epp->ep_vp, peofs, fp, PECOFF_HDR_SIZE);
if (error) {
free(fp, M_TEMP);
return error;
}
error = exec_pecoff_coff_makecmds(l, epp, fp, peofs);
if (error != 0)
kill_vmcmds(&epp->ep_vmcmds);
free(fp, M_TEMP);
return error;
}
int
ELFNAME2(linux,copyargs)(struct lwp *l, struct exec_package *pack,
struct ps_strings *arginfo, char **stackp, void *argp)
{
struct linux_extra_stack_data64 *esdp, esd;
struct elf_args *ap;
struct vattr *vap;
Elf_Ehdr *eh;
Elf_Phdr *ph;
u_long phsize;
Elf_Addr phdr = 0;
int error;
int i;
if ((error = copyargs(l, pack, arginfo, stackp, argp)) != 0)
return error;
/*
* Push extra arguments on the stack needed by dynamically
* linked binaries and static binaries as well.
*/
memset(&esd, 0, sizeof(esd));
esdp = (struct linux_extra_stack_data64 *)(*stackp);
ap = (struct elf_args *)pack->ep_emul_arg;
vap = pack->ep_vap;
eh = (Elf_Ehdr *)pack->ep_hdr;
/*
* We forgot this, so we need to reload it now. XXX keep track of it?
*/
if (ap == NULL) {
phsize = eh->e_phnum * sizeof(Elf_Phdr);
ph = (Elf_Phdr *)kmem_alloc(phsize, KM_SLEEP);
error = exec_read_from(l, pack->ep_vp, eh->e_phoff, ph, phsize);
if (error != 0) {
for (i = 0; i < eh->e_phnum; i++) {
if (ph[i].p_type == PT_PHDR) {
phdr = ph[i].p_vaddr;
break;
}
}
}
kmem_free(ph, phsize);
}
/*
* The exec_package doesn't have a proc pointer and it's not
* exactly trivial to add one since the credentials are
* changing. XXX Linux uses curlwp's credentials.
* Why can't we use them too?
*/
i = 0;
esd.ai[i].a_type = LINUX_AT_HWCAP;
esd.ai[i++].a_v = rcr4();
esd.ai[i].a_type = AT_PAGESZ;
esd.ai[i++].a_v = PAGE_SIZE;
esd.ai[i].a_type = LINUX_AT_CLKTCK;
esd.ai[i++].a_v = hz;
esd.ai[i].a_type = AT_PHDR;
esd.ai[i++].a_v = (ap ? ap->arg_phaddr: phdr);
esd.ai[i].a_type = AT_PHENT;
esd.ai[i++].a_v = (ap ? ap->arg_phentsize : eh->e_phentsize);
esd.ai[i].a_type = AT_PHNUM;
esd.ai[i++].a_v = (ap ? ap->arg_phnum : eh->e_phnum);
esd.ai[i].a_type = AT_BASE;
esd.ai[i++].a_v = (ap ? ap->arg_interp : 0);
esd.ai[i].a_type = AT_FLAGS;
esd.ai[i++].a_v = 0;
esd.ai[i].a_type = AT_ENTRY;
esd.ai[i++].a_v = (ap ? ap->arg_entry : eh->e_entry);
esd.ai[i].a_type = LINUX_AT_EGID;
esd.ai[i++].a_v = ((vap->va_mode & S_ISGID) ?
vap->va_gid : kauth_cred_getegid(l->l_cred));
esd.ai[i].a_type = LINUX_AT_GID;
esd.ai[i++].a_v = kauth_cred_getgid(l->l_cred);
esd.ai[i].a_type = LINUX_AT_EUID;
esd.ai[i++].a_v = ((vap->va_mode & S_ISUID) ?
