linux-kernel - RE: [PATCH 1/2] cifs: remove initialization value

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <fbb39e4354434cb99b6f6731cab2e0c9@AcuMS.aculab.com>
Date:   Wed, 5 Oct 2022 14:13:13 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Enzo Matsumiya' <ematsumiya@...e.de>,
        Muhammad Usama Anjum <usama.anjum@...labora.com>
CC:     Steve French <sfrench@...ba.org>, Paulo Alcantara <pc@....nz>,
        "Ronnie Sahlberg" <lsahlber@...hat.com>,
        Shyam Prasad N <sprasad@...rosoft.com>,
        "Tom Talpey" <tom@...pey.com>,
        "kernel@...labora.com" <kernel@...labora.com>,
        "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>,
        "linux-cifs@...r.kernel.org" <linux-cifs@...r.kernel.org>,
        "samba-technical@...ts.samba.org" <samba-technical@...ts.samba.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 1/2] cifs: remove initialization value

From: Enzo Matsumiya
> Sent: 04 October 2022 15:23
> 
> Hi Usama,
> 
> On 10/04, Muhammad Usama Anjum wrote:
> >Don't initialize the rc as its value is being overwritten before its
> >use.
> 
> Being bitten by an unitialized variable bug as recent as 2 days ago, I'd
> say this is a step backwards from the "best practices" POV.

Depends on your POV.

If you don't initialise locals there is a fair chance that the
compiler will detect buggy code.

If you initialise them you get well defined behaviour - but
the compiler won't find bugs for you.

Mostly the kernel is in the first camp.

	David

-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)