Head

GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	lib/libkvm/kvm_proc.c	Lines:	25	230	10.9 %
Date:	2017-11-07	Branches:	10	152	6.6 %


/*	$OpenBSD: kvm_proc.c,v 1.58 2016/11/07 00:26:33 guenther Exp $	*/
/*	$NetBSD: kvm_proc.c,v 1.30 1999/03/24 05:50:50 mrg Exp $	*/
/*-
 * Copyright (c) 1998 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Charles M. Hannum.
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``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 FOUNDATION OR CONTRIBUTORS
 * 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.
 */
/*-
 * Copyright (c) 1994, 1995 Charles M. Hannum.  All rights reserved.
 * Copyright (c) 1989, 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software developed by the Computer Systems
 * Engineering group at Lawrence Berkeley Laboratory under DARPA contract
 * BG 91-66 and contributed to Berkeley.
 *
 * 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. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
 */

/*
 * Proc traversal interface for kvm.  ps and w are (probably) the exclusive
 * users of this code, so we've factored it out into a separate module.
 * Thus, we keep this grunge out of the other kvm applications (i.e.,
 * most other applications are interested only in open/close/read/nlist).
 */

#define __need_process
#include <sys/param.h>
#include <sys/proc.h>
#include <sys/exec.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/tty.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <nlist.h>
#include <kvm.h>
#include <errno.h>

#include <uvm/uvm_extern.h>
#include <uvm/uvm_amap.h>
#include <machine/vmparam.h>
#include <machine/pmap.h>

#include <sys/sysctl.h>

#include <limits.h>
#include <db.h>
#include <paths.h>

#include "kvm_private.h"


static char	*_kvm_ureadm(kvm_t *, const struct kinfo_proc *, u_long, u_long *);
static ssize_t	kvm_ureadm(kvm_t *, const struct kinfo_proc *, u_long, char *, size_t);

static char	**kvm_argv(kvm_t *, const struct kinfo_proc *, u_long, int, int);

static char	**kvm_doargv(kvm_t *, const struct kinfo_proc *, int,
		    void (*)(struct ps_strings *, u_long *, int *));
static int	proc_verify(kvm_t *, const struct kinfo_proc *);
static void	ps_str_a(struct ps_strings *, u_long *, int *);
static void	ps_str_e(struct ps_strings *, u_long *, int *);

static struct vm_anon *
_kvm_findanon(kvm_t *kd, struct vm_amap *amapp, int slot)
{
	u_long addr;
	int bucket;
	struct vm_amap amap;
	struct vm_amap_chunk chunk, *chunkp;
	struct vm_anon *anonp;

	addr = (u_long)amapp;
	if (KREAD(kd, addr, &amap))
		return (NULL);

	/* sanity-check slot number */
	if (slot > amap.am_nslot)
		return (NULL);

	if (UVM_AMAP_SMALL(&amap))
		chunkp = &amapp->am_small;
	else {
		bucket = UVM_AMAP_BUCKET(&amap, slot);
		addr = (u_long)(amap.am_buckets + bucket);
		if (KREAD(kd, addr, &chunkp))
			return (NULL);

		while (chunkp != NULL) {
			addr = (u_long)chunkp;
			if (KREAD(kd, addr, &chunk))
				return (NULL);

			if (UVM_AMAP_BUCKET(&amap, chunk.ac_baseslot) !=
			    bucket)
				return (NULL);
			if (slot >= chunk.ac_baseslot &&
			    slot < chunk.ac_baseslot + chunk.ac_nslot)
				break;

			chunkp = TAILQ_NEXT(&chunk, ac_list);
		}
		if (chunkp == NULL)
			return (NULL);
	}

	addr = (u_long)&chunkp->ac_anon[UVM_AMAP_SLOTIDX(slot)];
	if (KREAD(kd, addr, &anonp))
		return (NULL);

	return (anonp);
}

static char *
_kvm_ureadm(kvm_t *kd, const struct kinfo_proc *p, u_long va, u_long *cnt)
{
	u_long addr, offset, slot;
	struct vmspace vm;
	struct vm_anon *anonp, anon;
	struct vm_map_entry vme;
	struct vm_page pg;
	unsigned long rboff;

	if (kd->swapspc == 0) {
		kd->swapspc = _kvm_malloc(kd, kd->nbpg);
		if (kd->swapspc == 0)
			return (NULL);
	}

	rboff = (unsigned long)&vme.daddrs.addr_entry - (unsigned long)&vme;

