linux-hardening - Re: [PATCH v2 3/3] wifi: mwifiex: Sanity check tlv_len and tlv_bitmap

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Message-ID: <CA+ASDXNxYZsxFcF2iiKidBr4znsS5ejjmQKU_pdNpsrAqyeXEg@mail.gmail.com>
Date:   Fri, 25 Aug 2023 16:38:56 -0700
From:   Brian Norris <briannorris@...omium.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Kalle Valo <kvalo@...nel.org>,
        Amitkumar Karwar <akarwar@...vell.com>,
        Xinming Hu <huxm@...vell.com>, Dan Williams <dcbw@...hat.com>,
        linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH v2 3/3] wifi: mwifiex: Sanity check tlv_len and tlv_bitmap_len

On Fri, Aug 25, 2023 at 2:10 PM Kees Cook <keescook@...omium.org> wrote:
> On Thu, Aug 24, 2023 at 09:10:45PM -0600, Gustavo A. R. Silva wrote:
> > +                     mwifiex_dbg(priv->adapter, WARN,
> > +                                 "TLV size (%zu) overflows event_buf buf_left=%d\n",
> > +                                 size_add(sizeof(tlv_rxba->header), tlv_len),
> > +                                 tlv_buf_left);
>
> With the suggested change to make this a warning and not dbg:

mwifiex_dbg(..., WARN, ...) *is* a warning, not a debug message. Or at
least, that's how it's used throughout this driver, even though it
actually yields a dev_info()-level message, regardless of the 'mask'
arg:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/net/wireless/marvell/mwifiex/main.c?id=v6.4#n1811