40339b39f9
- Change ktrace interface to pass in the current process, rather than p->p_tracep, since the various ktr* function need curproc anyway. - Add curproc as a parameter to mi_switch() since all callers had it handy anyway. - Add a second proc argument for inferior() since callers all had curproc handy. Also, miscellaneous cleanups in ktrace: - ktrace now always uses file-based, rather than vnode-based I/O (simplifies, increases type safety); eliminate KTRFLAG_FD & KTRFAC_FD. Do non-blocking I/O, and yield a finite number of times when receiving EWOULDBLOCK before giving up. - move code duplicated between sys_fktrace and sys_ktrace into ktrace_common. - simplify interface to ktrwrite()
593 lines
15 KiB
C
593 lines
15 KiB
C
/* $NetBSD: kern_exec.c,v 1.110 2000/05/27 00:40:45 sommerfeld Exp $ */
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/*-
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* Copyright (C) 1993, 1994, 1996 Christopher G. Demetriou
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* Copyright (C) 1992 Wolfgang Solfrank.
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* Copyright (C) 1992 TooLs GmbH.
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* 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 TooLs GmbH.
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* 4. The name of TooLs GmbH 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 TOOLS GMBH ``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 TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "opt_ktrace.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/filedesc.h>
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#include <sys/kernel.h>
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#include <sys/proc.h>
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#include <sys/mount.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/file.h>
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#include <sys/acct.h>
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#include <sys/exec.h>
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#include <sys/ktrace.h>
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#include <sys/resourcevar.h>
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#include <sys/wait.h>
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#include <sys/mman.h>
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#include <sys/signalvar.h>
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#include <sys/stat.h>
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#include <sys/syscallargs.h>
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#include <vm/vm.h>
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#include <vm/vm_kern.h>
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#include <uvm/uvm_extern.h>
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#include <machine/cpu.h>
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#include <machine/reg.h>
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/*
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* check exec:
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* given an "executable" described in the exec package's namei info,
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* see what we can do with it.
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*
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* ON ENTRY:
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* exec package with appropriate namei info
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* proc pointer of exec'ing proc
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* NO SELF-LOCKED VNODES
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*
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* ON EXIT:
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* error: nothing held, etc. exec header still allocated.
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* ok: filled exec package, executable's vnode (unlocked).
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*
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* EXEC SWITCH ENTRY:
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* Locked vnode to check, exec package, proc.
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*
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* EXEC SWITCH EXIT:
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* ok: return 0, filled exec package, executable's vnode (unlocked).
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* error: destructive:
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* everything deallocated execept exec header.
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* non-destructive:
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* error code, executable's vnode (unlocked),
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* exec header unmodified.
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*/
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int
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check_exec(p, epp)
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struct proc *p;
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struct exec_package *epp;
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{
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int error, i;
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struct vnode *vp;
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struct nameidata *ndp;
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size_t resid;
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ndp = epp->ep_ndp;
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ndp->ni_cnd.cn_nameiop = LOOKUP;
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ndp->ni_cnd.cn_flags = FOLLOW | LOCKLEAF | SAVENAME;
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/* first get the vnode */
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if ((error = namei(ndp)) != 0)
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return error;
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epp->ep_vp = vp = ndp->ni_vp;
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/* check access and type */
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if (vp->v_type != VREG) {
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error = EACCES;
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goto bad1;
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}
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if ((error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p)) != 0)
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goto bad1;
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/* get attributes */
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if ((error = VOP_GETATTR(vp, epp->ep_vap, p->p_ucred, p)) != 0)
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goto bad1;
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/* Check mount point */
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if (vp->v_mount->mnt_flag & MNT_NOEXEC) {
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error = EACCES;
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goto bad1;
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}
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if ((vp->v_mount->mnt_flag & MNT_NOSUID) || (p->p_flag & P_TRACED))
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epp->ep_vap->va_mode &= ~(S_ISUID | S_ISGID);
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/* try to open it */
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if ((error = VOP_OPEN(vp, FREAD, p->p_ucred, p)) != 0)
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goto bad1;
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/* unlock vp, since we need it unlocked from here on out. */
