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NetBSD/usr.bin/pmap/main.c

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/* $NetBSD: main.c,v 1.26 2015/12/14 03:15:10 christos Exp $ */
/*
* Copyright (c) 2002, 2003 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Andrew Brown.
*
* 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.
*/
#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: main.c,v 1.26 2015/12/14 03:15:10 christos Exp $");
#endif
#include <sys/param.h>
#ifndef __NetBSD_Version__
#error go away, you fool
#elif (__NetBSD_Version__ < 105000000)
#error only works with uvm
#endif
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <limits.h>
#include <string.h>
#include <signal.h>
#include <util.h>
#include "pmap.h"
#include "main.h"
struct cache_head lcache;
struct nchashhead *nchashtbl;
void *uvm_vnodeops, *uvm_deviceops, *aobj_pager, *ubc_pager;
struct vm_map *kmem_map, *mb_map, *phys_map, *exec_map, *pager_map;
struct vm_map *st_map, *pt_map, *lkm_map, *buf_map;
u_long nchash_addr, nchashtbl_addr, kernel_map_addr;
int debug, verbose, recurse, page_size;
int print_all, print_map, print_maps, print_solaris, print_ddb;
rlim_t maxssiz;
struct nlist ksyms[] = {
{ "_maxsmap", 0, 0, 0, 0 },
#define NL_MAXSSIZ 0
{ "_uvm_vnodeops", 0, 0, 0, 0 },
#define NL_UVM_VNODEOPS 1
{ "_uvm_deviceops", 0, 0, 0, 0 },
#define NL_UVM_DEVICEOPS 2
{ "_aobj_pager", 0, 0, 0, 0 },
#define NL_AOBJ_PAGER 3
{ "_ubc_pager", 0, 0, 0, 0 },
#define NL_UBC_PAGER 4
{ "_kernel_map", 0, 0, 0, 0 },
#define NL_KERNEL_MAP 5
{ "_nchashtbl", 0, 0, 0, 0 },
#define NL_NCHASHTBL 6
{ "_nchash", 0, 0, 0, 0 },
#define NL_NCHASH 7
{ NULL, 0, 0, 0, 0 }
};
struct nlist kmaps[] = {
{ "_kmem_map", 0, 0, 0, 0 },
#define NL_kmem_map 0
{ "_mb_map", 0, 0, 0, 0 },
#define NL_mb_map 1
{ "_phys_map", 0, 0, 0, 0 },
#define NL_phys_map 2
{ "_exec_map", 0, 0, 0, 0 },
#define NL_exec_map 3
{ "_pager_map", 0, 0, 0, 0 },
#define NL_pager_map 4
{ "_st_map", 0, 0, 0, 0 },
#define NL_st_map 5
{ "_pt_map", 0, 0, 0, 0 },
#define NL_pt_map 6
{ "_lkm_map", 0, 0, 0, 0 },
#define NL_lkm_map 7
{ "_buf_map", 0, 0, 0, 0 },
#define NL_buf_map 8
{ NULL, 0, 0, 0, 0 },
};
#define VMSPACE_ADDRESS 1
#define VM_MAP_ADDRESS 2
#define VM_MAP_ENTRY_ADDRESS 3
#define AMAP_ADDRESS 4
void check_fd(int);
void load_symbols(kvm_t *);
void cache_enter(u_long, struct namecache *);
int
main(int argc, char *argv[])
{
kvm_t *kd;
pid_t pid;
uid_t uid;
int which, many, ch, rc;
char errbuf[_POSIX2_LINE_MAX + 1];
struct kinfo_proc2 *kproc;
char *kmem, *kernel, *t;
gid_t egid;
struct kbit kbit, *vmspace;
u_long address;
egid = getegid();
if (setegid(getgid()) == -1)
err(1, "failed to reset privileges");
check_fd(STDIN_FILENO);
check_fd(STDOUT_FILENO);
check_fd(STDERR_FILENO);
pid = -1;
which = verbose = debug = 0;
print_all = print_map = print_maps = print_solaris = print_ddb = 0;
recurse = 0;
kmem = kernel = NULL;
address = 0;
vmspace = &kbit;
while ((ch = getopt(argc, argv, "A:aD:dE:lM:mN:Pp:RrS:sV:vx")) != -1) {
switch (ch) {
case 'A':
case 'E':
case 'S':
case 'V':
if (which != 0)
errx(1, "use only one of -A, -E, -S, or -V");
errno = 0;
address = strtoul(optarg, &t, 0);
if (*t != '\0')
errx(1, "%s is not a valid address", optarg);
if (errno != 0)
err(1, "%s is not a valid address", optarg);
switch (ch) {
case 'A': which = AMAP_ADDRESS; break;
case 'E': which = VM_MAP_ENTRY_ADDRESS; break;
case 'S': which = VMSPACE_ADDRESS; break;
case 'V': which = VM_MAP_ADDRESS; break;
}
break;
case 'a':
print_all = 1;
break;
case 'd':
print_ddb = 1;
break;
case 'D':
errno = 0;
debug = strtoul(optarg, &t, 0);
if (*t != '\0')
errx(1, "%s is not a valid number", optarg);
if (errno != 0)
err(1, "%s is not a valid number", optarg);
break;
case 'l':
print_maps = 1;
break;
case 'm':
print_map = 1;
break;
case 'M':
kmem = optarg;
break;
case 'N':
kernel = optarg;
break;
case 'p':
errno = 0;
pid = strtol(optarg, &t, 0);
if (pid < 0)
errno = EINVAL;
if (*t != '\0')
errx(1, "%s is not a valid pid", optarg);
if (errno != 0)
err(1, "%s is not a valid pid", optarg);
break;
