OpenSolaris_b135/cmd/sgs/rtld/common/audit.c
/*
* 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 2010 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*
* Audit interfaces. Auditing can be enabled in two ways:
*
* o Using the LD_AUDIT environment variable
*
* o From individual objects containing a DT_DEPAUDIT entry
* (see ld(1) -P/-p options).
*
* The former establishes a global set of audit libraries which can inspect all
* objects from a given process. The latter establishes a local set of audit
* libraries which can inspect the immediate dependencies of the caller.
*
* Audit library capabilities are indicated by flags within the link-map list
* header (for global auditing), see LML_TFLG_AUD_* flags, or by the same flags
* within the individual link-map (for local auditing). Although both sets of
* flags can occur in different data items they are defined as one to simplify
* audit interface requirements. The basic test for all audit interfaces is:
*
* if (((lml->lm_tflags | AFLAGS(lmp)) & LML_TFLG_AUD_MASK) &&
* (lml == LIST(lmp)))
*
* The latter link-map list equivalence test insures that auditors themselves
* (invoked through DT_DEPAUDIT) are not audited.
*/
#include <stdio.h>
#include <sys/types.h>
#include <sys/lwp.h>
#include <stdio.h>
#include <stdarg.h>
#include <dlfcn.h>
#include <string.h>
#include <debug.h>
#include "_rtld.h"
#include "_audit.h"
#include "_elf.h"
#include "msg.h"
uint_t audit_flags = 0; /* Copy of specific audit flags to */
/* simplify boot_elf.s access. */
static Audit_client *
_audit_client(Audit_info *aip, Rt_map *almp)
{
int ndx;
if (aip == NULL)
return (NULL);
for (ndx = 0; ndx < aip->ai_cnt; ndx++) {
if (aip->ai_clients[ndx].ac_lmp == almp)
return (&(aip->ai_clients[ndx]));
}
return (NULL);
}
/*
* la_filter() caller. Traverse through all audit libraries and call any
* la_filter() entry points found. A zero return from an auditor indicates
* that the filtee should be ignored.
*/
static int
_audit_objfilter(APlist *list, Rt_map *frlmp, const char *ref, Rt_map *felmp,
uint_t flags)
{
Audit_list *alp;
Aliste idx;
for (APLIST_TRAVERSE(list, idx, alp)) {
Audit_client *fracp, *feacp;
if (alp->al_objfilter == NULL)
continue;
if ((fracp = _audit_client(AUDINFO(frlmp),
alp->al_lmp)) == NULL)
continue;
if ((feacp = _audit_client(AUDINFO(felmp),
alp->al_lmp)) == NULL)
continue;
leave(LIST(alp->al_lmp), thr_flg_reenter);
if ((*alp->al_objfilter)(&(fracp->ac_cookie), ref,
&(feacp->ac_cookie), flags) == 0)
return (0);
(void) enter(thr_flg_reenter);
}
return (1);
}
int
audit_objfilter(Rt_map *frlmp, const char *ref, Rt_map *felmp, uint_t flags)
{
int appl = 0, respond = 1;
if (rt_critical())
return (respond);
if ((rtld_flags & RT_FL_APPLIC) == 0)
appl = rtld_flags |= RT_FL_APPLIC;
if (auditors && (auditors->ad_flags & LML_TFLG_AUD_OBJFILTER))
respond = _audit_objfilter(auditors->ad_list, frlmp,
ref, felmp, flags);
if (respond && AUDITORS(frlmp) &&
(AUDITORS(frlmp)->ad_flags & LML_TFLG_AUD_OBJFILTER))
respond = _audit_objfilter(AUDITORS(frlmp)->ad_list, frlmp,
ref, felmp, flags);
if (appl)
rtld_flags &= ~RT_FL_APPLIC;
return (respond);
}
/*
* la_objsearch() caller. Traverse through all audit libraries and call any
* la_objsearch() entry points found.
*
* Effectively any audit library can change the name we're working with, so we
* continue to propagate the new name to each audit library. Any 0 return
* terminates the search.
