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 64E0C385E010; Thu, 16 Jun 2022 12:59:02 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 64E0C385E010
From: "dmalcolm at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug analyzer/106000] New: RFE: -fanalyzer should complain about
 definite buffer overflows/underflows
Date: Thu, 16 Jun 2022 12:59:02 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: analyzer
X-Bugzilla-Version: 12.0
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: dmalcolm at gcc dot gnu.org
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: dmalcolm 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 blocked target_milestone
Message-ID: <bug-106000-4@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
X-BeenThere: gcc-bugs@gcc.gnu.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Gcc-bugs mailing list <gcc-bugs.gcc.gnu.org>
List-Unsubscribe: <https://gcc.gnu.org/mailman/options/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=unsubscribe>
List-Archive: <https://gcc.gnu.org/pipermail/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-request@gcc.gnu.org?subject=help>
List-Subscribe: <https://gcc.gnu.org/mailman/listinfo/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=subscribe>
X-List-Received-Date: Thu, 16 Jun 2022 12:59:02 -0000

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106000

            Bug ID: 106000
           Summary: RFE: -fanalyzer should complain about definite buffer
                    overflows/underflows
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: analyzer
          Assignee: dmalcolm at gcc dot gnu.org
          Reporter: dmalcolm at gcc dot gnu.org
            Blocks: 105887
  Target Milestone: ---

I attempted to implement buffer-overflow (and underflow) detection for GCC =
12,
trying to categorize all region accesses as either:
(a) definitely in-bounds
(b) definitely out-of-bounds
(c) possibly out-of-bounds

Unfortunately my implementation led to a "wall of noise" level of warnings =
from
(c).  It now strikes me that we could at least implement warnings for (b) -
where we can see definite problems, and that this might be at least somewhat
useful.

Compare with:
=20
https://clang.llvm.org/docs/analyzer/checkers.html#alpha-security-arrayboun=
d-c
=20
https://clang.llvm.org/docs/analyzer/checkers.html#alpha-security-arrayboun=
dv2-c


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105887
[Bug 105887] [meta-bug] clang analyzer warnings that GCC's -fanalyzer could
implement=