314 lines
8.5 KiB
C
314 lines
8.5 KiB
C
/* $NetBSD: osf1_exec_ecoff.c,v 1.9 2003/08/08 18:57:07 christos Exp $ */
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/*
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* Copyright (c) 1999 Christopher G. Demetriou. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Christopher G. Demetriou
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* for the NetBSD Project.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: osf1_exec_ecoff.c,v 1.9 2003/08/08 18:57:07 christos Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/malloc.h>
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#include <sys/namei.h>
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#include <sys/vnode.h>
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#include <sys/exec.h>
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#include <sys/exec_ecoff.h>
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#include <compat/osf1/osf1.h>
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#include <compat/common/compat_util.h>
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#include <compat/osf1/osf1_cvt.h>
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#include <compat/osf1/osf1_exec.h>
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struct osf1_exec_emul_arg {
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int flags;
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#define OSF1_EXEC_EMUL_FLAGS_HAVE_LOADER 0x01
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char exec_name[MAXPATHLEN+1];
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char loader_name[MAXPATHLEN+1];
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};
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static int osf1_exec_ecoff_dynamic(struct proc *p, struct exec_package *epp);
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int
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osf1_exec_ecoff_probe(struct proc *p, struct exec_package *epp)
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{
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struct ecoff_exechdr *execp = (struct ecoff_exechdr *)epp->ep_hdr;
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struct osf1_exec_emul_arg *emul_arg;
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int error;
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/* check if the binary is osf1 ecoff */
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if (execp->f.f_magic != ECOFF_MAGIC_ALPHA)
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return ENOEXEC;
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/* set up the exec package emul arg as appropriate */
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emul_arg = malloc(sizeof *emul_arg, M_TEMP, M_WAITOK);
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epp->ep_emul_arg = emul_arg;
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emul_arg->flags = 0;
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if (epp->ep_ndp->ni_segflg == UIO_SYSSPACE)
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error = copystr(epp->ep_ndp->ni_dirp, emul_arg->exec_name,
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MAXPATHLEN + 1, NULL);
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else
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error = copyinstr(epp->ep_ndp->ni_dirp, emul_arg->exec_name,
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MAXPATHLEN + 1, NULL);
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#ifdef DIAGNOSTIC
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if (error != 0)
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panic("osf1_exec_ecoff_probe: copyinstr failed");
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#endif
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/* do any special object file handling */
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switch (execp->f.f_flags & ECOFF_FLAG_OBJECT_TYPE_MASK) {
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case ECOFF_OBJECT_TYPE_SHARABLE:
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/* can't exec a shared library! */
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#if 0
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uprintf("can't execute OSF/1 shared libraries\n");
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#endif
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error = ENOEXEC;
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break;
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case ECOFF_OBJECT_TYPE_CALL_SHARED:
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error = osf1_exec_ecoff_dynamic(p, epp);
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break;
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default:
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/* just let the normal ECOFF handlers deal with it. */
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error = 0;
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break;
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}
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if (error) {
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free(epp->ep_emul_arg, M_TEMP);
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epp->ep_emul_arg = NULL;
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kill_vmcmds(&epp->ep_vmcmds); /* if any */
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}
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return (error);
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}
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/*
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* copy arguments onto the stack in the normal way, then copy out
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* any ELF-like AUX entries used by the dynamic loading scheme.
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*/
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int
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osf1_copyargs(p, pack, arginfo, stackp, argp)
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struct proc *p;
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struct exec_package *pack;
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struct ps_strings *arginfo;
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char **stackp;
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void *argp;
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{
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struct osf1_exec_emul_arg *emul_arg = pack->ep_emul_arg;
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struct osf1_auxv ai[OSF1_MAX_AUX_ENTRIES], *a;
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char *prognameloc, *loadernameloc;
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size_t len;
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int error;
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if ((error = copyargs(p, pack, arginfo, stackp, argp)) != 0)
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goto out;
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a = ai;
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memset(ai, 0, sizeof ai);
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prognameloc = *stackp + sizeof ai;
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if ((error = copyoutstr(emul_arg->exec_name, prognameloc,
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MAXPATHLEN + 1, NULL)) != 0)
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goto out;
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a->a_type = OSF1_AT_EXEC_FILENAME;
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a->a_un.a_ptr = prognameloc;
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a++;
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/*
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* if there's a loader, push additional auxv entries on the stack.
