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freebsd-dev/usr.sbin/kldxref/kldxref.c
Warner Losh ee150a3376 Use EF_SEG_READ_STRING instead of EF_SEG_READ when reading strings. 
Normally, we can get away with just reading the 1k buffer for the
string, since the placement of the data is generally no where near the
end of the file. However, it's possible that the string is within the
last 1k of the file, in which case the read will fail, and we'll not
produce the proper records needed for devmatch to work. By reading
using EF_SEG_READ_STRING, we automatically work around these problems
while still retaining safety.

This fix a problem with devmatch where we wouldn't load certain
modules (like ums). This didn't always happen (my tree didn't exhibit
it, while nathan's did because his optimization options were more
agressive).

Reported by: nathanw@
2018-07-15 05:29:39 +00:00

725 lines
19 KiB
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/*-
* SPDX-License-Identifier: BSD-4-Clause
*
* Copyright (c) 2000, Boris Popov
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Boris Popov.
* 4. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*
* $FreeBSD$
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/endian.h>
#include <sys/exec.h>
#include <sys/queue.h>
#include <sys/kernel.h>
#include <sys/reboot.h>
#include <sys/linker.h>
#include <sys/stat.h>
#include <sys/module.h>
#define FREEBSD_ELF
#include <err.h>
#include <errno.h>
#include <fts.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <machine/elf.h>
#include "ef.h"
#define MAXRECSIZE (64 << 10) /* 64k */
#define check(val) if ((error = (val)) != 0) break
static bool dflag; /* do not create a hint file, only write on stdout */
static int verbose;
static FILE *fxref; /* current hints file */
static const char *xref_file = "linker.hints";
/*
* A record is stored in the static buffer recbuf before going to disk.
*/
static char recbuf[MAXRECSIZE];
static int recpos; /* current write position */
static int reccnt; /* total record written to this file so far */
static void
intalign(void)
{
recpos = roundup2(recpos, sizeof(int));
}
static void
record_start(void)
{
recpos = 0;
memset(recbuf, 0, MAXRECSIZE);
}
static int
record_end(void)
{
if (recpos == 0)
return (0);
reccnt++;
intalign();
fwrite(&recpos, sizeof(recpos), 1, fxref);
return (fwrite(recbuf, recpos, 1, fxref) != 1 ? errno : 0);
}
static int
record_buf(const void *buf, size_t size)
{
if (MAXRECSIZE - recpos < size)
errx(1, "record buffer overflow");
memcpy(recbuf + recpos, buf, size);
recpos += size;
return (0);
}
/*
* An int is stored in host order and aligned
*/
static int
record_int(int val)
{
intalign();
return (record_buf(&val, sizeof(val)));
}
/*
* A string is stored as 1-byte length plus data, no padding
*/
static int
record_string(const char *str)
{
int error;
size_t len;
u_char val;
if (dflag)
return (0);
val = len = strlen(str);
if (len > 255)
errx(1, "string %s too long", str);
error = record_buf(&val, sizeof(val));
if (error != 0)
return (error);
return (record_buf(str, len));
}
/* From sys/isa/pnp.c */
static char *
pnp_eisaformat(uint32_t id)
{
uint8_t *data;
static char idbuf[8];
const char hextoascii[] = "0123456789abcdef";
id = htole32(id);
data = (uint8_t *)&id;
idbuf[0] = '@' + ((data[0] & 0x7c) >> 2);
idbuf[1] = '@' + (((data[0] & 0x3) << 3) + ((data[1] & 0xe0) >> 5));
idbuf[2] = '@' + (data[1] & 0x1f);
idbuf[3] = hextoascii[(data[2] >> 4)];
idbuf[4] = hextoascii[(data[2] & 0xf)];
idbuf[5] = hextoascii[(data[3] >> 4)];
idbuf[6] = hextoascii[(data[3] & 0xf)];
idbuf[7] = 0;
return (idbuf);
}
struct pnp_elt
{
int pe_kind; /* What kind of entry */
#define TYPE_SZ_MASK 0x0f
#define TYPE_FLAGGED 0x10 /* all f's is a wildcard */
#define TYPE_INT 0x20 /* Is a number */
#define TYPE_PAIRED 0x40
#define TYPE_LE 0x80 /* Matches <= this value */
#define TYPE_GE 0x100 /* Matches >= this value */
#define TYPE_MASK 0x200 /* Specifies a mask to follow */
#define TYPE_U8 (1 | TYPE_INT)
#define TYPE_V8 (1 | TYPE_INT | TYPE_FLAGGED)
#define TYPE_G16 (2 | TYPE_INT | TYPE_GE)
#define TYPE_L16 (2 | TYPE_INT | TYPE_LE)
#define TYPE_M16 (2 | TYPE_INT | TYPE_MASK)
#define TYPE_U16 (2 | TYPE_INT)
#define TYPE_V16 (2 | TYPE_INT | TYPE_FLAGGED)
#define TYPE_U32 (4 | TYPE_INT)
#define TYPE_V32 (4 | TYPE_INT | TYPE_FLAGGED)
#define TYPE_W32 (4 | TYPE_INT | TYPE_PAIRED)
#define TYPE_D 7
#define TYPE_Z 8
#define TYPE_P 9
#define TYPE_E 10
#define TYPE_T 11
int pe_offset; /* Offset within the element */
char * pe_key; /* pnp key name */
TAILQ_ENTRY(pnp_elt) next; /* Link */
};
typedef TAILQ_HEAD(pnp_head, pnp_elt) pnp_list;
/*
* this function finds the data from the pnp table, as described by the
* the description and creates a new output (new_desc). This output table
* is a form that's easier for the agent that's automatically loading the
* modules.
