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 AB86B3858C78; Tue, 21 May 2024 10:05:20 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org AB86B3858C78
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1716285920;
	bh=3aUJ7pdnlRaPFDLzbgMDYxQfs6309XjNzSiwVAelpT0=;
	h=From:To:Subject:Date:In-Reply-To:References:From;
	b=in25WSbzzTpzXFOmBQ5uKOAC6u4pFVh7ExWnJCPji9A0b4A44ZoZDQvwRFqnsXvk5
	 KUFyAghndoV9LXrrPw2NZvrkjYyO0FWxjMXllemUWlFCNHB9xsMldcFPGzCS4Xwz9t
	 KHbRBKknJRq1RJ+U3gIGbx1HLaxi6XOV54ewME08=
From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug sanitizer/115172] Invalid -fsanitize=bool sanitization of
 variable from named address space
Date: Tue, 21 May 2024 10:05:20 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: sanitizer
X-Bugzilla-Version: 14.1.1
X-Bugzilla-Keywords: wrong-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: jakub at gcc dot gnu.org
X-Bugzilla-Status: NEW
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_status everconfirmed cf_reconfirmed_on
Message-ID: <bug-115172-4-5uZUhGVLDP@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-115172-4@http.gcc.gnu.org/bugzilla/>
References: <bug-115172-4@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=3D115172

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2024-05-21

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Reduced testcase for -O2 -fsanitize=3Daddress,bool --param
asan-instrumentation-with-call-threshold=3D100:
extern struct S { _Bool b; } s;
void bar (void);

void
foo (void)
{
  if (*(volatile _Bool __seg_gs *) (__UINTPTR_TYPE__) &s.b)
    bar ();
}

What the kernel does is terrible, why they just don't declare the extern wi=
th
__seg_gs attribute?=