case 'P':
pid = getpid();
break;
case 'R':
recurse = 1;
break;
case 's':
print_solaris = 1;
break;
case 'v':
verbose++;
break;
case 'r':
case 'x':
errx(1, "-%c option not implemented, sorry", optopt);
/*NOTREACHED*/
case '?':
default:
fprintf(stderr, "usage: %s [-adlmPRsv] [-A address] "
"[-D number] [-E address] [-M core]\n"
"\t[-N system] [-p pid] [-S address] "
"[-V address] [pid ...]\n",
getprogname());
exit(1);
}
}
argc -= optind;
argv += optind;
/* more than one "process" to dump? */
many = (argc > 1 - (pid == -1 ? 0 : 1)) ? 1 : 0;
/* apply default */
if (print_all + print_map + print_maps + print_solaris +
print_ddb == 0)
print_solaris = 1;
/* get privs back if it appears to be safe, otherwise toss them */
if (kernel == NULL && kmem == NULL && address == 0)
rc = setegid(egid);
else
rc = setgid(getgid());
if (rc == -1)
err(1, "failed to reset privileges");
/* start by opening libkvm */
kd = kvm_openfiles(kernel, kmem, NULL, O_RDONLY, errbuf);
/* we're completely done with privileges now */
rc = setgid(getgid());
if (rc == -1)
err(1, "failed to reset privileges");
/* print the kvm_open error, if any */
errbuf[_POSIX2_LINE_MAX] = '\0';
if (kd == NULL)
errx(1, "%s", errbuf);
/* get "bootstrap" addresses from kernel */
load_symbols(kd);
if (address) {
struct kbit kbit2, *at = &kbit2;
memset(vmspace, 0, sizeof(*vmspace));
A(at) = address;
S(at) = (size_t)-1;
switch (which) {
case VMSPACE_ADDRESS:
/* (kd, kproc, vmspace, thing) */
(*process_map)(kd, NULL, at, "vm_map");
break;
case VM_MAP_ADDRESS:
/* (kd, proc, vmspace, vm_map, thing) */
(*dump_vm_map)(kd, NULL, vmspace, at, "vm_map");
break;
case VM_MAP_ENTRY_ADDRESS:
/* (kd, proc, vmspace, vm_map_entry, 0) */
(*dump_vm_map_entry)(kd, NULL, vmspace, at, 0);
break;
case AMAP_ADDRESS:
/* (kd, amap) */
(*dump_amap)(kd, at);
break;
}
exit(0);
}
uid = getuid();
do {
if (pid == -1) {
if (argc == 0)
pid = getppid();
else {
errno = 0;
pid = strtol(argv[0], &t, 0);
if (pid < 0)
errno = EINVAL;
if (*t != '\0')
errx(1, "%s is not a valid pid",
argv[0]);
if (errno != 0)
err(1, "%s is not a valid pid",
argv[0]);
argv++;
argc--;
}
}
errno = 0;
/* find the process id */
if (pid == 0) {
kproc = NULL;
if (uid != 0) {
/* only root can print kernel mappings */
errno = EPERM;
}
} else {
kproc = kvm_getproc2(kd, KERN_PROC_PID, pid,
sizeof(struct kinfo_proc2), &rc);
if (kproc == NULL || rc == 0) {
errno = ESRCH;
} else if (uid != 0 && uid != kproc->p_uid) {
/*
* only the real owner of the process and
* root can print process mappings
*/
errno = EPERM;
}
}
if (errno != 0) {
warn("%d", pid);
pid = -1;
continue;
}
/* dump it */
if (many) {
if (kproc != NULL)
printf("process %d:\n", kproc->p_pid);
else
printf("kernel:\n");
}
(*process_map)(kd, kproc, vmspace, NULL);
pid = -1;
} while (argc > 0);
/* done. go away. */
rc = kvm_close(kd);
if (rc == -1)
err(1, "kvm_close");
return (0);
}
void
check_fd(int fd)
{
struct stat st;
int n;
if (fstat(fd, &st) == -1) {
(void)close(fd);
n = open("/dev/null", O_RDWR);
if (n == fd || n == -1)
/* we're either done or we can do no more */
return;
/* if either of these fail, there's not much we can do */
(void)dup2(n, fd);
(void)close(n);
/* XXX should we exit if it fails? */
}
}
void
load_symbols(kvm_t *kd)
{
int rc, i, mib[2];
size_t sz;
rc = kvm_nlist(kd, &ksyms[0]);
if (rc != 0) {
for (i = 0; ksyms[i].n_name != NULL; i++)
if (ksyms[i].n_value == 0)
warnx("symbol %s: not found", ksyms[i].n_name);
exit(1);
}
uvm_vnodeops = (void*)ksyms[NL_UVM_VNODEOPS].n_value;
uvm_deviceops = (void*)ksyms[NL_UVM_DEVICEOPS].n_value;
aobj_pager = (void*)ksyms[NL_AOBJ_PAGER].n_value;
ubc_pager = (void*)ksyms[NL_UBC_PAGER].n_value;
nchash_addr = ksyms[NL_NCHASH].n_value;
_KDEREF(kd, ksyms[NL_MAXSSIZ].n_value, &maxssiz,
sizeof(maxssiz));
_KDEREF(kd, ksyms[NL_NCHASHTBL].n_value, &nchashtbl_addr,
sizeof(nchashtbl_addr));
_KDEREF(kd, ksyms[NL_KERNEL_MAP].n_value, &kernel_map_addr,
sizeof(kernel_map_addr));
/*
* Some of these may be missing from some platforms, for
* example sparc, sh3, and most powerpc platforms don't
* have a "phys_map", etc.
