linux-ext4 - Re: [PATCH 000/141] Fix fall-through warnings for Clang

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]

Date:   Fri, 20 Nov 2020 13:02:34 -0600
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Joe Perches <joe@...ches.com>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        linux-kernel@...r.kernel.org
Cc:     alsa-devel@...a-project.org, amd-gfx@...ts.freedesktop.org,
        bridge@...ts.linux-foundation.org, ceph-devel@...r.kernel.org,
        cluster-devel@...hat.com, coreteam@...filter.org,
        devel@...verdev.osuosl.org, dm-devel@...hat.com,
        drbd-dev@...ts.linbit.com, dri-devel@...ts.freedesktop.org,
        GR-everest-linux-l2@...vell.com, GR-Linux-NIC-Dev@...vell.com,
        intel-gfx@...ts.freedesktop.org, intel-wired-lan@...ts.osuosl.org,
        keyrings@...r.kernel.org, linux1394-devel@...ts.sourceforge.net,
        linux-acpi@...r.kernel.org, linux-afs@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org,
        linux-atm-general@...ts.sourceforge.net,
        linux-block@...r.kernel.org, linux-can@...r.kernel.org,
        linux-cifs@...r.kernel.org, linux-crypto@...r.kernel.org,
        linux-decnet-user@...ts.sourceforge.net,
        linux-ext4@...r.kernel.org, linux-fbdev@...r.kernel.org,
        linux-geode@...ts.infradead.org, linux-gpio@...r.kernel.org,
        linux-hams@...r.kernel.org, linux-hwmon@...r.kernel.org,
        linux-i3c@...ts.infradead.org, linux-ide@...r.kernel.org,
        linux-iio@...r.kernel.org, linux-input@...r.kernel.org,
        linux-integrity@...r.kernel.org,
        linux-mediatek@...ts.infradead.org, linux-media@...r.kernel.org,
        linux-mmc@...r.kernel.org, linux-mm@...ck.org,
        linux-mtd@...ts.infradead.org, linux-nfs@...r.kernel.org,
        linux-rdma@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-scsi@...r.kernel.org, linux-sctp@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-usb@...r.kernel.org, linux-watchdog@...r.kernel.org,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        netfilter-devel@...r.kernel.org, nouveau@...ts.freedesktop.org,
        op-tee@...ts.trustedfirmware.org, oss-drivers@...ronome.com,
        patches@...nsource.cirrus.com, rds-devel@....oracle.com,
        reiserfs-devel@...r.kernel.org, samba-technical@...ts.samba.org,
        selinux@...r.kernel.org, target-devel@...r.kernel.org,
        tipc-discussion@...ts.sourceforge.net,
        usb-storage@...ts.one-eyed-alien.net,
        virtualization@...ts.linux-foundation.org,
        wcn36xx@...ts.infradead.org, x86@...nel.org,
        xen-devel@...ts.xenproject.org, linux-hardening@...r.kernel.org,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nathan Chancellor <natechancellor@...il.com>,
        Miguel Ojeda <ojeda@...nel.org>,
        Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH 000/141] Fix fall-through warnings for Clang



On 11/20/20 12:28, Joe Perches wrote:
> On Fri, 2020-11-20 at 12:21 -0600, Gustavo A. R. Silva wrote:
>> Hi all,
>>
>> This series aims to fix almost all remaining fall-through warnings in
>> order to enable -Wimplicit-fallthrough for Clang.
>>
>> In preparation to enable -Wimplicit-fallthrough for Clang, explicitly
>> add multiple break/goto/return/fallthrough statements instead of just
>> letting the code fall through to the next case.
>>
>> Notice that in order to enable -Wimplicit-fallthrough for Clang, this
>> change[1] is meant to be reverted at some point. So, this patch helps
>> to move in that direction.
> 
> This was a bit hard to parse for a second or three.
> 
> Thanks Gustavo.
> 
> How was this change done?

I audited case by case in order to determine the best fit for each
situation. Depending on the surrounding logic, sometimes it makes
more sense a goto or a fallthrough rather than merely a break.

Thanks
--
Gustavo