config_elf.c revision cb511613a15cb3949eadffd67b37d3c665b4ef22
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2008 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <limits.h>
#include <stdio.h>
#include <string.h>
#include <rtc.h>
#include <debug.h>
#include <conv.h>
#include "_rtld.h"
#include "msg.h"
static Config _config = { 0 };
Config *config = &_config;
/*
* Validate a configuration file.
*/
static void
elf_config_validate(Addr addr, Rtc_head *head, Rt_map *lmp)
{
Lm_list *lml = LIST(lmp);
const char *str, *strtbl = config->c_strtbl;
Rtc_obj *obj;
Rtc_dir *dirtbl;
Rtc_file *filetbl;
rtld_stat_t status;
int err;
/*
* If this configuration file is for a specific application make sure
* we've been invoked by the application. Note that we only check the
* basename component of the application as the original application
* and its cached equivalent are never going to have the same pathnames.
* Also, we use PATHNAME() and not NAME() - this catches things like vi
* that exec shells using execv(/usr/bin/ksh, sh ...).
*/
if (head->ch_app) {
char *_str, *_cname, *cname, *aname = PATHNAME(lmp);
obj = (Rtc_obj *)(head->ch_app + addr);
cname = _cname = (char *)(strtbl + obj->co_name);
if ((_str = strrchr(aname, '/')) != NULL)
aname = ++_str;
if ((_str = strrchr(cname, '/')) != NULL)
cname = ++_str;
if (strcmp(aname, cname)) {
/*
* It's possible a user is trying to ldd(1) an alternate
* shared object and point to a configuration file that
* the shared object is part of. In this case ignore
* any mismatch name warnings.
*/
if ((lml->lm_flags & LML_FLG_TRC_ENABLE) &&
((FLAGS1(lmp) & FL1_RT_LDDSTUB) == 0)) {
eprintf(lml, ERR_WARNING,
MSG_INTL(MSG_CONF_APP), config->c_name,
_cname);
return;
}
}
/*
* If we have a valid alternative application reset its original
* name for possible $ORIGIN processing.
*/
if ((FLAGS1(lmp) & FL1_RT_LDDSTUB) == 0) {
ORIGNAME(lmp) = _cname;
DIRSZ(lmp) = cname - _cname - 1;
}
}
/*
* If alternative objects are specified traverse the directories
* specified in the configuration file, if any directory is newer than
* the time it was recorded in the cache then continue to inspect its
* files. Any file determined newer than its configuration recording
* questions the the use of any alternative objects. The intent here
* is to make sure no-one abuses a configuration as a means of static
* linking.
*/
for (dirtbl = (Rtc_dir *)(head->ch_dir + addr);
dirtbl->cd_obj; dirtbl++) {
/*
* Skip directories that provide no files - this also catches
* RTC_OBJ_NOEXIST directories.
*/
filetbl = (Rtc_file *)(dirtbl->cd_file + addr);
if (filetbl->cf_obj == NULL)
continue;
/*
* Skip directories that haven't provided real, dumped files.
*/
obj = (Rtc_obj *)(dirtbl->cd_obj + addr);
if ((obj->co_flags & (RTC_OBJ_DUMP | RTC_OBJ_REALPTH)) !=
(RTC_OBJ_DUMP | RTC_OBJ_REALPTH))
continue;
str = strtbl + obj->co_name;
if (rtld_stat(str, &status) != 0) {
err = errno;
eprintf(lml, ERR_WARNING, MSG_INTL(MSG_CONF_DSTAT),
config->c_name, str, strerror(err));
continue;
}
if (status.st_mtime == obj->co_info)
continue;
/*
* The system directory is newer than the configuration files
* entry, start checking any dumped files.
*/
for (; filetbl->cf_obj; filetbl++) {
obj = (Rtc_obj *)(filetbl->cf_obj + addr);
str = strtbl + obj->co_name;
/*
* Skip any files that aren't real, dumped files.
*/
if ((obj->co_flags &
(RTC_OBJ_DUMP | RTC_OBJ_REALPTH)) !=
(RTC_OBJ_DUMP | RTC_OBJ_REALPTH))
continue;
if (rtld_stat(str, &status) != 0) {
err = errno;
eprintf(lml, ERR_WARNING,
MSG_INTL(MSG_CONF_FSTAT), config->c_name,
str, strerror(err));
continue;
}
/*
* If the files size is different somethings been
* changed.