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VOP_UNLOCK(vp, 0);
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/* now we have the file, get the exec header */
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error = vn_rdwr(UIO_READ, vp, epp->ep_hdr, epp->ep_hdrlen, 0,
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UIO_SYSSPACE, 0, p->p_ucred, &resid, p);
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if (error)
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goto bad2;
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epp->ep_hdrvalid = epp->ep_hdrlen - resid;
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/*
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* set up the vmcmds for creation of the process
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* address space
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*/
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error = ENOEXEC;
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for (i = 0; i < nexecs && error != 0; i++) {
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int newerror;
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if (execsw[i].es_check == NULL)
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continue;
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newerror = (*execsw[i].es_check)(p, epp);
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/* make sure the first "interesting" error code is saved. */
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if (!newerror || error == ENOEXEC)
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error = newerror;
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if (epp->ep_flags & EXEC_DESTR && error != 0)
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return error;
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}
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if (!error) {
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/* check that entry point is sane */
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if (epp->ep_entry > VM_MAXUSER_ADDRESS)
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error = ENOEXEC;
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/* check limits */
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if ((epp->ep_tsize > MAXTSIZ) ||
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(epp->ep_dsize > p->p_rlimit[RLIMIT_DATA].rlim_cur))
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error = ENOMEM;
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if (!error)
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return (0);
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}
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/*
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* free any vmspace-creation commands,
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* and release their references
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*/
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kill_vmcmds(&epp->ep_vmcmds);
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bad2:
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/*
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* close and release the vnode, restore the old one, free the
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* pathname buf, and punt.
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*/
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vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
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VOP_CLOSE(vp, FREAD, p->p_ucred, p);
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vput(vp);
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FREE(ndp->ni_cnd.cn_pnbuf, M_NAMEI);
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return error;
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bad1:
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/*
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* free the namei pathname buffer, and put the vnode
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* (which we don't yet have open).
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*/
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vput(vp); /* was still locked */
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FREE(ndp->ni_cnd.cn_pnbuf, M_NAMEI);
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return error;
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}
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/*
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* exec system call
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*/
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/* ARGSUSED */
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int
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sys_execve(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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struct sys_execve_args /* {
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syscallarg(const char *) path;
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syscallarg(char * const *) argp;
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syscallarg(char * const *) envp;
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} */ *uap = v;
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int error, i;
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struct exec_package pack;
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struct nameidata nid;
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struct vattr attr;
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struct ucred *cred = p->p_ucred;
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char *argp;
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char * const *cpp;
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char *dp, *sp;
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long argc, envc;
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size_t len;
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char *stack;
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struct ps_strings arginfo;
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struct vmspace *vm;
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char **tmpfap;
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int szsigcode;
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extern struct emul emul_netbsd;
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/*
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* figure out the maximum size of an exec header, if necessary.
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* XXX should be able to keep LKM code from modifying exec switch
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* when we're still using it, but...
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*/
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if (exec_maxhdrsz == 0) {
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for (i = 0; i < nexecs; i++)
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if (execsw[i].es_check != NULL
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&& execsw[i].es_hdrsz > exec_maxhdrsz)
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exec_maxhdrsz = execsw[i].es_hdrsz;
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}
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/* init the namei data to point the file user's program name */
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/* XXX cgd 960926: why do this here? most will be clobbered. */
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NDINIT(&nid, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
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/*
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* initialize the fields of the exec package.
