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Fri, 09 Aug 2024 17:44:18 -0400 X-MC-Unique: WzBp4POZPnCirFFM4N4NWA-1 Received: from mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.12]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-04.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id A8D6E1944B29 for ; Fri, 9 Aug 2024 21:44:17 +0000 (UTC) Received: from oldenburg.str.redhat.com (unknown [10.2.16.5]) by mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 82C9819560A7 for ; Fri, 9 Aug 2024 21:44:16 +0000 (UTC) From: Florian Weimer To: libc-alpha@sourceware.org Subject: [PATCH 1/3] elf: Signal la_objopen for the proxy link map in dlmopen (bug 31985) In-Reply-To: Message-ID: References: X-From-Line: abbce3580f666bb1a0822c4664dece89e13a386b Mon Sep 17 00:00:00 2001 Date: Fri, 09 Aug 2024 23:44:13 +0200 User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com X-Spam-Status: No, score=-10.8 required=5.0 tests=BAYES_00, DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H4, RCVD_IN_MSPIKE_WL, SPF_HELO_NONE, SPF_NONE, TXREP autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: libc-alpha-bounces~incoming=patchwork.ozlabs.org@sourceware.org --- elf/dl-load.c | 61 ++++++++++++++++++++++++++--------------------- elf/tst-audit23.c | 12 +++++++++- 2 files changed, 45 insertions(+), 28 deletions(-) diff --git a/elf/dl-load.c b/elf/dl-load.c index 8a89b71016..54c9c4d779 100644 --- a/elf/dl-load.c +++ b/elf/dl-load.c @@ -918,6 +918,37 @@ _dl_process_pt_gnu_property (struct link_map *l, int fd, const ElfW(Phdr) *ph) } } +static void +_dl_notify_new_object (int mode, Lmid_t nsid, struct link_map *l) +{ + /* Signal that we are going to add new objects. */ + struct r_debug *r = _dl_debug_update (nsid); + if (r->r_state == RT_CONSISTENT) + { +#ifdef SHARED + /* Auditing checkpoint: we are going to add new objects. Since this + is called after _dl_add_to_namespace_list the namespace is guaranteed + to not be empty. */ + if ((mode & __RTLD_AUDIT) == 0) + _dl_audit_activity_nsid (nsid, LA_ACT_ADD); +#endif + + /* Notify the debugger we have added some objects. We need to + call _dl_debug_initialize in a static program in case dynamic + linking has not been used before. */ + r->r_state = RT_ADD; + _dl_debug_state (); + LIBC_PROBE (map_start, 2, nsid, r); + } + else + assert (r->r_state == RT_ADD); + +#ifdef SHARED + /* Auditing checkpoint: we have a new object. */ + if (!GL(dl_ns)[l->l_ns]._ns_loaded->l_auditing) + _dl_audit_objopen (l, nsid); +#endif +} /* Map in the shared object NAME, actually located in REALNAME, and already opened on FD. */ @@ -1018,6 +1049,8 @@ _dl_map_object_from_fd (const char *name, const char *origname, int fd, /* Add the map for the mirrored object to the object list. */ _dl_add_to_namespace_list (l, nsid); + _dl_notify_new_object (mode, nsid, l); + return l; } #endif @@ -1442,33 +1475,7 @@ cannot enable executable stack as shared object requires"); if (mode & __RTLD_SPROF) return l; - /* Signal that we are going to add new objects. */ - struct r_debug *r = _dl_debug_update (nsid); - if (r->r_state == RT_CONSISTENT) - { -#ifdef SHARED - /* Auditing checkpoint: we are going to add new objects. Since this - is called after _dl_add_to_namespace_list the namespace is guaranteed - to not be empty. */ - if ((mode & __RTLD_AUDIT) == 0) - _dl_audit_activity_nsid (nsid, LA_ACT_ADD); -#endif - - /* Notify the debugger we have added some objects. We need to - call _dl_debug_initialize in a static program in case dynamic - linking has not been used before. */ - r->r_state = RT_ADD; - _dl_debug_state (); - LIBC_PROBE (map_start, 2, nsid, r); - } - else - assert (r->r_state == RT_ADD); - -#ifdef SHARED - /* Auditing checkpoint: we have a new object. */ - if (!GL(dl_ns)[l->l_ns]._ns_loaded->l_auditing) - _dl_audit_objopen (l, nsid); -#endif + _dl_notify_new_object (mode, nsid, l); return l; } diff --git a/elf/tst-audit23.c b/elf/tst-audit23.c index d2640fe8b2..8b3a09a7e1 100644 --- a/elf/tst-audit23.c +++ b/elf/tst-audit23.c @@ -52,6 +52,14 @@ startswith (const char *str, const char *pre) return lenstr >= lenpre && memcmp (pre, str, lenpre) == 0; } +static inline bool +endswith (const char *str, const char *suf) +{ + size_t lensuf = strlen (suf); + size_t lenstr = strlen (str); + return lenstr >= lensuf && memcmp (suf, str + lenstr - lensuf, lensuf) == 0; +} + static inline bool is_vdso (const char *str) { @@ -219,7 +227,9 @@ do_test (int argc, char *argv[]) for (size_t i = 0; i < nobjs; i++) { - TEST_COMPARE (objs[i].closed, true); + /* This subtest currently does not pass because of bug 32065. */ + if (! (endswith (objs[i].lname, LD_SO) && objs[i].lmid != LM_ID_BASE)) + TEST_COMPARE (objs[i].closed, true); free (objs[i].lname); } From patchwork Fri Aug 9 21:44:25 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Florian Weimer X-Patchwork-Id: 1971092 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=W4PjLJeN; dkim-atps=neutral Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=sourceware.org (client-ip=2620:52:3:1:0:246e:9693:128c; helo=server2.sourceware.org; envelope-from=libc-alpha-bounces~incoming=patchwork.ozlabs.org@sourceware.org; receiver=patchwork.ozlabs.org) Received: from server2.sourceware.org (server2.sourceware.org [IPv6:2620:52:3:1:0:246e:9693:128c]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (secp384r1) server-digest SHA384) (No client certificate requested) by legolas.ozlabs.org (Postfix) with ESMTPS id 4Wgcrp2r8wz1ybS for ; 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Fri, 09 Aug 2024 17:44:30 -0400 X-MC-Unique: UlbQ3JFoPWGiXzWbgPZT6w-1 Received: from mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.17]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-02.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 537A71955D5D for ; Fri, 9 Aug 2024 21:44:29 +0000 (UTC) Received: from oldenburg.str.redhat.com (unknown [10.2.16.5]) by mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 448DD1955F2C for ; Fri, 9 Aug 2024 21:44:27 +0000 (UTC) From: Florian Weimer To: libc-alpha@sourceware.org Subject: [PATCH 2/3] elf: Call la_objclose for proxy link maps in _dl_fini (bug 32065) In-Reply-To: Message-ID: <987ab81cd241e6dd4d82bcd5ba68f1504ec89d85.1723239322.git.fweimer@redhat.com> References: X-From-Line: 987ab81cd241e6dd4d82bcd5ba68f1504ec89d85 Mon Sep 17 00:00:00 2001 Date: Fri, 09 Aug 2024 23:44:25 +0200 User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.17 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com X-Spam-Status: No, score=-10.8 required=5.0 tests=BAYES_00, DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H4, RCVD_IN_MSPIKE_WL, SPF_HELO_NONE, SPF_NONE, TXREP autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: libc-alpha-bounces~incoming=patchwork.ozlabs.org@sourceware.org --- elf/dl-fini.c | 9 +++++++++ elf/tst-audit23.c | 19 ++++++++++++++++--- 2 files changed, 25 insertions(+), 3 deletions(-) diff --git a/elf/dl-fini.c b/elf/dl-fini.c index db996270de..a1a4c25829 100644 --- a/elf/dl-fini.c +++ b/elf/dl-fini.c @@ -69,6 +69,7 @@ _dl_fini (void) unsigned int i; struct link_map *l; + struct link_map *proxy_link_map = NULL; assert (nloaded != 0 || GL(dl_ns)[ns]._ns_loaded == NULL); for (l = GL(dl_ns)[ns]._ns_loaded, i = 0; l != NULL; l = l->l_next) /* Do not handle ld.so in secondary namespaces. */ @@ -84,6 +85,11 @@ _dl_fini (void) are not dlclose()ed from underneath us. */ ++l->l_direct_opencount; } + else + /* Used below to call la_objclose for the ld.so proxy + link map. */ + proxy_link_map = l; + assert (ns != LM_ID_BASE || i == nloaded); assert (ns == LM_ID_BASE || i == nloaded || i == nloaded - 1); unsigned int nmaps = i; @@ -122,6 +128,9 @@ _dl_fini (void) --l->l_direct_opencount; } + if (proxy_link_map != NULL) + _dl_audit_objclose (proxy_link_map); + #ifdef SHARED _dl_audit_activity_nsid (ns, LA_ACT_CONSISTENT); #endif diff --git a/elf/tst-audit23.c b/elf/tst-audit23.c index 8b3a09a7e1..09318981e3 100644 --- a/elf/tst-audit23.c +++ b/elf/tst-audit23.c @@ -225,13 +225,26 @@ do_test (int argc, char *argv[]) } } + Lmid_t lmid_other = LM_ID_NEWLM; + unsigned int other_namespace_count = 0; for (size_t i = 0; i < nobjs; i++) { - /* This subtest currently does not pass because of bug 32065. */ - if (! (endswith (objs[i].lname, LD_SO) && objs[i].lmid != LM_ID_BASE)) - TEST_COMPARE (objs[i].closed, true); + if (objs[i].lmid != LM_ID_BASE) + { + if (lmid_other == LM_ID_NEWLM) + lmid_other = objs[i].lmid; + TEST_COMPARE (objs[i].lmid, lmid_other); + ++other_namespace_count; + if (!(endswith (objs[i].lname, "/" LIBC_SO) + || endswith (objs[i].lname, "/" LD_SO))) + FAIL ("unexpected object in secondary namespace: %s", + objs[i].lname); + } + TEST_COMPARE (objs[i].closed, true); free (objs[i].lname); } + /* Both libc.so and ld.so should be present. */ + TEST_COMPARE (other_namespace_count, 2); /* la_activity(LA_ACT_CONSISTENT) should be the last callback received. 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Fri, 09 Aug 2024 17:44:46 -0400 X-MC-Unique: mK5WXo1LMYyrmcNkI0jkmg-1 Received: from mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.4]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id AA63F1955F54 for ; Fri, 9 Aug 2024 21:44:45 +0000 (UTC) Received: from oldenburg.str.redhat.com (unknown [10.2.16.5]) by mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 70AB2300018D for ; Fri, 9 Aug 2024 21:44:44 +0000 (UTC) From: Florian Weimer To: libc-alpha@sourceware.org Subject: [PATCH 3/3] elf: Reorder audit events in dlcose to match _dl_fini (bug 32066) In-Reply-To: Message-ID: References: X-From-Line: f1649b1c23b465beb8ca6da49d232fbfdf9edbf4 Mon Sep 17 00:00:00 2001 Date: Fri, 09 Aug 2024 23:44:41 +0200 User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com X-Spam-Status: No, score=-10.8 required=5.0 tests=BAYES_00, DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H3, RCVD_IN_MSPIKE_WL, SPF_HELO_NONE, SPF_NONE, TXREP autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: libc-alpha-bounces~incoming=patchwork.ozlabs.org@sourceware.org This was discovered after extending elf/tst-audit23 to cover dlclose of the dlmopen namespace. Auditors already experience the new order during process shutdown (_dl_fini), so no LAV_CURRENT bump or backwards compatibility code seems necessary. --- elf/dl-close.c | 14 ++++++++------ elf/tst-audit23.c | 40 ++++++++++++++++++++++++++++++---------- 2 files changed, 38 insertions(+), 16 deletions(-) diff --git a/elf/dl-close.c b/elf/dl-close.c index 88226245eb..432a35b141 100644 --- a/elf/dl-close.c +++ b/elf/dl-close.c @@ -264,6 +264,12 @@ _dl_close_worker (struct link_map *map, bool force) _dl_catch_exception (NULL, _dl_call_fini, imap); #ifdef SHARED + /* Auditing