	/*
	 * Look through the address map for the memory object
	 * that corresponds to the given virtual address.
	 */
	if (KREAD(kd, (u_long)p->p_vmspace, &vm))
		return (NULL);
	addr = (u_long)&vm.vm_map.addr.rbh_root.rbt_root;
	while (1) {
		if (addr == 0)
			return (NULL);
		addr -= rboff;
		if (KREAD(kd, addr, &vme))
			return (NULL);

		if (va < vme.start)
			addr = (u_long)vme.daddrs.addr_entry.rbt_left;
		else if (va >= vme.end + vme.guard + vme.fspace)
			addr = (u_long)vme.daddrs.addr_entry.rbt_right;
		else if (va >= vme.end)
			return (NULL);
		else
			break;
	}

	/*
	 * we found the map entry, now to find the object...
	 */
	if (vme.aref.ar_amap == NULL)
		return (NULL);

	offset = va - vme.start;
	slot = offset / kd->nbpg + vme.aref.ar_pageoff;

	anonp = _kvm_findanon(kd, vme.aref.ar_amap, slot);
	if (anonp == NULL)
		return (NULL);

	addr = (u_long)anonp;
	if (KREAD(kd, addr, &anon))
		return (NULL);

	addr = (u_long)anon.an_page;
	if (addr) {
		if (KREAD(kd, addr, &pg))
			return (NULL);

		if (_kvm_pread(kd, kd->pmfd, (void *)kd->swapspc,
		    (size_t)kd->nbpg, (off_t)pg.phys_addr) != kd->nbpg)
			return (NULL);
	} else {
		if (kd->swfd == -1 ||
		    _kvm_pread(kd, kd->swfd, (void *)kd->swapspc,
		    (size_t)kd->nbpg,
		    (off_t)(anon.an_swslot * kd->nbpg)) != kd->nbpg)
			return (NULL);
	}

	/* Found the page. */
	offset %= kd->nbpg;
	*cnt = kd->nbpg - offset;
	return (&kd->swapspc[offset]);
}

void *
_kvm_reallocarray(kvm_t *kd, void *p, size_t i, size_t n)
{
	void *np = reallocarray(p, i, n);

	if (np == 0)
		_kvm_err(kd, kd->program, "out of memory");
	return (np);
}

/*
 * Read in an argument vector from the user address space of process p.
 * addr if the user-space base address of narg null-terminated contiguous
 * strings.  This is used to read in both the command arguments and
 * environment strings.  Read at most maxcnt characters of strings.
 */
static char **
kvm_argv(kvm_t *kd, const struct kinfo_proc *p, u_long addr, int narg,
    int maxcnt)
{
	char *np, *cp, *ep, *ap, **argv;
	u_long oaddr = -1;
	int len, cc;

	/*
	 * Check that there aren't an unreasonable number of arguments,
	 * and that the address is in user space.
	 */
	if (narg > ARG_MAX || addr < VM_MIN_ADDRESS || addr >= VM_MAXUSER_ADDRESS)
		return (0);

	if (kd->argv == 0) {
		/*
		 * Try to avoid reallocs.
		 */
		kd->argc = MAX(narg + 1, 32);
		kd->argv = _kvm_reallocarray(kd, NULL, kd->argc,
		    sizeof(*kd->argv));
		if (kd->argv == 0)
			return (0);
	} else if (narg + 1 > kd->argc) {
		kd->argc = MAX(2 * kd->argc, narg + 1);
		kd->argv = (char **)_kvm_reallocarray(kd, kd->argv, kd->argc,
		    sizeof(*kd->argv));
		if (kd->argv == 0)
			return (0);
	}
	if (kd->argspc == 0) {
		kd->argspc = _kvm_malloc(kd, kd->nbpg);
		if (kd->argspc == 0)
			return (0);
		kd->arglen = kd->nbpg;
	}
	if (kd->argbuf == 0) {
		kd->argbuf = _kvm_malloc(kd, kd->nbpg);
		if (kd->argbuf == 0)
			return (0);
	}
	cc = sizeof(char *) * narg;
	if (kvm_ureadm(kd, p, addr, (char *)kd->argv, cc) != cc)
		return (0);
	ap = np = kd->argspc;
	argv = kd->argv;
	len = 0;