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*/
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pack.ep_name = SCARG(uap, path);
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MALLOC(pack.ep_hdr, void *, exec_maxhdrsz, M_EXEC, M_WAITOK);
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pack.ep_hdrlen = exec_maxhdrsz;
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pack.ep_hdrvalid = 0;
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pack.ep_ndp = &nid;
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pack.ep_emul_arg = NULL;
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pack.ep_vmcmds.evs_cnt = 0;
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pack.ep_vmcmds.evs_used = 0;
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pack.ep_vap = &attr;
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pack.ep_emul = &emul_netbsd;
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pack.ep_flags = 0;
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/* see if we can run it. */
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if ((error = check_exec(p, &pack)) != 0)
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goto freehdr;
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/* XXX -- THE FOLLOWING SECTION NEEDS MAJOR CLEANUP */
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/* allocate an argument buffer */
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argp = (char *) uvm_km_valloc_wait(exec_map, NCARGS);
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#ifdef DIAGNOSTIC
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if (argp == (vaddr_t) 0)
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panic("execve: argp == NULL");
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#endif
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dp = argp;
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argc = 0;
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/* copy the fake args list, if there's one, freeing it as we go */
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if (pack.ep_flags & EXEC_HASARGL) {
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tmpfap = pack.ep_fa;
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while (*tmpfap != NULL) {
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char *cp;
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cp = *tmpfap;
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while (*cp)
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*dp++ = *cp++;
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dp++;
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FREE(*tmpfap, M_EXEC);
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tmpfap++; argc++;
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}
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FREE(pack.ep_fa, M_EXEC);
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pack.ep_flags &= ~EXEC_HASARGL;
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}
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/* Now get argv & environment */
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if (!(cpp = SCARG(uap, argp))) {
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error = EINVAL;
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goto bad;
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}
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if (pack.ep_flags & EXEC_SKIPARG)
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cpp++;
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while (1) {
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len = argp + ARG_MAX - dp;
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if ((error = copyin(cpp, &sp, sizeof(sp))) != 0)
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goto bad;
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if (!sp)
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break;
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if ((error = copyinstr(sp, dp, len, &len)) != 0) {
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if (error == ENAMETOOLONG)
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error = E2BIG;
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goto bad;
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}
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dp += len;
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cpp++;
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argc++;
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}
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envc = 0;
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/* environment need not be there */
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if ((cpp = SCARG(uap, envp)) != NULL ) {
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while (1) {
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len = argp + ARG_MAX - dp;
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if ((error = copyin(cpp, &sp, sizeof(sp))) != 0)
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goto bad;
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if (!sp)
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break;
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if ((error = copyinstr(sp, dp, len, &len)) != 0) {
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if (error == ENAMETOOLONG)
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error = E2BIG;
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goto bad;
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}
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dp += len;
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cpp++;
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envc++;
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}
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}
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dp = (char *) ALIGN(dp);
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szsigcode = pack.ep_emul->e_esigcode - pack.ep_emul->e_sigcode;
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/* Now check if args & environ fit into new stack */
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if (pack.ep_flags & EXEC_32)
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len = ((argc + envc + 2 + pack.ep_emul->e_arglen) * sizeof(int) +
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sizeof(int) + dp + STACKGAPLEN + szsigcode +
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sizeof(struct ps_strings)) - argp;
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else
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len = ((argc + envc + 2 + pack.ep_emul->e_arglen) * sizeof(char *) +
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sizeof(int) + dp + STACKGAPLEN + szsigcode +
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sizeof(struct ps_strings)) - argp;
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len = ALIGN(len); /* make the stack "safely" aligned */
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if (len > pack.ep_ssize) { /* in effect, compare to initial limit */
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error = ENOMEM;
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goto bad;
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}
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/* adjust "active stack depth" for process VSZ */
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pack.ep_ssize = len; /* maybe should go elsewhere, but... */
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/*
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* Do whatever is necessary to prepare the address space
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* for remapping. Note that this might replace the current
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* vmspace with another!
