10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * CDDL HEADER START
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * The contents of this file are subject to the terms of the
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * Common Development and Distribution License (the "License").
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * You may not use this file except in compliance with the License.
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * See the License for the specific language governing permissions
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * and limitations under the License.
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * When distributing Covered Code, include this CDDL HEADER in each
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * If applicable, add the following below this CDDL HEADER, with the
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * fields enclosed by brackets "[]" replaced with your own identifying
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * information: Portions Copyright [yyyy] [name of copyright owner]
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * CDDL HEADER END
2020b2b6df0384feda1732f65486c4604fbf5beaRod Evans * Copyright (c) 1992, 2010, Oracle and/or its affiliates. All rights reserved.
2d08521bd15501c8370ba2153b9cca4f094979d0Garrett D'Amore * Copyright 2014 Garrett D'Amore <garrett@damore.org>
b599bd937c305a895426e8c412ca920ce7824850Robert Mustacchi * Copyright 2015 Joyent, Inc.
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * Implementation of all external interfaces between ld.so.1 and libc.
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * This file started as a set of routines that provided synchronization and
43d7826ada3fc66e7100086426530c695d695911Rod Evans * locking operations using calls to libthread. libthread has merged with libc
43d7826ada3fc66e7100086426530c695d695911Rod Evans * under the Unified Process Model (UPM), and things have gotten a lot simpler.
43d7826ada3fc66e7100086426530c695d695911Rod Evans * This file continues to establish and redirect various events within ld.so.1
43d7826ada3fc66e7100086426530c695d695911Rod Evans * to interfaces within libc.
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * Until libc is loaded and relocated, any external interfaces are captured
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * locally. Each link-map list maintains its own set of external vectors, as
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * each link-map list typically provides its own libc. Although this per-link-
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * map list vectoring provides a degree of flexibility, there is a protocol
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * expected when calling various libc interfaces.
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * i. Any new alternative link-map list should call CI_THRINIT, and then call
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * CI_TLS_MODADD to register any TLS for each object of that link-map list
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * (this item is labeled i. as auditors can be the first objects loaded,
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * and they exist on their own lik-map list).
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * ii. For the primary link-map list, CI_TLS_STATMOD must be called first to
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * register any static TLS. This routine is called regardless of there
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * being any TLS, as this routine also establishes the link-map list as the
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * primary list and fixes the association of uberdata). CI_THRINIT should
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * then be called.
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * iii. Any objects added to an existing link-map list (primary or alternative)
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * should call CI_TLS_MODADD to register any additional TLS.
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * These events are established by:
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * i. Typically, libc is loaded as part of the primary dependencies of any
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * link-map list (since the Unified Process Model (UPM), libc can't be
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * lazily loaded). To minimize the possibility of loading and registering
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * objects, and then tearing them down (because of a relocation error),
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * external vectors are established as part of load_completion(). This
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * routine is called on completion of any operation that can cause objects
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * to be loaded. This point of control insures the objects have been fully
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * analyzed and relocated, and moved to their controlling link-map list.
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * The external vectors are established prior to any .inits being fired.
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * ii. Calls to CI_THRINIT, and CI_TLS_MODADD also occur as part of
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * load_completion(). CI_THRINIT is only called once for each link-map
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * control list.
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * iii. Calls to CI_TLS_STATMOD, and CI_THRINIT occur for the primary link-map
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * list in the final stages of setup().
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * The interfaces provide by libc can be divided into two families. The first
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * family consists of those interfaces that should be called from the link-map
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * list. It's possible that these interfaces convey state concerning the
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * link-map list they are part of:
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * CI_ATEXIT
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * CI TLS_MODADD
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * CI_TLS_MODREM
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * CI_TLS_STATMOD
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * CI_THRINIT
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * The second family are global in nature, that is, the link-map list from
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * which they are called provides no state information. In fact, for
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * CI_BIND_GUARD, the calling link-map isn't even known. The link-map can only
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * be deduced after ld.so.1's global lock has been obtained. Therefore, the
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * following interfaces are also maintained as global:
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * CI_LCMESSAGES
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * CI_BIND_GUARD
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * CI_BIND_CLEAR
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * CI_THR_SELF
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * Note, it is possible that these global interfaces are obtained from an
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * alternative link-map list that gets torn down because of a processing
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * failure (unlikely, because the link-map list components must be analyzed
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * and relocated prior to load_completion(), but perhaps the tear down is still
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * a possibility). Thus the global interfaces may have to be replaced. Once
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * the interfaces have been obtained from the primary link-map, they can
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * remain fixed, as the primary link-map isn't going to go anywhere.