vap->va_uid : kauth_cred_geteuid(l->l_cred));
esd.ai[i].a_type = LINUX_AT_UID;
esd.ai[i++].a_v = kauth_cred_getuid(l->l_cred);
esd.ai[i].a_type = LINUX_AT_SECURE;
esd.ai[i++].a_v = 0;
esd.ai[i].a_type = LINUX_AT_PLATFORM;
esd.ai[i++].a_v = (Elf_Addr)&esdp->hw_platform[0];
esd.ai[i].a_type = AT_NULL;
esd.ai[i++].a_v = 0;
#ifdef DEBUG_LINUX
if (i != LINUX_ELF_AUX_ENTRIES) {
printf("linux_elf64_copyargs: %d Aux entries\n", i);
return EINVAL;
}
#endif
strcpy(esd.hw_platform, LINUX_PLATFORM);
exec_free_emul_arg(pack);
/*
* Copy out the ELF auxiliary table and hw platform name
*/
if ((error = copyout(&esd, esdp, sizeof(esd))) != 0)
return error;
*stackp += sizeof(esd);
return 0;
}
int
exec_pecoff_prep_zmagic(struct lwp *l, struct exec_package *epp, struct coff_filehdr *fp, struct coff_aouthdr *ap, int peofs)
{
int error, i;
struct pecoff_opthdr *wp;
long daddr, baddr, bsize;
u_long tsize, dsize;
struct coff_scnhdr *sh;
struct pecoff_args *argp;
int scnsiz = sizeof(struct coff_scnhdr) * fp->f_nscns;
wp = (void *)((char *)ap + sizeof(struct coff_aouthdr));
epp->ep_tsize = ap->a_tsize;
epp->ep_daddr = VM_MAXUSER_ADDRESS;
epp->ep_dsize = 0;
/* read section header */
sh = malloc(scnsiz, M_TEMP, M_WAITOK);
error = exec_read_from(l, epp->ep_vp, peofs + PECOFF_HDR_SIZE, sh,
scnsiz);
if (error) {
free(sh, M_TEMP);
return error;
}
/*
* map section
*/
for (i = 0; i < fp->f_nscns; i++) {
int prot = /*0*/VM_PROT_WRITE;
long s_flags = sh[i].s_flags;
if ((s_flags & COFF_STYP_DISCARD) != 0)
continue;
sh[i].s_vaddr += wp->w_base; /* RVA --> VA */
if ((s_flags & COFF_STYP_TEXT) != 0) {
/* set up command for text segment */
/* DPRINTF(("COFF text addr %lx size %ld offset %ld\n",
sh[i].s_vaddr, sh[i].s_size, sh[i].s_scnptr));
*/ pecoff_load_section(&epp->ep_vmcmds, epp->ep_vp,
&sh[i], (long *)&epp->ep_taddr,
&tsize, &prot);
} else if ((s_flags & COFF_STYP_BSS) != 0) {
/* set up command for bss segment */
baddr = sh[i].s_vaddr;
bsize = sh[i].s_paddr;
if (bsize)
NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero,
bsize, baddr, NULLVP, 0,
VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
epp->ep_daddr = min(epp->ep_daddr, baddr);
bsize = baddr + bsize - epp->ep_daddr;
epp->ep_dsize = max(epp->ep_dsize, bsize);
} else if ((s_flags & (COFF_STYP_DATA|COFF_STYP_READ)) != 0) {
/* set up command for data segment */
/* DPRINTF(("COFF data addr %lx size %ld offset %ld\n",
sh[i].s_vaddr, sh[i].s_size, sh[i].s_scnptr));*/
pecoff_load_section(&epp->ep_vmcmds, epp->ep_vp,
&sh[i], &daddr, &dsize, &prot);
epp->ep_daddr = min(epp->ep_daddr, daddr);
dsize = daddr + dsize - epp->ep_daddr;
epp->ep_dsize = max(epp->ep_dsize, dsize);
}
}
/* set up ep_emul_arg */
argp = malloc(sizeof(struct pecoff_args), M_TEMP, M_WAITOK);
epp->ep_emul_arg = argp;
argp->a_abiversion = NETBSDPE_ABI_VERSION;
argp->a_zero = 0;
argp->a_entry = wp->w_base + ap->a_entry;
argp->a_end = epp->ep_daddr + epp->ep_dsize;
argp->a_opthdr = *wp;
/*
* load dynamic linker
*/
error = pecoff_load_file(l, epp, "/usr/libexec/ld.so.dll",
&epp->ep_vmcmds, &epp->ep_entry, argp);
if (error) {
free(sh, M_TEMP);
return error;
}
#if 0
DPRINTF(("text addr: %lx size: %ld data addr: %lx size: %ld entry: %lx\n",
epp->ep_taddr, epp->ep_tsize,
epp->ep_daddr, epp->ep_dsize,
epp->ep_entry));
#endif
free(sh, M_TEMP);
return (*epp->ep_esch->es_setup_stack)(l, epp);
}
/*
* load(mmap) file. for dynamic linker (ld.so.dll)
*/
int
pecoff_load_file(struct lwp *l, struct exec_package *epp, const char *path, struct exec_vmcmd_set *vcset, u_long *entry, struct pecoff_args *argp)
{
int error, peofs, scnsiz, i;
struct vnode *vp;
struct vattr attr;
struct pecoff_dos_filehdr dh;
struct coff_filehdr *fp = 0;
struct coff_aouthdr *ap;
struct pecoff_opthdr *wp;
struct coff_scnhdr *sh = 0;
error = emul_find_interp(l, epp, path);
if (error != 0)
return error;
vp = epp->ep_interp;
epp->ep_interp = NULL;
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
/*
* If it's not marked as executable, or it's not a regular
* file, we don't allow it to be used.
*/
if (vp->v_type != VREG) {
error = EACCES;
goto badunlock;
}
if ((error = VOP_ACCESS(vp, VEXEC, l->l_cred)) != 0)
goto badunlock;
/* get attributes */
if ((error = VOP_GETATTR(vp, &attr, l->l_cred)) != 0)
goto badunlock;
/*
* Check mount point. Though we're not trying to exec this binary,
* we will be executing code from it, so if the mount point
* disallows execution or set-id-ness, we punt or kill the set-id.