*
* The format output is the simplified string from this routine in the
* same basic format as the pnp string, as documented in sys/module.h.
* First a string describing the format is output, the a count of the
* number of records, then each record. The format string also describes
* the length of each entry (though it isn't a fixed length when strings
* are present).
*
* type Output Meaning
* I uint32_t Integer equality comparison
* J uint32_t Pair of uint16_t fields converted to native
* byte order. The two fields both must match.
* G uint32_t Greater than or equal to
* L uint32_t Less than or equal to
* M uint32_t Mask of which fields to test. Fields that
* take up space increment the count. This
* field must be first, and resets the count.
* D string Description of the device this pnp info is for
* Z string pnp string must match this
* T nothing T fields set pnp values that must be true for
* the entire table.
* Values are packed the same way that other values are packed in this file.
* Strings and int32_t's start on a 32-bit boundary and are padded with 0
* bytes. Objects that are smaller than uint32_t are converted, without
* sign extension to uint32_t to simplify parsing downstream.
*/
static int
parse_pnp_list(const char *desc, char **new_desc, pnp_list *list)
{
const char *walker, *ep;
const char *colon, *semi;
struct pnp_elt *elt;
char *nd;
char type[8], key[32];
int off;
walker = desc;
ep = desc + strlen(desc);
off = 0;
nd = *new_desc = malloc(strlen(desc) + 1);
if (verbose > 1)
printf("Converting %s into a list\n", desc);
while (walker < ep) {
colon = strchr(walker, ':');
semi = strchr(walker, ';');
if (semi != NULL && semi < colon)
goto err;
if (colon - walker > sizeof(type))
goto err;
strncpy(type, walker, colon - walker);
type[colon - walker] = '\0';
if (semi != NULL) {
if (semi - colon >= sizeof(key))
goto err;
strncpy(key, colon + 1, semi - colon - 1);
key[semi - colon - 1] = '\0';
walker = semi + 1;
} else {
if (strlen(colon + 1) >= sizeof(key))
goto err;
strcpy(key, colon + 1);
walker = ep;
}
if (verbose > 1)
printf("Found type %s for name %s\n", type, key);
/* Skip pointer place holders */
if (strcmp(type, "P") == 0) {
off += sizeof(void *);
continue;
}
/*
* Add a node of the appropriate type
*/
elt = malloc(sizeof(struct pnp_elt) + strlen(key) + 1);
TAILQ_INSERT_TAIL(list, elt, next);
elt->pe_key = (char *)(elt + 1);
elt->pe_offset = off;
if (strcmp(type, "U8") == 0)
elt->pe_kind = TYPE_U8;
else if (strcmp(type, "V8") == 0)
elt->pe_kind = TYPE_V8;
else if (strcmp(type, "G16") == 0)
elt->pe_kind = TYPE_G16;
else if (strcmp(type, "L16") == 0)
elt->pe_kind = TYPE_L16;
else if (strcmp(type, "M16") == 0)
elt->pe_kind = TYPE_M16;
else if (strcmp(type, "U16") == 0)
elt->pe_kind = TYPE_U16;
else if (strcmp(type, "V16") == 0)
elt->pe_kind = TYPE_V16;
else if (strcmp(type, "U32") == 0)
elt->pe_kind = TYPE_U32;
else if (strcmp(type, "V32") == 0)
elt->pe_kind = TYPE_V32;
else if (strcmp(type, "W32") == 0)
elt->pe_kind = TYPE_W32;
else if (strcmp(type, "D") == 0) /* description char * */
elt->pe_kind = TYPE_D;
else if (strcmp(type, "Z") == 0) /* char * to match */
elt->pe_kind = TYPE_Z;
else if (strcmp(type, "P") == 0) /* Pointer -- ignored */
elt->pe_kind = TYPE_P;
else if (strcmp(type, "E") == 0) /* EISA PNP ID, as uint32_t */
elt->pe_kind = TYPE_E;
else if (strcmp(type, "T") == 0)
elt->pe_kind = TYPE_T;
else
goto err;
/*
* Maybe the rounding here needs to be more nuanced and/or somehow
* architecture specific. Fortunately, most tables in the system
* have sane ordering of types.
