linux-kernel - Re: [PATCH 4/4] file: Fix file descriptor leak in copy_fd

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Message-ID: <CAHk-=wjRwwUywAa9TzQUxhqNrQzZJQZvwn1JSET3h=U+3xi8Pg@mail.gmail.com>
Date:   Tue, 29 Mar 2022 15:18:56 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Fedor Pchelkin <aissur0002@...il.com>
Cc:     Alexey Khoroshilov <khoroshilov@...ras.ru>,
        Eric Biggers <ebiggers@...nel.org>,
        Christian Brauner <brauner@...nel.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/4] file: Fix file descriptor leak in copy_fd_bitmaps()

On Tue, Mar 29, 2022 at 2:02 PM Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> I will apply that ALIGN() thing since Christian could confirm it fixes
> things, and try to add a few more comments about how bitmaps are
> fundamentally in chunks of BITS_PER_LONG.

Ok, applied as commit 1c24a186398f ("fs: fd tables have to be
multiples of BITS_PER_LONG").

I tried to add reasonable commentary too, both to the commit and the
file.c code.

Christian already tested that added ALIGN() for his test-case (that's
obviously assuming the obvious patch was identical - it can go in
multiple places), but the more the merrier, of course.

                 Linus