From owner-dev-commits-src-all@freebsd.org Fri Apr 23 11:14:59 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 946755EE20A; Fri, 23 Apr 2021 11:14:59 +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 4FRWsb19zrz4WxF; Fri, 23 Apr 2021 11:14:59 +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 ED4FD40F0; Fri, 23 Apr 2021 11:14:58 +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 13NBEwnQ013054; Fri, 23 Apr 2021 11:14:58 GMT (envelope-from git@gitrepo.freebsd.org) Received: (from git@localhost) by gitrepo.freebsd.org (8.16.1/8.16.1/Submit) id 13NBEw1e013053; Fri, 23 Apr 2021 11:14:58 GMT (envelope-from git) Date: Fri, 23 Apr 2021 11:14:58 GMT Message-Id: <202104231114.13NBEw1e013053@gitrepo.freebsd.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org From: Konstantin Belousov Subject: git: ab349605821f - stable/13 - rtld: allow to use tls_get_addr_slow() from context where rtld_bind_lock is locked 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/stable/13 X-Git-Reftype: branch X-Git-Commit: ab349605821f7e2bfc609ed69faccd068b402cb6 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, 23 Apr 2021 11:14:59 -0000 The branch stable/13 has been updated by kib: URL: https://cgit.FreeBSD.org/src/commit/?id=ab349605821f7e2bfc609ed69faccd068b402cb6 commit ab349605821f7e2bfc609ed69faccd068b402cb6 Author: Konstantin Belousov AuthorDate: 2021-04-06 18:56:58 +0000 Commit: Konstantin Belousov CommitDate: 2021-04-23 11:14:07 +0000 rtld: allow to use tls_get_addr_slow() from context where rtld_bind_lock is locked (cherry picked from commit 89508048424837ffdb32c8444dab02261711f77d) --- libexec/rtld-elf/rtld.c | 18 +++++++++++------- 1 file changed, 11 insertions(+), 7 deletions(-) diff --git a/libexec/rtld-elf/rtld.c b/libexec/rtld-elf/rtld.c index 134c2566b4cd..882aab4d76d8 100644 --- a/libexec/rtld-elf/rtld.c +++ b/libexec/rtld-elf/rtld.c @@ -166,6 +166,7 @@ static int symlook_list(SymLook *, const Objlist *, DoneList *); static int symlook_needed(SymLook *, const Needed_Entry *, DoneList *); static int symlook_obj1_sysv(SymLook *, const Obj_Entry *); static int symlook_obj1_gnu(SymLook *, const Obj_Entry *); +static void *tls_get_addr_slow(Elf_Addr **, int, size_t, bool) __noinline; static void trace_loaded_objects(Obj_Entry *); static void unlink_object(Obj_Entry *); static void unload_object(Obj_Entry *, RtldLockState *lockstate); @@ -4851,9 +4852,8 @@ unref_dag(Obj_Entry *root) /* * Common code for MD __tls_get_addr(). */ -static void *tls_get_addr_slow(Elf_Addr **, int, size_t) __noinline; static void * -tls_get_addr_slow(Elf_Addr **dtvp, int index, size_t offset) +tls_get_addr_slow(Elf_Addr **dtvp, int index, size_t offset, bool locked) { Elf_Addr *newdtv, *dtv; RtldLockState lockstate; @@ -4862,7 +4862,8 @@ tls_get_addr_slow(Elf_Addr **dtvp, int index, size_t offset) dtv = *dtvp; /* Check dtv generation in case new modules have arrived */ if (dtv[0] != tls_dtv_generation) { - wlock_acquire(rtld_bind_lock, &lockstate); + if (!locked) + wlock_acquire(rtld_bind_lock, &lockstate); newdtv = xcalloc(tls_max_index + 2, sizeof(Elf_Addr)); to_copy = dtv[1]; if (to_copy > tls_max_index) @@ -4871,17 +4872,20 @@ tls_get_addr_slow(Elf_Addr **dtvp, int index, size_t offset) newdtv[0] = tls_dtv_generation; newdtv[1] = tls_max_index; free(dtv); - lock_release(rtld_bind_lock, &lockstate); + if (!locked) + lock_release(rtld_bind_lock, &lockstate); dtv = *dtvp = newdtv; } /* Dynamically allocate module TLS if necessary */ if (dtv[index + 1] == 0) { /* Signal safe, wlock will block out signals. */ - wlock_acquire(rtld_bind_lock, &lockstate); + if (!locked) + wlock_acquire(rtld_bind_lock, &lockstate); if (!dtv[index + 1]) dtv[index + 1] = (Elf_Addr)allocate_module_tls(index); - lock_release(rtld_bind_lock, &lockstate); + if (!locked) + lock_release(rtld_bind_lock, &lockstate); } return ((void *)(dtv[index + 1] + offset)); } @@ -4896,7 +4900,7 @@ tls_get_addr_common(Elf_Addr **dtvp, int index, size_t offset) if (__predict_true(dtv[0] == tls_dtv_generation && dtv[index + 1] != 0)) return ((void *)(dtv[index + 1] + offset)); - return (tls_get_addr_slow(dtvp, index, offset)); + return (tls_get_addr_slow(dtvp, index, offset, false)); } #if defined(__aarch64__) || defined(__arm__) || defined(__mips__) || \