netdev - Re: Re: [PATCH] octeontx2-af: Fix use of uninitialized pointer bmap

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] [day] [month] [year] [list]

Date:   Sat, 25 Jul 2020 13:55:09 +0800 (GMT+08:00)
From:   dinghao.liu@....edu.cn
To:     "David Miller" <davem@...emloft.net>
Cc:     kjlu@....edu, sgoutham@...vell.com, lcherian@...vell.com,
        gakula@...vell.com, jerinj@...vell.com, kuba@...nel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: Re: [PATCH] octeontx2-af: Fix use of uninitialized pointer bmap

> From: Dinghao Liu <dinghao.liu@....edu.cn>
> Date: Fri, 24 Jul 2020 16:06:57 +0800
> 
> > If req->ctype does not match any of NIX_AQ_CTYPE_CQ,
> > NIX_AQ_CTYPE_SQ or NIX_AQ_CTYPE_RQ, pointer bmap will remain
> > uninitialized and be accessed in test_bit(), which can lead
> > to kernal crash.
> 
> This can never happen.
> 
> > Fix this by returning an error code if this case is triggered.
> > 
> > Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>
> 
> I strongly dislike changes like this.
> 
> Most callers of nix_lf_hwctx_disable() inside of rvu_nix.c set
> req->ctype to one of the handled values.
> 
> The only other case, rvu_mbox_handler_nix_hwctx_disable(), is a
> completely unused function and should be removed.
> 
> There is no functional problem in this code at all.
> 
> It is not possible show a code path where the stated problem can
> actually occur.

It's clear to me now. Thanks.

Regards,
Dinghao