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*/
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if (emul_arg->flags & OSF1_EXEC_EMUL_FLAGS_HAVE_LOADER) {
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loadernameloc = prognameloc + MAXPATHLEN + 1;
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if ((error = copyoutstr(emul_arg->loader_name, loadernameloc,
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MAXPATHLEN + 1, NULL)) != 0)
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goto out;
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a->a_type = OSF1_AT_EXEC_LOADER_FILENAME;
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a->a_un.a_ptr = loadernameloc;
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a++;
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a->a_type = OSF1_AT_EXEC_LOADER_FLAGS;
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a->a_un.a_val = 0;
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if (pack->ep_vap->va_mode & S_ISUID)
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a->a_un.a_val |= OSF1_LDR_EXEC_SETUID_F;
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if (pack->ep_vap->va_mode & S_ISGID)
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a->a_un.a_val |= OSF1_LDR_EXEC_SETGID_F;
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if (p->p_flag & P_TRACED)
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a->a_un.a_val |= OSF1_LDR_EXEC_PTRACE_F;
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a++;
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}
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a->a_type = OSF1_AT_NULL;
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a->a_un.a_val = 0;
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a++;
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len = (a - ai) * sizeof(struct osf1_auxv);
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if ((error = copyout(ai, *stackp, len)) != 0)
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goto out;
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*stackp += len;
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out:
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free(pack->ep_emul_arg, M_TEMP);
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pack->ep_emul_arg = NULL;
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return error;
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}
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static int
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osf1_exec_ecoff_dynamic(struct proc *p, struct exec_package *epp)
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{
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struct osf1_exec_emul_arg *emul_arg = epp->ep_emul_arg;
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struct ecoff_exechdr ldr_exechdr;
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struct nameidata nd;
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struct vnode *ldr_vp;
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size_t resid;
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int error;
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strncpy(emul_arg->loader_name, OSF1_LDR_EXEC_DEFAULT_LOADER,
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MAXPATHLEN + 1);
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/*
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* locate the loader
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* includes /emul/osf1 if appropriate
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*/
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error = emul_find_interp(p, epp->ep_esch->es_emul->e_path,
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emul_arg->loader_name);
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if (error)
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return error;
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emul_arg->flags |= OSF1_EXEC_EMUL_FLAGS_HAVE_LOADER;
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#if 0
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uprintf("loader is %s\n", emul_arg->loader_name);
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#endif
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/*
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* open the loader, see if it's an ECOFF executable,
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* make sure the object type is amenable, then arrange to
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* load it up.
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*/
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NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE,
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emul_arg->loader_name, p);
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if ((error = namei(&nd)) != 0)
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goto bad_no_vp;
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ldr_vp = nd.ni_vp;
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/*
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* Basic access checks. Reject if:
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* not a regular file
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* exec not allowed on binary
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* exec not allowed on mount point
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*/
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if (ldr_vp->v_type != VREG) {
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error = EACCES;
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goto badunlock;
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}
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if ((error = VOP_ACCESS(ldr_vp, VEXEC, p->p_ucred, p)) != 0)
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goto badunlock;
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if (ldr_vp->v_mount->mnt_flag & MNT_NOEXEC) {
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error = EACCES;
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goto badunlock;
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}
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/*
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* If loader's mount point disallows set-id execution,
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* disable set-id.
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*/
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if (ldr_vp->v_mount->mnt_flag & MNT_NOSUID)
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epp->ep_vap->va_mode &= ~(S_ISUID | S_ISGID);
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VOP_UNLOCK(ldr_vp, 0);
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/*
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* read the header, and make sure we got all of it.
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*/
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if ((error = vn_rdwr(UIO_READ, ldr_vp, (caddr_t)&ldr_exechdr,
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sizeof ldr_exechdr, 0, UIO_SYSSPACE, 0, p->p_ucred,
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&resid, p)) != 0)
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goto bad;
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if (resid != 0) {
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error = ENOEXEC;
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goto bad;
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}
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/*
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* Check the magic. We expect it to be the native Alpha ECOFF
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* (Digital UNIX) magic number. Also make sure it's not a shared
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* lib or dynamically linked executable.
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*/
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if (ldr_exechdr.f.f_magic != ECOFF_MAGIC_ALPHA) {
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error = ENOEXEC;
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goto bad;
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}
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switch (ldr_exechdr.f.f_flags & ECOFF_FLAG_OBJECT_TYPE_MASK) {
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case ECOFF_OBJECT_TYPE_SHARABLE:
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case ECOFF_OBJECT_TYPE_CALL_SHARED:
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/* can't exec shared lib or dynamically linked executable. */
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error = ENOEXEC;
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goto bad;
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}
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switch (ldr_exechdr.a.magic) {
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case ECOFF_OMAGIC:
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error = exec_ecoff_prep_omagic(p, epp, &ldr_exechdr, ldr_vp);
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break;
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case ECOFF_NMAGIC:
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error = exec_ecoff_prep_nmagic(p, epp, &ldr_exechdr, ldr_vp);
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break;
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case ECOFF_ZMAGIC:
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error = exec_ecoff_prep_zmagic(p, epp, &ldr_exechdr, ldr_vp);
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break;
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default:
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error = ENOEXEC;
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}
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if (error)
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goto bad;
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/* finally, set up the stack. */
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error = (*epp->ep_esch->es_setup_stack)(p, epp);
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if (error)
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goto bad;
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vrele(ldr_vp);
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return (0);
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badunlock:
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VOP_UNLOCK(ldr_vp, 0);
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bad:
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vrele(ldr_vp);
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bad_no_vp:
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return (error);
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}
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