*/
if (elt->pe_kind & TYPE_INT) {
elt->pe_offset = roundup2(elt->pe_offset, elt->pe_kind & TYPE_SZ_MASK);
off = elt->pe_offset + (elt->pe_kind & TYPE_SZ_MASK);
} else if (elt->pe_kind == TYPE_E) {
/* Type E stored as Int, displays as string */
elt->pe_offset = roundup2(elt->pe_offset, sizeof(uint32_t));
off = elt->pe_offset + sizeof(uint32_t);
} else if (elt->pe_kind == TYPE_T) {
/* doesn't actually consume space in the table */
off = elt->pe_offset;
} else {
elt->pe_offset = roundup2(elt->pe_offset, sizeof(void *));
off = elt->pe_offset + sizeof(void *);
}
if (elt->pe_kind & TYPE_PAIRED) {
char *word, *ctx;
for (word = strtok_r(key, "/", &ctx);
word; word = strtok_r(NULL, "/", &ctx)) {
sprintf(nd, "%c:%s;", elt->pe_kind & TYPE_FLAGGED ? 'J' : 'I',
word);
nd += strlen(nd);
}
}
else {
if (elt->pe_kind & TYPE_FLAGGED)
*nd++ = 'J';
else if (elt->pe_kind & TYPE_GE)
*nd++ = 'G';
else if (elt->pe_kind & TYPE_LE)
*nd++ = 'L';
else if (elt->pe_kind & TYPE_MASK)
*nd++ = 'M';
else if (elt->pe_kind & TYPE_INT)
*nd++ = 'I';
else if (elt->pe_kind == TYPE_D)
*nd++ = 'D';
else if (elt->pe_kind == TYPE_Z || elt->pe_kind == TYPE_E)
*nd++ = 'Z';
else if (elt->pe_kind == TYPE_T)
*nd++ = 'T';
else
errx(1, "Impossible type %x\n", elt->pe_kind);
*nd++ = ':';
strcpy(nd, key);
nd += strlen(nd);
*nd++ = ';';
}
}
*nd++ = '\0';
return (0);
err:
errx(1, "Parse error of description string %s", desc);
}
static int
parse_entry(struct mod_metadata *md, const char *cval,
struct elf_file *ef, const char *kldname)
{
struct mod_depend mdp;
struct mod_version mdv;
struct mod_pnp_match_info pnp;
char descr[1024];
Elf_Off data;
int error, i;
size_t len;
char *walker;
void *table;
data = (Elf_Off)md->md_data;
error = 0;
record_start();
switch (md->md_type) {
case MDT_DEPEND:
if (!dflag)
break;
check(EF_SEG_READ(ef, data, sizeof(mdp), &mdp));
printf(" depends on %s.%d (%d,%d)\n", cval,
mdp.md_ver_preferred, mdp.md_ver_minimum, mdp.md_ver_maximum);
break;
case MDT_VERSION:
check(EF_SEG_READ(ef, data, sizeof(mdv), &mdv));
if (dflag) {
printf(" interface %s.%d\n", cval, mdv.mv_version);
} else {
record_int(MDT_VERSION);
record_string(cval);
record_int(mdv.mv_version);
record_string(kldname);
}
break;
case MDT_MODULE:
if (dflag) {
printf(" module %s\n", cval);
} else {
record_int(MDT_MODULE);
record_string(cval);
record_string(kldname);
}
break;
case MDT_PNP_INFO:
check(EF_SEG_READ_REL(ef, data, sizeof(pnp), &pnp));
check(EF_SEG_READ_STRING(ef, (Elf_Off)pnp.descr, sizeof(descr), descr));
descr[sizeof(descr) - 1] = '\0';
if (dflag) {
printf(" pnp info for bus %s format %s %d entries of %d bytes\n",
cval, descr, pnp.num_entry, pnp.entry_len);
} else {
pnp_list list;
struct pnp_elt *elt, *elt_tmp;
char *new_descr;
if (verbose > 1)
printf(" pnp info for bus %s format %s %d entries of %d bytes\n",
cval, descr, pnp.num_entry, pnp.entry_len);
/*
* Parse descr to weed out the chaff and to create a list
* of offsets to output.