	/*
	 * Loop over pages, filling in the argument vector.
	 */
	while (argv < kd->argv + narg && *argv != 0) {
		addr = (u_long)*argv & ~(kd->nbpg - 1);
		if (addr != oaddr) {
			if (kvm_ureadm(kd, p, addr, kd->argbuf, kd->nbpg) !=
			    kd->nbpg)
				return (0);
			oaddr = addr;
		}
		addr = (u_long)*argv & (kd->nbpg - 1);
		cp = kd->argbuf + addr;
		cc = kd->nbpg - addr;
		if (maxcnt > 0 && cc > maxcnt - len)
			cc = maxcnt - len;
		ep = memchr(cp, '\0', cc);
		if (ep != 0)
			cc = ep - cp + 1;
		if (len + cc > kd->arglen) {
			int off;
			char **pp;
			char *op = kd->argspc;
			char *newp;

			newp = _kvm_reallocarray(kd, kd->argspc,
			    kd->arglen, 2);
			if (newp == 0)
				return (0);
			kd->argspc = newp;
			kd->arglen *= 2;
			/*
			 * Adjust argv pointers in case realloc moved
			 * the string space.
			 */
			off = kd->argspc - op;
			for (pp = kd->argv; pp < argv; pp++)
				*pp += off;
			ap += off;
			np += off;
		}
		memcpy(np, cp, cc);
		np += cc;
		len += cc;
		if (ep != 0) {
			*argv++ = ap;
			ap = np;
		} else
			*argv += cc;
		if (maxcnt > 0 && len >= maxcnt) {
			/*
			 * We're stopping prematurely.  Terminate the
			 * current string.
			 */
			if (ep == 0) {
				*np = '\0';
				*argv++ = ap;
			}
			break;
		}
	}
	/* Make sure argv is terminated. */
	*argv = 0;
	return (kd->argv);
}

static void
ps_str_a(struct ps_strings *p, u_long *addr, int *n)
{
	*addr = (u_long)p->ps_argvstr;
	*n = p->ps_nargvstr;
}

static void
ps_str_e(struct ps_strings *p, u_long *addr, int *n)
{
	*addr = (u_long)p->ps_envstr;
	*n = p->ps_nenvstr;
}

/*
 * Determine if the proc indicated by p is still active.
 * This test is not 100% foolproof in theory, but chances of
 * being wrong are very low.
 */
static int
proc_verify(kvm_t *kd, const struct kinfo_proc *p)
{
	struct proc kernproc;
	struct process kernprocess;

	if (p->p_psflags & (PS_EMBRYO | PS_ZOMBIE))
		return (0);

	/*
	 * Just read in the whole proc.  It's not that big relative
	 * to the cost of the read system call.
	 */
	if (KREAD(kd, (u_long)p->p_paddr, &kernproc))
		return (0);
	if (KREAD(kd, (u_long)kernproc.p_p, &kernprocess))
		return (0);
	if (p->p_pid != kernprocess.ps_pid)
		return (0);
	return ((kernprocess.ps_flags & (PS_EMBRYO | PS_ZOMBIE)) == 0);
}

static char **
kvm_doargv(kvm_t *kd, const struct kinfo_proc *p, int nchr,
    void (*info)(struct ps_strings *, u_long *, int *))
{
	static struct ps_strings *ps;
	struct ps_strings arginfo;
	u_long addr;
	char **ap;
	int cnt;

	if (ps == NULL) {
		struct _ps_strings _ps;
		int mib[2];
		size_t len;

		mib[0] = CTL_VM;
		mib[1] = VM_PSSTRINGS;
		len = sizeof(_ps);
		sysctl(mib, 2, &_ps, &len, NULL, 0);
		ps = (struct ps_strings *)_ps.val;
	}

	/*
	 * Pointers are stored at the top of the user stack.
	 */
	if (p->p_psflags & (PS_EMBRYO | PS_ZOMBIE) ||
	    kvm_ureadm(kd, p, (u_long)ps, (char *)&arginfo,
	    sizeof(arginfo)) != sizeof(arginfo))
		return (0);