*/
static char *
_audit_objsearch(APlist *list, char *name, Rt_map *clmp, uint_t flags)
{
Audit_list *alp;
Aliste idx;
char *nname = (char *)name;
for (APLIST_TRAVERSE(list, idx, alp)) {
Audit_client *acp;
if (alp->al_objsearch == NULL)
continue;
if ((acp = _audit_client(AUDINFO(clmp), alp->al_lmp)) == NULL)
continue;
leave(LIST(alp->al_lmp), thr_flg_reenter);
nname = (*alp->al_objsearch)(nname, &(acp->ac_cookie), flags);
(void) enter(thr_flg_reenter);
if (nname == NULL)
break;
}
return (nname);
}
char *
audit_objsearch(Rt_map *clmp, const char *name, uint_t flags)
{
char *nname = (char *)name;
int appl = 0;
if (rt_critical())
return (nname);
if ((rtld_flags & RT_FL_APPLIC) == 0)
appl = rtld_flags |= RT_FL_APPLIC;
if (auditors && (auditors->ad_flags & LML_TFLG_AUD_OBJSEARCH))
nname = _audit_objsearch(auditors->ad_list, nname,
clmp, flags);
if (nname && AUDITORS(clmp) &&
(AUDITORS(clmp)->ad_flags & LML_TFLG_AUD_OBJSEARCH))
nname = _audit_objsearch(AUDITORS(clmp)->ad_list, nname,
clmp, flags);
if (appl)
rtld_flags &= ~RT_FL_APPLIC;
DBG_CALL(Dbg_libs_audit(LIST(clmp), name, nname));
return (nname);
}
/*
* la_activity() caller. Traverse through all audit libraries and call any
* la_activity() entry points found.
*/
static void
_audit_activity(APlist *list, Rt_map *clmp, uint_t flags)
{
Audit_list *alp;
Aliste idx;
Lm_list *clml = LIST(clmp);
for (APLIST_TRAVERSE(list, idx, alp)) {
Audit_client *acp;
Rt_map *almp = alp->al_lmp;
Lm_list *alml = LIST(almp);
if (alp->al_activity == 0)
continue;
if ((acp = _audit_client(AUDINFO(clmp), alp->al_lmp)) == NULL)
continue;
/*
* Make sure the audit library only sees one addition/deletion
* at a time. This ensures the library doesn't see numerous
* events from lazy loading a series of libraries. Keep track
* of this caller having called an auditor, so that the
* appropriate "consistent" event can be supplied on leaving
* ld.so.1.
*/
if ((flags == LA_ACT_ADD) || (flags == LA_ACT_DELETE)) {
if (alml->lm_flags & LML_FLG_AUDITNOTIFY)
continue;
if (aplist_append(&clml->lm_actaudit, clmp,
AL_CNT_ACTAUDIT) == NULL)
return;
alml->lm_flags |= LML_FLG_AUDITNOTIFY;
} else {
if ((alml->lm_flags & LML_FLG_AUDITNOTIFY) == 0)
continue;
alml->lm_flags &= ~LML_FLG_AUDITNOTIFY;
}
leave(LIST(alp->al_lmp), thr_flg_reenter);
(*alp->al_activity)(&(acp->ac_cookie), flags);
(void) enter(thr_flg_reenter);
}
}
void
audit_activity(Rt_map *clmp, uint_t flags)
{
int appl = 0;
if (rt_critical())
return;
if ((rtld_flags & RT_FL_APPLIC) == 0)
appl = rtld_flags |= RT_FL_APPLIC;
if (auditors && (auditors->ad_flags & LML_TFLG_AUD_ACTIVITY))
_audit_activity(auditors->ad_list, clmp, flags);
if (AUDITORS(clmp) &&
(AUDITORS(clmp)->ad_flags & LML_TFLG_AUD_ACTIVITY))
_audit_activity(AUDITORS(clmp)->ad_list, clmp, flags);
if (appl)
rtld_flags &= ~RT_FL_APPLIC;
}
/*
* la_objopen() caller. Create an audit information structure for the indicated
* link-map, regardless of an la_objopen() entry point. This structure is used
* to supply information to various audit interfaces (see LML_MSK_AUDINFO).
* Traverse through all audit library and call any la_objopen() entry points
* found.
*/
static int
_audit_objopen(APlist *list, Rt_map *nlmp, Lmid_t lmid, Audit_info *aip,
int *ndx)
{
Audit_list *alp;
Aliste idx;
for (APLIST_TRAVERSE(list, idx, alp)) {
uint_t flags;
Audit_client *acp;
/*
* Associate a cookie with the audit library, and assign the
* initial cookie as the present link-map.
*/
acp = &aip->ai_clients[(*ndx)++];
acp->ac_lmp = alp->al_lmp;
acp->ac_cookie = (uintptr_t)nlmp;
if (alp->al_objopen == NULL)
continue;
DBG_CALL(Dbg_audit_object(LIST(alp->al_lmp), alp->al_libname,
NAME(nlmp)));
leave(LIST(alp->al_lmp), thr_flg_reenter);
flags = (*alp->al_objopen)((Link_map *)nlmp, lmid,
&(acp->ac_cookie));
(void) enter(thr_flg_reenter);
if (flags & LA_FLG_BINDTO)
acp->ac_flags |= FLG_AC_BINDTO;
if (flags & LA_FLG_BINDFROM) {
ulong_t pltcnt;
acp->ac_flags |= FLG_AC_BINDFROM;
/*
* We only need dynamic plt's if a pltenter and/or a
* pltexit() entry point exist in one of our auditing
* libraries.