*/
TAILQ_INIT(&list);
parse_pnp_list(descr, &new_descr, &list);
record_int(MDT_PNP_INFO);
record_string(cval);
record_string(new_descr);
record_int(pnp.num_entry);
len = pnp.num_entry * pnp.entry_len;
walker = table = malloc(len);
check(EF_SEG_READ_REL(ef, (Elf_Off)pnp.table, len, table));
/*
* Walk the list and output things. We've collapsed all the
* variant forms of the table down to just ints and strings.
*/
for (i = 0; i < pnp.num_entry; i++) {
TAILQ_FOREACH(elt, &list, next) {
uint8_t v1;
uint16_t v2;
uint32_t v4;
int value;
char buffer[1024];
if (elt->pe_kind == TYPE_W32) {
memcpy(&v4, walker + elt->pe_offset, sizeof(v4));
value = v4 & 0xffff;
record_int(value);
if (verbose > 1)
printf("W32:%#x", value);
value = (v4 >> 16) & 0xffff;
record_int(value);
if (verbose > 1)
printf(":%#x;", value);
} else if (elt->pe_kind & TYPE_INT) {
switch (elt->pe_kind & TYPE_SZ_MASK) {
case 1:
memcpy(&v1, walker + elt->pe_offset, sizeof(v1));
if ((elt->pe_kind & TYPE_FLAGGED) && v1 == 0xff)
value = -1;
else
value = v1;
break;
case 2:
memcpy(&v2, walker + elt->pe_offset, sizeof(v2));
if ((elt->pe_kind & TYPE_FLAGGED) && v2 == 0xffff)
value = -1;
else
value = v2;
break;
case 4:
memcpy(&v4, walker + elt->pe_offset, sizeof(v4));
if ((elt->pe_kind & TYPE_FLAGGED) && v4 == 0xffffffff)
value = -1;
else
value = v4;
break;
default:
errx(1, "Invalid size somehow %#x", elt->pe_kind);
}
if (verbose > 1)
printf("I:%#x;", value);
record_int(value);
} else if (elt->pe_kind == TYPE_T) {
/* Do nothing */
} else { /* E, Z or D -- P already filtered */
if (elt->pe_kind == TYPE_E) {
memcpy(&v4, walker + elt->pe_offset, sizeof(v4));
strcpy(buffer, pnp_eisaformat(v4));
} else {
char *ptr;
ptr = *(char **)(walker + elt->pe_offset);
buffer[0] = '\0';
if (ptr != NULL) {
EF_SEG_READ_STRING(ef, (Elf_Off)ptr,
sizeof(buffer), buffer);
buffer[sizeof(buffer) - 1] = '\0';
}
}
if (verbose > 1)
printf("%c:%s;", elt->pe_kind == TYPE_E ? 'E' : (elt->pe_kind == TYPE_Z ? 'Z' : 'D'), buffer);
record_string(buffer);
}
}
if (verbose > 1)
printf("\n");
walker += pnp.entry_len;
}
/* Now free it */
TAILQ_FOREACH_SAFE(elt, &list, next, elt_tmp) {
TAILQ_REMOVE(&list, elt, next);
free(elt);
}
free(table);
}
break;
default:
warnx("unknown metadata record %d in file %s", md->md_type, kldname);
}
if (!error)
record_end();
return (error);
}
static int
read_kld(char *filename, char *kldname)
{
struct mod_metadata md;
struct elf_file ef;
void **p, **orgp;
int error, eftype;
long start, finish, entries;
char cval[MAXMODNAME + 1];
if (verbose || dflag)
printf("%s\n", filename);
error = ef_open(filename, &ef, verbose);
if (error != 0) {
error = ef_obj_open(filename, &ef, verbose);
if (error != 0) {
if (verbose)
warnc(error, "elf_open(%s)", filename);
return (error);
}
}
eftype = EF_GET_TYPE(&ef);
if (eftype != EFT_KLD && eftype != EFT_KERNEL) {
EF_CLOSE(&ef);
return (0);
}
do {
check(EF_LOOKUP_SET(&ef, MDT_SETNAME, &start, &finish,
&entries));
check(EF_SEG_READ_ENTRY_REL(&ef, start, sizeof(*p) * entries,
(void *)&p));
orgp = p;
while(entries--) {