	(*info)(&arginfo, &addr, &cnt);
	if (cnt == 0)
		return (0);
	ap = kvm_argv(kd, p, addr, cnt, nchr);
	/*
	 * For live kernels, make sure this process didn't go away.
	 */
	if (ap != 0 && ISALIVE(kd) && !proc_verify(kd, p))
		ap = 0;
	return (ap);
}

static char **
kvm_arg_sysctl(kvm_t *kd, pid_t pid, int nchr, int env)
{
	size_t len, orglen;
	int mib[4], ret;
	char *buf;

	orglen = env ? kd->nbpg : 8 * kd->nbpg;	/* XXX - should be ARG_MAX */
	if (kd->argbuf == NULL &&
	    (kd->argbuf = _kvm_malloc(kd, orglen)) == NULL)
		return (NULL);

again:
	mib[0] = CTL_KERN;
	mib[1] = KERN_PROC_ARGS;
	mib[2] = (int)pid;
	mib[3] = env ? KERN_PROC_ENV : KERN_PROC_ARGV;

	len = orglen;
	ret = (sysctl(mib, 4, kd->argbuf, &len, NULL, 0) < 0);
	if (ret && errno == ENOMEM) {
		buf = _kvm_reallocarray(kd, kd->argbuf, orglen, 2);
		if (buf == NULL)
			return (NULL);
		orglen *= 2;
		kd->argbuf = buf;
		goto again;
	}

	if (ret) {
		free(kd->argbuf);
		kd->argbuf = NULL;
		_kvm_syserr(kd, kd->program, "kvm_arg_sysctl");
		return (NULL);
	}
#if 0
	for (argv = (char **)kd->argbuf; *argv != NULL; argv++)
		if (strlen(*argv) > nchr)
			*argv[nchr] = '\0';
#endif

	return (char **)(kd->argbuf);
}

/*
 * Get the command args.  This code is now machine independent.
 */
char **
kvm_getargv(kvm_t *kd, const struct kinfo_proc *kp, int nchr)
{
	if (ISALIVE(kd))
		return (kvm_arg_sysctl(kd, kp->p_pid, nchr, 0));
	return (kvm_doargv(kd, kp, nchr, ps_str_a));
}

char **
kvm_getenvv(kvm_t *kd, const struct kinfo_proc *kp, int nchr)
{
	if (ISALIVE(kd))
		return (kvm_arg_sysctl(kd, kp->p_pid, nchr, 1));
	return (kvm_doargv(kd, kp, nchr, ps_str_e));
}

/*
 * Read from user space.  The user context is given by p.
 */
static ssize_t
kvm_ureadm(kvm_t *kd, const struct kinfo_proc *p, u_long uva, char *buf,
    size_t len)
{
	char *cp = buf;

	while (len > 0) {
		u_long cnt;
		size_t cc;
		char *dp;