*/
if (aip->ai_dynplts || (JMPREL(nlmp) == 0) ||
((audit_flags & (AF_PLTENTER | AF_PLTEXIT)) == 0))
continue;
/*
* Create one dynplt for every 'PLT' that exists in the
* object.
*/
pltcnt = PLTRELSZ(nlmp) / RELENT(nlmp);
if ((aip->ai_dynplts = calloc(pltcnt,
dyn_plt_ent_size)) == NULL)
return (0);
}
}
return (1);
}
int
audit_objopen(Rt_map *clmp, Rt_map *nlmp)
{
Lmid_t lmid = get_linkmap_id(LIST(nlmp));
int appl = 0, respond = 1, ndx = 0;
uint_t clients = 0;
Audit_info *aip;
if (rt_critical())
return (respond);
/*
* Determine the total number of audit libraries in use. This provides
* the number of client structures required for this object.
*/
if (auditors)
clients = auditors->ad_cnt;
if (AUDITORS(clmp))
clients += AUDITORS(clmp)->ad_cnt;
if ((nlmp != clmp) && AUDITORS(nlmp))
clients += AUDITORS(nlmp)->ad_cnt;
/*
* The initial allocation of the audit information structure includes
* an array of audit clients, 1 per audit library presently available.
*
* ---------------
* | ai_cnt |
* Audit_info | ai_clients |-------
* | ai_dynplts | |
* |---------------| |
* Audit_client | 1 |<------
* |---------------|
* | 2 |
* .........
*/
if ((AUDINFO(nlmp) = aip = calloc(1, sizeof (Audit_info) +
(sizeof (Audit_client) * clients))) == NULL)
return (0);
aip->ai_cnt = clients;
aip->ai_clients = (Audit_client *)((uintptr_t)aip +
sizeof (Audit_info));
if ((rtld_flags & RT_FL_APPLIC) == 0)
appl = rtld_flags |= RT_FL_APPLIC;
if (auditors)
respond = _audit_objopen(auditors->ad_list, nlmp,
lmid, aip, &ndx);
if (respond && AUDITORS(clmp))
respond = _audit_objopen(AUDITORS(clmp)->ad_list, nlmp,
lmid, aip, &ndx);
if (respond && (nlmp != clmp) && AUDITORS(nlmp))
respond = _audit_objopen(AUDITORS(nlmp)->ad_list, nlmp,
lmid, aip, &ndx);
if (appl)
rtld_flags &= ~RT_FL_APPLIC;
return (respond);
}
/*
* la_objclose() caller. Traverse through all audit library and call any
* la_objclose() entry points found.
*/
void
_audit_objclose(APlist *list, Rt_map *lmp)
{
Audit_list *alp;
Aliste idx;
for (APLIST_TRAVERSE(list, idx, alp)) {
Audit_client *acp;
if (alp->al_objclose == NULL)
continue;
if ((acp = _audit_client(AUDINFO(lmp), alp->al_lmp)) == NULL)
continue;
leave(LIST(alp->al_lmp), thr_flg_reenter);
(*alp->al_objclose)(&(acp->ac_cookie));
(void) enter(thr_flg_reenter);
}
}
void
audit_objclose(Rt_map *clmp, Rt_map *lmp)
{
int appl = 0;
if (rt_critical())
return;
if ((rtld_flags & RT_FL_APPLIC) == 0)
appl = rtld_flags |= RT_FL_APPLIC;
if (auditors && (auditors->ad_flags & LML_TFLG_AUD_OBJCLOSE))
_audit_objclose(auditors->ad_list, lmp);
if (AUDITORS(clmp) &&
(AUDITORS(clmp)->ad_flags & LML_TFLG_AUD_OBJCLOSE))
_audit_objclose(AUDITORS(clmp)->ad_list, lmp);
if (appl)
rtld_flags &= ~RT_FL_APPLIC;
}
/*
* la_pltenter() caller. Traverse through all audit library and call any
* la_pltenter() entry points found. NOTE: this routine is called via the
* glue code established in elf_plt_trace_write(), the symbol descriptor is
* created as part of the glue and for 32bit environments the st_name is a
* pointer to the real symbol name (ie. it's already been adjusted with the
* objects base offset). For 64bit environments the st_name remains the
* original symbol offset and in this case it is used to compute the real name
* pointer and pass as a separate argument to the auditor.