check(EF_SEG_READ_REL(&ef, (Elf_Off)*p, sizeof(md),
&md));
p++;
check(EF_SEG_READ_STRING(&ef, (Elf_Off)md.md_cval,
sizeof(cval), cval));
parse_entry(&md, cval, &ef, kldname);
}
if (error != 0)
warnc(error, "error while reading %s", filename);
free(orgp);
} while(0);
EF_CLOSE(&ef);
return (error);
}
/*
* Create a temp file in directory root, make sure we don't
* overflow the buffer for the destination name
*/
static FILE *
maketempfile(char *dest, const char *root)
{
char *p;
int n, fd;
p = strrchr(root, '/');
n = p != NULL ? p - root + 1 : 0;
if (snprintf(dest, MAXPATHLEN, "%.*slhint.XXXXXX", n, root) >=
MAXPATHLEN) {
errno = ENAMETOOLONG;
return (NULL);
}
fd = mkstemp(dest);
if (fd < 0)
return (NULL);
fchmod(fd, 0644); /* nothing secret in the file */
return (fdopen(fd, "w+"));
}
static char xrefname[MAXPATHLEN], tempname[MAXPATHLEN];
static void
usage(void)
{
fprintf(stderr, "%s\n",
"usage: kldxref [-Rdv] [-f hintsfile] path ..."
);
exit(1);
}
static int
compare(const FTSENT *const *a, const FTSENT *const *b)
{
if ((*a)->fts_info == FTS_D && (*b)->fts_info != FTS_D)
return (1);
if ((*a)->fts_info != FTS_D && (*b)->fts_info == FTS_D)
return (-1);
return (strcmp((*a)->fts_name, (*b)->fts_name));
}
int
main(int argc, char *argv[])
{
FTS *ftsp;
FTSENT *p;
int opt, fts_options, ival;
struct stat sb;
fts_options = FTS_PHYSICAL;
while ((opt = getopt(argc, argv, "Rdf:v")) != -1) {
switch (opt) {
case 'd': /* no hint file, only print on stdout */
dflag = true;
break;
case 'f': /* use this name instead of linker.hints */
xref_file = optarg;
break;
case 'v':
verbose++;
break;
case 'R': /* recurse on directories */
fts_options |= FTS_COMFOLLOW;
break;
default:
usage();
/* NOTREACHED */
}
}
if (argc - optind < 1)
usage();
argc -= optind;
argv += optind;
if (stat(argv[0], &sb) != 0)
err(1, "%s", argv[0]);
if ((sb.st_mode & S_IFDIR) == 0) {
errno = ENOTDIR;
err(1, "%s", argv[0]);
}
ftsp = fts_open(argv, fts_options, compare);
if (ftsp == NULL)
exit(1);
for (;;) {
p = fts_read(ftsp);
if ((p == NULL || p->fts_info == FTS_D) && fxref) {
/* close and rename the current hint file */
fclose(fxref);
fxref = NULL;
if (reccnt != 0) {
rename(tempname, xrefname);
} else {
/* didn't find any entry, ignore this file */
unlink(tempname);
unlink(xrefname);
}
}
if (p == NULL)
break;
if (p->fts_info == FTS_D && !dflag) {
/* visiting a new directory, create a new hint file */
snprintf(xrefname, sizeof(xrefname), "%s/%s",
ftsp->fts_path, xref_file);
fxref = maketempfile(tempname, ftsp->fts_path);
if (fxref == NULL)
err(1, "can't create %s", tempname);
ival = 1;
fwrite(&ival, sizeof(ival), 1, fxref);
reccnt = 0;
}
/* skip non-files and separate debug files */
if (p->fts_info != FTS_F)
continue;
if (p->fts_namelen >= 6 &&
strcmp(p->fts_name + p->fts_namelen - 6, ".debug") == 0)
continue;
if (p->fts_namelen >= 8 &&
strcmp(p->fts_name + p->fts_namelen - 8, ".symbols") == 0)
continue;
read_kld(p->fts_path, p->fts_name);
}
fts_close(ftsp);
return (0);
}
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