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * The last wrinkle in the puzzle is what happens if an alternative link-map
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * is loaded with no libc dependency? In this case, the alternative objects
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * can not call CI_THRINIT, can not be allowed to use TLS, and will not receive
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * any atexit processing.
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * The history of these external interfaces is defined by their version:
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * TI_VERSION == 1
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * Under this model libthread provided rw_rwlock/rw_unlock, through which
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * all rt_mutex_lock/rt_mutex_unlock calls were vectored.
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * Under libc/libthread these interfaces provided _sigon/_sigoff (unlike
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * lwp/libthread that provided signal blocking via bind_guard/bind_clear).
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * TI_VERSION == 2
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * Under this model only libthreads bind_guard/bind_clear and thr_self
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * interfaces were used. Both libthreads blocked signals under the
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * bind_guard/bind_clear interfaces. Lower level locking is derived
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * from internally bound _lwp_ interfaces. This removes recursive
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * problems encountered when obtaining locking interfaces from libthread.
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * The use of mutexes over reader/writer locks also enables the use of
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * condition variables for controlling thread concurrency (allows access
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * to objects only after their .init has completed).
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * NOTE, the TI_VERSION indicated the ti_interface version number, where the
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * ti_interface was a large vector of functions passed to both libc (to override
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * the thread stub interfaces) and ld.so.1. ld.so.1 used only a small subset of
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * these interfaces.
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * CI_VERSION == 1
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * Introduced with CI_VERSION & CI_ATEXIT
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * CI_VERSION == 2 (Solaris 8 update 2).
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * Added support for CI_LCMESSAGES
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * CI_VERSION == 3 (Solaris 9).
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * Added the following versions to the CI table:
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * CI_BIND_GUARD, CI_BIND_CLEAR, CI_THR_SELF
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * CI_TLS_MODADD, CI_TLS_MOD_REMOVE, CI_TLS_STATMOD
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * This version introduced the DT_SUNW_RTLDINFO structure as a mechanism
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * to handshake with ld.so.1.
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * CI_VERSION == 4 (Solaris 10).
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * Added the CI_THRINIT handshake as part of the libc/libthread unified
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * process model. libc now initializes the current thread pointer from
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * this interface (and no longer relies on the INITFIRST flag - which
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * others have started to camp out on).
2a8d6eba033e4713ab12b61178f0513f1f075482Rod Evans * CI_VERSION == 5 (Solaris 11).
2a8d6eba033e4713ab12b61178f0513f1f075482Rod Evans * Use of "protected" references within libc, so that symbols are
2a8d6eba033e4713ab12b61178f0513f1f075482Rod Evans * pre-bound, and don't require ld.so.1 binding. This implementation
2a8d6eba033e4713ab12b61178f0513f1f075482Rod Evans * protects libc's critical regions from being vectored to auditors.
2a8d6eba033e4713ab12b61178f0513f1f075482Rod Evans * CI_VERSION == 6 (Solaris 11).
2a8d6eba033e4713ab12b61178f0513f1f075482Rod Evans * Added the CI_CRITICAL handshake, to allow "mem*" family to be reexposed
2a8d6eba033e4713ab12b61178f0513f1f075482Rod Evans * as "global", and thus be redirected to auxiliary filters.
