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NetBSD/sys/compat/osf1/osf1_exec_ecoff.c

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/* $NetBSD: osf1_exec_ecoff.c,v 1.24 2012/02/03 20:11:54 matt Exp $ */
/*
* Copyright (c) 1999 Christopher G. Demetriou. 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Christopher G. Demetriou
* for the NetBSD Project.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: osf1_exec_ecoff.c,v 1.24 2012/02/03 20:11:54 matt Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/kmem.h>
#include <sys/namei.h>
#include <sys/vnode.h>
#include <sys/exec.h>
#include <sys/exec_ecoff.h>
#include <compat/osf1/osf1.h>
#include <compat/common/compat_util.h>
#include <compat/osf1/osf1_cvt.h>
#include <compat/osf1/osf1_exec.h>
struct osf1_exec_emul_arg {
int flags;
#define OSF1_EXEC_EMUL_FLAGS_HAVE_LOADER 0x01
char exec_name[MAXPATHLEN+1];
char loader_name[MAXPATHLEN+1];
};
static int osf1_exec_ecoff_dynamic(struct lwp *l, struct exec_package *epp);
static void osf1_free_emul_arg(void *);
int
osf1_exec_ecoff_probe(struct lwp *l, struct exec_package *epp)
{
struct ecoff_exechdr *execp = (struct ecoff_exechdr *)epp->ep_hdr;
struct osf1_exec_emul_arg *emul_arg;
int error;
/* check if the binary is osf1 ecoff */
if (execp->f.f_magic != ECOFF_MAGIC_ALPHA)
return ENOEXEC;
/* set up the exec package emul arg as appropriate */
emul_arg = kmem_alloc(sizeof(*emul_arg), KM_SLEEP);
epp->ep_emul_arg = emul_arg;
epp->ep_emul_arg_free = osf1_free_emul_arg;
emul_arg->flags = 0;
/* this cannot overflow because both are size PATH_MAX */
strcpy(emul_arg->exec_name, epp->ep_kname);
/* do any special object file handling */
switch (execp->f.f_flags & ECOFF_FLAG_OBJECT_TYPE_MASK) {
case ECOFF_OBJECT_TYPE_SHARABLE:
/* can't exec a shared library! */
#if 0
uprintf("can't execute OSF/1 shared libraries\n");
#endif
error = ENOEXEC;
break;
case ECOFF_OBJECT_TYPE_CALL_SHARED:
error = osf1_exec_ecoff_dynamic(l, epp);
break;
default:
/* just let the normal ECOFF handlers deal with it. */
error = 0;
break;
}
if (error) {
exec_free_emul_arg(epp);
kill_vmcmds(&epp->ep_vmcmds); /* if any */
}
return (error);
}
/*
* copy arguments onto the stack in the normal way, then copy out
* any ELF-like AUX entries used by the dynamic loading scheme.
*/
int
osf1_copyargs(struct lwp *l, struct exec_package *pack, struct ps_strings *arginfo, char **stackp, void *argp)
{
struct osf1_exec_emul_arg *emul_arg = pack->ep_emul_arg;
struct osf1_auxv ai[OSF1_MAX_AUX_ENTRIES], *a;
char *prognameloc, *loadernameloc;
size_t len;
int error;
if ((error = copyargs(l, pack, arginfo, stackp, argp)) != 0)
goto out;
a = ai;
memset(ai, 0, sizeof ai);
prognameloc = *stackp + sizeof ai;
if ((error = copyoutstr(emul_arg->exec_name, prognameloc,
MAXPATHLEN + 1, NULL)) != 0)
goto out;
a->a_type = OSF1_AT_EXEC_FILENAME;
a->a_un.a_ptr = prognameloc;
a++;
/*
* if there's a loader, push additional auxv entries on the stack.