		dp = _kvm_ureadm(kd, p, uva, &cnt);
		if (dp == 0) {
			_kvm_err(kd, 0, "invalid address (%lx)", uva);
			return (0);
		}
		cc = (size_t)MIN(cnt, len);
		memcpy(cp, dp, cc);
		cp += cc;
		uva += cc;
		len -= cc;
	}
	return (ssize_t)(cp - buf);
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: kvm_proc.c,v 1.58 2016/11/07 00:26:33 guenther Exp $ */
2			/* $NetBSD: kvm_proc.c,v 1.30 1999/03/24 05:50:50 mrg Exp $ */
3			/*-
4			* Copyright (c) 1998 The NetBSD Foundation, Inc.
5			* All rights reserved.
6			*
7			* This code is derived from software contributed to The NetBSD Foundation
8			* by Charles M. Hannum.
9			*
10			* Redistribution and use in source and binary forms, with or without
11			* modification, are permitted provided that the following conditions
12			* are met:
13			* 1. Redistributions of source code must retain the above copyright
14			* notice, this list of conditions and the following disclaimer.
15			* 2. Redistributions in binary form must reproduce the above copyright
16			* notice, this list of conditions and the following disclaimer in the
17			* documentation and/or other materials provided with the distribution.
18			*
19			* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20			* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21			* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22			* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23			* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24			* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25			* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26			* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27			* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28			* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29			* POSSIBILITY OF SUCH DAMAGE.
30			*/
31			/*-
32			* Copyright (c) 1994, 1995 Charles M. Hannum. All rights reserved.
33			* Copyright (c) 1989, 1992, 1993
34			* The Regents of the University of California. All rights reserved.
35			*
36			* This code is derived from software developed by the Computer Systems
37			* Engineering group at Lawrence Berkeley Laboratory under DARPA contract
38			* BG 91-66 and contributed to Berkeley.
39			*
40			* Redistribution and use in source and binary forms, with or without
41			* modification, are permitted provided that the following conditions
42			* are met:
43			* 1. Redistributions of source code must retain the above copyright
44			* notice, this list of conditions and the following disclaimer.
45			* 2. Redistributions in binary form must reproduce the above copyright
46			* notice, this list of conditions and the following disclaimer in the
47			* documentation and/or other materials provided with the distribution.
48			* 3. Neither the name of the University nor the names of its contributors
49			* may be used to endorse or promote products derived from this software
50			* without specific prior written permission.
51			*
52			* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
53			* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
54			* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
55			* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
56			* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
57			* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
58			* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
59			* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
60			* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
61			* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
62			* SUCH DAMAGE.
63			*/
64
65			/*
66			* Proc traversal interface for kvm. ps and w are (probably) the exclusive
67			* users of this code, so we've factored it out into a separate module.
68			* Thus, we keep this grunge out of the other kvm applications (i.e.,
69			* most other applications are interested only in open/close/read/nlist).
70			*/
71
72			#define __need_process
73			#include <sys/param.h>
74			#include <sys/proc.h>
75			#include <sys/exec.h>
76			#include <sys/stat.h>
77			#include <sys/ioctl.h>
78			#include <sys/tty.h>
79			#include <stdlib.h>
80			#include <string.h>