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * Release summary:
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * Solaris 8 CI_ATEXIT via _ld_libc()
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * TI_* via _ld_concurrency()
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * Solaris 9 CI_ATEXIT and CI_LCMESSAGES via _ld_libc()
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * CI_* via RTLDINFO and _ld_libc() - new libthread
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * TI_* via _ld_concurrency() - old libthread
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * Solaris 10 CI_ATEXIT and CI_LCMESSAGES via _ld_libc()
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * CI_* via RTLDINFO and _ld_libc() - new libthread
a574db851cdc636fc3939b68e80d79fe7fbd57f2raf#include "_elf.h"
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * This interface provides the unified process model communication between
43d7826ada3fc66e7100086426530c695d695911Rod Evans * ld.so.1 and libc. This interface can be called a number of times:
43d7826ada3fc66e7100086426530c695d695911Rod Evans * - Initially, this interface is called to process RTLDINFO. This data
43d7826ada3fc66e7100086426530c695d695911Rod Evans * structure is typically provided by libc, and contains the address of
43d7826ada3fc66e7100086426530c695d695911Rod Evans * libc interfaces that must be called to initialize threads information.
43d7826ada3fc66e7100086426530c695d695911Rod Evans * - _ld_libc(), this interface can also be called by libc at process
43d7826ada3fc66e7100086426530c695d695911Rod Evans * initialization, after libc has been loaded and relocated, but before
43d7826ada3fc66e7100086426530c695d695911Rod Evans * control has been passed to any user code (.init's or main()). This
43d7826ada3fc66e7100086426530c695d695911Rod Evans * call provides additional libc interface information that ld.so.1 must
43d7826ada3fc66e7100086426530c695d695911Rod Evans * call during process execution.
43d7826ada3fc66e7100086426530c695d695911Rod Evans * - _ld_libc() can also be called by libc during process execution to
43d7826ada3fc66e7100086426530c695d695911Rod Evans * re-establish interfaces such as the locale.
43d7826ada3fc66e7100086426530c695d695911Rod Evans * Once the process is active, ensure we grab a lock.
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie for (tag = funcs->ci_tag; tag; tag = (++funcs)->ci_tag) {
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * Maintain all interfaces on a per-link-map basis. Note, for
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * most interfaces, only the first interface is used for any
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * link-map list. This prevents accidents with developers who
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * manage to load two different versions of libc.
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * Process any interfaces that must be maintained on a global
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie switch (tag) {
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * At startup, ld.so.1 can establish a locale from one
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * of the locale family of environment variables (see
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * ld_str_env() and readenv_user()). During process
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * execution the locale can also be changed by the user.
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * This interface is called from libc should the locale
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * be modified. Presently, only one global locale is
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * maintained for all link-map lists, and only objects
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * on the primrary link-map may change this locale.
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * If we've obtained a message locale (typically
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * supplied via libc's setlocale()), then
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * register the locale for use in dgettext() so
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * as to reestablish the locale for ld.so.1's
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * messages.
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * Clear any cached messages.
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * If the global vector is unset, or this is the primary
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * link-map, set the global vector.
43d7826ada3fc66e7100086426530c695d695911Rod Evans if ((gptr == NULL) || (lml->lm_flags & LML_FLG_BASELM))
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie /* FALLTHROUGH */
8cd45542f2a452ca0dab13d8b2d5cfa876ccbebcraf#if defined(CI_V_FIVE)
43d7826ada3fc66e7100086426530c695d695911Rod Evans * We might have seen an auditor which is not
43d7826ada3fc66e7100086426530c695d695911Rod Evans * dependent on libc. Such an auditor's link
43d7826ada3fc66e7100086426530c695d695911Rod Evans * map list has LML_FLG_HOLDLOCK set. This
43d7826ada3fc66e7100086426530c695d695911Rod Evans * lock needs to be dropped. Refer to
43d7826ada3fc66e7100086426530c695d695911Rod Evans * audit_setup() in audit.c.
57ef7aa924e4bfdf3118d9b5b4285dfc94b632f3Rod Evans * Yes, we did. Take care of them.
43d7826ada3fc66e7100086426530c695d695911Rod Evans * If a version of libc gives us only a subset of the TLS
43d7826ada3fc66e7100086426530c695d695911Rod Evans * interfaces, it's confused and we discard the whole lot.