checkpoint: we will start deleting objects. + This is supposed to happen before la_objclose (see _dl_fini), + but only once per non-recursive dlclose call. */ + if (!unload_any) + _dl_audit_activity_nsid (nsid, LA_ACT_DELETE); + /* Auditing checkpoint: we remove an object. */ _dl_audit_objclose (imap); #endif @@ -424,12 +430,8 @@ _dl_close_worker (struct link_map *map, bool force) if (!unload_any) goto out; -#ifdef SHARED - /* Auditing checkpoint: we will start deleting objects. */ - _dl_audit_activity_nsid (nsid, LA_ACT_DELETE); -#endif - - /* Notify the debugger we are about to remove some loaded objects. */ + /* Notify the debugger we are about to remove some loaded objects. + LA_ACT_DELETE has already been signalled above for !unload_any. */ struct r_debug *r = _dl_debug_update (nsid); r->r_state = RT_DELETE; _dl_debug_state (); diff --git a/elf/tst-audit23.c b/elf/tst-audit23.c index 09318981e3..ec702b5b30 100644 --- a/elf/tst-audit23.c +++ b/elf/tst-audit23.c @@ -30,16 +30,21 @@ #include #include #include +#include static int restart; +static int do_dlclose; #define CMDLINE_OPTIONS \ - { "restart", no_argument, &restart, 1 }, + { "restart", no_argument, &restart, 1 }, \ + { "dlclose", no_argument, &do_dlclose, 1 }, \ static int handle_restart (void) { xdlopen ("tst-audit23mod.so", RTLD_NOW); - xdlmopen (LM_ID_NEWLM, LIBC_SO, RTLD_NOW); + void *handle = xdlmopen (LM_ID_NEWLM, LIBC_SO, RTLD_NOW); + if (do_dlclose) + xdlclose (handle); return 0; } @@ -67,8 +72,8 @@ is_vdso (const char *str) || startswith (str, "linux-vdso"); } -static int -do_test (int argc, char *argv[]) +static void +do_one_test (int argc, char *argv[], bool pass_dlclose_flag) { /* We must have either: - One or four parameters left if called initially: @@ -76,16 +81,15 @@ do_test (int argc, char *argv[]) + "--library-path" optional + the library path optional + the application name */ - if (restart) - return handle_restart (); - - char *spargv[9]; + char *spargv[10]; TEST_VERIFY_EXIT (((argc - 1) + 3) < array_length (spargv)); int i = 0; for (; i < argc - 1; i++) spargv[i] = argv[i + 1]; spargv[i++] = (char *) "--direct"; spargv[i++] = (char *) "--restart"; + if (pass_dlclose_flag) + spargv[i++] = (char *) "--dlclose"; spargv[i] = NULL; setenv ("LD_AUDIT", "tst-auditmod23.so", 0); @@ -125,6 +129,7 @@ do_test (int argc, char *argv[]) size_t buffer_length = 0; while (xgetline (&buffer, &buffer_length, out)) { + verbose_printf ("info: log line: %s", buffer); if (startswith (buffer, "la_activity: ")) { uintptr_t cookie; @@ -135,8 +140,14 @@ do_test (int argc, char *argv[]) /* The cookie identifies the object at the head of the link map, so we only add a new namespace if it changes from the previous - one. This works since dlmopen is the last in the test body. */ - if (cookie != last_act_cookie && last_act_cookie != -1) + one. This works since dlmopen is the last in the test body. + + Currently, this does not work as expected because there + is no head link map if a namespace is completely deleted. + No LA_ACT_CONSISTENT event is generated in that case. + See the comment in _dl_audit_activity_nsid and bug 32068. */ + if (cookie != last_act_cookie && last_act_cookie != -1 + && !pass_dlclose_flag) TEST_COMPARE (last_act, LA_ACT_CONSISTENT); if (this_act == LA_ACT_ADD && acts[nacts] != cookie) @@ -254,7 +265,16 @@ do_test (int argc, char *argv[]) free (buffer); xfclose (out); +} + +static int +do_test (int argc, char *argv[]) +{ + if (restart) + return handle_restart (); + do_one_test (argc, argv, false); + do_one_test (argc, argv, true); return 0; }