*/
static void
_audit_pltenter(APlist *list, Rt_map *rlmp, Rt_map *dlmp, Sym *sym,
uint_t ndx, void *regs, uint_t *flags)
{
Audit_list *alp;
Aliste idx;
#if defined(_ELF64)
const char *name = (const char *)(sym->st_name + STRTAB(dlmp));
#else
const char *name = (const char *)(sym->st_name);
#endif
for (APLIST_TRAVERSE(list, idx, alp)) {
Audit_client *racp, *dacp;
Addr prev = sym->st_value;
if (alp->al_pltenter == 0)
continue;
if ((racp = _audit_client(AUDINFO(rlmp), alp->al_lmp)) == NULL)
continue;
if ((dacp = _audit_client(AUDINFO(dlmp), alp->al_lmp)) == NULL)
continue;
if (((racp->ac_flags & FLG_AC_BINDFROM) == 0) ||
((dacp->ac_flags & FLG_AC_BINDTO) == 0))
continue;
leave(LIST(alp->al_lmp), thr_flg_reenter);
sym->st_value = (Addr)(*alp->al_pltenter)(sym, ndx,
&(racp->ac_cookie), &(dacp->ac_cookie), regs,
/* BEGIN CSTYLED */
#if defined(_ELF64)
flags, name);
#else
flags);
#endif
/* END CSTYLED */
(void) enter(thr_flg_reenter);
DBG_CALL(Dbg_audit_symval(LIST(alp->al_lmp), alp->al_libname,
MSG_ORIG(MSG_AUD_PLTENTER), name, prev, sym->st_name));
}
}
Addr
audit_pltenter(Rt_map *rlmp, Rt_map *dlmp, Sym *sym, uint_t ndx,
void *regs, uint_t *flags)
{
Sym _sym = *sym;
int _appl = 0;
if (rt_critical())
return (_sym.st_value);
/*
* We're effectively entering ld.so.1 from user (glue) code.
*/
(void) enter(0);
if ((rtld_flags & RT_FL_APPLIC) == 0)
_appl = rtld_flags |= RT_FL_APPLIC;
if (auditors && (auditors->ad_flags & LML_TFLG_AUD_PLTENTER))
_audit_pltenter(auditors->ad_list, rlmp, dlmp, &_sym,
ndx, regs, flags);
if (AUDITORS(rlmp) &&
(AUDITORS(rlmp)->ad_flags & LML_TFLG_AUD_PLTENTER))
_audit_pltenter(AUDITORS(rlmp)->ad_list, rlmp, dlmp, &_sym,
ndx, regs, flags);
if (_appl)
rtld_flags &= ~RT_FL_APPLIC;
leave(LIST(rlmp), 0);
return (_sym.st_value);
}
/*
* la_pltexit() caller. Traverse through all audit library and call any
* la_pltexit() entry points found. See notes above (_audit_pltenter) for
* discussion on st_name.
*/
static Addr
_audit_pltexit(APlist *list, uintptr_t retval, Rt_map *rlmp, Rt_map *dlmp,
Sym *sym, uint_t ndx)
{
Audit_list *alp;
Aliste idx;
#if defined(_ELF64)
const char *name = (const char *)(sym->st_name + STRTAB(dlmp));
#endif
for (APLIST_TRAVERSE(list, idx, alp)) {
Audit_client *racp, *dacp;
if (alp->al_pltexit == 0)
continue;
if ((racp = _audit_client(AUDINFO(rlmp), alp->al_lmp)) == NULL)
continue;
if ((dacp = _audit_client(AUDINFO(dlmp), alp->al_lmp)) == NULL)
continue;
if (((racp->ac_flags & FLG_AC_BINDFROM) == 0) ||
((dacp->ac_flags & FLG_AC_BINDTO) == 0))
continue;
leave(LIST(alp->al_lmp), thr_flg_reenter);
retval = (*alp->al_pltexit)(sym, ndx,
&(racp->ac_cookie), &(dacp->ac_cookie),
/* BEGIN CSTYLED */
#if defined(_ELF64)
retval, name);
#else
retval);
#endif
/* END CSTYLED */
(void) enter(thr_flg_reenter);
}
return (retval);
}
Addr
audit_pltexit(uintptr_t retval, Rt_map *rlmp, Rt_map *dlmp, Sym *sym,
uint_t ndx)
{
uintptr_t _retval = retval;
int _appl = 0;
if (rt_critical())
return (_retval);
/*
* We're effectively entering ld.so.1 from user (glue) code.
