linux-kernel - Re: [PATCH 5.14 018/334] nbd: add the check to prevent overflow in __nbd

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Message-ID: <CAHk-=whjhJgk7hD-ftUy-8+9cenhMDHqaNKXOyeNVoMxZRD-_A@mail.gmail.com>
Date:   Mon, 13 Sep 2021 16:00:18 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Arnd Bergmann <arnd@...nel.org>,
        Sedat Dilek <sedat.dilek@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Naresh Kamboju <naresh.kamboju@...aro.org>,
        Nathan Chancellor <natechancellor@...il.com>,
        Baokun Li <libaokun1@...wei.com>,
        open list <linux-kernel@...r.kernel.org>,
        linux-stable <stable@...r.kernel.org>,
        Hulk Robot <hulkci@...wei.com>,
        Josef Bacik <josef@...icpanda.com>,
        Jens Axboe <axboe@...nel.dk>, Sasha Levin <sashal@...nel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        lkft-triage@...ts.linaro.org, llvm@...ts.linux.dev,
        Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH 5.14 018/334] nbd: add the check to prevent overflow in __nbd_ioctl()

On Mon, Sep 13, 2021 at 2:15 PM Nick Desaulniers
<ndesaulniers@...gle.com> wrote:
>
> Sorry wrong diff:

Well, this second diff was seriously whitespace-damaged and hard to
read, but while it seems to be the same number of lines, it sure looks
a lot more readable in this format.

Except I think that

                default: dividend / divisor);

should really have parentheses around both of those macro arguments.

That's a preexisting problem, but it should be fixed while at it.

I'm also not sure why that (again, preexisting) BUILD_BUG_ON_MSG()
only checks the size of the dividend, not the divisor. Very strange.
But probably not worth worrying about.

               Linus