43d7826ada3fc66e7100086426530c695d695911Rod Evans * Indicate that we're now thread capable.
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * At this point we know we have a set of objects that have been fully analyzed
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * and relocated. Prior to the next major step of running .init sections (ie.
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * running user code), retrieve any RTLDINFO interfaces.
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * Perform some sanity checks. If we have TLS requirements we better
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * have the associated external interfaces.
43d7826ada3fc66e7100086426530c695d695911Rod Evans (lml->lm_lcs[CI_TLS_STATMOD].lc_un.lc_func == NULL)) {
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie return (0);
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie return (1);
43d7826ada3fc66e7100086426530c695d695911Rod Evans * Provide an interface for libc to communicate additional interface
43d7826ada3fc66e7100086426530c695d695911Rod Evans * information.
43d7826ada3fc66e7100086426530c695d695911Rod Evans get_lcinterface(_caller(caller(), CL_EXECDEF), (Lc_interface *)ptr);
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie int (*fptr)(int);
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie if ((fptr = glcs[CI_BIND_GUARD].lc_un.lc_func) != NULL) {
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie return (1);
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie return (0);
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie int (*fptr)(int);
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie if ((fptr = glcs[CI_BIND_CLEAR].lc_un.lc_func) != NULL) {
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie return (0);
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * Make sure threads have been initialized. This interface is called once for
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * each link-map list.
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie void (*fptr)(void);
43d7826ada3fc66e7100086426530c695d695911Rod Evans (void (*)())lml->lm_lcs[CI_THRINIT].lc_un.lc_func) != NULL) {
dde769a2c00c82faaf80563ddd5610de2f4da339Rod Evans * If this is an alternative link-map list, and this is the
dde769a2c00c82faaf80563ddd5610de2f4da339Rod Evans * first call to initialize threads, don't let the destination
dde769a2c00c82faaf80563ddd5610de2f4da339Rod Evans * libc be deleted. It is possible that an auditors complete
dde769a2c00c82faaf80563ddd5610de2f4da339Rod Evans * initialization fails, but there is presently no main link-map
dde769a2c00c82faaf80563ddd5610de2f4da339Rod Evans * list. As this libc has established the thread pointer, don't
dde769a2c00c82faaf80563ddd5610de2f4da339Rod Evans * delete this libc, otherwise the initialization of libc on the
dde769a2c00c82faaf80563ddd5610de2f4da339Rod Evans * main link-map can be compromised during its threads
dde769a2c00c82faaf80563ddd5610de2f4da339Rod Evans * initialization.
dde769a2c00c82faaf80563ddd5610de2f4da339Rod Evans MODE(lml->lm_lcs[CI_THRINIT].lc_lmp) |= RTLD_NODELETE;
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie if ((fptr = (thread_t (*)())glcs[CI_THR_SELF].lc_un.lc_func) != NULL)
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie return ((*fptr)());
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie return (1);
2a8d6eba033e4713ab12b61178f0513f1f075482Rod Evans * Test whether we're in a libc critical region. Certain function references,
2a8d6eba033e4713ab12b61178f0513f1f075482Rod Evans * like the "mem*" family, might require binding. Although these functions can
2a8d6eba033e4713ab12b61178f0513f1f075482Rod Evans * safely bind to auxiliary filtees, they should not be captured by auditors.