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*/
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uvmspace_exec(p);
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/* Now map address space */
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vm = p->p_vmspace;
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vm->vm_taddr = (char *) pack.ep_taddr;
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vm->vm_tsize = btoc(pack.ep_tsize);
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vm->vm_daddr = (char *) pack.ep_daddr;
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vm->vm_dsize = btoc(pack.ep_dsize);
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vm->vm_ssize = btoc(pack.ep_ssize);
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vm->vm_maxsaddr = (char *) pack.ep_maxsaddr;
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/* create the new process's VM space by running the vmcmds */
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#ifdef DIAGNOSTIC
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if (pack.ep_vmcmds.evs_used == 0)
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panic("execve: no vmcmds");
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#endif
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for (i = 0; i < pack.ep_vmcmds.evs_used && !error; i++) {
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struct exec_vmcmd *vcp;
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vcp = &pack.ep_vmcmds.evs_cmds[i];
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error = (*vcp->ev_proc)(p, vcp);
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}
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/* free the vmspace-creation commands, and release their references */
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kill_vmcmds(&pack.ep_vmcmds);
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/* if an error happened, deallocate and punt */
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if (error)
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goto exec_abort;
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/* remember information about the process */
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arginfo.ps_nargvstr = argc;
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arginfo.ps_nenvstr = envc;
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stack = (char *) (USRSTACK - len);
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/* Now copy argc, args & environ to new stack */
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if (!(*pack.ep_emul->e_copyargs)(&pack, &arginfo, stack, argp))
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goto exec_abort;
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/* copy out the process's ps_strings structure */
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if (copyout(&arginfo, (char *) PS_STRINGS, sizeof(arginfo)))
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goto exec_abort;
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/* fill process ps_strings info */
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p->p_psstr = PS_STRINGS;
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p->p_psargv = offsetof(struct ps_strings, ps_argvstr);
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p->p_psnargv = offsetof(struct ps_strings, ps_nargvstr);
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p->p_psenv = offsetof(struct ps_strings, ps_envstr);
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p->p_psnenv = offsetof(struct ps_strings, ps_nenvstr);
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/* copy out the process's signal trapoline code */
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if (szsigcode) {
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if (copyout((char *)pack.ep_emul->e_sigcode,
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p->p_sigacts->ps_sigcode = (char *)PS_STRINGS - szsigcode,
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szsigcode))
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goto exec_abort;
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#ifdef PMAP_NEED_PROCWR
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/* This is code. Let the pmap do what is needed. */
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pmap_procwr(p, (vaddr_t)p->p_sigacts->ps_sigcode, szsigcode);
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#endif
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}
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stopprofclock(p); /* stop profiling */
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fdcloseexec(p); /* handle close on exec */
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execsigs(p); /* reset catched signals */
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p->p_ctxlink = NULL; /* reset ucontext link */
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/* set command name & other accounting info */
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len = min(nid.ni_cnd.cn_namelen, MAXCOMLEN);
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memcpy(p->p_comm, nid.ni_cnd.cn_nameptr, len);
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p->p_comm[len] = 0;
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p->p_acflag &= ~AFORK;
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/* record proc's vnode, for use by procfs and others */
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if (p->p_textvp)
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vrele(p->p_textvp);