81			#include <unistd.h>
82			#include <nlist.h>
83			#include <kvm.h>
84			#include <errno.h>
85
86			#include <uvm/uvm_extern.h>
87			#include <uvm/uvm_amap.h>
88			#include <machine/vmparam.h>
89			#include <machine/pmap.h>
90
91			#include <sys/sysctl.h>
92
93			#include <limits.h>
94			#include <db.h>
95			#include <paths.h>
96
97			#include "kvm_private.h"
98
99
100			static char _kvm_ureadm(kvm_t , const struct kinfo_proc , u_long, u_long );
101			static ssize_t kvm_ureadm(kvm_t , const struct kinfo_proc , u_long, char *, size_t);
102
103			static char *kvm_argv(kvm_t , const struct kinfo_proc *, u_long, int, int);
104
105			static char *kvm_doargv(kvm_t , const struct kinfo_proc *, int,
106			void ()(struct ps_strings , u_long , int ));
107			static int proc_verify(kvm_t , const struct kinfo_proc );
108			static void ps_str_a(struct ps_strings , u_long , int *);
109			static void ps_str_e(struct ps_strings , u_long , int *);
110
111			static struct vm_anon *
112			_kvm_findanon(kvm_t kd, struct vm_amap amapp, int slot)
113			{
114			u_long addr;
115			int bucket;
116			struct vm_amap amap;
117			struct vm_amap_chunk chunk, *chunkp;
118			struct vm_anon *anonp;
119
120			addr = (u_long)amapp;
121			if (KREAD(kd, addr, &amap))
122			return (NULL);
123
124			/* sanity-check slot number */
125			if (slot > amap.am_nslot)
126			return (NULL);
127
128			if (UVM_AMAP_SMALL(&amap))
129			chunkp = &amapp->am_small;
130			else {
131			bucket = UVM_AMAP_BUCKET(&amap, slot);
132			addr = (u_long)(amap.am_buckets + bucket);
133			if (KREAD(kd, addr, &chunkp))
134			return (NULL);
135
136			while (chunkp != NULL) {
137			addr = (u_long)chunkp;
138			if (KREAD(kd, addr, &chunk))
139			return (NULL);
140
141			if (UVM_AMAP_BUCKET(&amap, chunk.ac_baseslot) !=
142			bucket)
143			return (NULL);
144			if (slot >= chunk.ac_baseslot &&
145			slot < chunk.ac_baseslot + chunk.ac_nslot)
146			break;
147
148			chunkp = TAILQ_NEXT(&chunk, ac_list);
149			}
150			if (chunkp == NULL)
151			return (NULL);
152			}
153
154			addr = (u_long)&chunkp->ac_anon[UVM_AMAP_SLOTIDX(slot)];
155			if (KREAD(kd, addr, &anonp))
156			return (NULL);
157
158			return (anonp);
159			}
160
161			static char *
162			_kvm_ureadm(kvm_t kd, const struct kinfo_proc p, u_long va, u_long *cnt)
163			{
164			u_long addr, offset, slot;
165			struct vmspace vm;
166			struct vm_anon *anonp, anon;
167			struct vm_map_entry vme;
168			struct vm_page pg;
169			unsigned long rboff;
170
171			if (kd->swapspc == 0) {
172			kd->swapspc = _kvm_malloc(kd, kd->nbpg);
173			if (kd->swapspc == 0)
174			return (NULL);
175			}
176
177			rboff = (unsigned long)&vme.daddrs.addr_entry - (unsigned long)&vme;
178
179			/*
180			* Look through the address map for the memory object
181			* that corresponds to the given virtual address.
182			*/
183			if (KREAD(kd, (u_long)p->p_vmspace, &vm))
184			return (NULL);
185			addr = (u_long)&vm.vm_map.addr.rbh_root.rbt_root;
186			while (1) {
187			if (addr == 0)
188			return (NULL);
189			addr -= rboff;
190			if (KREAD(kd, addr, &vme))
191			return (NULL);
192
193			if (va < vme.start)
194			addr = (u_long)vme.daddrs.addr_entry.rbt_left;
195			else if (va >= vme.end + vme.guard + vme.fspace)
196			addr = (u_long)vme.daddrs.addr_entry.rbt_right;
197			else if (va >= vme.end)
198			return (NULL);
199			else
200			break;
201			}
202
203			/*
204			* we found the map entry, now to find the object...
205			*/
206			if (vme.aref.ar_amap == NULL)
207			return (NULL);
208
209			offset = va - vme.start;
210			slot = offset / kd->nbpg + vme.aref.ar_pageoff;
211
212			anonp = _kvm_findanon(kd, vme.aref.ar_amap, slot);
213			if (anonp == NULL)
214			return (NULL);
215
216			addr = (u_long)anonp;
217			if (KREAD(kd, addr, &anon))
218			return (NULL);
219
220			addr = (u_long)anon.an_page;
221			if (addr) {
222			if (KREAD(kd, addr, &pg))
223			return (NULL);
224
225			if (_kvm_pread(kd, kd->pmfd, (void *)kd->swapspc,
226			(size_t)kd->nbpg, (off_t)pg.phys_addr) != kd->nbpg)
227			return (NULL);
228			} else {
229			if (kd->swfd == -1 \|\|
230			_kvm_pread(kd, kd->swfd, (void *)kd->swapspc,
231			(size_t)kd->nbpg,