*/
(void) enter(0);
if ((rtld_flags & RT_FL_APPLIC) == 0)
_appl = rtld_flags |= RT_FL_APPLIC;
if (auditors && (auditors->ad_flags & LML_TFLG_AUD_PLTEXIT))
_retval = _audit_pltexit(auditors->ad_list, _retval,
rlmp, dlmp, sym, ndx);
if (AUDITORS(rlmp) && (AUDITORS(rlmp)->ad_flags & LML_TFLG_AUD_PLTEXIT))
_retval = _audit_pltexit(AUDITORS(rlmp)->ad_list, _retval,
rlmp, dlmp, sym, ndx);
if (_appl)
rtld_flags &= ~RT_FL_APPLIC;
leave(LIST(rlmp), 0);
return (_retval);
}
/*
* la_symbind() caller. Traverse through all audit library and call any
* la_symbind() entry points found.
*/
static Addr
_audit_symbind(APlist *list, Rt_map *rlmp, Rt_map *dlmp, Sym *sym, uint_t ndx,
uint_t *flags, int *called)
{
Audit_list *alp;
Aliste idx;
#if defined(_ELF64)
const char *name = (const char *)(sym->st_name + STRTAB(dlmp));
#else
const char *name = (const char *)(sym->st_name);
#endif
for (APLIST_TRAVERSE(list, idx, alp)) {
Audit_client *racp, *dacp;
Addr prev = sym->st_value;
uint_t lflags;
if (alp->al_symbind == 0)
continue;
if ((racp = _audit_client(AUDINFO(rlmp), alp->al_lmp)) == NULL)
continue;
if ((dacp = _audit_client(AUDINFO(dlmp), alp->al_lmp)) == NULL)
continue;
if (((racp->ac_flags & FLG_AC_BINDFROM) == 0) ||
((dacp->ac_flags & FLG_AC_BINDTO) == 0))
continue;
/*
* The la_symbind interface is only called when the calling
* object has been identified as BINDFROM, and the destination
* object has been identified as BINDTO. Use a local version of
* the flags, so that any user update can be collected.
*/
called++;
lflags = (*flags & ~(LA_SYMB_NOPLTENTER | LA_SYMB_NOPLTEXIT));
leave(LIST(alp->al_lmp), thr_flg_reenter);
sym->st_value = (*alp->al_symbind)(sym, ndx,
&(racp->ac_cookie), &(dacp->ac_cookie),
/* BEGIN CSTYLED */
#if defined(_ELF64)
&lflags, name);
#else
&lflags);
#endif
/* END CSTYLED */
(void) enter(thr_flg_reenter);
/*
* If the auditor indicated that they did not want to process
* pltenter, or pltexit audits for this symbol, retain this
* information. Also retain whether an alternative symbol value
* has been supplied.
*/
*flags |= (lflags & (LA_SYMB_NOPLTENTER | LA_SYMB_NOPLTEXIT));
if ((prev != sym->st_value) && (alp->al_vernum >= LAV_VERSION2))
*flags |= LA_SYMB_ALTVALUE;
DBG_CALL(Dbg_audit_symval(LIST(alp->al_lmp), alp->al_libname,
MSG_ORIG(MSG_AUD_SYMBIND), name, prev, sym->st_value));
}
return (sym->st_value);
}
Addr
audit_symbind(Rt_map *rlmp, Rt_map *dlmp, Sym *sym, uint_t ndx, Addr value,
uint_t *flags)
{
Sym _sym;
int _appl = 0, called = 0;
/*
* Construct a new symbol from that supplied but with the real address.
* In the 64-bit world the st_name field is only 32-bits which isn't
* big enough to hold a character pointer. We pass this pointer as a
* separate parameter for 64-bit audit libraries.
*/
_sym = *sym;
_sym.st_value = value;
if (rt_critical())
return (_sym.st_value);
#if !defined(_ELF64)
_sym.st_name += (Word)STRTAB(dlmp);
#endif
if ((rtld_flags & RT_FL_APPLIC) == 0)
_appl = rtld_flags |= RT_FL_APPLIC;
if (auditors && (auditors->ad_flags & LML_TFLG_AUD_SYMBIND))
_sym.st_value = _audit_symbind(auditors->ad_list,
rlmp, dlmp, &_sym, ndx, flags, &called);
if (AUDITORS(rlmp) && (AUDITORS(rlmp)->ad_flags & LML_TFLG_AUD_SYMBIND))
_sym.st_value = _audit_symbind(AUDITORS(rlmp)->ad_list,
rlmp, dlmp, &_sym, ndx, flags, &called);
/*
* If no la_symbind() was called for this interface, fabricate that no
* la_pltenter, or la_pltexit is required. This helps reduce the glue
* code created for further auditing.