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VREF(pack.ep_vp);
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p->p_textvp = pack.ep_vp;
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p->p_flag |= P_EXEC;
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if (p->p_flag & P_PPWAIT) {
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p->p_flag &= ~P_PPWAIT;
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wakeup((caddr_t) p->p_pptr);
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}
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|
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/*
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* deal with set[ug]id.
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* MNT_NOSUID and P_TRACED have already been used to disable s[ug]id.
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*/
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if (((attr.va_mode & S_ISUID) != 0 && p->p_ucred->cr_uid != attr.va_uid)
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|| ((attr.va_mode & S_ISGID) != 0 && p->p_ucred->cr_gid != attr.va_gid)){
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p->p_ucred = crcopy(cred);
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#ifdef KTRACE
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/*
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* If process is being ktraced, turn off - unless
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* root set it.
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*/
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if (p->p_tracep && !(p->p_traceflag & KTRFAC_ROOT))
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ktrderef(p);
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|
#endif
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if (attr.va_mode & S_ISUID)
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p->p_ucred->cr_uid = attr.va_uid;
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if (attr.va_mode & S_ISGID)
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p->p_ucred->cr_gid = attr.va_gid;
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p_sugid(p);
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} else
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p->p_flag &= ~P_SUGID;
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p->p_cred->p_svuid = p->p_ucred->cr_uid;
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|
p->p_cred->p_svgid = p->p_ucred->cr_gid;
|
|
|
|
doexechooks(p);
|
|
|
|
uvm_km_free_wakeup(exec_map, (vaddr_t) argp, NCARGS);
|
|
|
|
FREE(nid.ni_cnd.cn_pnbuf, M_NAMEI);
|
|
vn_lock(pack.ep_vp, LK_EXCLUSIVE | LK_RETRY);
|
|
VOP_CLOSE(pack.ep_vp, FREAD, cred, p);
|
|
vput(pack.ep_vp);
|
|
|
|
/* setup new registers and do misc. setup. */
|
|
(*pack.ep_emul->e_setregs)(p, &pack, (u_long) stack);
|
|
|
|
if (p->p_flag & P_TRACED)
|
|
psignal(p, SIGTRAP);
|
|
|
|
p->p_emul = pack.ep_emul;
|
|
FREE(pack.ep_hdr, M_EXEC);
|
|
|
|
#ifdef KTRACE
|
|
if (KTRPOINT(p, KTR_EMUL))
|
|
ktremul(p);
|
|
#endif
|
|
|
|
return (EJUSTRETURN);
|
|
|
|
bad:
|
|
/* free the vmspace-creation commands, and release their references */
|
|
kill_vmcmds(&pack.ep_vmcmds);
|
|
/* kill any opened file descriptor, if necessary */
|
|
if (pack.ep_flags & EXEC_HASFD) {
|
|
pack.ep_flags &= ~EXEC_HASFD;
|
|
(void) fdrelease(p, pack.ep_fd);
|
|
}
|
|
/* close and put the exec'd file */
|
|
vn_lock(pack.ep_vp, LK_EXCLUSIVE | LK_RETRY);
|
|
VOP_CLOSE(pack.ep_vp, FREAD, cred, p);
|
|
vput(pack.ep_vp);
|
|
FREE(nid.ni_cnd.cn_pnbuf, M_NAMEI);
|
|
uvm_km_free_wakeup(exec_map, (vaddr_t) argp, NCARGS);
|
|
|
|
freehdr:
|
|
FREE(pack.ep_hdr, M_EXEC);
|
|
return error;
|
|
|
|
exec_abort:
|
|
/*
|
|
* the old process doesn't exist anymore. exit gracefully.
|
|
* get rid of the (new) address space we have created, if any, get rid
|
|
* of our namei data and vnode, and exit noting failure
|
|
*/
|
|
uvm_deallocate(&vm->vm_map, VM_MIN_ADDRESS,
|
|
VM_MAXUSER_ADDRESS - VM_MIN_ADDRESS);
|
|
if (pack.ep_emul_arg)
|
|
FREE(pack.ep_emul_arg, M_TEMP);
|
|
FREE(nid.ni_cnd.cn_pnbuf, M_NAMEI);
|
|
vn_lock(pack.ep_vp, LK_EXCLUSIVE | LK_RETRY);
|
|
VOP_CLOSE(pack.ep_vp, FREAD, cred, p);
|
|
vput(pack.ep_vp);
|
|
uvm_km_free_wakeup(exec_map, (vaddr_t) argp, NCARGS);
|
|
FREE(pack.ep_hdr, M_EXEC);
|
|
exit1(p, W_EXITCODE(0, SIGABRT));
|
|
exit1(p, -1);
|
|
|
|
/* NOTREACHED */
|
|
return 0;
|
|
}
|
|
|
|
|
|
void *
|
|
copyargs(pack, arginfo, stack, argp)
|
|
struct exec_package *pack;
|
|
struct ps_strings *arginfo;
|
|
void *stack;
|
|
void *argp;
|
|
{
|
|
char **cpp = stack;
|
|
char *dp, *sp;
|
|
size_t len;
|
|
void *nullp = NULL;
|
|
int argc = arginfo->ps_nargvstr;
|
|
int envc = arginfo->ps_nenvstr;
|
|
|
|
if (copyout(&argc, cpp++, sizeof(argc)))
|
|
return NULL;
|
|
|
|
dp = (char *) (cpp + argc + envc + 2 + pack->ep_emul->e_arglen);
|
|
sp = argp;
|
|
|
|
/* XXX don't copy them out, remap them! */
|
|
arginfo->ps_argvstr = cpp; /* remember location of argv for later */
|
|
|
|
for (; --argc >= 0; sp += len, dp += len)
|
|
if (copyout(&dp, cpp++, sizeof(dp)) ||
|
|
copyoutstr(sp, dp, ARG_MAX, &len))
|
|
return NULL;
|
|
|
|
if (copyout(&nullp, cpp++, sizeof(nullp)))
|
|
return NULL;
|
|
|
|
arginfo->ps_envstr = cpp; /* remember location of envp for later */
|
|
|
|
for (; --envc >= 0; sp += len, dp += len)
|
|
if (copyout(&dp, cpp++, sizeof(dp)) ||
|
|
copyoutstr(sp, dp, ARG_MAX, &len))
|
|
return NULL;
|
|
|
|
if (copyout(&nullp, cpp++, sizeof(nullp)))
|
|
return NULL;
|
|
|
|
return cpp;
|
|
}
|