From owner-freebsd-bugs@freebsd.org Thu Dec 31 16:08:30 2020 Return-Path: Delivered-To: freebsd-bugs@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 93A764C6636 for ; Thu, 31 Dec 2020 16:08:30 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mailman.nyi.freebsd.org (mailman.nyi.freebsd.org [IPv6:2610:1c1:1:606c::50:13]) by mx1.freebsd.org (Postfix) with ESMTP id 4D6CkQ3cR8z3DJL for ; Thu, 31 Dec 2020 16:08:30 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: by mailman.nyi.freebsd.org (Postfix) id 7BFB04C6635; Thu, 31 Dec 2020 16:08:30 +0000 (UTC) Delivered-To: bugs@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 7BC6C4C6634 for ; Thu, 31 Dec 2020 16:08:30 +0000 (UTC) (envelope-from bugzilla-noreply@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 "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4D6CkQ306xz3DSf for ; Thu, 31 Dec 2020 16:08:30 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2610:1c1:1:606c::50:1d]) (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 59E241337C for ; Thu, 31 Dec 2020 16:08:30 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org ([127.0.1.5]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id 0BVG8UPZ044881 for ; Thu, 31 Dec 2020 16:08:30 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id 0BVG8UaQ044880 for bugs@FreeBSD.org; Thu, 31 Dec 2020 16:08:30 GMT (envelope-from bugzilla-noreply@freebsd.org) X-Authentication-Warning: kenobi.freebsd.org: www set sender to bugzilla-noreply@freebsd.org using -f From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 252307] dlopen (without RTLD_GLOBAL) overrides weak symbols in libc Date: Thu, 31 Dec 2020 16:08:30 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: bin X-Bugzilla-Version: 12.2-RELEASE X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Only Me X-Bugzilla-Who: iwtcex@gmail.com X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: bugs@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version rep_platform op_sys bug_status bug_severity priority component assigned_to reporter Message-ID: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: freebsd-bugs@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 31 Dec 2020 16:08:30 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D252307 Bug ID: 252307 Summary: dlopen (without RTLD_GLOBAL) overrides weak symbols in libc Product: Base System Version: 12.2-RELEASE Hardware: Any OS: Any Status: New Severity: Affects Only Me Priority: --- Component: bin Assignee: bugs@FreeBSD.org Reporter: iwtcex@gmail.com See the comment at https://bugs.winehq.org/show_bug.cgi?id=3D50257#c20 for context. % cat weak_sym_override_test.c=20 #include #include #include #include #if SHLIB void* calloc(size_t number, size_t size) { printf("libc called\n"); exit(1); } #else int main() { assert(dlopen("override.so", RTLD_NOW) !=3D NULL); setenv("WHATEVER", "1", 0); // uses calloc internally return 0; } #endif % cc -shared -fPIC -DSHLIB weak_sym_override_test.c -o override.so && cc weak_sym_override_test.c -Wl,-rpath,. -o test % ./test=20 libc called Doesn't happen with LD_BIND_NOW=3D1. No idea how that works on Linux, glibc consistently avoids calling weak symbols it exports, preferring internal versions prefixed with with __ (two underscores) instead, thus there is no obvious way to test it. --=20 You are receiving this mail because: You are the assignee for the bug.=