*/
if (vp->v_mount->mnt_flag & MNT_NOEXEC) {
error = EACCES;
goto badunlock;
}
if (vp->v_mount->mnt_flag & MNT_NOSUID)
epp->ep_vap->va_mode &= ~(S_ISUID | S_ISGID);
if ((error = vn_marktext(vp)))
goto badunlock;
VOP_UNLOCK(vp, 0);
/*
* Read header.
*/
error = exec_read_from(l, vp, 0, &dh, sizeof(dh));
if (error != 0)
goto bad;
if ((error = pecoff_signature(l, vp, &dh)) != 0)
goto bad;
fp = malloc(PECOFF_HDR_SIZE, M_TEMP, M_WAITOK);
peofs = dh.d_peofs + sizeof(signature) - 1;
error = exec_read_from(l, vp, peofs, fp, PECOFF_HDR_SIZE);
if (error != 0)
goto bad;
if (COFF_BADMAG(fp)) {
error = ENOEXEC;
goto bad;
}
ap = (void *)((char *)fp + sizeof(struct coff_filehdr));
wp = (void *)((char *)ap + sizeof(struct coff_aouthdr));
/* read section header */
scnsiz = sizeof(struct coff_scnhdr) * fp->f_nscns;
sh = malloc(scnsiz, M_TEMP, M_WAITOK);
if ((error = exec_read_from(l, vp, peofs + PECOFF_HDR_SIZE, sh,
scnsiz)) != 0)
goto bad;
/*
* Read section header, and mmap.
*/
for (i = 0; i < fp->f_nscns; i++) {
int prot = 0;
long addr;
u_long size;
if (sh[i].s_flags & COFF_STYP_DISCARD)
continue;
/* XXX ? */
if ((sh[i].s_flags & COFF_STYP_TEXT) &&
(sh[i].s_flags & COFF_STYP_EXEC) == 0)
continue;
if ((sh[i].s_flags & (COFF_STYP_TEXT|COFF_STYP_DATA|
COFF_STYP_BSS|COFF_STYP_READ)) == 0)
continue;
sh[i].s_vaddr += wp->w_base; /* RVA --> VA */
pecoff_load_section(vcset, vp, &sh[i], &addr, &size, &prot);
}
*entry = wp->w_base + ap->a_entry;
argp->a_ldbase = wp->w_base;
argp->a_ldexport = wp->w_imghdr[0].i_vaddr + wp->w_base;
free(fp, M_TEMP);
free(sh, M_TEMP);
/*XXXUNCONST*/
vrele(vp);
return 0;
badunlock:
VOP_UNLOCK(vp, 0);
bad:
if (fp != 0)
free(fp, M_TEMP);
if (sh != 0)
free(sh, M_TEMP);
/*XXXUNCONST*/
vrele(vp);
return error;
}
int
ELFNAME2(linux,signature)(struct lwp *l, struct exec_package *epp, Elf_Ehdr *eh, char *itp)
{
size_t i;
Elf_Phdr *ph;
size_t phsize;
int error;
static const char linux[] = "Linux";
if (eh->e_ident[EI_OSABI] == 3 ||
memcmp(&eh->e_ident[EI_ABIVERSION], linux, sizeof(linux)) == 0)
return 0;
phsize = eh->e_phnum * sizeof(Elf_Phdr);
ph = (Elf_Phdr *)malloc(phsize, M_TEMP, M_WAITOK);
error = exec_read_from(l, epp->ep_vp, eh->e_phoff, ph, phsize);
if (error)
goto out;
for (i = 0; i < eh->e_phnum; i++) {
Elf_Phdr *ephp = &ph[i];
Elf_Nhdr *np;
u_int32_t *abi;
if (ephp->p_type != PT_NOTE ||
ephp->p_filesz > 1024 ||
ephp->p_filesz < sizeof(Elf_Nhdr) + 20)
continue;
np = (Elf_Nhdr *)malloc(ephp->p_filesz, M_TEMP, M_WAITOK);
error = exec_read_from(l, epp->ep_vp, ephp->p_offset, np,
ephp->p_filesz);
if (error)
goto next;
if (np->n_type != ELF_NOTE_TYPE_ABI_TAG ||
np->n_namesz != ELF_NOTE_ABI_NAMESZ ||
np->n_descsz != ELF_NOTE_ABI_DESCSZ ||
memcmp((void *)(np + 1), ELF_NOTE_ABI_NAME,
ELF_NOTE_ABI_NAMESZ))
goto next;
/* Make sure the OS is Linux. */
abi = (u_int32_t *)((char *)np + sizeof(Elf_Nhdr) +
np->n_namesz);
if (abi[0] == ELF_NOTE_ABI_OS_LINUX)
error = 0;
else
error = ENOEXEC;
free(np, M_TEMP);
goto out;
next:
free(np, M_TEMP);
continue;
}
/* Check for certain intepreter names. */
if (itp) {
if (!strncmp(itp, "/lib/ld-linux", 13) ||
#if (ELFSIZE == 64)
!strncmp(itp, "/lib64/ld-linux", 15) ||
#endif
!strncmp(itp, "/lib/ld.so.", 11))
error = 0;
else
error = ENOEXEC;
goto out;
}
error = ENOEXEC;
out:
free(ph, M_TEMP);
return (error);
}