*/
if (caller == 0)
*flags |= (LA_SYMB_NOPLTENTER | LA_SYMB_NOPLTEXIT);
if (_appl)
rtld_flags &= ~RT_FL_APPLIC;
return (_sym.st_value);
}
/*
* la_preinit() caller. Traverse through all audit libraries and call any
* la_preinit() entry points found.
*/
static void
_audit_preinit(APlist *list, Rt_map *clmp)
{
Audit_list *alp;
Aliste idx;
for (APLIST_TRAVERSE(list, idx, alp)) {
Audit_client *acp;
if (alp->al_preinit == 0)
continue;
if ((acp = _audit_client(AUDINFO(clmp), alp->al_lmp)) == NULL)
continue;
leave(LIST(alp->al_lmp), thr_flg_reenter);
(*alp->al_preinit)(&(acp->ac_cookie));
(void) enter(thr_flg_reenter);
}
}
void
audit_preinit(Rt_map *clmp)
{
int appl = 0;
if (rt_critical())
return;
if ((rtld_flags & RT_FL_APPLIC) == 0)
appl = rtld_flags |= RT_FL_APPLIC;
if (auditors && (auditors->ad_flags & LML_TFLG_AUD_PREINIT))
_audit_preinit(auditors->ad_list, clmp);
if (AUDITORS(clmp) && (AUDITORS(clmp)->ad_flags & LML_TFLG_AUD_PREINIT))
_audit_preinit(AUDITORS(clmp)->ad_list, clmp);
if (appl)
rtld_flags &= ~RT_FL_APPLIC;
}
/*
* Clean up (free) an audit descriptor. First, gather a list of all handles,
* and then close each one down. This is done rather than using the handles
* directly from the auditors, as the audit list can be torn down as a result
* of the dlclose. In other words, what you're pointing at can be removed
* while your still pointing at it.
*/
void
audit_desc_cleanup(Rt_map *clmp)
{
Audit_desc *adp = AUDITORS(clmp);
Audit_list *alp;
Aliste idx;
APlist *ghalp = NULL;
if (adp == NULL)
return;
if (adp->ad_name)
free(adp->ad_name);
for (APLIST_TRAVERSE(adp->ad_list, idx, alp))
(void) aplist_append(&ghalp, alp->al_ghp, AL_CNT_GROUPS);
free(adp->ad_list);
adp->ad_list = NULL;
free(adp);
AUDITORS(clmp) = NULL;
if (ghalp) {
Grp_hdl *ghp;
Aliste idx;
for (APLIST_TRAVERSE(ghalp, idx, ghp)) {
(void) dlclose_intn(ghp, clmp);
}
free(ghalp);
}
}
/*
* Clean up (free) an audit information structure.
*/
void
audit_info_cleanup(Rt_map *clmp)
{
Audit_info *aip = AUDINFO(clmp);
if (aip == NULL)
return;
if (aip->ai_dynplts)
free(aip->ai_dynplts);
free(aip);
}
/*
* Create a data structure of symbol lookup names and associated flags to help
* simplify audit_symget() use.
*/
typedef struct {
Msg sname;
uint_t alflag;
uint_t auflag;
} Aud_info;
static const Aud_info aud_info[] = {
{ MSG_SYM_LAVERSION, 0 }, /* MSG_ORIG(MSG_SYM_LAVERSION) */
{ MSG_SYM_LAPREINIT, /* MSG_ORIG(MSG_SYM_LAPREINIT) */
LML_TFLG_AUD_PREINIT, 0 },
{ MSG_SYM_LAOBJSEARCH, /* MSG_ORIG(MSG_SYM_LAOBJSEARCH) */
LML_TFLG_AUD_OBJSEARCH, 0 },
{ MSG_SYM_LAOBJOPEN, /* MSG_ORIG(MSG_SYM_LAOBJOPEN) */
LML_TFLG_AUD_OBJOPEN, 0 },
{ MSG_SYM_LAOBJFILTER, /* MSG_ORIG(MSG_SYM_LAOBJFILTER */
LML_TFLG_AUD_OBJFILTER, 0 },
{ MSG_SYM_LAOBJCLOSE, /* MSG_ORIG(MSG_SYM_LAOBJCLOSE) */
LML_TFLG_AUD_OBJCLOSE, 0 },
{ MSG_SYM_LAACTIVITY, /* MSG_ORIG(MSG_SYM_LAACTIVITY) */
LML_TFLG_AUD_ACTIVITY, 0 },
#if defined(_ELF64)
{ MSG_SYM_LASYMBIND_64, /* MSG_ORIG(MSG_SYM_LASYMBIND_64) */
#else
{ MSG_SYM_LASYMBIND, /* MSG_ORIG(MSG_SYM_LASYMBIND) */
#endif
LML_TFLG_AUD_SYMBIND, 0 },
#if defined(__sparcv9)
{ MSG_SYM_LAV9PLTENTER, /* MSG_ORIG(MSG_SYM_LAV9PLTENTER) */
#elif defined(__sparc)
{ MSG_SYM_LAV8PLTENTER, /* MSG_ORIG(MSG_SYM_LAV8PLTENTER) */
#elif defined(__amd64)
{ MSG_SYM_LAAMD64PLTENTER, /* MSG_ORIG(MSG_SYM_LAAMD64PLTENTER) */
#elif defined(__i386)
{ MSG_SYM_LAX86PLTENTER, /* MSG_ORIG(MSG_SYM_LAX86PLTENTER) */
#else
#error platform not defined!