*/
(void)kvm_nlist(kd, &kmaps[0]);
#define get_map_address(m) do {\
if (kmaps[__CONCAT(NL_,m)].n_value != 0) \
_KDEREF(kd, kmaps[__CONCAT(NL_,m)].n_value, &m, sizeof(m)); \
} while (0/*CONSTCOND*/)
get_map_address(kmem_map);
get_map_address(mb_map);
get_map_address(phys_map);
get_map_address(exec_map);
get_map_address(pager_map);
get_map_address(st_map);
get_map_address(pt_map);
get_map_address(lkm_map);
get_map_address(buf_map);
mib[0] = CTL_HW;
mib[1] = HW_PAGESIZE;
sz = sizeof(page_size);
if (sysctl(&mib[0], 2, &page_size, &sz, NULL, 0) == -1)
err(1, "sysctl: hw.pagesize");
}
const char *
mapname(void *addr)
{
if (addr == (void*)kernel_map_addr)
return ("kernel_map");
else if (addr == kmem_map)
return ("kmem_map");
else if (addr == mb_map)
return ("mb_map");
else if (addr == phys_map)
return ("phys_map");
else if (addr == exec_map)
return ("exec_map");
else if (addr == pager_map)
return ("pager_map");
else if (addr == st_map)
return ("st_map");
else if (addr == pt_map)
return ("pt_map");
else if (addr == lkm_map)
return ("lkm_map");
else if (addr == buf_map)
return ("buf_map");
else
return (NULL);
}
void
load_name_cache(kvm_t *kd)
{
struct namecache _ncp, *ncp, *oncp;
struct nchashhead _ncpp, *ncpp;
u_long lnchash;
size_t nchash, i;
LIST_INIT(&lcache);
_KDEREF(kd, nchash_addr, &lnchash, sizeof(lnchash));
nchash = (size_t)lnchash + 1;
nchashtbl = ecalloc(nchash, sizeof(*nchashtbl));
_KDEREF(kd, nchashtbl_addr, nchashtbl, sizeof(*nchashtbl) * nchash);
ncpp = &_ncpp;
for (i = 0; i < nchash; i++) {
ncpp = &nchashtbl[i];
oncp = NULL;
LIST_FOREACH(ncp, ncpp, nc_hash) {
if (ncp == oncp ||
ncp == (void*)0xdeadbeef)
break;
oncp = ncp;
_KDEREF(kd, (u_long)ncp, &_ncp, sizeof(*ncp));
ncp = &_ncp;
if (ncp->nc_nlen > 0) {
if (ncp->nc_nlen > 2 ||
ncp->nc_name[0] != '.' ||
(ncp->nc_name[1] != '.' &&
ncp->nc_nlen != 1))
cache_enter(i, ncp);
}
}
}
}
void
cache_enter(u_long i, struct namecache *ncp)
{
struct cache_entry *ce;
if (debug & DUMP_NAMEI_CACHE)
printf("[%lu] ncp->nc_vp %10p, ncp->nc_dvp %10p, "
"ncp->nc_nlen %3d [%.*s]\n",
i, ncp->nc_vp, ncp->nc_dvp,
ncp->nc_nlen, ncp->nc_nlen, ncp->nc_name);
ce = emalloc(sizeof(struct cache_entry));
ce->ce_vp = ncp->nc_vp;
ce->ce_pvp = ncp->nc_dvp;
ce->ce_nlen = ncp->nc_nlen;
strncpy(ce->ce_name, ncp->nc_name, sizeof(ce->ce_name));
ce->ce_name[MIN(ce->ce_nlen, (int)(sizeof(ce->ce_name) - 1))] = '\0';
LIST_INSERT_HEAD(&lcache, ce, ce_next);
}
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