*/
if (status.st_size != obj->co_info) {
eprintf(lml, ERR_WARNING,
MSG_INTL(MSG_CONF_FCMP), config->c_name,
str);
}
}
}
}
/*
* Process a configuration file.
*
* A configuration file can be specified using the LD_CONFIG environment
* variable, from a DT_CONFIG string recorded in the executable (see ld(1) -c),
* or in the case of a crle() dumped image, the file is "fabricated" to a
* configuration file that may have been associated with the dumped image. In
* the absence of any of these techniques, a default configuration file is used.
*
* The LD_CONFIG variable take precedence, unless the application is secure, in
* which case the environment variable is ignored (see ld_generic_env()).
*
* A DT_CONFIG string is honored, even if the application is secure. However,
* the path name follows the same rules as RUNPATH's, which must be a full path
* name with no use of $ORIGIN.
*/
int
elf_config(Rt_map *lmp, int aout)
{
Rtc_id *id;
Rtc_head *head;
int fd, features = 0;
rtld_stat_t status;
Addr addr;
Pnode *pnp;
const char *str;
char path[PATH_MAX];
/*
* If we're dealing with an alternative application, fabricate the need
* for a $ORIGIN/ld.config.app-name configuration file.
*/
if (rtld_flags & RT_FL_CONFAPP) {
if ((str = strrchr(PATHNAME(lmp), '/')) != NULL)
str++;
else
str = PATHNAME(lmp);
(void) snprintf(path, PATH_MAX, MSG_ORIG(MSG_ORG_CONFIG), str);
str = path;
} else
str = config->c_name;
/*
* If a configuration file name is known, expand and verify the name.
*/
if (str) {
size_t size = strlen(str);
char *estr = (char *)str;
uint_t tkns;
/*
* Expand any configuration string.
*/
if ((tkns = expand(&estr, &size, 0, 0,
(PN_TKN_ISALIST | PN_TKN_HWCAP), lmp)) == 0)
return (0);
/*
* If this is a secure application, validate the configuration
* file path name. Ignore any untrustworthy path name, and
* fall through to pick up the defaults.
*/
if ((rtld_flags & RT_FL_SECURE) &&
(is_path_secure(estr, lmp, PN_FLG_FULLPATH, tkns) == 0))
str = NULL;
else
str = (const char *)estr;
}
/*
* If a configuration file has not been specified try opening up the
* default.
*/
if (str == NULL) {
#if defined(_ELF64)
str = MSG_ORIG(MSG_PTH_CONFIG_64);
#else
str = MSG_ORIG(MSG_PTH_CONFIG);
#endif
}
config->c_name = str;
/*
* If we can't open the configuration file return silently.
*/
if ((fd = open(str, O_RDONLY, 0)) == -1)
return (DBG_CONF_PRCFAIL);
/*
* Determine the configuration file size and map the file.
*/
(void) rtld_fstat(fd, &status);
if (status.st_size < sizeof (Rtc_head)) {
(void) close(fd);
return (DBG_CONF_CORRUPT);
}
if ((addr = (Addr)mmap(0, status.st_size, PROT_READ, MAP_SHARED,
fd, 0)) == (Addr)MAP_FAILED) {
(void) close(fd);
return (DBG_CONF_PRCFAIL);
}
(void) close(fd);
/*
* If we have an Rtc_id block at the beginning, then validate it
* and advance the address to the Rtc_head. If not, then trust
* that the file is compatible with us and move ahead (there is
* some error checking for Rtc_head below as well).
*/
id = (Rtc_id *) addr;
if (RTC_ID_TEST(id)) {
addr += sizeof (*id);
status.st_size -= sizeof (*id);
if (status.st_size < sizeof (Rtc_head))
return (DBG_CONF_CORRUPT);
if ((id->id_class != M_CLASS) || (id->id_data != M_DATA) ||
(id->id_machine != M_MACH))
return (DBG_CONF_ABIMISMATCH);
}
config->c_bgn = addr;
config->c_end = addr + status.st_size;
head = (Rtc_head *)addr;
/*
* Make sure we can handle this version of the configuration file.
