From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from bhuna.collabora.co.uk (bhuna.collabora.co.uk [46.235.227.227]) by sourceware.org (Postfix) with ESMTPS id 0221B385781F for ; Tue, 9 Feb 2021 17:18:49 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org 0221B385781F Received: from noise.lan (unknown [IPv6:2001:4d48:ad5c:ef00:8e70:5aff:fe59:c29c]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: vivek) by bhuna.collabora.co.uk (Postfix) with ESMTPSA id 2F1A51F451DB for ; Tue, 9 Feb 2021 17:18:46 +0000 (GMT) From: =?UTF-8?q?Vivek=20Das=C2=A0Mohapatra?= To: libc-alpha@sourceware.org Subject: [RFC][PATCH v8 07/20] elf/dl-open.c: Don't try libc linit in namespaces with no libc mapping Date: Tue, 9 Feb 2021 17:18:26 +0000 Message-Id: <20210209171839.7911-8-vivek@collabora.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20210209171839.7911-1-vivek@collabora.com> References: <20210209171839.7911-1-vivek@collabora.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=-13.5 required=5.0 tests=BAYES_00, GIT_PATCH_0, KAM_DMARC_STATUS, SPF_HELO_PASS, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 09 Feb 2021 17:18:50 -0000 Secondary namespaces which share their libc mapping with the main namespace cannot (and should not) have _dl_call_libc_early_init called for them by dl_open_worker. --- elf/dl-open.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/elf/dl-open.c b/elf/dl-open.c index 4cb90bfe19..dc4b386559 100644 --- a/elf/dl-open.c +++ b/elf/dl-open.c @@ -792,16 +792,21 @@ dl_open_worker (void *a) namespace. */ if (!args->libc_already_loaded) { + /* If this is a secondary (nsid != LM_ID_BASE) namespace then + it is POSSIBLE there's no libc_map at all - We use the one + shared with LM_ID_BASE instead (which MUST already be + initialised for us to even reach here). */ struct link_map *libc_map = GL(dl_ns)[args->nsid].libc_map; #ifdef SHARED - bool initial = libc_map->l_ns == LM_ID_BASE; + bool initial = libc_map && (libc_map->l_real->l_ns == LM_ID_BASE); #else /* In the static case, there is only one namespace, but it contains a secondary libc (the primary libc is statically linked). */ bool initial = false; #endif - _dl_call_libc_early_init (libc_map, initial); + if (libc_map != NULL) + _dl_call_libc_early_init (libc_map, initial); } #ifndef SHARED -- 2.20.1