From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugzilla@gcc.gnu.org>
Received: by sourceware.org (Postfix, from userid 48)
	id 476153894C1E; Mon,  5 Dec 2022 09:07:25 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 476153894C1E
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1670231245;
	bh=yK4z17I6xHkMLxDGL3Qro+n2vyJB30xz8rRucUt8gj8=;
	h=From:To:Subject:Date:From;
	b=dCSQ3MfKlX4bABf+O0h/G50X/vIxK1P6zDr3bZZnUcanJso8PkdRo/IFxcHIuK3dK
	 IUGEvnRoBg+Uc1BInBRhHNmWASAxSXs3j9Zv/7Y7mLN1VgrGKNE5eGbGRNah/kWA28
	 WMJid9L2j+Cc4SdkbuZQxPnPp+FQJHQihrQI3ggw=
From: "contact@alexander-pick.com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/107971] New: linking an assembler object creates an
 executable stack
Date: Mon, 05 Dec 2022 09:07:24 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: c
X-Bugzilla-Version: unknown
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: contact@alexander-pick.com
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: bug_id short_desc product version bug_status
 bug_severity priority component assigned_to reporter target_milestone
 attachments.created
Message-ID: <bug-107971-4@http.gcc.gnu.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
List-Id: <gcc-bugs.sourceware.org>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107971

            Bug ID: 107971
           Summary: linking an assembler object creates an executable
                    stack
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: contact@alexander-pick.com
  Target Milestone: ---

Created attachment 54011
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D54011&action=3Dedit
simple testcase for the issue

I encountered a strange behavior with gcc and linking an assembler object.
Doing so will create a binary with executable stack. A testcase is attached.

The code will compile a very simple assembler file as an object and link it=
 to
an object compiled from C. The binary will have an executable stack by defa=
ult
which isn't that great from a security point of view. Setting "-z noexecsta=
ck"
as a workaround is the only way to prevent this.

31:   STACK off    0x0000000000000000 vaddr 0x0000000000000000 paddr
0x0000000000000000 align 2**4
32-         filesz 0x0000000000000000 memsz 0x0000000000000000 flags rwx=