232			(off_t)(anon.an_swslot * kd->nbpg)) != kd->nbpg)
233			return (NULL);
234			}
235
236			/* Found the page. */
237			offset %= kd->nbpg;
238			*cnt = kd->nbpg - offset;
239			return (&kd->swapspc[offset]);
240			}
241
242			void *
243			_kvm_reallocarray(kvm_t kd, void p, size_t i, size_t n)
244			{
245			void *np = reallocarray(p, i, n);
246
247			if (np == 0)
248			_kvm_err(kd, kd->program, "out of memory");
249			return (np);
250			}
251
252			/*
253			* Read in an argument vector from the user address space of process p.
254			* addr if the user-space base address of narg null-terminated contiguous
255			* strings. This is used to read in both the command arguments and
256			* environment strings. Read at most maxcnt characters of strings.
257			*/
258			static char **
259			kvm_argv(kvm_t kd, const struct kinfo_proc p, u_long addr, int narg,
260			int maxcnt)
261			{
262			char np, cp, ep, ap, **argv;
263			u_long oaddr = -1;
264			int len, cc;
265
266			/*
267			* Check that there aren't an unreasonable number of arguments,
268			* and that the address is in user space.
269			*/
270			if (narg > ARG_MAX \|\| addr < VM_MIN_ADDRESS \|\| addr >= VM_MAXUSER_ADDRESS)
271			return (0);
272
273			if (kd->argv == 0) {
274			/*
275			* Try to avoid reallocs.
276			*/
277			kd->argc = MAX(narg + 1, 32);
278			kd->argv = _kvm_reallocarray(kd, NULL, kd->argc,
279			sizeof(*kd->argv));
280			if (kd->argv == 0)
281			return (0);
282			} else if (narg + 1 > kd->argc) {
283			kd->argc = MAX(2 * kd->argc, narg + 1);
284			kd->argv = (char **)_kvm_reallocarray(kd, kd->argv, kd->argc,
285			sizeof(*kd->argv));
286			if (kd->argv == 0)
287			return (0);
288			}
289			if (kd->argspc == 0) {
290			kd->argspc = _kvm_malloc(kd, kd->nbpg);
291			if (kd->argspc == 0)
292			return (0);
293			kd->arglen = kd->nbpg;
294			}
295			if (kd->argbuf == 0) {
296			kd->argbuf = _kvm_malloc(kd, kd->nbpg);
297			if (kd->argbuf == 0)
298			return (0);
299			}
300			cc = sizeof(char ) narg;
301			if (kvm_ureadm(kd, p, addr, (char *)kd->argv, cc) != cc)
302			return (0);
303			ap = np = kd->argspc;
304			argv = kd->argv;
305			len = 0;
306
307			/*
308			* Loop over pages, filling in the argument vector.
309			*/
310			while (argv < kd->argv + narg && *argv != 0) {
311			addr = (u_long)*argv & ~(kd->nbpg - 1);
312			if (addr != oaddr) {
313			if (kvm_ureadm(kd, p, addr, kd->argbuf, kd->nbpg) !=
314			kd->nbpg)
315			return (0);
316			oaddr = addr;
317			}
318			addr = (u_long)*argv & (kd->nbpg - 1);
319			cp = kd->argbuf + addr;
320			cc = kd->nbpg - addr;
321			if (maxcnt > 0 && cc > maxcnt - len)
322			cc = maxcnt - len;
323			ep = memchr(cp, '\0', cc);
324			if (ep != 0)
325			cc = ep - cp + 1;
326			if (len + cc > kd->arglen) {
327			int off;
328			char **pp;
329			char *op = kd->argspc;
330			char *newp;
331
332			newp = _kvm_reallocarray(kd, kd->argspc,
333			kd->arglen, 2);
334			if (newp == 0)
335			return (0);
336			kd->argspc = newp;
337			kd->arglen *= 2;
338			/*
339			* Adjust argv pointers in case realloc moved
340			* the string space.
341			*/
342			off = kd->argspc - op;
343			for (pp = kd->argv; pp < argv; pp++)
344			*pp += off;
345			ap += off;
346			np += off;
347			}
348			memcpy(np, cp, cc);
349			np += cc;
350			len += cc;
351			if (ep != 0) {
352			*argv++ = ap;
353			ap = np;
354			} else
355			*argv += cc;
356			if (maxcnt > 0 && len >= maxcnt) {
357			/*
358			* We're stopping prematurely. Terminate the
359			* current string.
360			*/
361			if (ep == 0) {
362			*np = '\0';
363			*argv++ = ap;
364			}
365			break;
366			}
367			}
368			/* Make sure argv is terminated. */
369			*argv = 0;
370			return (kd->argv);
371			}
372
373			static void
374			ps_str_a(struct ps_strings p, u_long addr, int *n)
375			{
376			*addr = (u_long)p->ps_argvstr;
377			*n = p->ps_nargvstr;
378			}
379
380			static void
381			ps_str_e(struct ps_strings p, u_long addr, int *n)
382			{
383			*addr = (u_long)p->ps_envstr;
384			*n = p->ps_nenvstr;
385			}
386
387			/*
388			* Determine if the proc indicated by p is still active.
389			* This test is not 100% foolproof in theory, but chances of