*/
if (head->ch_version > RTC_VER_CURRENT)
return (DBG_CONF_VERSION);
/*
* When crle(1) creates a temporary configuration file the
* RTC_HDR_IGNORE flag is set. Thus the mapping of the configuration
* file is taken into account but not its content.
*/
if (head->ch_cnflags & RTC_HDR_IGNORE)
return (DBG_CONF_IGNORE);
/*
* Apply any new default library pathname.
*/
if (head->ch_edlibpath) {
str = (const char *)(head->ch_edlibpath + addr);
#ifndef SGS_PRE_UNIFIED_PROCESS
if ((head->ch_cnflags & RTC_HDR_UPM) == 0) {
#if defined(_ELF64)
str = conv_config_upm(str, MSG_ORIG(MSG_PTH_USRLIB_64),
MSG_ORIG(MSG_PTH_LIB_64), MSG_PTH_LIB_64_SIZE);
#else
str = conv_config_upm(str, MSG_ORIG(MSG_PTH_USRLIB),
MSG_ORIG(MSG_PTH_LIB), MSG_PTH_LIB_SIZE);
#endif
}
#endif
if ((pnp = expand_paths(lmp, str,
(LA_SER_DEFAULT | LA_SER_CONFIG), PN_TKN_HWCAP)) != 0)
elf_fct.fct_dflt_dirs = pnp;
features |= CONF_EDLIBPATH;
}
if (head->ch_eslibpath) {
str = (const char *)(head->ch_eslibpath + addr);
#ifndef SGS_PRE_UNIFIED_PROCESS
if ((head->ch_cnflags & RTC_HDR_UPM) == 0) {
#if defined(_ELF64)
str = conv_config_upm(str,
MSG_ORIG(MSG_PTH_USRLIBSE_64),
MSG_ORIG(MSG_PTH_LIBSE_64), MSG_PTH_LIBSE_64_SIZE);
#else
str = conv_config_upm(str, MSG_ORIG(MSG_PTH_USRLIBSE),
MSG_ORIG(MSG_PTH_LIBSE), MSG_PTH_LIBSE_SIZE);
#endif
}
#endif
if ((pnp = expand_paths(lmp, str,
(LA_SER_SECURE | LA_SER_CONFIG), PN_TKN_HWCAP)) != 0)
elf_fct.fct_secure_dirs = pnp;
features |= CONF_ESLIBPATH;
}
#if defined(__sparc) && !defined(_ELF64)
if (head->ch_adlibpath) {
str = (const char *)(head->ch_adlibpath + addr);
if ((pnp = expand_paths(lmp, str,
(LA_SER_DEFAULT | LA_SER_CONFIG), PN_TKN_HWCAP)) != 0)
aout_fct.fct_dflt_dirs = pnp;
features |= CONF_ADLIBPATH;
}
if (head->ch_aslibpath) {
str = (const char *)(head->ch_aslibpath + addr);
if ((pnp = expand_paths(lmp, str,
(LA_SER_SECURE | LA_SER_CONFIG), PN_TKN_HWCAP)) != 0)
aout_fct.fct_secure_dirs = pnp;
features |= CONF_ASLIBPATH;
}
#endif
/*
* Apply any environment variables. This attribute was added with
* RTC_VER_THREE.
*/
if ((head->ch_version >= RTC_VER_THREE) && head->ch_env &&
(!(rtld_flags & RT_FL_NOENVCFG))) {
if (readenv_config((Rtc_env *)(head->ch_env + addr),
addr, aout) != 0)
return (-1);
features |= CONF_ENVS;
}
/*
* Determine whether filter/filtee associations are available.
*/
if ((head->ch_version >= RTC_VER_FOUR) && head->ch_fltr &&
(!(rtld_flags2 & RT_FL2_NOFLTCFG))) {
rtld_flags2 |= RT_FL2_FLTCFG;
config->c_fltr = (Rtc_fltr *)(head->ch_fltr + addr);
config->c_flte = (Rtc_flte *)(head->ch_flte + addr);
features |= CONF_FLTR;
}
/*
* Determine whether directory configuration is available.