#endif
LML_TFLG_AUD_PLTENTER, AF_PLTENTER },
#if defined(_ELF64)
{ MSG_SYM_LAPLTEXIT_64, /* MSG_ORIG(MSG_SYM_LAPLTEXIT_64) */
#else
{ MSG_SYM_LAPLTEXIT, /* MSG_ORIG(MSG_SYM_LAPLTEXIT) */
#endif
LML_TFLG_AUD_PLTEXIT, AF_PLTEXIT }
};
#define AI_LAVERSION 0
#define AI_LAPREINIT 1
#define AI_LAOBJSEARCH 2
#define AI_LAOBJOPEN 3
#define AI_LAOBJFILTER 4
#define AI_LAOBJCLOSE 5
#define AI_LAACTIVITY 6
#define AI_LASYMBIND 7
#define AI_LAPLTENTER 8
#define AI_LAPLTEXIT 9
static Addr
audit_symget(Audit_list *alp, int info, int *in_nfavl)
{
Rt_map *lmp = alp->al_lmp;
const char *sname = MSG_ORIG(aud_info[info].sname);
uint_t alflag = aud_info[info].alflag;
uint_t auflag = aud_info[info].auflag;
uint_t binfo;
Slookup sl;
Sresult sr;
/*
* Initialize the symbol lookup, and symbol result, data structures.
*/
SLOOKUP_INIT(sl, sname, lml_rtld.lm_head, lmp, ld_entry_cnt,
0, 0, 0, 0, (LKUP_FIRST | LKUP_DLSYM));
SRESULT_INIT(sr, sname);
if (LM_LOOKUP_SYM(lmp)(&sl, &sr, &binfo, in_nfavl)) {
Addr addr = sr.sr_sym->st_value;
if (!(FLAGS(lmp) & FLG_RT_FIXED))
addr += ADDR(lmp);
if (alflag)
alp->al_flags |= alflag;
if (auflag)
audit_flags |= auflag;
DBG_CALL(Dbg_audit_interface(LIST(alp->al_lmp),
alp->al_libname, sr.sr_name));
return (addr);
}
return (0);
}
/*
* Centralize cleanup routines.
*/
static int
audit_disable(char *name, Rt_map *clmp, Grp_hdl *ghp, Audit_list *alp)
{
eprintf(LIST(clmp), ERR_FATAL, MSG_INTL(MSG_AUD_DISABLED), name);
if (ghp)
(void) dlclose_intn(ghp, clmp);
if (alp)
free(alp);
return (0);
}
/*
* Given a list of one or more audit libraries, open each one and establish a
* a descriptor representing the entry points it provides.
*/
int
audit_setup(Rt_map *clmp, Audit_desc *adp, uint_t orig, int *in_nfavl)
{
char *ptr, *next;
Lm_list *clml = LIST(clmp);
int error = 1;
DBG_CALL(Dbg_audit_lib(clml, adp->ad_name));
/*
* Mark that we have at least one auditing link map
*/
rtld_flags2 |= RT_FL2_HASAUDIT;
/*
* The audit definitions may be a list (which will already have been
* dupped) so split it into individual tokens.
*/
for (ptr = strtok_r(adp->ad_name, MSG_ORIG(MSG_STR_DELIMIT), &next);
ptr; ptr = strtok_r(NULL, MSG_ORIG(MSG_STR_DELIMIT), &next)) {
Grp_hdl *ghp;
Rt_map *lmp;
Rt_map **tobj;
Audit_list *alp;
/*
* Open the audit library on its own link-map.
*/
if ((ghp = dlmopen_intn((Lm_list *)LM_ID_NEWLM, ptr,
(RTLD_FIRST | RTLD_GLOBAL | RTLD_WORLD), clmp,
FLG_RT_AUDIT, orig)) == NULL) {
error = audit_disable(ptr, clmp, 0, 0);
continue;
}
lmp = ghp->gh_ownlmp;
/*
* If this auditor has already been loaded, reuse it.