390			* being wrong are very low.
391			*/
392			static int
393			proc_verify(kvm_t kd, const struct kinfo_proc p)
394			{
395			struct proc kernproc;
396			struct process kernprocess;
397
398			if (p->p_psflags & (PS_EMBRYO \| PS_ZOMBIE))
399			return (0);
400
401			/*
402			* Just read in the whole proc. It's not that big relative
403			* to the cost of the read system call.
404			*/
405			if (KREAD(kd, (u_long)p->p_paddr, &kernproc))
406			return (0);
407			if (KREAD(kd, (u_long)kernproc.p_p, &kernprocess))
408			return (0);
409			if (p->p_pid != kernprocess.ps_pid)
410			return (0);
411			return ((kernprocess.ps_flags & (PS_EMBRYO \| PS_ZOMBIE)) == 0);
412			}
413
414			static char **
415			kvm_doargv(kvm_t kd, const struct kinfo_proc p, int nchr,
416			void (info)(struct ps_strings , u_long , int ))
417			{
418			static struct ps_strings *ps;
419			struct ps_strings arginfo;
420			u_long addr;
421			char **ap;
422			int cnt;
423
424			if (ps == NULL) {
425			struct _ps_strings _ps;
426			int mib[2];
427			size_t len;
428
429			mib[0] = CTL_VM;
430			mib[1] = VM_PSSTRINGS;
431			len = sizeof(_ps);
432			sysctl(mib, 2, &_ps, &len, NULL, 0);
433			ps = (struct ps_strings *)_ps.val;
434			}
435
436			/*
437			* Pointers are stored at the top of the user stack.
438			*/
439			if (p->p_psflags & (PS_EMBRYO \| PS_ZOMBIE) \|\|
440			kvm_ureadm(kd, p, (u_long)ps, (char *)&arginfo,
441			sizeof(arginfo)) != sizeof(arginfo))
442			return (0);
443
444			(*info)(&arginfo, &addr, &cnt);
445			if (cnt == 0)
446			return (0);
447			ap = kvm_argv(kd, p, addr, cnt, nchr);
448			/*
449			* For live kernels, make sure this process didn't go away.
450			*/
451			if (ap != 0 && ISALIVE(kd) && !proc_verify(kd, p))
452			ap = 0;
453			return (ap);
454			}
455
456			static char **
457			kvm_arg_sysctl(kvm_t *kd, pid_t pid, int nchr, int env)
458			{
459		3370	size_t len, orglen;
460		1685	int mib[4], ret;
461			char *buf;
462
463		1685	orglen = env ? kd->nbpg : 8 * kd->nbpg; /* XXX - should be ARG_MAX */
464	✓✓✗✓	2376	if (kd->argbuf == NULL &&
465		691	(kd->argbuf = _kvm_malloc(kd, orglen)) == NULL)
466			return (NULL);
467
468			again:
469		1685	mib[0] = CTL_KERN;
470		1685	mib[1] = KERN_PROC_ARGS;
471		1685	mib[2] = (int)pid;
472		1685	mib[3] = env ? KERN_PROC_ENV : KERN_PROC_ARGV;
473
474		1685	len = orglen;
475		1685	ret = (sysctl(mib, 4, kd->argbuf, &len, NULL, 0) < 0);
476	✓✓✗✓	1865	if (ret && errno == ENOMEM) {
477			buf = _kvm_reallocarray(kd, kd->argbuf, orglen, 2);
478			if (buf == NULL)
479			return (NULL);
480			orglen *= 2;
481			kd->argbuf = buf;
482			goto again;
483			}
484
485	✓✓	1685	if (ret) {
486		180	free(kd->argbuf);
487		180	kd->argbuf = NULL;
488		180	_kvm_syserr(kd, kd->program, "kvm_arg_sysctl");
489		180	return (NULL);
490			}
491			#if 0
492			for (argv = (char *)kd->argbuf; argv != NULL; argv++)
493			if (strlen(*argv) > nchr)
494			*argv[nchr] = '\0';
495			#endif
496
497		1505	return (char **)(kd->argbuf);
498		1685	}
499
500			/*
501			* Get the command args. This code is now machine independent.
502			*/
503			char **
504			kvm_getargv(kvm_t kd, const struct kinfo_proc kp, int nchr)
505			{
506	✓✗	2670	if (ISALIVE(kd))
507		1335	return (kvm_arg_sysctl(kd, kp->p_pid, nchr, 0));
508			return (kvm_doargv(kd, kp, nchr, ps_str_a));
509		1335	}
510
511			char **
512			kvm_getenvv(kvm_t kd, const struct kinfo_proc kp, int nchr)
513			{
514	✓✗	700	if (ISALIVE(kd))
515		350	return (kvm_arg_sysctl(kd, kp->p_pid, nchr, 1));
516			return (kvm_doargv(kd, kp, nchr, ps_str_e));
517		350	}
518
519			/*
520			* Read from user space. The user context is given by p.
521			*/
522			static ssize_t
523			kvm_ureadm(kvm_t kd, const struct kinfo_proc p, u_long uva, char *buf,
524			size_t len)
525			{
526			char *cp = buf;
527
528			while (len > 0) {
529			u_long cnt;
530			size_t cc;
531			char *dp;
532
533			dp = _kvm_ureadm(kd, p, uva, &cnt);
534			if (dp == 0) {
535			_kvm_err(kd, 0, "invalid address (%lx)", uva);
536			return (0);
537			}
538			cc = (size_t)MIN(cnt, len);
539			memcpy(cp, dp, cc);
540			cp += cc;
541			uva += cc;
542			len -= cc;
543			}
544			return (ssize_t)(cp - buf);
545			}