2a8d6eba033e4713ab12b61178f0513f1f075482Rod Evans int (*fptr)(void);
2a8d6eba033e4713ab12b61178f0513f1f075482Rod Evans if ((fptr = glcs[CI_CRITICAL].lc_un.lc_func) != NULL)
2a8d6eba033e4713ab12b61178f0513f1f075482Rod Evans return ((*fptr)());
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * Mutex interfaces to resolve references from any objects extracted from
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * libc_pic.a. Note, as ld.so.1 is essentially single threaded these can be
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie/* ARGSUSED */
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie return (0);
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie/* ARGSUSED */
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie return (0);
494a4c5197688884a8a9a926ffc8d6627ba3bc1braf/* ARGSUSED */
494a4c5197688884a8a9a926ffc8d6627ba3bc1braf return (0);
494a4c5197688884a8a9a926ffc8d6627ba3bc1braf/* ARGSUSED */
494a4c5197688884a8a9a926ffc8d6627ba3bc1braf return (0);
10a4fa49f51ed9ae1c857a626de6ce9ebf41661arie * This is needed to satisfy sysconf() (case _SC_THREAD_STACK_MIN)
23a1ccea6aac035f084a7a4cdc968687d1b02dafRoger A. Faulkner * Local str[n]casecmp() interfaces for the dynamic linker,
23a1ccea6aac035f084a7a4cdc968687d1b02dafRoger A. Faulkner * to avoid problems when linking with libc_pic.a
23a1ccea6aac035f084a7a4cdc968687d1b02dafRoger A. Faulkner extern int ascii_strcasecmp(const char *, const char *);
23a1ccea6aac035f084a7a4cdc968687d1b02dafRoger A. Faulknerstrncasecmp(const char *s1, const char *s2, size_t n)
23a1ccea6aac035f084a7a4cdc968687d1b02dafRoger A. Faulkner extern int ascii_strncasecmp(const char *, const char *, size_t);
a574db851cdc636fc3939b68e80d79fe7fbd57f2raf * The following functions are cancellation points in libc.
a574db851cdc636fc3939b68e80d79fe7fbd57f2raf * They are called from other functions in libc that we extract
a574db851cdc636fc3939b68e80d79fe7fbd57f2raf * and use directly. We don't do cancellation while we are in
a574db851cdc636fc3939b68e80d79fe7fbd57f2raf * the dynamic linker, so we redefine these to call the primitive,
a574db851cdc636fc3939b68e80d79fe7fbd57f2raf * non-cancellation interfaces.
a574db851cdc636fc3939b68e80d79fe7fbd57f2raf extern int __close(int);
a574db851cdc636fc3939b68e80d79fe7fbd57f2raf extern int __fcntl(int, int, ...);
8fd04b8338ed5093ec2d1e668fa620b7de44c177Roger A. Faulkner extern int __open(const char *, int, mode_t);
8fd04b8338ed5093ec2d1e668fa620b7de44c177Roger A. Faulkner extern int __openat(int, const char *, int, mode_t);
2d08521bd15501c8370ba2153b9cca4f094979d0Garrett D'Amore * ASCII versions of ctype character classification functions. This avoids
2d08521bd15501c8370ba2153b9cca4f094979d0Garrett D'Amore * pulling in the entire locale framework that is in libc.
2d08521bd15501c8370ba2153b9cca4f094979d0Garrett D'Amore return (((c == ' ') || (c == '\t') || (c == '\r') || (c == '\n') ||
2d08521bd15501c8370ba2153b9cca4f094979d0Garrett D'Amore return ((isdigit(c) || (c >= 'A' && c <= 'F') ||
2d08521bd15501c8370ba2153b9cca4f094979d0Garrett D'Amore return ((isupper(c) || islower(c)) ? 1 : 0);
2d08521bd15501c8370ba2153b9cca4f094979d0Garrett D'Amore return ((isalpha(c) || isdigit(c)) ? 1 : 0);
b599bd937c305a895426e8c412ca920ce7824850Robert Mustacchi * In a similar vein to the is* functions above, we also have to define our own
b599bd937c305a895426e8c412ca920ce7824850Robert Mustacchi * version of strerror, as it is implemented in terms of the locale aware
b599bd937c305a895426e8c412ca920ce7824850Robert Mustacchi * strerror_l, and we'd rather not have the full set of libc symbols used here.
b599bd937c305a895426e8c412ca920ce7824850Robert Mustacchiextern const char _sys_errs[];
b599bd937c305a895426e8c412ca920ce7824850Robert Mustacchiextern const int _sys_index[];
b599bd937c305a895426e8c412ca920ce7824850Robert Mustacchi if (errnum < _sys_num_err && errnum >= 0) {
b599bd937c305a895426e8c412ca920ce7824850Robert Mustacchi return (dgettext("SUNW_OST_OSLIB", "Unknown error"));