*/
if ((!(rtld_flags & RT_FL_NODIRCFG)) && head->ch_hash) {
config->c_hashtbl = (Word *)(head->ch_hash + addr);
config->c_hashchain = &config->c_hashtbl[2 +
config->c_hashtbl[0]];
config->c_objtbl = (Rtc_obj *)(head->ch_obj + addr);
config->c_strtbl = (const char *)(head->ch_str + addr);
rtld_flags |= RT_FL_DIRCFG;
features |= CONF_DIRCFG;
}
/*
* Determine whether alternative objects are specified or an object
* reservation area is required. If the reservation can't be completed
* (either because the configuration information is out-of-date, or the
* the reservation can't be allocated), then alternative objects are
* ignored.
*/
if ((!(rtld_flags & (RT_FL_NODIRCFG | RT_FL_NOOBJALT))) &&
(head->ch_cnflags & RTC_HDR_ALTER)) {
rtld_flags |= RT_FL_OBJALT;
features |= CONF_OBJALT;
elf_config_validate(addr, head, lmp);
if (head->ch_resbgn) {
if (((config->c_bgn <= head->ch_resbgn) &&
(config->c_bgn >= head->ch_resend)) ||
(nu_map(LIST(lmp),
(caddr_t)(uintptr_t)head->ch_resbgn,
(head->ch_resend - head->ch_resbgn), PROT_NONE,
MAP_FIXED | MAP_PRIVATE) == MAP_FAILED))
return (-1);
rtld_flags |= RT_FL_MEMRESV;
features |= CONF_MEMRESV;
}
}
return (features);
}
/*
* Determine whether the given file exists in the configuration file.
*/
Rtc_obj *
elf_config_ent(const char *name, Word hash, int id, const char **alternate)
{
Word bkt, ndx;
const char *str;
Rtc_obj *obj;
bkt = hash % config->c_hashtbl[0];
ndx = config->c_hashtbl[2 + bkt];
while (ndx) {
obj = config->c_objtbl + ndx;
str = config->c_strtbl + obj->co_name;
if ((obj->co_hash != hash) || (strcmp(name, str) != 0) ||
(id && (id != obj->co_id))) {
ndx = config->c_hashchain[ndx];
continue;
}
if ((obj->co_flags & RTC_OBJ_ALTER) && alternate)
*alternate = config->c_strtbl + obj->co_alter;
return (obj);
}
return (0);
}
/*
* Determine whether a filter and filtee string pair exists in the configuration
* file. If so, return the cached filtees that are associated with this pair as
* a Pnode list.
*/
Pnode *
elf_config_flt(Lm_list *lml, const char *filter, const char *string)
{
Rtc_fltr *fltrtbl;
Pnode *pnp = NULL, *npnp, *opnp = NULL;
for (fltrtbl = (Rtc_fltr *)config->c_fltr; fltrtbl->fr_filter;
fltrtbl++) {
Rtc_flte *fltetbl;
const char *fltr, *str;
fltr = config->c_strtbl + fltrtbl->fr_filter;
str = config->c_strtbl + fltrtbl->fr_string;
if (strcmp(filter, fltr) || strcmp(string, str))
continue;
/*
* Create a pnode list for each filtee associated with this
* filter/filtee string pair. Note, no expansion of filtee
* entries is called for, as any original expansion would have
* been carried out before they were recorded in the
* configuration file.
*/
/* LINTED */
for (fltetbl = (Rtc_flte *)((char *)config->c_flte +
fltrtbl->fr_filtee); fltetbl->fe_filtee; fltetbl++) {
const char *flte;
flte = config->c_strtbl + fltetbl->fe_filtee;
if (((npnp = calloc(1, sizeof (Pnode))) == NULL) ||
((npnp->p_name = strdup(flte)) == NULL))
return (0);
DBG_CALL(Dbg_file_filter(lml, fltr, flte, 1));
if (opnp == NULL)
pnp = npnp;
else
opnp->p_next = npnp;
npnp->p_len = strlen(flte) + 1;
npnp->p_orig = LA_SER_CONFIG;
opnp = npnp;
}
return (pnp);
}
return (0);
}