From owner-dev-commits-src-all@freebsd.org Fri Apr 9 20:47:18 2021 Return-Path: Delivered-To: dev-commits-src-all@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id A378A5BC6C7; Fri, 9 Apr 2021 20:47:18 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4FH9DP75czz4bdK; Fri, 9 Apr 2021 20:47:17 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org (gitrepo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:5]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 6622624B0B; Fri, 9 Apr 2021 20:47:17 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org ([127.0.1.44]) by gitrepo.freebsd.org (8.16.1/8.16.1) with ESMTP id 139KlHJQ071661; Fri, 9 Apr 2021 20:47:17 GMT (envelope-from git@gitrepo.freebsd.org) Received: (from git@localhost) by gitrepo.freebsd.org (8.16.1/8.16.1/Submit) id 139KlHQj071660; Fri, 9 Apr 2021 20:47:17 GMT (envelope-from git) Date: Fri, 9 Apr 2021 20:47:17 GMT Message-Id: <202104092047.139KlHQj071660@gitrepo.freebsd.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org From: Konstantin Belousov Subject: git: 7cb32a0d0343 - main - rtld: avoid recursing on rtld_bind_lock for write MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Git-Committer: kib X-Git-Repository: src X-Git-Refname: refs/heads/main X-Git-Reftype: branch X-Git-Commit: 7cb32a0d03437f881169b1c55cce89cf70ed43dd Auto-Submitted: auto-generated X-BeenThere: dev-commits-src-all@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Commit messages for all branches of the src repository List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 09 Apr 2021 20:47:18 -0000 The branch main has been updated by kib: URL: https://cgit.FreeBSD.org/src/commit/?id=7cb32a0d03437f881169b1c55cce89cf70ed43dd commit 7cb32a0d03437f881169b1c55cce89cf70ed43dd Author: Konstantin Belousov AuthorDate: 2021-04-06 19:02:23 +0000 Commit: Konstantin Belousov CommitDate: 2021-04-09 20:46:24 +0000 rtld: avoid recursing on rtld_bind_lock for write This fixes a regression in d36d6816151705907393889, where the call to __tls_get_address() was performed under rtld_bind_lock write-locked. Instead use tls_get_addr_slow() directly, with locked = true. Reported by: jkim, many others Tested by: jkim, bdragon (powerpc), mhorne (riscv) Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D29623 --- libexec/rtld-elf/rtld-libc/Makefile.inc | 2 ++ libexec/rtld-elf/rtld.c | 8 ++++---- libexec/rtld-elf/rtld.h | 1 + 3 files changed, 7 insertions(+), 4 deletions(-) diff --git a/libexec/rtld-elf/rtld-libc/Makefile.inc b/libexec/rtld-elf/rtld-libc/Makefile.inc index d5f5993e3f16..7ffcb6e41ec7 100644 --- a/libexec/rtld-elf/rtld-libc/Makefile.inc +++ b/libexec/rtld-elf/rtld-libc/Makefile.inc @@ -67,6 +67,8 @@ _libc_other_objects+=syncicache abs _libc_other_objects+=syncicache .endif +_libc_other_objects+=_get_tp + # Extract all the .o files from libc_nossp_pic.a. This ensures that # we don't accidentally pull in the interposing table or similar by linking # directly against libc_nossp_pic.a diff --git a/libexec/rtld-elf/rtld.c b/libexec/rtld-elf/rtld.c index 8c8271abc93e..29ab4e93d4da 100644 --- a/libexec/rtld-elf/rtld.c +++ b/libexec/rtld-elf/rtld.c @@ -3910,16 +3910,16 @@ dlinfo(void *handle, int request, void *p) static void rtld_fill_dl_phdr_info(const Obj_Entry *obj, struct dl_phdr_info *phdr_info) { - tls_index ti; + Elf_Addr **dtvp; phdr_info->dlpi_addr = (Elf_Addr)obj->relocbase; phdr_info->dlpi_name = obj->path; phdr_info->dlpi_phdr = obj->phdr; phdr_info->dlpi_phnum = obj->phsize / sizeof(obj->phdr[0]); phdr_info->dlpi_tls_modid = obj->tlsindex; - ti.ti_module = obj->tlsindex; - ti.ti_offset = 0; - phdr_info->dlpi_tls_data = __tls_get_addr(&ti); + dtvp = _get_tp(); + phdr_info->dlpi_tls_data = (char *)tls_get_addr_slow(dtvp, + obj->tlsindex, 0, true) + TLS_DTV_OFFSET; phdr_info->dlpi_adds = obj_loads; phdr_info->dlpi_subs = obj_loads - obj_count; } diff --git a/libexec/rtld-elf/rtld.h b/libexec/rtld-elf/rtld.h index 85472826a4ec..6a2f62fc6189 100644 --- a/libexec/rtld-elf/rtld.h +++ b/libexec/rtld-elf/rtld.h @@ -401,6 +401,7 @@ bool allocate_tls_offset(Obj_Entry *obj); void free_tls_offset(Obj_Entry *obj); const Ver_Entry *fetch_ventry(const Obj_Entry *obj, unsigned long); int convert_prot(int elfflags); +void *_get_tp(void); /* libc implementation */ /* * MD function declarations.