*/
if ((alp = LIST(lmp)->lm_alp) != NULL) {
if (aplist_append(&(adp->ad_list), alp,
AL_CNT_AUDITORS) == NULL)
return (audit_disable(ptr, clmp, ghp, alp));
adp->ad_cnt++;
DBG_CALL(Dbg_audit_version(clml, alp->al_libname,
alp->al_vernum));
adp->ad_flags |= alp->al_flags;
continue;
}
/*
* Prior to the Unified Process Model (UPM) environment, an
* rtld lock had to be held upon leave(). However, even within
* a UPM environment, an old auditor, that has a lazy dependency
* on libc, is still a possibility. As libc isn't loaded, we
* don't know the process model, and will determine this later.
* Refer to external.c:get_lcinterface().
*/
if ((rtld_flags2 & RT_FL2_UNIFPROC) == 0)
LIST(lmp)->lm_flags |= LML_FLG_HOLDLOCK;
/*
* Allocate an audit list descriptor for this object and
* search for all known entry points.
*/
if ((alp = calloc(1, sizeof (Audit_list))) == NULL)
return (audit_disable(ptr, clmp, ghp, 0));
alp->al_libname = NAME(lmp);
alp->al_lmp = lmp;
alp->al_ghp = ghp;
/*
* All audit libraries must handshake through la_version().
* Determine that the symbol exists, finish initializing the
* object, and then call the function.
*/
if ((alp->al_version = (uint_t(*)())audit_symget(alp,
AI_LAVERSION, in_nfavl)) == 0) {
eprintf(LIST(lmp), ERR_FATAL, MSG_INTL(MSG_GEN_NOSYM),
MSG_ORIG(MSG_SYM_LAVERSION));
error = audit_disable(ptr, clmp, ghp, alp);
continue;
}
if ((tobj = tsort(lmp, LIST(lmp)->lm_init, RT_SORT_REV)) ==
(Rt_map **)S_ERROR)
return (audit_disable(ptr, clmp, ghp, alp));
rtld_flags |= RT_FL_APPLIC;
if (tobj != (Rt_map **)NULL)
call_init(tobj, DBG_INIT_SORT);
alp->al_vernum = alp->al_version(LAV_CURRENT);
rtld_flags &= ~RT_FL_APPLIC;
if ((alp->al_vernum < LAV_VERSION1) ||
(alp->al_vernum > LAV_CURRENT)) {
eprintf(LIST(lmp), ERR_FATAL, MSG_INTL(MSG_AUD_BADVERS),
LAV_CURRENT, alp->al_vernum);
error = audit_disable(ptr, clmp, ghp, alp);
continue;
}
if (aplist_append(&(adp->ad_list), alp,
AL_CNT_AUDITORS) == NULL)
return (audit_disable(ptr, clmp, ghp, alp));
adp->ad_cnt++;
DBG_CALL(Dbg_audit_version(clml, alp->al_libname,
alp->al_vernum));
/*
* Collect any remaining entry points.
*/
alp->al_preinit = (void(*)())audit_symget(alp,
AI_LAPREINIT, in_nfavl);
alp->al_objsearch = (char *(*)())audit_symget(alp,
AI_LAOBJSEARCH, in_nfavl);
alp->al_objopen = (uint_t(*)())audit_symget(alp,
AI_LAOBJOPEN, in_nfavl);
alp->al_objfilter = (int(*)())audit_symget(alp,
AI_LAOBJFILTER, in_nfavl);
alp->al_objclose = (uint_t(*)())audit_symget(alp,
AI_LAOBJCLOSE, in_nfavl);
alp->al_activity = (void (*)())audit_symget(alp,
AI_LAACTIVITY, in_nfavl);
alp->al_symbind = (uintptr_t(*)())audit_symget(alp,
AI_LASYMBIND, in_nfavl);
alp->al_pltenter = (uintptr_t(*)())audit_symget(alp,
AI_LAPLTENTER, in_nfavl);
alp->al_pltexit = (uintptr_t(*)())audit_symget(alp,
AI_LAPLTEXIT, in_nfavl);
/*
* Collect the individual object flags, and assign this audit
* list descriptor to its associated link-map list.
*/
adp->ad_flags |= alp->al_flags;
LIST(lmp)->lm_alp = alp;
}
/*
* Free the original audit string, as this descriptor may be used again
* to add additional auditing.
*/
free(adp->ad_name);
adp->ad_name = NULL;
return (error);
}