*/
if (emul_arg->flags & OSF1_EXEC_EMUL_FLAGS_HAVE_LOADER) {
loadernameloc = prognameloc + MAXPATHLEN + 1;
if ((error = copyoutstr(emul_arg->loader_name, loadernameloc,
MAXPATHLEN + 1, NULL)) != 0)
goto out;
a->a_type = OSF1_AT_EXEC_LOADER_FILENAME;
a->a_un.a_ptr = loadernameloc;
a++;
a->a_type = OSF1_AT_EXEC_LOADER_FLAGS;
a->a_un.a_val = 0;
if (pack->ep_vap->va_mode & S_ISUID)
a->a_un.a_val |= OSF1_LDR_EXEC_SETUID_F;
if (pack->ep_vap->va_mode & S_ISGID)
a->a_un.a_val |= OSF1_LDR_EXEC_SETGID_F;
if (l->l_proc->p_slflag & PSL_TRACED)
a->a_un.a_val |= OSF1_LDR_EXEC_PTRACE_F;
a++;
}
a->a_type = OSF1_AT_NULL;
a->a_un.a_val = 0;
a++;
len = (a - ai) * sizeof(struct osf1_auxv);
if ((error = copyout(ai, *stackp, len)) != 0)
goto out;
*stackp += len;
out:
exec_free_emul_arg(pack);
return error;
}
static int
osf1_exec_ecoff_dynamic(struct lwp *l, struct exec_package *epp)
{
struct osf1_exec_emul_arg *emul_arg = epp->ep_emul_arg;
struct ecoff_exechdr ldr_exechdr;
struct vnode *ldr_vp;
size_t resid;
int error;
strncpy(emul_arg->loader_name, OSF1_LDR_EXEC_DEFAULT_LOADER,
MAXPATHLEN + 1);
/*
* locate the loader
* includes /emul/osf1 if appropriate
*/
error = emul_find_interp(LIST_FIRST(&l->l_proc->p_lwps),
epp, emul_arg->loader_name);
if (error)
return error;
emul_arg->flags |= OSF1_EXEC_EMUL_FLAGS_HAVE_LOADER;
#if 0
uprintf("loader is %s\n", emul_arg->loader_name);
#endif
/*
* open the loader, see if it's an ECOFF executable,
* make sure the object type is amenable, then arrange to
* load it up.
*/
ldr_vp = epp->ep_interp;
epp->ep_interp = NULL;
vn_lock(ldr_vp, LK_EXCLUSIVE | LK_RETRY);
/*
* Basic access checks. Reject if:
* not a regular file
* exec not allowed on binary
* exec not allowed on mount point
*/
if (ldr_vp->v_type != VREG) {
error = EACCES;
goto badunlock;
}
if ((error = VOP_ACCESS(ldr_vp, VEXEC, l->l_cred)) != 0)
goto badunlock;
if (ldr_vp->v_mount->mnt_flag & MNT_NOEXEC) {
error = EACCES;
goto badunlock;
}
/*
* If loader's mount point disallows set-id execution,
* disable set-id.
*/
if (ldr_vp->v_mount->mnt_flag & MNT_NOSUID)
epp->ep_vap->va_mode &= ~(S_ISUID | S_ISGID);
VOP_UNLOCK(ldr_vp);
/*
* read the header, and make sure we got all of it.
*/
if ((error = vn_rdwr(UIO_READ, ldr_vp, (void *)&ldr_exechdr,
sizeof ldr_exechdr, 0, UIO_SYSSPACE, 0, l->l_cred,
&resid, NULL)) != 0)
goto bad;
if (resid != 0) {
error = ENOEXEC;
goto bad;
}
/*
* Check the magic. We expect it to be the native Alpha ECOFF
* (Digital UNIX) magic number. Also make sure it's not a shared
* lib or dynamically linked executable.
*/
if (ldr_exechdr.f.f_magic != ECOFF_MAGIC_ALPHA) {
error = ENOEXEC;
goto bad;
}
switch (ldr_exechdr.f.f_flags & ECOFF_FLAG_OBJECT_TYPE_MASK) {
case ECOFF_OBJECT_TYPE_SHARABLE:
case ECOFF_OBJECT_TYPE_CALL_SHARED:
/* can't exec shared lib or dynamically linked executable. */
error = ENOEXEC;
goto bad;
}
switch (ldr_exechdr.a.magic) {
case ECOFF_OMAGIC:
error = exec_ecoff_prep_omagic(l, epp, &ldr_exechdr, ldr_vp);
break;
case ECOFF_NMAGIC:
error = exec_ecoff_prep_nmagic(l, epp, &ldr_exechdr, ldr_vp);
break;
case ECOFF_ZMAGIC:
error = exec_ecoff_prep_zmagic(l, epp, &ldr_exechdr, ldr_vp);
break;
default:
error = ENOEXEC;
}
if (error)
goto bad;
/* finally, set up the stack. */
error = (*epp->ep_esch->es_setup_stack)(l, epp);
if (error)
goto bad;
vrele(ldr_vp);
return (0);
badunlock:
VOP_UNLOCK(ldr_vp);
bad:
vrele(ldr_vp);
return (error);
}
void
osf1_free_emul_arg(void *arg)
{
struct osf1_exec_emul_arg *emul_arg = arg;
KASSERT(emul_arg != NULL);
kmem_free(emul_arg, sizeof(*emul_arg));
}
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