linux-kernel - Re: [PATCH v2 2/4] fs/filesystems.c: downgrade user-reachable WARN_ONCE() to pr_warn

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Message-ID: <20200313005831.GR11244@42.do-not-panic.com>
Date:   Fri, 13 Mar 2020 00:58:31 +0000
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     Eric Biggers <ebiggers@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        Alexei Starovoitov <ast@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jeff Vander Stoep <jeffv@...gle.com>,
        Jessica Yu <jeyu@...nel.org>,
        Kees Cook <keescook@...omium.org>, NeilBrown <neilb@...e.com>,
        stable@...r.kernel.org
Subject: Re: [PATCH v2 2/4] fs/filesystems.c: downgrade user-reachable
 WARN_ONCE() to pr_warn_once()

On Thu, Mar 12, 2020 at 01:25:50PM -0700, Eric Biggers wrote:
> From: Eric Biggers <ebiggers@...gle.com>
> 
> After request_module(), nothing is stopping the module from being
> unloaded until someone takes a reference to it via try_get_module().
> 
> The WARN_ONCE() in get_fs_type() is thus user-reachable, via userspace
> running 'rmmod' concurrently.
> 
> Since WARN_ONCE() is for kernel bugs only, not for user-reachable
> situations, downgrade this warning to pr_warn_once().
> 
> Cc: stable@...r.kernel.org
> Cc: Alexei Starovoitov <ast@...nel.org>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: Jeff Vander Stoep <jeffv@...gle.com>
> Cc: Jessica Yu <jeyu@...nel.org>
> Cc: Kees Cook <keescook@...omium.org>
> Cc: Luis Chamberlain <mcgrof@...nel.org>
> Cc: NeilBrown <neilb@...e.com>
> Signed-off-by: Eric Biggers <ebiggers@...gle.com>

Acked-by: Luis Chamberlain <mcgrof@...nel.org>

  Luis